EP0323724A2 - A method for stabilizing hydroisomerates - Google Patents
A method for stabilizing hydroisomerates Download PDFInfo
- Publication number
- EP0323724A2 EP0323724A2 EP88311988A EP88311988A EP0323724A2 EP 0323724 A2 EP0323724 A2 EP 0323724A2 EP 88311988 A EP88311988 A EP 88311988A EP 88311988 A EP88311988 A EP 88311988A EP 0323724 A2 EP0323724 A2 EP 0323724A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- catalyst
- oil
- wax
- mild
- alumina
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000000087 stabilizing effect Effects 0.000 title 1
- 239000003054 catalyst Substances 0.000 claims abstract description 111
- 229910052751 metal Inorganic materials 0.000 claims abstract description 35
- 239000002184 metal Substances 0.000 claims abstract description 35
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 22
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 22
- 239000003870 refractory metal Substances 0.000 claims abstract description 22
- 239000012263 liquid product Substances 0.000 claims abstract description 21
- 239000003921 oil Substances 0.000 claims description 65
- 238000006317 isomerization reaction Methods 0.000 claims description 46
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 45
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 45
- 239000007789 gas Substances 0.000 claims description 19
- 229910052697 platinum Inorganic materials 0.000 claims description 18
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 17
- 238000009835 boiling Methods 0.000 claims description 13
- 239000010687 lubricating oil Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims 6
- 229910052763 palladium Inorganic materials 0.000 claims 3
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 238000009877 rendering Methods 0.000 abstract 1
- 239000001993 wax Substances 0.000 description 76
- 239000000463 material Substances 0.000 description 28
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- 239000000047 product Substances 0.000 description 19
- 239000002199 base oil Substances 0.000 description 18
- 239000010802 sludge Substances 0.000 description 17
- 229910052731 fluorine Inorganic materials 0.000 description 15
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 12
- 239000011737 fluorine Substances 0.000 description 12
- 239000000203 mixture Substances 0.000 description 12
- 229910052757 nitrogen Inorganic materials 0.000 description 12
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 11
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 11
- 229910052593 corundum Inorganic materials 0.000 description 11
- 239000001257 hydrogen Substances 0.000 description 11
- 229910052739 hydrogen Inorganic materials 0.000 description 11
- 239000000243 solution Substances 0.000 description 11
- 229910001845 yogo sapphire Inorganic materials 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 10
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- 238000007689 inspection Methods 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 8
- 230000004913 activation Effects 0.000 description 8
- 229940091249 fluoride supplement Drugs 0.000 description 8
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 7
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- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 6
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- 230000000052 comparative effect Effects 0.000 description 5
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- 229960005349 sulfur Drugs 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000010790 dilution Methods 0.000 description 4
- 239000012895 dilution Substances 0.000 description 4
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- 238000005984 hydrogenation reaction Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
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- 229920000742 Cotton Polymers 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
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- 208000036366 Sensation of pressure Diseases 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- LDDQLRUQCUTJBB-UHFFFAOYSA-N ammonium fluoride Chemical compound [NH4+].[F-] LDDQLRUQCUTJBB-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- 238000011088 calibration curve Methods 0.000 description 2
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- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 150000002576 ketones Chemical class 0.000 description 2
- 239000004200 microcrystalline wax Substances 0.000 description 2
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910003158 γ-Al2O3 Inorganic materials 0.000 description 2
- 239000005711 Benzoic acid Substances 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- XZMCDFZZKTWFGF-UHFFFAOYSA-N Cyanamide Chemical compound NC#N XZMCDFZZKTWFGF-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910003638 H2SiF6 Inorganic materials 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 229910017318 Mo—Ni Inorganic materials 0.000 description 1
- 229910003296 Ni-Mo Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
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- 239000002775 capsule Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
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- 150000001875 compounds Chemical class 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
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- 150000002222 fluorine compounds Chemical class 0.000 description 1
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- 238000005658 halogenation reaction Methods 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 238000004255 ion exchange chromatography Methods 0.000 description 1
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- 235000019808 microcrystalline wax Nutrition 0.000 description 1
- 229940114937 microcrystalline wax Drugs 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- DDTIGTPWGISMKL-UHFFFAOYSA-N molybdenum nickel Chemical compound [Ni].[Mo] DDTIGTPWGISMKL-UHFFFAOYSA-N 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- -1 nitrogen containing compounds Chemical class 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000012169 petroleum derived wax Substances 0.000 description 1
- 235000019381 petroleum wax Nutrition 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
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- 238000007655 standard test method Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- ZEFWRWWINDLIIV-UHFFFAOYSA-N tetrafluorosilane;dihydrofluoride Chemical compound F.F.F[Si](F)(F)F ZEFWRWWINDLIIV-UHFFFAOYSA-N 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G65/00—Treatment of hydrocarbon oils by two or more hydrotreatment processes only
- C10G65/02—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only
- C10G65/04—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only including only refining steps
- C10G65/043—Treatment of hydrocarbon oils by two or more hydrotreatment processes only plural serial stages only including only refining steps at least one step being a change in the structural skeleton
Definitions
- the Group VIII metal component is preferably platinum.
- the catalysts of choice are selected from Group VIII on halogenated alumina or material containing alumina support, preferably alumina or material consisting predominantly (i.e.
- alumina catalyst preferively Group VIII on fluorided or chlorinated support, more preferably platinum on fluorided alumina support, most preferably platinum on fluorided ⁇ alumina catalyst.
- platinum on fluorided alumina support most preferably platinum on fluorided ⁇ alumina catalyst.
- These preferred catalysts are preferred hydrosomerization catalyst in which service they are employed under moderate to severe operating conditions.
- Slack wax containing from 0% to 25% oil coming from the dewaxing of conventional petroleum crude oils is subjected to hydrotreating over conventional hydrotreating catalyst so as to reduce the sulfur and nitrogen content levels of the wax.
- This hydrotreating is necessary so as to avoid deactivation of the typical Group VIII on halogenated refractory metal oxide isomerization catalyst.
- other, less sensitive isomerization catalyst, such as combination Group VI-Group VIII metal on refractory metal oxide catalysts are used, since such catalyst are usually sulfided prior to use, the need for prehydrotreating is lessened, if not eliminated.
- the total liquid product of isomerized slack wax from the isomerization unit is then contacted with the Group VIII metal on refractory metal oxide catalyst or Group VIII on halogenated refractory metal oxide catalyst under mild hydrorefining conditions, which step is followed by a subsequent fractionation into various cuts boiling in the different lube basestock boiling ranges, dewaxing and final fractionation. While these steps can be practiced in different sequences it is preferred that the total liquid product from the isomerization unit be subjected to the herein described mild hydrorefining. It was unexpected that the mild hydrorefining can effectively treat this total liquid product since in the past it had been throught necessary to conduct such hydrofinishing procedures on fractions of oils and not on broad cuts of oils.
- fractionated isomerized wax products can be hydrofined it has also been unexpectedly discovered that unfractionated isomerized wax product, the total liquid product from the isomerization unit can be hydrofined under mild conditions to produce a material of improved daylight stability.
- lube oil base stocks or blending stock oils made by the isomerization of slack waxes can have their daylight stability markedly improved by a process comprising contacting the total liquid product from the isomerization unit with a Group VIII metal on refractory metal oxide support catalyst or Group VIB-Group VIII metal on halogenated refractory metal oxide hydroisomerization catalyst under mild conditions.
- This mild condition hydrofinishing is performed at a temperature of about 170°C to 270°C, preferably about 180 to 220°C, a flow velocity of 0.25 to 10 V/V/hr, preferably 1 to 4 V/V/hr, a pressure of from 300 to 1500 psi H2, preferably 500 to 1000 psi H2 and a hydrogen gas rate of 500 to 10,000 SCF/bbl, preferably 1000 to 5000 SCF/bbl.
- Temperatures at the high end of the range should be employed only when similarly employing pressures at the high end of their recited range. Temperatures in excess of those recited may be employed if pressures in excess of 1500 psi are used, but such pressures may not be practical or economic.
- any necessary hydrotreating of the slack wax feed is performed employing commercial catalyst, such as Co/Mo-Ni/Mo on alumina, under standard commercially accepted conditions, e.g., temperature of 320°C to 400°C, space velocity of 0.1 to 2.0 v/v/hr, pressure of from 500 to 3000 psig H2, and gas rates of from 500 to 5000 SCF/B.
- commercial catalyst such as Co/Mo-Ni/Mo on alumina
- Isomerization is conducted over a catalyst containing a hydrogenating metal component typically one from Group VI or Group VIII or mixture thereof, preferably Group VIII, more preferably noble Group VIII most preferably platinum on a halogenated refractory metal oxide support.
- the catalyst typically contains from 0.1-5.0 wt.% metal, preferably 0.1 to 1.0 wt.% metal, most preferably 0.2-0.6 wt.% metal.
- the refractory metal oxide support is typically a transition e.g. gamma or eta alumina and the halogen is most usually fluorine. Isomerization is accomplished under moderate to high temperature conditions of 270°C to 400°C, preferably 300°C to 360°C.
- Space velocity ranges from 0.10 to 10 v/v/hr, preferably 1.0 to 2.0 v/v/hr. Pressure ranges from 500 to 3000 psi H2, preferably 1000 to 1500 psi H2. Hydrogen gas rate ranges from 1000 to 10,000 SCF/B. Moderate levels of conversion of wax to isomerate are preferred. Conversions to a level such that about 40% or less unconverted wax remains in the 370°C+ fraction sent to the dewaxer, preferably 15-35% unconverted wax remains in the 370°C+ fraction sent to the dewaxer are preferred.
- the prehydrotreating step can be dispensed with, but the isomerized wax product would still have to be freed of H2S and NH3 prior to being contacted with the second stage catalyst. This could be done by flashing or stripping of the product to remove H2S and NH3.
- a preferred catalyst for use in the present process contains a hydrogenation metal component which is a Group VIII noble metal or mixture thereof, preferably noble Group VIII metal, most preferably platinum on a fluorided alumina or material containing alumina, preferably alumina or material consisting predominantly (i.e.
- XRD X-ray diffraction
- the fluoride content of the catalyst can be determined in a number of ways.
- Fluoride concentration of the sample is determined by ion chromatography analysis of the combustion product solution. Calibration curves are prepared by combusting several concentrations of ethanolic KF standards (in the same manner as the sample) to obtain a 0-10 ppm calibration range. Fluoride concentration of the catalyst is calculated on an ignition-loss-free-basis by comparison of the sample solution response to that of the calibration curve. Ignition loss is determined on a separate sample heated to 800 degrees F for at least 2 hours. Ion chromatographic analysis uses standard anion conditions.
- Fluoride distillation with a titrimetric finish. Fluorides are converted into fluorosilicic acid (H2SiF6) by reaction with quartz in phosphoric acid medium, and distilled as such using super heated steam. This is the Willard-Winter-Tananaev distillation. It should be noted that the use of super heated, dry (rather than wet) steam is crucial in obtaining accurate results. Using a wet steam generator yielded results 10-20% lower. The collected fluorosilicic acid is titrated with standardized sodium hydroxide solution. A correction has to be made for the phosphoric acid which is also transferred by the steam. Fluoride data are reported on an ignition-loss-free-basis after determination of ignition loss on a sample heated to 400 degree C for 1 hour.
- Another preferred catalyst is a catalyst prepared by a process involving depositing a hydrogenation metal on an alumina or material containing alumina support, calcining said metal loaded support typically at between 350 to 500°C, preferably about 450 to 500°C for about 1 to 5 hours, preferably about 1 to 3 hours and fluoriding said metal loaded support using a high pH fluorine source solution to a bulk fluorine level of about 8 wt% or less (e.g., 2 to 8 wt%), preferably about 7 wt% or less, said high pH source solution being at a pH of 3.5 to 4.5 and preferably being a mixture of NH4H and HF followed by rapid drying/heating in a thin bed or rotary kiln to insure thorough heating in air, an oxygen containing atmosphere or an inert atmosphere to a temperature between about 350 to 450°C in about 3 hours or less, preferably 375 to 400°C, and holding at the final temperature, if necessary, for a time sufficient to reduce
- a low pH fluorine source solution having a pH of less than 3.5 using aqueous solutions of HF or appropriate mixtures of HF and NH4F to a bulk fluorine level of about 10 wt% or less (e.g., 2 to 10 wt%), preferably about 8 wt% or less followed by drying/heating in a thin bed or rotary kiln to a temperature of about 350 to 450°C, preferably 375 to 425°C in air an oxygen containing atmosphere, or an inert atmosphere and holding for 1 to 5 hours.
- aqueous solutions of HF or appropriate mixtures of HF and NH4F to a bulk fluorine level of about 10 wt% or less (e.g., 2 to 10 wt%), preferably about 8 wt% or less
- drying/heating in a thin bed or rotary kiln to a temperature of about 350 to 450°C, preferably 375 to 425°C in
- the alumina or alumina containing support material is preferably in the form of extrudates, and are preferably at least about 1/32 inch across the longest cross-sectional dimension. If the low pH prepared catalyst is first charged to a unit, the catalyst must be held at the final activation temperature for longer than 5 hours, preferably longer than 10 hours and preferably at temperatures of 400 to 450°C.
- the above catalysts typically contain from 0.1 to 5.0 wt% metal, preferably 0.1 to 1.0 wt% metal, most preferably 0.2 to 0.6 wt% metal.
- the dried/heated catalyst has a surface nitrogen content N/Al of 0.01 or less by X-ray photoelectron spectroscopy (XPS, preferably an N/Al of 0.007 or less, most preferably an N/Al of 0.004 or less by XPS.
- XPS X-ray photoelectron spectroscopy
- the catalyst following the above recited heating step can be charged to the isomerization reactor and brought quickly up to operating conditions.
- the catalyst prepared using the pH 3.5 to 4.5 solution technique can be activated, preferably in pure or plant hydrogen (60 to 70% H2) at 350 to 450°C, care being taken to employ short activation times, from 1 to 24 hours, preferably 2 to 10 hours being sufficient. Long activation times (in excess of 24 hours) have been found to be detrimental to catalyst performance.
- catalysts made using solutions of pH less than 3.5 can be activated in pure or plant hydrogen at 350 to 500°C for from 1 to 48 hours or longer.
- catalyst prepared using solutions of pH less than 3.5 are not heated first, then it is preferred that they be subsequently activated at more severe conditions, i.e. for longer times and/or at higher temperatures. On the other hand, if they are heated first, then moderate activation condition procedures similar to those employed with catalysts made from higher pH solution techniques will suffice.
- a typical activation profile shows a profile of 2 hours to go from room temperature with 100°C with the catalyst being held at 100°C for 0 to 2 hours then the temperature is raised from 100 to about 350 over a period of 1 to 3 hours with a hold at the final temperature of from 1 to 4 hours.
- the catalyst can be activated by heating from room temperature to the final temperature of 350 to 450°C over a period of 2 to 7 hours with a hold at the final temperature of 0 to 4 hours. Similar activation can be accomplished by going from room temperature to the final temperature of 350 to 450°C in 1 hour.
- Another preferred catalyst comprises a hydrogenating metal on fluorided alumina or material containing alumina support made by depositing the hydrogenation metal on the support and fluoriding said metal loaded support using acidic fluorine sources such as HF by any convenient technique such as spraying, soaking, incipient wetness, etc. to deposit between 2-10% F preferably 2-8%F.
- acidic fluorine sources such as HF
- the catalyst is dried, typically at 120°C and then crushed to expose inner surfaces, the crushed catalyst is double sieved to remove fines and uncrushed particles.
- This sized catalyst is 1/32 inch or less and typically from 1/64 to 1/32 inch in size across its largest cross-sectional dimension.
- the starting particle or extrudate may be of any physical configuration. Thus, particles such as cylinders, trilobes or quadrilobes may be used. Extrudates of any diameter may be utilized and can be anywhere from 1/32 of an inch to many inches in length, the length dimension being set solely by handling considerations. It is preferred that following sizing the particle have a length smaller than the initial extrudate diameter.
- the particle or extrudate is crushed or fractured to expose inner surfaces.
- metal loaded support particle which is already about 1/32 inch in size or smaller and fluoride it as described above using HF.
- the sized material will range in size between about 1/64 to 1/32 inch in size.
- the uncalcined catalyst is activated in a hydrogen atmosphere such as pure hydrogen or plant hydrogen containing 60 to 70 vol% H2 by heating to 350 to 500°C, preferably to 350 to 450°C for from 1 to 48 hours or longer.
- a hydrogen atmosphere such as pure hydrogen or plant hydrogen containing 60 to 70 vol% H2 by heating to 350 to 500°C, preferably to 350 to 450°C for from 1 to 48 hours or longer.
- the hydrogen activation profiles previously described may be used here.
- This sized catalyst is unexpectedly superior for wax isomerization as compared to the uncrushed particle or extrudate starting material. It has also been discovered that 370°C+ oil products made using the sized catalyst as compared to the uncrushed or extrudate material starting with wax possessing about 5 to 10% oil exhibit higher VI's than do 370+ oil products made starting with wax possessing 0% oil (on the one hand) and about 20% oil (on the other). Therefore, to produce products having the highest VI one would isomerize wax having from 5 to 15% oil, preferably 7 to 10% oil using the "sized" catalyst produced using HF.
- One desiring to maximize the production of lube oil having a viscosity in the 5.6 to 5.9 cSt/100°C range should practice the isomerization process under low hydrogen treat gas rate conditions, treat gas rates on the order or 500 to 5000 SCF/bbl, H2, preferably 2000 to 4000 SCF/bbl, H2, most preferively about 2000 to 3000 SCF/bbl, H2.
- the isomerized max material is then subjected to second stage catalyst using a Group VIII metal on refractory metal oxide catalyst or Group VIII metal on halogenated refractory metal oxide catalyst.
- the halogenated catalyst can be the same or different than the Group VIII metal on halogenated refractory metal oxide catalyst used in the prior isomerization reactor.
- the process can be run in blocked sequence,, the reactor first used to produce isomerate by being run at severe conditions with the isomerate going to tankage, the stored isomerate being subsequent recycled through the unit now run under mild conditions to remove trace quantities of polynuclear aromatics and other constituents deterimental to daylight and oxidation stability, but which conditions are not sufficient to effect further isomerization of the hydrocarbon components.
- This second stage zone is run at a temperature of about 170°C to 270°C, preferably 180°C to 220°C, a flow velocity of 0.25 to 10 v/v/hr, preferably 1 to 4 v/v/hr, a pressure of from 300 to 1500 psi H2, preferively 500 to 1000 psi H2, and a hydrogen gas rate of 500 to 10,000 SCF/B, preferably 1000 to 5000 SCF/B. Higher temperatures may be employed if pressures in excess of 1500 psi are used, but such high pressures may not be practical.
- the isomerate is fractionated into a lubes cut and fuels cut, the lubes cut being identified as that fraction boiling in the 330°C+ range, preferably the 370°C+ range and even higher.
- This lubes fraction is then dewaxed to a pour point of about -21°C or lower. Dewaxing is accomplished by techniques which permit the recovery of unconverted wax, since in the process of the present invention this unconverted wax is recycled to the isomerization unit. It is preferred that this recycle wax be recycled to the main wax reservoir and be passed through the hydrotreating unit to remove any quantities of entrained dewaxing solvent which solvent could be detrimental to the isomerization catalyst.
- Solvent dewaxing is utilized and employs typical dewaxing solvents.
- Solvent dewaxing utilizes typical dewaxing solvents such as C3-C6 ketones (e.g. methyl ethyl ketone, methyl isobutyl ketone and mixtures thereof), C6-C10 aromatic hydrocarbons (e.g. toluene), mixtures of ketones and aromatics (e.g.
- MEK/toluene autorefrigerative solvents such as liquefied, normally gaseous C2-C4 hydrocarbons such as propane, propylene, butane, butylene and mixtures thereof, etc. at filter temperature of -25 to -30°C.
- the preferred solvent to dewax the isomerate, especially isomerates derived from heavier waxes (e.g. Bright Stock Waxes) under miscible conditions and thereby produce the highest yield of dewaxed oil at a high filter rate is a mixture of MEK/MIBK (20/80 v/v) used at a temperature in the range -25 to -30°C.
- the fractionation bottoms are recycled by being sent first to the fresh feed reservoir and combined with the wax therein.
- the isomerate from the second stage catalyst zone can be fractionated into narrow cuts and each cut individually dewaxed.
- Figures 1 and 2 present schematic representations of preferred embodiments of the wax isomerization process.
- slack wax feed derived from for example a lighter oil such as 600N oil or lighter is fed from the reservoir (1) to a hydrotreater (3) via line 2 wherein heteroatom compounds are removed from the wax.
- This hydrogenated slack wax is then fed via line 4 to the isomerization unit (5) after which the total liquid product is fed first via lines 6 and 6A to a low temperature, mild condition second stage treating unit (unit 7) wherein the TLP is contacted with the isomerization catalyst or simply a noble Group VIII metal on aluminum catalyst to produce a stream which is then sent via line 6B to the fractionator tower (unit 8).
- the tube stream boiling in the 370°C+ range is then forwarded via line 9 to the solvent dewaxer (unit 10) for the separation of waxy constituents therefrom, the dewaxed oil fraction being recovered via line 11 and forwarded to other conventional treatment processes normally employed on base stock or blending stock oils.
- the recovered wax is recycled either directly to the slack wax stream being fed to the isomerization unit or it is recycled to the wax reservoir (1) via line 12B for passage through the hydrotreater prior to being recycled to the isomerization unit.
- Figure 2 the wax processing stream is much like that of Figure 1, the main difference being that Figure 2 represents the scheme for handling heavier slack wax feeds, such as a wax feed derived from Bright Stock oil
- the wax from reservoir 1 is fed via line 2 to the hydrotreater (3) prior to being sent via line 4 to the isomerization unit (unit 5) after which it is fed via lines 6 and 6A to a low temperature mild condition second stage treating unit (unit 7) wherein it is contacted with a further charge of isomerization catalyst or simply noble Group VIII metal on alumina and fed via line 6B to the fractionator tower (unit 8).
- the isomerate made using the heavy wax is fractionated into a light fraction boiling in the 370°C- (a fuels cut) a lube cut boiling in the 370°C+ range and bottoms fraction boiling in the 580°C+ range.
- the lube fraction, a broad cut boiling in the 370°C to 580°C range is sent via line 9 to the dewaxer (unit 10) as previously described.
- the 580°C+ bottoms fraction contains appreciable wax and is recycled via lines 13, 13A, 13B and 4 to the isomerization unit (5).
- This bottoms fraction optionally can be combined via lines 13 and 13C with the wax in line 12 recovered from the dewaxing unit (10) in which case the total recycled stream can be fed directly to the isomerization unit via lines 12A, 13B and 4 or it can be sent to the wax reservoir (1) via line 12B for treatment of the hydrotreater prior to being fed to the isomerization unit.
- the total liquid product (TLP) from the isomerization unit can be advantageously treated in a second stage at mild conditions using the isomerization catalyst or simply noble Group VIII on refractory metal oxide catalyst to reduce PNA and other contaminants in the isomerate and thus yield an oil or improved daylight stability.
- the total isomerate is passed over a charge of the isomerization catalyst or over just noble Gp VIII on e.g. transition alumina.
- Mild conditions are used, e.g. a temperature in the range of about 170-270°C, preferably about 180 to 220°C, at pressures of about 300 to 1500 psi H2, preferably 500 to 1000 psi H2, a hydrogen gas rate in the range of from about 500 to 10,000 SCF/bbl, preferably 1000 to 5000 SCF/bbl and a flow velocity of about 0.25 to 10 v/v/hr., preferably about 1-4 v/v/hr.
- Temperatures at the high end of the range should be employed only when similarly employing pressures at the high end of their recited range. Temperatures in excess of those recited may be employed if pressures in excess of 1500 psi are used, but such high pressures may not be practical or economic.
- the total isomerate can be treated under these mild conditions in a separate, dedicated unit or the TLP from the isomerization reactor can be stored in tankage and subsequently passed through the aforementioned isomerization reactor under said mild conditions. It has been found to be unnecessary to fractionate the 1st stage product prior to this mild 2nd hold at 100°C for one hour; heat from 100°C to 400°C in three hours, hold at 450°C for four hours.
- Platinum on fluorided ⁇ -alumina made by soaking a commercially available Pt/ ⁇ -Al2O3 base (Catalyst A) in NH4F/HF solution made up to a pH of about 4. The soaked material was washed, then dried then heated for two hours at 400°C in air. The catalyst was analyzed and had a bulk fluorine content of 6.9 wt%, platinum content of 0.62 wt%, surface N/Al ratio (by XPS) of 0.0040.
- This catalyst was activated by heating to 350°C in H2 at 50 psi in the following manner; room temperature to 100°C in two hours, hold at 100°C for one hour; heat from 100°C to 350°C in two hours, hold at 350°C for one hour.
- Platinum on fluorided ⁇ -alumina made by soaking a commercially available Pt/ ⁇ -Al2O3 base (Catalyst A) in 10% HF. The soaked material was washed and dried at 150°C in air. The catalyst was analyzed and had a bulk fluorine content of 8.0%, platinum content of 0.62 wt%. The catalyst was activated by heating to 400°C in H2 at 300 psi in the following manner; room temperature to 100°C at 35°C per hour, hold at 100°C for 6 hours, heat from 100°C to 250°C at 10°C per hour, hold at 250°C for 12 hours; heat to 400°C at 10°C per hour; hold at 400°C for 3 hours.
- platinum on ⁇ -alumina comprising 0.5% Pt on ⁇ -alumina from which halogen had been removed and activated by heating in 40 psi H2 as follows: room temperature to 100°C in 2 hours, hold at 100°C for 1 hour; heat to 350°C over 2 hours, hold at 350°C for 1 hour.
- raw slack waxes from the dewaxing of petroleum oils were hydrotreated to remove polar materials, as well as heteroatomic compounds (sulfur and nitrogen containing compounds) which would deactivate the platinum on fluorided alumina hydroisomerization catalysts.
- Any conventional hydrotreating catalyst can be used, e.g., Cyanamid's HDN-30; Katalco's NM-506; Ketjen's KF-840; etc.
- the prime processing targets for the hydrotreated material are a sulphur content of about 10 ppm or less and a nitrogen content of 1 ppm or less.
- Ketjen KF-840 was used in the form of 1/20 inch quadrilobes.
- the catalyst as received from the manufacturer, had 4% NiO and 19.5% MoO3 on an alumina base, and had a surface area of 180 m2/gram, with an average pore volume of 0.35 cc/g, and an average pore radius of 38 ⁇ . Twelve liters of this catalyst was packed into a tubular fixed bed 189 cm long and 9.9 cm in diameter and sulfided by exposure to H2S in hydrogen and a sulfur containing vacuum distillate.
- the hydrotreating unit can be run in either up flow or down flow mode. Two different slack waxes were hydrotreated, a Western Canadian 600N slack wax, and an Augusta Bright Stock slack wax. Typical properties of each feed are given below in Table 1.
- the 600N slack wax was hydrotreated in an up-flow mode at 0.5 v/v/hr, 1000 psig hydrogen pressure and a gas treat rate of 1500 SCF H2/B.
- reaction temperature was held at 320°C and thereafter at 330°C.
- the slack wax sulphur contents ranged from about 0.073 weight percent to 0.113 weight percent and nitrogen content ranged from 12 to 17 wppm.
- Periodic analysis of the hydrotreated wax showed that sulphur contents were consistently 4 wppm and lower, while nitrogen contents were always 2 wppm or less.
- the Bright Stock slack waxes feeds having different oil contents were hydrotreated in an up-flow mode at 380°C, 1000 psig hydrogen pressure and 1500 SCFH2/B treat gas rate.
- the space velocity was varied from 0.42 to 0.5, in order to obtain the desired sulfur and nitrogen reduction. Inspections of the hydrotreated wax feeds used in the examples are given below in Table 2.
- the hydrotreated Bright Stock slack wax (B) was isomerized at 320°C, 0.89 v/v/hr space velocity, 1000 psi (H2) pressure and 5000 SCF/bbl, H2, gas rate over a 200 cc charge of Catalyst B.
- the hydroconversion was conducted upflow mode and operated at a mass velocity was 160 pounds per hour/square foot (i.e. low mass velocity).
- TLP isomerate total liquid product
- Base oils were prepared from the total liquid product coming from the isomerization zone by fractionating said TLP into various lube fractions and dewaxing said lube fraction to a pour point of -21°C.
- daylight stability was determined on the products from 1 through 5 (above) by exposing 5 ml samples in the presence of air continuously in a light box apparatus in which the lamp used was an Excella fluorescent tube from Sunburst Electric which simulated the intensity and frequency range of actual solar radiation. Samples were rated daily on the degree of haze, floc and sludge formation as to time exposed to air and radiation.
- the dewaxed base stock oils above 1-5 were evaluated for daylight stability and found to exhibit the following: TABLE 3 Dewaxed Base Oil # Daylight Stability 1 Light haze, 48 hrs; distinct haze 96 hrs. 2 Haze/sludge ⁇ 24 hours 3 Haze/sludge ⁇ 24 hours 4 Haze/sludge ⁇ 24 hours 5 Haze/sludge ⁇ 24 hours It is seen that none of these dewaxed isomerate base oil products exhibit acceptable daylight stability since conventional lube base oils normally have daylight stability in excess of 10 days.
- Base oils 3 and 4 were hydrofinished over sulfided KF-840 (Ni-Mo/Al2O3) at 300°C at 500 psi, 500 SCF H2/bbl and 1 v/v/hr. These hydrofinished base oils were evaluated for daylight stability and found to exhibit the following somewhat improved but still unacceptable daylight stabilities: TABLE 4 KF-840 Hydrofined Dewaxed Base Oil Daylight Stability 3 Haze/sludge, 50 hours 4 Haze/sludge, 100 hours
- Dewaxed base oils 3, 4 and 5 were hydrofinished over Pt/F-Al2O3 Catalyst B under a number of conditions (recited in Table 4).
- the hydrofinished base oils were evaluated for daylight stability and found to exhibit the following: TABLE 5 Dewaxed Base Oil Feed 3 4* 5 Catalyst B B B Hydrofinishing Conditions Temperature °C 160 180 200 200 225 200 Pressure, psi H2 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 1000 Space Vel
- the hydrofinished material was fractionated to obtain the 370°C+ fraction for subsequent dewaxing to -21°C pour using 100% MIBK solvent at a 4/1 solvent to oil dilution ratio and -26°C filter temperature. This dewaxed oil fraction was evaluated for daylight stability.
- the 600N slack wax isomerate (TLP), feed D and Bright Stock slack wax isomerate (TLP) feed B were hydrofinished over Pt/alumina, catalyst E (previously described), under the conditions recited below.
- the hydrofinished materials were fractioned into 370°C+ fraction and dewaxed to -20°C pour as recited in Example 4.
- the dewaxed fraction were evaluated for daylight stability (Table 7).
- the hydrofinished isomerate was functioned to obtain the 370°C+ fraction for solvent dewaxing to -21°C pour using 100% MIBK solvent at 4/1 solvent to oil dilution ratio and -26° filter temperatures to dewax as recited in Example 4.
- the dewaxed fraction was evaluated for daylight stability (Table 8).
- the hydrofinished isomerate was fractioned to obtain the 370°C+ fraction for segment dewaxing to -21°C pour using 100% MIBK solvent at 4/1 solvent to oil dilution ratio and -26°C filter temperature to dewax as recited in Example 4.
- the dewaxed fraction was evaluated for daylight stability (Table 9).
- Bright Stock slack wax isomerate (TLP), feed (a) was hydrofinished over Pt/F-Al2O3, Catalyst B, conditions recited below.
- the unhydrofinished TLP and the hydrofinished materials were vacuum distilled to product 460 to 550°C fractions, then dewaxed. These fractions were dewaxed with 5% toluene/95% MIBK at a solvent oil ratio of 4:1 and a filter temperature of -27°C. Each dewaxed fraction was then evaluated for daylight stability.
- the hydrofinished materials were vacuum distilled to produce heart-cut fractions boiling in the 370°C to 580°C range. These fractions were dewaxed with 100% MIBK using a solvent:oil ratio of 4:1 and a filter temperature of -30°C.
- the dewaxed heart-cut fractions were then further fractionated into light (4.5 cSt) and heavy (8.4 cSt) dewaxed oil fractions as shown in Table 11 and evaluated for daylight stability.
- hydrofinishing the total liquid products coming from the isomerization unit using the Group VIII metal on refractory metal oxide or Group VIII metal on halogenated refractory metal oxide catalyst produced dewaxed base oils which exhibit superior daylight stability as compared to the unhydrofinished dewaxed base oils and dewaxed base oil hydrofinished using conventional hydrofinishing catalyst.
- the examples shows that hydrofinishing must be performed within a narrow window of temperature conditions, i.e. about 170-270°C, preferively 180-220°C when operating under consistent mild pressure, treat gas rate and flow velocity conditions.
- a hydrocracked lube basestock was prepared as follows:
- the lube distillate was solvent dewaxed using a 40/60 mixture of MEK/MIBK, solvent to oil ratio of 2/1, and a filter temperature of -22°C.
- the resulting dewaxed oil had the following properties: Viscosity at 40°C cSt 13.44 Viscosity Index 109 Saturates, Wt.% 96.0
- This basestock has excellent viscometric properties.
- a sample of this basestock was hydrofinished over a conventional sulphided Ni/Mo on Al2O3 catalyst (KF-840) at 300°C, 2.0 LHSV, 350 psi H2, 500 SCF/B, H2, treat gas rate.
- a similar sample of fractionated hydrocrackate was hydrofinished according to the invention over a Pt/F/Al2O3 catalyst (Catalyst B) at 200°C, 1.0 LHSV, 1000 psi H2 and 5000 SCF/bbl treat gas rate.
- a 5 ml vial was three-quarters filled with sample, loosely plugged with cotton wool, exposed to daylight in a north-facing window, and checked daily when possible for appearance.
- oil samples (again in a 5 ml vial plugged with cotton wool) were exposed continuously in a light box apparatus in which the lamp used Excella fluorescent tube from Sunburst Electric) simulates the intensity and frequency range of actual radiation. Samples were rated daily in terms of time to haze, floc and sludge.
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Abstract
Description
- Oils in the lube boiling range produced by the hydroisomerization of waxes which oils are suitable for use as lube oil base stocks or blending stocks exhibit unacceptable levels of daylight stability and oxidation stability. It has been discovered that such oils can have their daylight and oxidation stability significantly improved by treating such oils under mild conditions over catalyst comprising Group VIII on supports or Group VIII on halogenated supports. The Group VIII metal component is preferably platinum. The catalysts of choice are selected from Group VIII on halogenated alumina or material containing alumina support, preferably alumina or material consisting predominantly (i.e. >50%) of alumina catalyst, preferably Group VIII on fluorided or chlorinated support, more preferably platinum on fluorided alumina support, most preferably platinum on fluorided γ alumina catalyst. These preferred catalysts are preferred hydrosomerization catalyst in which service they are employed under moderate to severe operating conditions.
- Slack wax containing from 0% to 25% oil coming from the dewaxing of conventional petroleum crude oils is subjected to hydrotreating over conventional hydrotreating catalyst so as to reduce the sulfur and nitrogen content levels of the wax. This hydrotreating is necessary so as to avoid deactivation of the typical Group VIII on halogenated refractory metal oxide isomerization catalyst. If other, less sensitive isomerization catalyst, such as combination Group VI-Group VIII metal on refractory metal oxide catalysts are used, since such catalyst are usually sulfided prior to use, the need for prehydrotreating is lessened, if not eliminated. In such an instance, however, the feed from an isomerization unit utilizing such a catalyst would have to be treated to remove sulfur and/or nitrogen prior to being contacted with the Group VIII metal on refractory metal oxide or Group VIII metal on halogenated refractory metal oxide catalyst used in the present invention in the mild hydrorefining step following isomerization.
- The total liquid product of isomerized slack wax from the isomerization unit is then contacted with the Group VIII metal on refractory metal oxide catalyst or Group VIII on halogenated refractory metal oxide catalyst under mild hydrorefining conditions, which step is followed by a subsequent fractionation into various cuts boiling in the different lube basestock boiling ranges, dewaxing and final fractionation. While these steps can be practiced in different sequences it is preferred that the total liquid product from the isomerization unit be subjected to the herein described mild hydrorefining. It was unexpected that the mild hydrorefining can effectively treat this total liquid product since in the past it had been throught necessary to conduct such hydrofinishing procedures on fractions of oils and not on broad cuts of oils.
- While it has been found that fractionated isomerized wax products can be hydrofined it has also been unexpectedly discovered that unfractionated isomerized wax product, the total liquid product from the isomerization unit can be hydrofined under mild conditions to produce a material of improved daylight stability.
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- Figure 1 is a schematic of an overall wax isomerization process utilizing a light slack wax feed and including the mild condition second stage hydro-treating of the present invention.
- Figure 2 is a schematic of an overall wax isomerization process utilizing a heavy micro crystalline wax feed, including fractionator bottoms recycle and employing the mild condition second stage hydrotreating of the present invention.
- In the present invention it has been discovered that lube oil base stocks or blending stock oils made by the isomerization of slack waxes can have their daylight stability markedly improved by a process comprising contacting the total liquid product from the isomerization unit with a Group VIII metal on refractory metal oxide support catalyst or Group VIB-Group VIII metal on halogenated refractory metal oxide hydroisomerization catalyst under mild conditions. This mild condition hydrofinishing is performed at a temperature of about 170°C to 270°C, preferably about 180 to 220°C, a flow velocity of 0.25 to 10 V/V/hr, preferably 1 to 4 V/V/hr, a pressure of from 300 to 1500 psi H₂, preferably 500 to 1000 psi H₂ and a hydrogen gas rate of 500 to 10,000 SCF/bbl, preferably 1000 to 5000 SCF/bbl. Temperatures at the high end of the range should be employed only when similarly employing pressures at the high end of their recited range. Temperatures in excess of those recited may be employed if pressures in excess of 1500 psi are used, but such pressures may not be practical or economic.
- In conjunction with the isomerization step any necessary hydrotreating of the slack wax feed is performed employing commercial catalyst, such as Co/Mo-Ni/Mo on alumina, under standard commercially accepted conditions, e.g., temperature of 320°C to 400°C, space velocity of 0.1 to 2.0 v/v/hr, pressure of from 500 to 3000 psig H₂, and gas rates of from 500 to 5000 SCF/B.
- Isomerization is conducted over a catalyst containing a hydrogenating metal component typically one from Group VI or Group VIII or mixture thereof, preferably Group VIII, more preferably noble Group VIII most preferably platinum on a halogenated refractory metal oxide support. The catalyst typically contains from 0.1-5.0 wt.% metal, preferably 0.1 to 1.0 wt.% metal, most preferably 0.2-0.6 wt.% metal. The refractory metal oxide support is typically a transition e.g. gamma or eta alumina and the halogen is most usually fluorine. Isomerization is accomplished under moderate to high temperature conditions of 270°C to 400°C, preferably 300°C to 360°C. Space velocity ranges from 0.10 to 10 v/v/hr, preferably 1.0 to 2.0 v/v/hr. Pressure ranges from 500 to 3000 psi H₂, preferably 1000 to 1500 psi H₂. Hydrogen gas rate ranges from 1000 to 10,000 SCF/B. Moderate levels of conversion of wax to isomerate are preferred. Conversions to a level such that about 40% or less unconverted wax remains in the 370°C+ fraction sent to the dewaxer, preferably 15-35% unconverted wax remains in the 370°C+ fraction sent to the dewaxer are preferred.
- As previously stated, if the isomerization catalyst is of the family which is normally presulfided before use, the prehydrotreating step can be dispensed with, but the isomerized wax product would still have to be freed of H₂S and NH₃ prior to being contacted with the second stage catalyst. This could be done by flashing or stripping of the product to remove H₂S and NH₃.
- A preferred catalyst for use in the present process contains a hydrogenation metal component which is a Group VIII noble metal or mixture thereof, preferably noble Group VIII metal, most preferably platinum on a fluorided alumina or material containing alumina, preferably alumina or material consisting predominantly (i.e. >50%) of alumina, most preferably gamma or eta alumina wherein said catalyst in its as introduced to waxy feed form is characterized by possessing (1) a hydrate level of 60 or less, preferably 10 to 60 determined as the relative amount of hydrate represented by a peak in the X-ray diffraction (XRD) pattern at 2ϑ = 5.66Å when a hydrate level of 100 corresponds to the XRD peak height exhibited by a standard material constituting 0.6 wt% Pt on 150 m²g γ alumina containing 7.2 wt% F wherein the fluorine has been deposited using an aqueous solution containing a high concentration of HF, i.e. 10 wt% and greater, preferably 10 to 15 wt% HF and the material dried at 150°C for 16 hours; (2) a surface nitrogen content N/Al ratio of 0.01 to less, preferably 0.007 or less, most preferably 0.004 or less, as determined by X-ray photoelectron spectroscopy (XPS); (3) a bulk fluorine concentration of about 2 to 10 wt% and (4) a surface fluorine concentration, defined as the amount of fluorine present in a layer extending from the surface to a depth of 1/100 inch of less than 3 wt%, preferably less than 1 wt%, most preferably less than 0.5 wt% provided that the surface fluoride concentration is less than the bulk fluoride concentration.
- The fluoride content of the catalyst can be determined in a number of ways.
- One technique analyzes the fluorided catalysts using oxygen combustion methodology which is well established in the literature. Approximately 8-10 mgs of sample is mixed with 0.1 g benzoic acid and 1.2 gms of mineral oil in a stainless steel combustion capsule which is mounted in a 300 mL. Parr oxygen combustion bomb. The "sample" is purged of air and subsequently combusted under 30 Atms of pure oxygen. Combustion products are collected in 5 mL. of deionized water. Once the reaction has gone to completion (about 15 minutes), the absorbing solution is quantitively transferred and made to fixed volume.
- Fluoride concentration of the sample is determined by ion chromatography analysis of the combustion product solution. Calibration curves are prepared by combusting several concentrations of ethanolic KF standards (in the same manner as the sample) to obtain a 0-10 ppm calibration range. Fluoride concentration of the catalyst is calculated on an ignition-loss-free-basis by comparison of the sample solution response to that of the calibration curve. Ignition loss is determined on a separate sample heated to 800 degrees F for at least 2 hours. Ion chromatographic analysis uses standard anion conditions.
- Another procedure employs the use of fluoride distillation with a titrimetric finish. Fluorides are converted into fluorosilicic acid (H₂SiF₆) by reaction with quartz in phosphoric acid medium, and distilled as such using super heated steam. This is the Willard-Winter-Tananaev distillation. It should be noted that the use of super heated, dry (rather than wet) steam is crucial in obtaining accurate results. Using a wet steam generator yielded results 10-20% lower. The collected fluorosilicic acid is titrated with standardized sodium hydroxide solution. A correction has to be made for the phosphoric acid which is also transferred by the steam. Fluoride data are reported on an ignition-loss-free-basis after determination of ignition loss on a sample heated to 400 degree C for 1 hour.
- Another preferred catalyst is a catalyst prepared by a process involving depositing a hydrogenation metal on an alumina or material containing alumina support, calcining said metal loaded support typically at between 350 to 500°C, preferably about 450 to 500°C for about 1 to 5 hours, preferably about 1 to 3 hours and fluoriding said metal loaded support using a high pH fluorine source solution to a bulk fluorine level of about 8 wt% or less (e.g., 2 to 8 wt%), preferably about 7 wt% or less, said high pH source solution being at a pH of 3.5 to 4.5 and preferably being a mixture of NH₄H and HF followed by rapid drying/heating in a thin bed or rotary kiln to insure thorough heating in air, an oxygen containing atmosphere or an inert atmosphere to a temperature between about 350 to 450°C in about 3 hours or less, preferably 375 to 400°C, and holding at the final temperature, if necessary, for a time sufficient to reduce the hydrate content to the aforesaid level (e.g. 1 to 5 hours) or using a low pH fluorine source solution having a pH of less than 3.5 using aqueous solutions of HF or appropriate mixtures of HF and NH₄F to a bulk fluorine level of about 10 wt% or less (e.g., 2 to 10 wt%), preferably about 8 wt% or less followed by drying/heating in a thin bed or rotary kiln to a temperature of about 350 to 450°C, preferably 375 to 425°C in air an oxygen containing atmosphere, or an inert atmosphere and holding for 1 to 5 hours. The alumina or alumina containing support material is preferably in the form of extrudates, and are preferably at least about 1/32 inch across the longest cross-sectional dimension. If the low pH prepared catalyst is first charged to a unit, the catalyst must be held at the final activation temperature for longer than 5 hours, preferably longer than 10 hours and preferably at temperatures of 400 to 450°C.
- The above catalysts typically contain from 0.1 to 5.0 wt% metal, preferably 0.1 to 1.0 wt% metal, most preferably 0.2 to 0.6 wt% metal.
- The dried/heated catalyst has a surface nitrogen content N/Al of 0.01 or less by X-ray photoelectron spectroscopy (XPS, preferably an N/Al of 0.007 or less, most preferably an N/Al of 0.004 or less by XPS.
- The catalyst following the above recited heating step can be charged to the isomerization reactor and brought quickly up to operating conditions. Alternatively following the above recited heating step the catalyst prepared using the pH 3.5 to 4.5 solution technique can be activated, preferably in pure or plant hydrogen (60 to 70% H₂) at 350 to 450°C, care being taken to employ short activation times, from 1 to 24 hours, preferably 2 to 10 hours being sufficient. Long activation times (in excess of 24 hours) have been found to be detrimental to catalyst performance. By way of comparison, catalysts made using solutions of pH less than 3.5 can be activated in pure or plant hydrogen at 350 to 500°C for from 1 to 48 hours or longer. In fact, if catalyst prepared using solutions of pH less than 3.5 are not heated first, then it is preferred that they be subsequently activated at more severe conditions, i.e. for longer times and/or at higher temperatures. On the other hand, if they are heated first, then moderate activation condition procedures similar to those employed with catalysts made from higher pH solution techniques will suffice.
- A typical activation profile shows a profile of 2 hours to go from room temperature with 100°C with the catalyst being held at 100°C for 0 to 2 hours then the temperature is raised from 100 to about 350 over a period of 1 to 3 hours with a hold at the final temperature of from 1 to 4 hours. Alternatively the catalyst can be activated by heating from room temperature to the final temperature of 350 to 450°C over a period of 2 to 7 hours with a hold at the final temperature of 0 to 4 hours. Similar activation can be accomplished by going from room temperature to the final temperature of 350 to 450°C in 1 hour.
- It is possible to dispense with a separate activation procedure entirely (provided the catalyst has been first heated in air). In these instances, the calcined catalyst is simply charged to the reactor, heated to just above the melting point of the wax feed, feed and hydrogen introduced onto the catalyst and thereafter the unit brought quickly up to operation conditions.
- Another preferred catalyst comprises a hydrogenating metal on fluorided alumina or material containing alumina support made by depositing the hydrogenation metal on the support and fluoriding said metal loaded support using acidic fluorine sources such as HF by any convenient technique such as spraying, soaking, incipient wetness, etc. to deposit between 2-10% F preferably 2-8%F. Following halogenation the catalyst is dried, typically at 120°C and then crushed to expose inner surfaces, the crushed catalyst is double sieved to remove fines and uncrushed particles. This sized catalyst is 1/32 inch or less and typically from 1/64 to 1/32 inch in size across its largest cross-sectional dimension.
- The starting particle or extrudate may be of any physical configuration. Thus, particles such as cylinders, trilobes or quadrilobes may be used. Extrudates of any diameter may be utilized and can be anywhere from 1/32 of an inch to many inches in length, the length dimension being set solely by handling considerations. It is preferred that following sizing the particle have a length smaller than the initial extrudate diameter.
- Following deposition of the hydrogenation metal and the fluoriding of the particle or extrudate, the particle or extrudate is crushed or fractured to expose inner surfaces.
- The crushing is conducted to an extent appropriate to the particle or extrudate with which one is starting. Thus, an extrudate which is 1 foot long and 1/16 inch in diameter would be sized into pieces which range anywhere from 1/64 to 1/32 inch across its longest cross-sectional dimension. Similarly, if the extrudate is only 1/16 inch to begin with it will be enough simply to break it in half, into two 1/32 inch pieces, for example.
- Alternatively, one can take a metal loaded support particle which is already about 1/32 inch in size or smaller and fluoride it as described above using HF.
- Generally, therefore, the sized material will range in size between about 1/64 to 1/32 inch in size.
- The uncalcined catalyst is activated in a hydrogen atmosphere such as pure hydrogen or plant hydrogen containing 60 to 70 vol% H₂ by heating to 350 to 500°C, preferably to 350 to 450°C for from 1 to 48 hours or longer. The hydrogen activation profiles previously described may be used here.
- This sized catalyst is unexpectedly superior for wax isomerization as compared to the uncrushed particle or extrudate starting material. It has also been discovered that 370°C+ oil products made using the sized catalyst as compared to the uncrushed or extrudate material starting with wax possessing about 5 to 10% oil exhibit higher VI's than do 370+ oil products made starting with wax possessing 0% oil (on the one hand) and about 20% oil (on the other). Therefore, to produce products having the highest VI one would isomerize wax having from 5 to 15% oil, preferably 7 to 10% oil using the "sized" catalyst produced using HF.
- One desiring to maximize the production of lube oil having a viscosity in the 5.6 to 5.9 cSt/100°C range should practice the isomerization process under low hydrogen treat gas rate conditions, treat gas rates on the order or 500 to 5000 SCF/bbl, H₂, preferably 2000 to 4000 SCF/bbl, H₂, most preferably about 2000 to 3000 SCF/bbl, H₂.
- The isomerized max material is then subjected to second stage catalyst using a Group VIII metal on refractory metal oxide catalyst or Group VIII metal on halogenated refractory metal oxide catalyst. The halogenated catalyst can be the same or different than the Group VIII metal on halogenated refractory metal oxide catalyst used in the prior isomerization reactor. If the same catalyst is used, the process can be run in blocked sequence,, the reactor first used to produce isomerate by being run at severe conditions with the isomerate going to tankage, the stored isomerate being subsequent recycled through the unit now run under mild conditions to remove trace quantities of polynuclear aromatics and other constituents deterimental to daylight and oxidation stability, but which conditions are not sufficient to effect further isomerization of the hydrocarbon components. This second stage zone is run at a temperature of about 170°C to 270°C, preferably 180°C to 220°C, a flow velocity of 0.25 to 10 v/v/hr, preferably 1 to 4 v/v/hr, a pressure of from 300 to 1500 psi H₂, preferably 500 to 1000 psi H₂, and a hydrogen gas rate of 500 to 10,000 SCF/B, preferably 1000 to 5000 SCF/B. Higher temperatures may be employed if pressures in excess of 1500 psi are used, but such high pressures may not be practical.
- Following isomerization and the mild second stage treatment described herein the isomerate is fractionated into a lubes cut and fuels cut, the lubes cut being identified as that fraction boiling in the 330°C+ range, preferably the 370°C+ range and even higher. This lubes fraction is then dewaxed to a pour point of about -21°C or lower. Dewaxing is accomplished by techniques which permit the recovery of unconverted wax, since in the process of the present invention this unconverted wax is recycled to the isomerization unit. It is preferred that this recycle wax be recycled to the main wax reservoir and be passed through the hydrotreating unit to remove any quantities of entrained dewaxing solvent which solvent could be detrimental to the isomerization catalyst. Alternatively, a separate stripper can be used to remove entrained dewaxing solvent or other contaminants. Since the unconverted wax is to be recycled dewaxing procedures which destroy the wax such as catalytic dewaxing are not recommended. Solvent dewaxing is utilized and employs typical dewaxing solvents. Solvent dewaxing utilizes typical dewaxing solvents such as C₃-C₆ ketones (e.g. methyl ethyl ketone, methyl isobutyl ketone and mixtures thereof), C₆-C₁₀ aromatic hydrocarbons (e.g. toluene), mixtures of ketones and aromatics (e.g. MEK/toluene), autorefrigerative solvents such as liquefied, normally gaseous C₂-C₄ hydrocarbons such as propane, propylene, butane, butylene and mixtures thereof, etc. at filter temperature of -25 to -30°C. The preferred solvent to dewax the isomerate, especially isomerates derived from heavier waxes (e.g. Bright Stock Waxes) under miscible conditions and thereby produce the highest yield of dewaxed oil at a high filter rate is a mixture of MEK/MIBK (20/80 v/v) used at a temperature in the range -25 to -30°C. Pour points lower than -21°C can be achieved using lower filter temperatures and other ratios of said solvent but a penalty is paid due to operation under immiscible conditions, the penalty being lower filter rates. Further when dewaxing isomerate made from a microwax, e.g. Bright Stock slack wax it has been found to be preferred that the fraction of the isomerate which is sent to the dewaxer is the "broad heart cut" identified as the fraction boiling between about 330 to 600°C, preferably about 370 to 580°C after such fractionation the fraction sent to the dewaxer has between 25 to 40% unconverted wax. The heavy bottoms fraction contains appreciable wax and can be recycled to the isomerization unit directly. However, if any hydrotreating or deoiling is deemed necessary or desirable then the fractionation bottoms are recycled by being sent first to the fresh feed reservoir and combined with the wax therein. As an alternative the isomerate from the second stage catalyst zone can be fractionated into narrow cuts and each cut individually dewaxed.
- Figures 1 and 2 present schematic representations of preferred embodiments of the wax isomerization process.
- In Figure 1 slack wax feed derived from for example a lighter oil such as 600N oil or lighter is fed from the reservoir (1) to a hydrotreater (3) via
line 2 wherein heteroatom compounds are removed from the wax. This hydrogenated slack wax is then fed vialine 4 to the isomerization unit (5) after which the total liquid product is fed first vialines line 6B to the fractionator tower (unit 8). The tube stream boiling in the 370°C+ range is then forwarded vialine 9 to the solvent dewaxer (unit 10) for the separation of waxy constituents therefrom, the dewaxed oil fraction being recovered via line 11 and forwarded to other conventional treatment processes normally employed on base stock or blending stock oils. The recovered wax is recycled either directly to the slack wax stream being fed to the isomerization unit or it is recycled to the wax reservoir (1) via line 12B for passage through the hydrotreater prior to being recycled to the isomerization unit. - In Figure 2 the wax processing stream is much like that of Figure 1, the main difference being that Figure 2 represents the scheme for handling heavier slack wax feeds, such as a wax feed derived from Bright Stock oil In such a case the wax from reservoir 1 is fed via
line 2 to the hydrotreater (3) prior to being sent vialine 4 to the isomerization unit (unit 5) after which it is fed vialines line 6B to the fractionator tower (unit 8). In the fractionator tower the isomerate made using the heavy wax is fractionated into a light fraction boiling in the 370°C- (a fuels cut) a lube cut boiling in the 370°C+ range and bottoms fraction boiling in the 580°C+ range. The lube fraction, a broad cut boiling in the 370°C to 580°C range is sent vialine 9 to the dewaxer (unit 10) as previously described. The 580°C+ bottoms fraction contains appreciable wax and is recycled vialines lines 13 and 13C with the wax inline 12 recovered from the dewaxing unit (10) in which case the total recycled stream can be fed directly to the isomerization unit vialines - It has also been found that prior to fractionation of the isomerate into various cuts and dewaxing said cuts the total liquid product (TLP) from the isomerization unit can be advantageously treated in a second stage at mild conditions using the isomerization catalyst or simply noble Group VIII on refractory metal oxide catalyst to reduce PNA and other contaminants in the isomerate and thus yield an oil or improved daylight stability.
- In that embodiment the total isomerate is passed over a charge of the isomerization catalyst or over just noble Gp VIII on e.g. transition alumina. Mild conditions are used, e.g. a temperature in the range of about 170-270°C, preferably about 180 to 220°C, at pressures of about 300 to 1500 psi H₂, preferably 500 to 1000 psi H₂, a hydrogen gas rate in the range of from about 500 to 10,000 SCF/bbl, preferably 1000 to 5000 SCF/bbl and a flow velocity of about 0.25 to 10 v/v/hr., preferably about 1-4 v/v/hr. Temperatures at the high end of the range should be employed only when similarly employing pressures at the high end of their recited range. Temperatures in excess of those recited may be employed if pressures in excess of 1500 psi are used, but such high pressures may not be practical or economic.
- The total isomerate can be treated under these mild conditions in a separate, dedicated unit or the TLP from the isomerization reactor can be stored in tankage and subsequently passed through the aforementioned isomerization reactor under said mild conditions. It has been found to be unnecessary to fractionate the 1st stage product prior to this mild 2nd
hold at 100°C for one hour; heat from 100°C to 400°C in three hours, hold at 450°C for four hours. - Platinum on fluorided γ-alumina made by soaking a commercially available Pt/γ-Al₂O₃ base (Catalyst A) in NH₄F/HF solution made up to a pH of about 4. The soaked material was washed, then dried then heated for two hours at 400°C in air. The catalyst was analyzed and had a bulk fluorine content of 6.9 wt%, platinum content of 0.62 wt%, surface N/Al ratio (by XPS) of 0.0040. This catalyst was activated by heating to 350°C in H₂ at 50 psi in the following manner; room temperature to 100°C in two hours, hold at 100°C for one hour; heat from 100°C to 350°C in two hours, hold at 350°C for one hour.
- Platinum on fluorided γ-alumina made by soaking a commercially available Pt/γ-Al₂O₃ base (Catalyst A) in 10% HF. The soaked material was washed and dried at 150°C in air. The catalyst was analyzed and had a bulk fluorine content of 8.0%, platinum content of 0.62 wt%. The catalyst was activated by heating to 400°C in H₂ at 300 psi in the following manner; room temperature to 100°C at 35°C per hour, hold at 100°C for 6 hours, heat from 100°C to 250°C at 10°C per hour, hold at 250°C for 12 hours; heat to 400°C at 10°C per hour; hold at 400°C for 3 hours.
- Commercially available platinum on γ-alumina comprising 0.5% Pt on γ-alumina from which halogen had been removed and activated by heating in 40 psi H₂ as follows: room temperature to 100°C in 2 hours, hold at 100°C for 1 hour; heat to 350°C over 2 hours, hold at 350°C for 1 hour.
- In the following examples raw slack waxes from the dewaxing of petroleum oils were hydrotreated to remove polar materials, as well as heteroatomic compounds (sulfur and nitrogen containing compounds) which would deactivate the platinum on fluorided alumina hydroisomerization catalysts. Any conventional hydrotreating catalyst can be used, e.g., Cyanamid's HDN-30; Katalco's NM-506; Ketjen's KF-840; etc. The prime processing targets for the hydrotreated material are a sulphur content of about 10 ppm or less and a nitrogen content of 1 ppm or less. In the present Example Ketjen KF-840 was used in the form of 1/20 inch quadrilobes. The catalyst, as received from the manufacturer, had 4% NiO and 19.5% MoO₃ on an alumina base, and had a surface area of 180 m²/gram, with an average pore volume of 0.35 cc/g, and an average pore radius of 38Å. Twelve liters of this catalyst was packed into a tubular fixed bed 189 cm long and 9.9 cm in diameter and sulfided by exposure to H₂S in hydrogen and a sulfur containing vacuum distillate. The hydrotreating unit can be run in either up flow or down flow mode. Two different slack waxes were hydrotreated, a Western Canadian 600N slack wax, and an Augusta Bright Stock slack wax. Typical properties of each feed are given below in Table 1.
TABLE 1 Slack Wax Source 600 Neutral Bright Stock Gravity, °API 36.2 31.5 Viscosity, 100°C,cSt 6.93 18.25 Sulphur, wppm 710 2290 Total Nitrogen, wppm 13 120 Basic Nitrogen, wppm 6 34 Asphaltenes, Wt.% - 0.14 Dewaxing Aid, Wt.% - 0.17 GC Distillation, initial °C 372 367 1%, °C 384 430 5%, °C 416 497 50%, °C 488 606 93%, °C 538 - Oil Content, Wt.% 19.6 12.9 Aromatic Content, Wt.% 4 6 - The above are representative assays of typical samples of the identified slack waxes.
- In point of fact significant changes, especially in sulphur and nitrogen contents, are seen in different samples of these slack waxes over time, reflecting variations between various crude samples and processing severities.
- The 600N slack wax was hydrotreated in an up-flow mode at 0.5 v/v/hr, 1000 psig hydrogen pressure and a gas treat rate of 1500 SCF H₂/B. For the first 2080 hours of operation reaction temperature was held at 320°C and thereafter at 330°C. The slack wax sulphur contents ranged from about 0.073 weight percent to 0.113 weight percent and nitrogen content ranged from 12 to 17 wppm. Periodic analysis of the hydrotreated wax showed that sulphur contents were consistently 4 wppm and lower, while nitrogen contents were always 2 wppm or less.
- The Bright Stock slack waxes feeds having different oil contents were hydrotreated in an up-flow mode at 380°C, 1000 psig hydrogen pressure and 1500 SCFH₂/B treat gas rate. The space velocity was varied from 0.42 to 0.5, in order to obtain the desired sulfur and nitrogen reduction. Inspections of the hydrotreated wax feeds used in the examples are given below in Table 2.
TABLE 2 Slack Wax Inspection Following Hydrotreating Wax Source 600 N Bright Stock A B Gravity, °API @15°C 36.3 35.7 34.1 Viscosity, 100°C, cSt 6.77 11.05 10.52 Sulphur, wppm 2 2 1 Nitrogen, wppm <1 <1 <1 Asphaltenes, Wt.% - 0.05 Dewaxing Aid, Wt.% - 0.00 GC Distillation, initial, °C 367 189 211 1%, °C 378 211 230 5%, °C 412 313 307 50%, °C 482 366 553 95%, °C 547 - - Oil Content, Wt.% 19.5 17.1 23.6 Aromatic Content, Wt.% 2 4 - - The slack waxes from the hydrotreater freed of H₂S and NH₃ were isomerized over various of the Pt-F/Al₂O₃ catalysts described earlier. The 370°C+ dewaxed oil yield reported herein below were determined by "Standard Test Method for Solvent Extractable on Petroleum Waxes" ASTM Test D-3235-73 (Reapproved 1983).
- (A) The hydrotreated Bright Stock slack wax (B) was isomerized at 320°C, 0.89 v/v/hr space velocity, 1000 psi (H₂) pressure and 5000 SCF/bbl, H₂, gas rate over a 200 cc charge of Catalyst B. The hydroconversion was conducted upflow mode and operated at a mass velocity was 160 pounds per hour/square foot (i.e. low mass velocity).
- The isomerate total liquid product (TLP) produced at conditions that gave 37.5 wt% conversion to 370°C⁻ when dewaxed at standard conditions gave a 370°C+ dewaxed oil yield of 48.5 wt% (Based on Feed).
- (B) The hydrotreated Bright Stock slack wax (B) was isomerized at low mass velocity at 325-330°C at .89 v/v/h, 1000 psig, H₂, 5000 SCF H₂/bbl over a 200 cc charge of Catalyst C. The isomerate Total Liquid Product (TLP) produced at conditions that gave 20.6. wt% conversion to 370°C⁻ when dewaxed at standard conditions gave the a 370°C+ dewaxed oil yield 41.7 wt% (based on feed).
- (C) The hydrotreated Bright Stock slack wax (A) was isomerized over a 3500 cc charge of Catalyst D in a series of six reactors at high mass velocity conditions (2000 pounds/hr/square foot) at two sets of isomerization conditions: (i) 313°C at 0.5 v/v/hr., 1000 psi, 5000 SCF H₂/bbl and (ii) 325°C at 1.0 v/v/hr., 1000 psi, 5000 SCF H₂/bbl yielding an isomerate blend (ii/i of 80/20) of product. Conversion (based on the blend) to 370°C- was 25.1 wt%. The 370°C+ dewaxed at standard conditions gave a dewaxed oil yield (based on blend) of 50.0 wt%.
- (D) The hydrotreated 600N slack wax was isomerized over 3500cc charge of Catalyst D in a series of six (6) reactors at high mass velocity conditions, 2000 pounds/hr/sq.ft. at 326°C, 1000 psi, 5000 SCF H₂/bbl, 1.0 v/v/hr. Conversion to 370°C- was 25.8. The yield of 370°C+ dewaxed oil was 51.0 wt% (based on feed).
- Base oils were prepared from the total liquid product coming from the isomerization zone by fractionating said TLP into various lube fractions and dewaxing said lube fraction to a pour point of -21°C.
- 1. The 600N slack wax isomerate (D) TLP was topped to 370°C+ and this lube oil fraction dewaxed to a pour point of -21°C by batch dewaxing using 100% MIBK solvent at a dilution rate of 4 volumes of solvent to one volume of oil at a 26°C filter temperature.
- 2. Bright Stock isomerate (B) was topped to 370°C+ and dewaxed to -21°C by batch dewaxing using 100% MIBK solvent at 4 volumes of solvent to 1 volume of oil at -26°C filter temperature.
- 3. Bright Stock isomerate (C) was vacuum distilled to give a 370-582°C heart-cut and dewaxed at -27°C using 15/85 MEK/MIBK at 4 volumes of solvent to 1 volume of oil to a -21°C pour. This dewaxed oil was then vacuum fractionated into 2% cuts at the front and back end of the desired heart-cut in order to allow blending to a final viscosity of 4.5 cSt at 100°C.
- 4. As in 3 (above) but the incremental cuts were blended to final dewaxed oil viscosities ranging from 8.0 to 8.3 cSt at 100°C.
- 5. As in 3 (above) but using Bright Stock isomerate (A) the incremental cuts from the "A" product distillation were blended to a final dewaxed oil viscosity of 8.0 cSt at 100°C.
- In the following examples daylight stability was determined on the products from 1 through 5 (above) by exposing 5 ml samples in the presence of air continuously in a light box apparatus in which the lamp used was an Excella fluorescent tube from Sunburst Electric which simulated the intensity and frequency range of actual solar radiation. Samples were rated daily on the degree of haze, floc and sludge formation as to time exposed to air and radiation.
- The dewaxed base stock oils above 1-5 were evaluated for daylight stability and found to exhibit the following:
TABLE 3 Dewaxed Base Oil # Daylight Stability 1 Light haze, 48 hrs; distinct haze 96 hrs. 2 Haze/sludge ≦ 24 hours 3 Haze/sludge ≦ 24 hours 4 Haze/sludge ≦ 24 hours 5 Haze/sludge ≦ 24 hours -
Base oils TABLE 4 KF-840 Hydrofined Dewaxed Base Oil Daylight Stability 3 Haze/sludge, 50 hours 4 Haze/sludge, 100 hours -
Dewaxed base oils TABLE 5 Dewaxed Base Oil Feed 3 4* 5 Catalyst B B B Hydrofinishing Conditions Temperature °C 160 180 200 200 225 200 Pressure, psi H₂ 1000 1000 1000 1000 1000 1000 Space Velocity v/v/hr 0.9 0.9 2.0 0.9 0.9 0.9 Gas Rate, SCF H₂/B 2270 2270 2270 2270 2270 5000 Inspection of Hydrofinished Oil Time to Form a Distinct Haze, days 3 6 13 10 8 >60 * Prior to hydrofinishing feed 4 had already developed a sludge which was filtered out prior to hydrofinishing and evaluation. - In the following examples 4 to 9, stabilized unfractionated total liquid isomerate products were hydrofinished under various conditions and over various catalysts and subsequently evaluated for daylight stability.
- 600N slack wax isomerate total liquid product (TLP), from the hydroisomerization (d) operation with catalyst D (Ni/Mo/Al₂O₃) was hydrofinished over KF-840 (conditions recited below). The hydrofinished material was fractionated to obtain the 370°C+ fraction for subsequent dewaxing to -21°C pour using 100% MIBK solvent at a 4/1 solvent to oil dilution ratio and -26°C filter temperature. This dewaxed oil fraction was evaluated for daylight stability.
TABLE 6 Hydrofinishing Conditions: Temperature °C 200 200 Pressure, psi, H₂ 1000 500 Gas Rate, SCF/B, H₂ 2500 2500 Space Velocity v/v/hr 2.0 2.0 Inspection of Hydrofinished Oil Time for dewaxed to form a slight Haze (days) 3 3 Time for Dewaxed Oil to form a Distinct Haze (days) 10 to 13 10 to 13 - The 600N slack wax isomerate (TLP), feed D and Bright Stock slack wax isomerate (TLP) feed B were hydrofinished over Pt/alumina, catalyst E (previously described), under the conditions recited below. The hydrofinished materials were fractioned into 370°C+ fraction and dewaxed to -20°C pour as recited in Example 4. The dewaxed fraction were evaluated for daylight stability (Table 7).
TABLE 7 Hydroisomerization (TLP) Feed D B Hydrofinishing Conditions: Temperature °C 200 200 200 Pressure, psi H₂ 1000 500 1000 Gas Rate, SCF/B, H₂ 2500 2500 2500 Space Velocity v/v/hr 2.0 2.0 0.9 Inspection of Hydrofinished Dewaxed Oil Time to Form a Slight Haze, days 16 16 16 - The 600N slack wax isomerate (TLP), feed D, was hydrofinished over Pt on alumina (1% Cl), Catalyst A, (previously described), under the conditions recited below. The hydrofinished isomerate was functioned to obtain the 370°C+ fraction for solvent dewaxing to -21°C pour using 100% MIBK solvent at 4/1 solvent to oil dilution ratio and -26° filter temperatures to dewax as recited in Example 4. The dewaxed fraction was evaluated for daylight stability (Table 8).
TABLE 8 Hydrofinishing Conditions: Temperature °C 200 200 Pressure, psi H₂ 1000 500 Gas Rate, SCF/B, H₂ 2500 2500 Space Velocity v/v/hr 2.0 2.0 Inspection of Hydrofinished dewaxed Oil Time to Form a Slight Haze, days 60 60 - The 600N slack wax isomerate (TLP), feed D, was hydrofinished over Pt/F-Al₂O₃, Catalyst C, conditions recited below. The hydrofinished isomerate was fractioned to obtain the 370°C+ fraction for segment dewaxing to -21°C pour using 100% MIBK solvent at 4/1 solvent to oil dilution ratio and -26°C filter temperature to dewax as recited in Example 4. The dewaxed fraction was evaluated for daylight stability (Table 9).
TABLE 9 Hydrofinishing Conditions: Temperature C 200 220 180 200 150 300 Pressure, psi H₂ 1000 1000 1000 500 1000 1000 Gas Rate, SCF/B,H₂ 2500 2500 2500 2500 2500 2500 Space Velocity v/v/hr 2.0 2.0 2.0 2.0 2.0 2.0 Inspection of Hydrofinished Dewaxed Oil Time to form a Slight Haze, days 17 17 17 17 5 7 Time to form a Distinct Haze, days 48 48 20 20 5 9 - From the above it is seen that a window of hydrofinishing conditions exists within which daylight stability of materials made from isomerate total liquid products is maximized. Hydrofinishing at temperatures between about 180 to 300°C appears to favor improved daylight stability.
- Bright Stock slack wax isomerate (TLP), feed (a) was hydrofinished over Pt/F-Al₂O₃, Catalyst B, conditions recited below. The unhydrofinished TLP and the hydrofinished materials were vacuum distilled to product 460 to 550°C fractions, then dewaxed. These fractions were dewaxed with 5% toluene/95% MIBK at a solvent oil ratio of 4:1 and a filter temperature of -27°C. Each dewaxed fraction was then evaluated for daylight stability.
TABLE 10 Feed Hydroisomerate(a) Hydrofinishing Conditions Temperature, °C - 200 270 Pressure, psi H₂ - 1000 1000 Gas Rate, SCF/B, H₂ - 5000 5000 Space Velocity, v/v/hr - 0.9 0.9 Inspections of Dewaxed Oil Un-hydrofinished Hydrofinished (460-550°C Fraction) Viscosity at 100°C, cSt 7.2 6.8 7.1 Time to Form a Distinct Haze, days ≦1 13 10 - Bright Stock slack wax, isomerate TLP, feed (c), was hydrofinished over Pt/F-Al₂O₃, Catalyst B, at conditions recited below. The hydrofinished materials were vacuum distilled to produce heart-cut fractions boiling in the 370°C to 580°C range. These fractions were dewaxed with 100% MIBK using a solvent:oil ratio of 4:1 and a filter temperature of -30°C. The dewaxed heart-cut fractions were then further fractionated into light (4.5 cSt) and heavy (8.4 cSt) dewaxed oil fractions as shown in Table 11 and evaluated for daylight stability.
TABLE 11 Hydrofinishing Conditions: Temperature °C 200 200 Pressure, psi H₂ 1000 1000 Gas Rate, SCF/B, H₂ 5000 2274 Space Velocity v/v/hr 0.9 2.0 Inspections of Dewaxed Oil Boiling Range, °C 417 to 460 460+ 435 to 460 460+ Viscosity at 100°C cSt 4.5 8.4 4.5 8.4 Pour Point, °C -27 -24 -33 -30 Time to Form a Distinct Haze, days 12 10 11 11 - From the above examples, it is clear that hydrofinishing the total liquid products coming from the isomerization unit using the Group VIII metal on refractory metal oxide or Group VIII metal on halogenated refractory metal oxide catalyst produced dewaxed base oils which exhibit superior daylight stability as compared to the unhydrofinished dewaxed base oils and dewaxed base oil hydrofinished using conventional hydrofinishing catalyst. The examples shows that hydrofinishing must be performed within a narrow window of temperature conditions, i.e. about 170-270°C, preferably 180-220°C when operating under consistent mild pressure, treat gas rate and flow velocity conditions.
- The following Example demonstrates the effect of mild condition hydrofinishing on a fractionated lube hydrocrackate.
- A hydrocracked lube basestock was prepared as follows:
- Recycle from a fuels hydrocracker was withdrawn with the hydrocracker operating at the following conditions:
Feed Heavy Coker Gas Oil Fresh Feed Rate, kB/D 11.2 Conversion, Wt.% 90.6 Recycle Withdrawal, kB/D 1.05 Reactor 1 temperature, °C 401.6 Reactor 2 temperature, °C376.5 Total Pressure, psi 2100 - This recycle was fractionated to give a lube stream in 26.3 LV% yield. The lube distillate was solvent dewaxed using a 40/60 mixture of MEK/MIBK, solvent to oil ratio of 2/1, and a filter temperature of -22°C. The resulting dewaxed oil had the following properties:
Viscosity at 40°C cSt 13.44 Viscosity Index 109 Saturates, Wt.% 96.0 - This basestock has excellent viscometric properties. A sample of this basestock was hydrofinished over a conventional sulphided Ni/Mo on Al₂O₃ catalyst (KF-840) at 300°C, 2.0 LHSV, 350 psi H₂, 500 SCF/B, H₂, treat gas rate. A similar sample of fractionated hydrocrackate was hydrofinished according to the invention over a Pt/F/Al₂O₃ catalyst (Catalyst B) at 200°C, 1.0 LHSV, 1000 psi H₂ and 5000 SCF/bbl treat gas rate. These three different oils were tested for daylight stability by two different methods. In method 1 a 5 ml vial was three-quarters filled with sample, loosely plugged with cotton wool, exposed to daylight in a north-facing window, and checked daily when possible for appearance. In
method 2 oil samples (again in a 5 ml vial plugged with cotton wool) were exposed continuously in a light box apparatus in which the lamp used Excella fluorescent tube from Sunburst Electric) simulates the intensity and frequency range of actual radiation. Samples were rated daily in terms of time to haze, floc and sludge. - The results are presented in Table 12
Table 12 Test Method 1 (North Window) Unhydrofinished Conventional Hydrofinishing Mild Hydrofinishing Time to Light Sludge (days) 5 12 > 16 days Time to Heavy Sludge (days) 12 - - Appearance of light sludge or haze indicates the sample has failed. The oil treated according to the present invention as clear and white after 16 days, indicating excellent stability in this test. The unhydrofinished and conventionally hydrofinished oils produced sludge in an unacceptably short period of time. Test Method 2 (Light Box) Unhydrofinished Conventional Hydrofinishing Mild Hydrofinishing Time to Light Haze (hours) 24 48 120 Time to Light Sludge (hours) 48 55 169 Time to Heavy Sludge (hours) 120 120 288 Again, the oil hydrofinished over the pt/F/Al₂O₃ catalyst at low temperatures is considerably improved in daylight stability compared with conventional hydrofinishing and unfinished oil. - An experiment was conducted to determine the effect of practicing mild hydrofining on a total liquid product hydrocrackate. In this example the feed, the total liquid product hydrocrackate is the recycle from the fuels hydrocracker described in Comparative Example 1. A portion of this stream, without fractionation was passed over Catalyst D at 200°C, 1.0 LHSV 1000 psi H₂ and 5000 SCF/bbl, H₂, while a second portion was treated conventionally using KF-840 under the conditions recited in Comparative Example 1. These materials were then fractionated and dewaxed to produce lube oil products which were evaluated for daylight stability using the light box procedure recited in Comparative Example 1. The results are presented in Table 13.
TABLE 13 Test Method 2 (Light Box) Unhydrofinished Conventional Hydrofinishing as a TLP Mild Hydrofinishing as a TLP Time to Light Haze (hours) 18 18 45 Time to Light Sludge (hours) 32 32 54 Time to Heavy Sludge (hours) 54 79 97 - While it is seen that mild hydrofinishing of the TLP hydrocrackate improves the daylight stability of a base oil produced from said material to some extent as compared to conventional hydrofinishing, it is clear that the level of improvement is not such as to significantly alter the behavioral properties of the oil.
- This Example does show, however, that the improvements to daylight stability observed for wax isomerate TLP resulting from mild hydrorefining are significant and unexpected.
Claims (7)
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AU (1) | AU609553B2 (en) |
CA (1) | CA1328635C (en) |
DE (1) | DE3874510T2 (en) |
ES (1) | ES2034274T3 (en) |
MX (1) | MX169942B (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0471524A1 (en) * | 1990-08-14 | 1992-02-19 | Exxon Research And Engineering Company | Method of hydrotreating heavy hydroisomerate fractionator bottoms to produce quality light oil upon subsequent re-fractionation |
US5453176A (en) * | 1993-10-13 | 1995-09-26 | Narloch; Bruce A. | Process for preparing white oil containing a high proportion of isoparaffins |
EP0710710A2 (en) * | 1994-11-01 | 1996-05-08 | Exxon Research And Engineering Company | Catalyst combination for improved wax isomerization |
EP0743351A2 (en) * | 1995-05-19 | 1996-11-20 | Shell Internationale Researchmaatschappij B.V. | Process for the preparation of lubricating base oils |
EP0744452A2 (en) * | 1995-04-28 | 1996-11-27 | Shell Internationale Researchmaatschappij B.V. | Process for producing lubricating base oils |
CN1102641C (en) * | 1995-04-28 | 2003-03-05 | 国际壳牌研究有限公司 | Process for producing lubricating base oils |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7132042B2 (en) * | 2002-10-08 | 2006-11-07 | Exxonmobil Research And Engineering Company | Production of fuels and lube oils from fischer-tropsch wax |
JP5957515B2 (en) * | 2012-03-30 | 2016-07-27 | Jxエネルギー株式会社 | Lubricating base oil and method for producing the same |
JP5957516B2 (en) * | 2012-03-30 | 2016-07-27 | Jxエネルギー株式会社 | Lubricating base oil and method for producing the same |
CN112601804B (en) * | 2018-09-07 | 2023-01-13 | 引能仕株式会社 | Method for producing wax, and method for producing lubricant base oil |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2267360A1 (en) * | 1974-04-11 | 1975-11-07 | Atlantic Richfield Co | |
US3979279A (en) * | 1974-06-17 | 1976-09-07 | Mobil Oil Corporation | Treatment of lube stock for improvement of oxidative stability |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2320775A1 (en) * | 1975-08-13 | 1977-03-11 | Raffinage Cie Francaise | HYDROCARBON ISOMERIZATION CATALYZERS, PROCESS FOR PREPARATION AND APPLICATION OF SAID CATALYSTS |
JPS5242506A (en) * | 1975-10-02 | 1977-04-02 | Toa Nenryo Kogyo Kk | Hydrotreating process of petroleum wax |
JPS5397006A (en) * | 1977-02-04 | 1978-08-24 | Labofina Sa | Production of heavy paraffins free from aromatic components |
-
1988
- 1988-12-16 EP EP19880311988 patent/EP0323724B1/en not_active Expired
- 1988-12-16 ES ES88311988T patent/ES2034274T3/en not_active Expired - Lifetime
- 1988-12-16 AU AU26941/88A patent/AU609553B2/en not_active Ceased
- 1988-12-16 MX MX1423088A patent/MX169942B/en unknown
- 1988-12-16 DE DE19883874510 patent/DE3874510T2/en not_active Expired - Fee Related
- 1988-12-16 CA CA000586216A patent/CA1328635C/en not_active Expired - Fee Related
- 1988-12-19 JP JP63320312A patent/JP2711120B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2267360A1 (en) * | 1974-04-11 | 1975-11-07 | Atlantic Richfield Co | |
US3979279A (en) * | 1974-06-17 | 1976-09-07 | Mobil Oil Corporation | Treatment of lube stock for improvement of oxidative stability |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0471524A1 (en) * | 1990-08-14 | 1992-02-19 | Exxon Research And Engineering Company | Method of hydrotreating heavy hydroisomerate fractionator bottoms to produce quality light oil upon subsequent re-fractionation |
US5453176A (en) * | 1993-10-13 | 1995-09-26 | Narloch; Bruce A. | Process for preparing white oil containing a high proportion of isoparaffins |
EP0710710A2 (en) * | 1994-11-01 | 1996-05-08 | Exxon Research And Engineering Company | Catalyst combination for improved wax isomerization |
EP0710710A3 (en) * | 1994-11-01 | 1996-07-03 | Exxon Research Engineering Co | Catalyst combination for improved wax isomerization |
EP0744452A2 (en) * | 1995-04-28 | 1996-11-27 | Shell Internationale Researchmaatschappij B.V. | Process for producing lubricating base oils |
EP0744452A3 (en) * | 1995-04-28 | 1997-01-22 | Shell Internationale Researchmaatschappij B.V. | Process for producing lubricating base oils |
CN1102641C (en) * | 1995-04-28 | 2003-03-05 | 国际壳牌研究有限公司 | Process for producing lubricating base oils |
EP0743351A2 (en) * | 1995-05-19 | 1996-11-20 | Shell Internationale Researchmaatschappij B.V. | Process for the preparation of lubricating base oils |
EP0743351A3 (en) * | 1995-05-19 | 1997-01-22 | Shell Int Research | Process for the preparation of lubricating base oils |
Also Published As
Publication number | Publication date |
---|---|
EP0323724A3 (en) | 1990-03-28 |
DE3874510T2 (en) | 1993-03-18 |
MX169942B (en) | 1993-08-02 |
AU609553B2 (en) | 1991-05-02 |
AU2694188A (en) | 1989-06-22 |
JP2711120B2 (en) | 1998-02-10 |
EP0323724B1 (en) | 1992-09-09 |
ES2034274T3 (en) | 1993-04-01 |
JPH02263896A (en) | 1990-10-26 |
DE3874510D1 (en) | 1992-10-15 |
CA1328635C (en) | 1994-04-19 |
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