CA2630755C - Process for the production of low sulfur diesel and high octane naphtha - Google Patents
Process for the production of low sulfur diesel and high octane naphtha Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 32
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 16
- 239000011593 sulfur Substances 0.000 title claims abstract description 16
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 6
- 238000004517 catalytic hydrocracking Methods 0.000 claims abstract description 41
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 125000003118 aryl group Chemical group 0.000 claims abstract description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims description 40
- 239000001257 hydrogen Substances 0.000 claims description 40
- 239000003054 catalyst Substances 0.000 claims description 25
- 229930195733 hydrocarbon Natural products 0.000 claims description 25
- 150000002430 hydrocarbons Chemical class 0.000 claims description 25
- 239000007788 liquid Substances 0.000 claims description 19
- 239000004215 Carbon black (E152) Substances 0.000 claims description 16
- 238000006477 desulfuration reaction Methods 0.000 claims description 12
- 230000023556 desulfurization Effects 0.000 claims description 12
- 238000009835 boiling Methods 0.000 claims description 10
- 238000005194 fractionation Methods 0.000 claims description 7
- -1 monocyclic aromatic compounds Chemical class 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 description 21
- 239000002184 metal Substances 0.000 description 21
- 239000010457 zeolite Substances 0.000 description 17
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 229910021536 Zeolite Inorganic materials 0.000 description 9
- 239000003921 oil Substances 0.000 description 9
- 239000002585 base Substances 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 5
- 238000005336 cracking Methods 0.000 description 5
- 238000004231 fluid catalytic cracking Methods 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 230000002950 deficient Effects 0.000 description 4
- 239000003502 gasoline Substances 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 150000003863 ammonium salts Chemical class 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000004821 distillation Methods 0.000 description 3
- 238000005342 ion exchange Methods 0.000 description 3
- 239000002808 molecular sieve Substances 0.000 description 3
- 229910052680 mordenite Inorganic materials 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910000510 noble metal Inorganic materials 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 238000004523 catalytic cracking Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012013 faujasite Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 150000001342 alkaline earth metals Chemical group 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- UNYSKUBLZGJSLV-UHFFFAOYSA-L calcium;1,3,5,2,4,6$l^{2}-trioxadisilaluminane 2,4-dioxide;dihydroxide;hexahydrate Chemical compound O.O.O.O.O.O.[OH-].[OH-].[Ca+2].O=[Si]1O[Al]O[Si](=O)O1.O=[Si]1O[Al]O[Si](=O)O1 UNYSKUBLZGJSLV-UHFFFAOYSA-L 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 229910052676 chabazite Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 229910052675 erionite Inorganic materials 0.000 description 1
- 229910001657 ferrierite group Inorganic materials 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052677 heulandite Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000011275 tar sand Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- C10G69/00—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one other conversion process
- C10G69/14—Treatment of hydrocarbon oils by at least one hydrotreatment process and at least one other conversion process plural parallel stages only
-
- 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
- C10G2400/00—Products obtained by processes covered by groups C10G9/00 - C10G69/14
- C10G2400/04—Diesel oil
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
A process for the production of low sulfur diesel and high octane naphtha. Distillate effluent from a hydrodesulfurization reaction zone and effluent from a hydrocracking reaction zone fed with dealkylated, highly aromatic feed are admixed and separated to produce a hydrogen gas stream, low-sulfur diesel and high octane naphtha.
Description
PROCESS FOR THE PRODUCTION OF LOW SULFUR
DIESEL AND HIGH OCTANE NAPHTHA
BACKGROUND OF THE INVENTION
[0001] This invention relates to a process for the production of low sulfur diesel and high octane naphtha. More specifically, the invention is an integrated process for the hydrodesulfurization of middle distillate hydrocarbon streams and the hydrocracking of highly aromatic hydrocarbon streams.
DIESEL AND HIGH OCTANE NAPHTHA
BACKGROUND OF THE INVENTION
[0001] This invention relates to a process for the production of low sulfur diesel and high octane naphtha. More specifically, the invention is an integrated process for the hydrodesulfurization of middle distillate hydrocarbon streams and the hydrocracking of highly aromatic hydrocarbon streams.
[0002] Petroleum refiners produce desirable products such as turbine fuel, diesel fuel and middle distillates, as well as naphtha and gasoline, by hydrocracking a hydrocarbon feedstock derived from crude oil, for example. Feedstocks most often subjected to hydrocracking are gas oils and heavy gas oils recovered from crude oil by distillation. Refiners also subject middle distillate hydrocarbon streams to hydrodesulfurization. Although a wide variety of process flow schemes, operating conditions and catalysts have been used in commercial activities, there is always a demand for new hydroprocessing methods which provide lower costs, more valuable product yields and improved operability.
INFORMATION DISCLOSURE
INFORMATION DISCLOSURE
[0003] US 4,943,366 (Fischer et al.) discloses a hydrocracking process for converting highly aromatic, substantially dealkylated feedstock into high octane gasoline.
BRIEF SUMMARY OF THE INVENTION
BRIEF SUMMARY OF THE INVENTION
[0004] The present invention is an integrated process for the production of low sulfur diesel and high octane naphtha. The process of the present invention utilizes a middle distillate hydrocarbon stream and a highly aromatic hydrocarbon stream. The middle distillate hydrocarbon feedstock is reacted with fresh make-up hydrogen in a hydrodesulfurization reaction zone and the highly aromatic hydrocarbon stream is reacted with recycle hydrogen in a hydrocracking zone. The resulting effluents from the two zones are introduced into a common high pressure vapor liquid separator to produce a hydrogen-rich recycle gas and a liquid stream containing desulfurized diesel and high octane naphtha which are then subsequently separated.
[0005] The use of make-up hydrogen as the source of hydrogen for the hydrodesulfurization reaction zone minimizes the recycle compressor duty and the use of the common separation and fractionation zones result in the advantages of lower capital and operating expenses.
100061 Other embodiments of the present invention encompass further details such as detailed descriptions of feedstocks, hydrodesulfurization catalysts, hydrocracking catalysts, and preferred operating conditions, all of which are hereinafter disclosed in the following discussion of each of these facets of the invention.
BRIEF DESCRIPTION OF THE DRAWING
[0007] The drawing is a simplified process flow diagram of a preferred embodiment of the present invention. The drawing is intended to be schematically illustrative of the present invention and not be a limitation thereof.
DETAILED DESCRIPTION OF THE INVENTION
[00081 The present invention is an integrated process for the hydrodesulfurization of middle distillate hydrocarbon streams and the hydrocracking of highly aromatic hydrocarbon streams.
Preferred feedstocks to the hydrodesulfurization reaction zone include distillate hydrocarbons boiling at a temperature greater than 149 C (300 F) and more preferably boiling in the range from 149 C (300 F) to 399 C (750 F). Distillate hydrocarbon feedstocks are most often recovered from crude oil by distillation. However, distillate hydrocarbons may be utilized from any convenient source such as tar sand extract and gas to liquids for example.
Furthermore, the distillate hydrocarbon feedstocks may contain from 0.1 to 4 wt-% sulfur.
100091 The preferred highly aromatic hydrocarbon feedstocks boil in the range from 149 C
(300 F) to 343 C (650 F). Highly aromatic, substantially dealkylated hydrocarbons are produced during the fluid catalytic cracking (FCC) of vacuum gas oils to produce high octane gasoline boiling range hydrocarbons. FCC is a thermally severe process which is operated without the presence of added hydrogen to reject carbon to coke and to produce residual fractions. During catalytic cracking, the high molecular weight feedstock disproportionates into relatively hydrogen-rich light liquids and aromatic, hydrogen-deficient heavier distillates and residues. The catalytic cracking in the absence of hydrogen does not provide significant desulfurization nor is the nitrogen content of the feed selectively rejected with the coke. The sulfur and nitrogen therefore concentrate in heavier cracking products aild produces significant quantities of highly aromatic, hydrogen-deficient middle and heavy distillates with high sulfur and nitrogen levels.
Recycling these liquids to the catalytic cracker is not an attractive option.
A typical light cycle oil (LCO) from an FCC contains 3 wt-% sulfur, 700 wppm nitrogen and greater than 80 vol-%
aromatics. Present market requirements make refractory product streams such as light cycle oil particularly difficult to dispose of as commercially valuable products.
[0010] In one embodiment of the present invention, a highly aromatic, hydrogen deficient and substantially dealkylated hydrocarbon feedstock is introduced into a hydrocracking zone. The hydrocracking zone may contain one or more beds of the same or different catalyst. In one embodiment the preferred hydrocracking catalysts utilize amorphous bases or low-level zeolite bases combined with one or more Group VIII or Group VIB metal hydrogenating components. In another embodiment the hydrocracking zone contains a catalyst which comprises, in general, any crystalline zeolite cracking base upon which is deposited a minor proportion of a Group VIII
metal hydrogenating component. Additional hydrogenating components may be selected from Group VIB for incorporation with the zeolite base. The zeolite cracking bases are sometimes referred to in the art as molecular sieves and are usually composed of silica, alumina and one or more exchangeable cations such as sodium, magnesium, calcium, rare earth metals, etc. They are further characterized by crystal pores of relatively uniform diameter between 4 and 14 angstroms (10-10 meters). It s preferred to employ zeolites having a silica/alumina mole ratio between 3 and 12. Suitable zeolites found in nature include, for example, mordenite, stillbite, heulandite, ferrierite, dachiardite, chabazite, erionite and faujasite. Suitable synthetic zeolites include, for example, the B, X, Y and L crystal types, e.g., synthetic faujasite and mordenite. The preferred zeolites are those having crystal pore diameters between 8 and 12 angstroms (10-10 meters), wherein the silica/alumina mole ratio is 4 to 6. A prime example of a zeolite falling in the preferred group is synthetic Y molecular sieve.
100111 The natural occurring zeolites are normally found in a sodium form, an alkaline earth metal form, or mixed forms. The synthetic zeolites are nearly always prepared first in the sodium form. In any case, for use as a cracking base it is preferred that most or all of the original zeolitic monovalent metals be ion-exchanged with a polyvalent metal and/or with an ammonium salt followed by heating to decompose the ammonium ions associated with the zeolite, leaving in their place hydrogen ions and/or exchange sites which have actually been decationized by further removal of water. Hydrogen or "decationized" Y zeolites of this nature are more particularly described in US 3,130,006.
100121 Mixed polyvalent metal-hydrogen zeolites may be prepared by ion-exchanging first with ammonium salt, then partially back exchanging with a polyvalent metal salt and then calcining. In some cases, as in the case of synthetic mordenite, the hydrogen forms can be prepared by direct acid treatment of the alkali metal zeolites. The preferred cracking bases are those which are at least 10 percent, and preferably at least 20 percent, metal-cation-deficient, based on the initial ion-exchange capacity. A specifically desirable and stable class of zeolites are those wherein at least 20 percent of the ion exchange capacity is satisfied by hydrogen ions.
[00131 The active metals employed in the preferred hydrocracking catalysts of the present invention as hydrogenation components are those of Group VIII, i.e., iron, cobalt, nickel, ruthenium, rhodium, palladium, osmium, iridium and platinum. In addition to these metals, other promoters may also be employed in conjunction therewith, including the metals of Group VIB, e.g., molybdenum and tungsten. The amount of hydrogenating metal in the catalyst can vary within wide ranges. Broadly speaking, any amount between 0.05 percent and 30 percent by weight may be used. In the case of the noble metals, it is normally preferred to use 0.05 to 2 wt-%. The preferred method for incorporating the hydrogenating metal is to contact the zeolite base material with an aqueous solution of a suitable compound of the desired metal wherein the metal is present in a cationic form. Following addition of the selected hydrogenating metal or metals, the resulting catalyst powder is then filtered, dried, pelleted with added lubricants, binders or the like if desired, and calcined in air at temperatures of, e.g., 371 -648 C (700 -1200 F) in order to activate the catalyst and decompose ammonium ions. Alternatively, the zeolite component may first be pelleted, followed by the addition of the hydrogenating component and activation by calcining. The foregoing catalysts may be employed in undiluted form, or the powdered zeolite catalyst may be mixed and copelleted with other relatively less active catalysts, diluents or binders such as alumina, silica gel, silica-alumina cogels, activated clays and the like in proportions ranging between 5 and 90 wt-%. These diluents may be employed as such or they may contain a minor proportion of' an added hydrogenating metal such as a Group VIB and/or Group VIII metal.
[00141 Additional metal promoted hydrocracking catalysts may also be utilized in the process of the present invention which comprises, for example, aluminophosphate molecular sieves, crystalline chromosilicates and other crystalline silicates. Crystalline chromosilicates are more fully described in US 4,363,718 (Klotz).
[0015] The hydrocracking of the hydrocarbonaceous feedstock in contact with a hydrocracking catalyst is conducted in the presence of hydrogen and preferably at hydrocracking reactor conditions which include a temperature from 260 C (500 F) to 426 C
(800 F), a pressure from 7.0 MPa (1000 psig) to 10.5 MPa (1500 psig), a liquid hourly space velocity (LHSV) from 0.1 to 30 hr 1, and a hydrogen circulation rate from 2000 (337 normal m3/m3) to 25,000 (4200 normal m3/m3) standard cubic feet per barrel.
[0016] The resulting effluent from the hydrocracking zone is preferably contacted with an aqueous stream to dissolve any ammonium salts and partially condensed, and then introduced into a high pressure vapor-liquid separator operated at a pressure substantially equal to the hydrocracking zone and a temperature in the range from 38 C (100 F) to 71 C
(160 F). An aqueous stream is recovered from the vapor-liquid separator. A hydrogen-rich gaseous stream is removed from the vapor-liquid separator to provide at least a majority and preferably all of the hydrogen introduced into the hydrocracking zone.
[0017] In one embodiment of the present invention, a distillate hydrocarbon boiling at a temperature greater than 149 C (300 F) is introduced into a desulfurization reaction zone together with a hydrogen-rich make-up stream at desulfurization reaction conditions. Preferred desulfurization reaction conditions include a temperature from 260 C (500 F) to 426 C (800 F), a pressure from 7.0 MPa (1000 psig) to 10.5 MPa (1500 psig), and a liquid hourly space velocity from 0.1 hr-I to 10 hr"1.
[00181 Suitable desulfurization catalysts for use in the present invention are any known convention desulfurization catalysts and include those which are comprised of at least one Group VIII metal, preferably iron, cobalt and nickel, more preferably cobalt and/or nickel and at least one Group VI metal, preferably molybdenum and tungsten, on a high surface area support material, preferably alumina. Other suitable desulfurization catalysts include zeolitic catalysts, as well as noble metal catalysts where the noble metal is selected from palladium and platinum. It is within the scope of the present invention that more than one type of desulfurization catalyst be used in the same reaction vessel. Two or more catalyst beds and one or more quench points may be utilized in the reaction vessel or vessels. The Group VIII metal is typically present in an amount ranging from 2 to 20 wt- ro, preferably from 4 to 12 wt-%. The Group VI
metal will typically be present in an amount ranging from I to 25 wt-%, preferably from 2 to 25 wt-%.
[0019] The resulting effluent from the desulfurization reaction zone is contacted with an aqueous stream and partially condensed, and then introduced into the previously described high pressure vapor-liquid separator.
[0020] Fresh make-up hydrogen is directly introduced into the desulfurization reaction zone in order to supply high purity hydrogen to maximize the activity of the desulfurization catalyst. In a preferred embodiment, at least a majority of the hydrogen-rich recycle gas which is recovered in the high pressure vapor-liquid separator is recycled to the hydrocracking zone and more preferably essentially all of the hydrogen-rich recycle gas is recycled to the hydrocracking zone.
DETAILED DESCRIPTION OF THE DRAWING
[0021] In the drawing, the process of the present invention is illustrated by means of a simplified schematic flow diagram in which such details as pumps, instrumentation, heat-exchange and heat-recovery circuits, compressors and similar hardware have been deleted as being non-essential to an understanding of the techniques involved. The use of such miscellaneous equipment is well within the purview of one skilled in the art.
[0022] Referring now to the drawing, a distillate hydrocarbon feedstock is introduced into the process via line 3 and is admixed with a fresh make-up hydrogen stream which is introduced via line 1. The resulting admixture is transported via line 4 and introduced into hydrodesulfurization reaction zone 5. A resulting effluent from hydrodesulfurization reaction zone 5 is carried via lines 6 and 8 and introduced into cold high pressure separator 9. A hydrogen-rich gaseous stream is removed from cold high pressure separator 9 via line 10 and introduced into compressor 11. A
resulting compressed hydrogen-rich gaseous stream is transported via lines 12 and 14 and admixed with a light cycle oil feedstock provided via line 16 and the resulting admixture is transported via line 2 and introduced into hydrocracking zone 17. A resulting effluent from hydrocracking zone 17 is transported via line 7 and 8 and introduced into cold high pressure separator 9. Another hydrogen-rich gaseous stream is introduced via line 15 into hydrodesulfurization reaction zone 5. Yet another hydrogen-rich gaseous stream is introduced via line 13 into hydrocracking zorre 17 to provide quench. A hydrocarbonaceous liquid stream is removed from cold high pressure separator 9 via line 18 and introduced into low pressure flash drum 19. A gaseous stream contaiiiing hydrogen and low boiling gaseous hydrocarbons are removed from low pressure flash drum 19 via line 20 and recovered. A liquid hydrocarbonaceous stream is removed from low pressure flash drum 19 via line 21 and introduced into fractionation zone 22. A normally gaseous hydrocarbonaceous stream is removed from fractionation zone 22 via line 23 and recovered. A high octane naphtha stream is removed from fractionation zone 22 via line 24 and recovered. The high octane naphtha stream may be recovered from fractionation zone 22 in any convenient manner and is preferably a sidecut as shown. A low sulfur diesel stream is removed from fractionation zone 22 via line 25 and recovered.
[0023] The process of the present invention is further demonstrated by the following illustrative embodiment. This illustrative embodiment is, however, not presented to unduly limit the process of this invention, but to further illustrate the advantage of the hereinabove-described embodiment. The following data were not obtained by the actual performance of the present invention but are considered prospective and reasonably illustrative of the expected performance of the invention.
ILLUSTRATIVE EMBODIMENT
[0024] A blend of straight run diesel and light coker gas oil (LCGO) in an amount of 4372 m'/day (27,500 barrels per day) and having the characteristics presented in Table 1 is introduced along with a high purity make-up hydrogen stream into a hydrodesulfurization reaction zone operated at hydrodesulfurization reaction conditions summarized and presented in Table 2.
[0025] A stream of FCC light cycle oil (LCO) in an amount of 3657 m'/day (23,000 barrels per day) and having the characteristics presented in Table 1 is introduced into a hydrocracking zone operated at hydrocracking conditions summarized and presented in Table 2.
[0026] The resulting effluent from the hydrodesulfurization reaction zone and 'the hydrocracking zone is cooled, partially condensed and introduced into a cold, high pressure vapor liquid separator operated at a pressure of 9.7 MPa (1400 psig) and a temperature of 43 C (110 F) to produce a hydrogen-rich recycle gas stream and a liquid hydrocarbonaceous stream. The hydrogen-rich recycle gas stream is recycled to the hydrocracking zone and the liquid hydrocarbonaceous stream is fractionated to produce a high octane naphtha stream (gasoline) boiling in the range of 88 C (185 F) to 193 C (380 F), in the amount of 2145 m3/day (13,500 barrels per day) and having an octane number of 87, and a diesel stream boiling at a temperature greater than 193 C (380 F) in an amount of 5500 m3/day (34,500 barrels per day) and having a sulfur content of <10 ppm and a cetane Index of 46.
Diesel/LCGO Light Cycle Oil Specific gravity 0.87 0.96 Total sulfur, wt-% 2 1 Total nitrogen, weight ppm 725 900 Distillation, C ( F) IBP 146 (295) 215 (420) 10% 222 (432) 263 (506) 50% 278 (543) 304 (580) 90% 336 (638) 349 (660) EP 390 (735) 371 (700) Hydrodesulfurization Hydrocracking Pressure, MPa (psig) 9.7 (1400) 9.7 (1400) Temperature, C ( F) 371 (700) 371 (700) [00271 The foregoing description, drawing and illustrative embodiment clearly illustrate the advantages encompassed by the process of the present invention and the benefits to be afforded with the use thereof.
100061 Other embodiments of the present invention encompass further details such as detailed descriptions of feedstocks, hydrodesulfurization catalysts, hydrocracking catalysts, and preferred operating conditions, all of which are hereinafter disclosed in the following discussion of each of these facets of the invention.
BRIEF DESCRIPTION OF THE DRAWING
[0007] The drawing is a simplified process flow diagram of a preferred embodiment of the present invention. The drawing is intended to be schematically illustrative of the present invention and not be a limitation thereof.
DETAILED DESCRIPTION OF THE INVENTION
[00081 The present invention is an integrated process for the hydrodesulfurization of middle distillate hydrocarbon streams and the hydrocracking of highly aromatic hydrocarbon streams.
Preferred feedstocks to the hydrodesulfurization reaction zone include distillate hydrocarbons boiling at a temperature greater than 149 C (300 F) and more preferably boiling in the range from 149 C (300 F) to 399 C (750 F). Distillate hydrocarbon feedstocks are most often recovered from crude oil by distillation. However, distillate hydrocarbons may be utilized from any convenient source such as tar sand extract and gas to liquids for example.
Furthermore, the distillate hydrocarbon feedstocks may contain from 0.1 to 4 wt-% sulfur.
100091 The preferred highly aromatic hydrocarbon feedstocks boil in the range from 149 C
(300 F) to 343 C (650 F). Highly aromatic, substantially dealkylated hydrocarbons are produced during the fluid catalytic cracking (FCC) of vacuum gas oils to produce high octane gasoline boiling range hydrocarbons. FCC is a thermally severe process which is operated without the presence of added hydrogen to reject carbon to coke and to produce residual fractions. During catalytic cracking, the high molecular weight feedstock disproportionates into relatively hydrogen-rich light liquids and aromatic, hydrogen-deficient heavier distillates and residues. The catalytic cracking in the absence of hydrogen does not provide significant desulfurization nor is the nitrogen content of the feed selectively rejected with the coke. The sulfur and nitrogen therefore concentrate in heavier cracking products aild produces significant quantities of highly aromatic, hydrogen-deficient middle and heavy distillates with high sulfur and nitrogen levels.
Recycling these liquids to the catalytic cracker is not an attractive option.
A typical light cycle oil (LCO) from an FCC contains 3 wt-% sulfur, 700 wppm nitrogen and greater than 80 vol-%
aromatics. Present market requirements make refractory product streams such as light cycle oil particularly difficult to dispose of as commercially valuable products.
[0010] In one embodiment of the present invention, a highly aromatic, hydrogen deficient and substantially dealkylated hydrocarbon feedstock is introduced into a hydrocracking zone. The hydrocracking zone may contain one or more beds of the same or different catalyst. In one embodiment the preferred hydrocracking catalysts utilize amorphous bases or low-level zeolite bases combined with one or more Group VIII or Group VIB metal hydrogenating components. In another embodiment the hydrocracking zone contains a catalyst which comprises, in general, any crystalline zeolite cracking base upon which is deposited a minor proportion of a Group VIII
metal hydrogenating component. Additional hydrogenating components may be selected from Group VIB for incorporation with the zeolite base. The zeolite cracking bases are sometimes referred to in the art as molecular sieves and are usually composed of silica, alumina and one or more exchangeable cations such as sodium, magnesium, calcium, rare earth metals, etc. They are further characterized by crystal pores of relatively uniform diameter between 4 and 14 angstroms (10-10 meters). It s preferred to employ zeolites having a silica/alumina mole ratio between 3 and 12. Suitable zeolites found in nature include, for example, mordenite, stillbite, heulandite, ferrierite, dachiardite, chabazite, erionite and faujasite. Suitable synthetic zeolites include, for example, the B, X, Y and L crystal types, e.g., synthetic faujasite and mordenite. The preferred zeolites are those having crystal pore diameters between 8 and 12 angstroms (10-10 meters), wherein the silica/alumina mole ratio is 4 to 6. A prime example of a zeolite falling in the preferred group is synthetic Y molecular sieve.
100111 The natural occurring zeolites are normally found in a sodium form, an alkaline earth metal form, or mixed forms. The synthetic zeolites are nearly always prepared first in the sodium form. In any case, for use as a cracking base it is preferred that most or all of the original zeolitic monovalent metals be ion-exchanged with a polyvalent metal and/or with an ammonium salt followed by heating to decompose the ammonium ions associated with the zeolite, leaving in their place hydrogen ions and/or exchange sites which have actually been decationized by further removal of water. Hydrogen or "decationized" Y zeolites of this nature are more particularly described in US 3,130,006.
100121 Mixed polyvalent metal-hydrogen zeolites may be prepared by ion-exchanging first with ammonium salt, then partially back exchanging with a polyvalent metal salt and then calcining. In some cases, as in the case of synthetic mordenite, the hydrogen forms can be prepared by direct acid treatment of the alkali metal zeolites. The preferred cracking bases are those which are at least 10 percent, and preferably at least 20 percent, metal-cation-deficient, based on the initial ion-exchange capacity. A specifically desirable and stable class of zeolites are those wherein at least 20 percent of the ion exchange capacity is satisfied by hydrogen ions.
[00131 The active metals employed in the preferred hydrocracking catalysts of the present invention as hydrogenation components are those of Group VIII, i.e., iron, cobalt, nickel, ruthenium, rhodium, palladium, osmium, iridium and platinum. In addition to these metals, other promoters may also be employed in conjunction therewith, including the metals of Group VIB, e.g., molybdenum and tungsten. The amount of hydrogenating metal in the catalyst can vary within wide ranges. Broadly speaking, any amount between 0.05 percent and 30 percent by weight may be used. In the case of the noble metals, it is normally preferred to use 0.05 to 2 wt-%. The preferred method for incorporating the hydrogenating metal is to contact the zeolite base material with an aqueous solution of a suitable compound of the desired metal wherein the metal is present in a cationic form. Following addition of the selected hydrogenating metal or metals, the resulting catalyst powder is then filtered, dried, pelleted with added lubricants, binders or the like if desired, and calcined in air at temperatures of, e.g., 371 -648 C (700 -1200 F) in order to activate the catalyst and decompose ammonium ions. Alternatively, the zeolite component may first be pelleted, followed by the addition of the hydrogenating component and activation by calcining. The foregoing catalysts may be employed in undiluted form, or the powdered zeolite catalyst may be mixed and copelleted with other relatively less active catalysts, diluents or binders such as alumina, silica gel, silica-alumina cogels, activated clays and the like in proportions ranging between 5 and 90 wt-%. These diluents may be employed as such or they may contain a minor proportion of' an added hydrogenating metal such as a Group VIB and/or Group VIII metal.
[00141 Additional metal promoted hydrocracking catalysts may also be utilized in the process of the present invention which comprises, for example, aluminophosphate molecular sieves, crystalline chromosilicates and other crystalline silicates. Crystalline chromosilicates are more fully described in US 4,363,718 (Klotz).
[0015] The hydrocracking of the hydrocarbonaceous feedstock in contact with a hydrocracking catalyst is conducted in the presence of hydrogen and preferably at hydrocracking reactor conditions which include a temperature from 260 C (500 F) to 426 C
(800 F), a pressure from 7.0 MPa (1000 psig) to 10.5 MPa (1500 psig), a liquid hourly space velocity (LHSV) from 0.1 to 30 hr 1, and a hydrogen circulation rate from 2000 (337 normal m3/m3) to 25,000 (4200 normal m3/m3) standard cubic feet per barrel.
[0016] The resulting effluent from the hydrocracking zone is preferably contacted with an aqueous stream to dissolve any ammonium salts and partially condensed, and then introduced into a high pressure vapor-liquid separator operated at a pressure substantially equal to the hydrocracking zone and a temperature in the range from 38 C (100 F) to 71 C
(160 F). An aqueous stream is recovered from the vapor-liquid separator. A hydrogen-rich gaseous stream is removed from the vapor-liquid separator to provide at least a majority and preferably all of the hydrogen introduced into the hydrocracking zone.
[0017] In one embodiment of the present invention, a distillate hydrocarbon boiling at a temperature greater than 149 C (300 F) is introduced into a desulfurization reaction zone together with a hydrogen-rich make-up stream at desulfurization reaction conditions. Preferred desulfurization reaction conditions include a temperature from 260 C (500 F) to 426 C (800 F), a pressure from 7.0 MPa (1000 psig) to 10.5 MPa (1500 psig), and a liquid hourly space velocity from 0.1 hr-I to 10 hr"1.
[00181 Suitable desulfurization catalysts for use in the present invention are any known convention desulfurization catalysts and include those which are comprised of at least one Group VIII metal, preferably iron, cobalt and nickel, more preferably cobalt and/or nickel and at least one Group VI metal, preferably molybdenum and tungsten, on a high surface area support material, preferably alumina. Other suitable desulfurization catalysts include zeolitic catalysts, as well as noble metal catalysts where the noble metal is selected from palladium and platinum. It is within the scope of the present invention that more than one type of desulfurization catalyst be used in the same reaction vessel. Two or more catalyst beds and one or more quench points may be utilized in the reaction vessel or vessels. The Group VIII metal is typically present in an amount ranging from 2 to 20 wt- ro, preferably from 4 to 12 wt-%. The Group VI
metal will typically be present in an amount ranging from I to 25 wt-%, preferably from 2 to 25 wt-%.
[0019] The resulting effluent from the desulfurization reaction zone is contacted with an aqueous stream and partially condensed, and then introduced into the previously described high pressure vapor-liquid separator.
[0020] Fresh make-up hydrogen is directly introduced into the desulfurization reaction zone in order to supply high purity hydrogen to maximize the activity of the desulfurization catalyst. In a preferred embodiment, at least a majority of the hydrogen-rich recycle gas which is recovered in the high pressure vapor-liquid separator is recycled to the hydrocracking zone and more preferably essentially all of the hydrogen-rich recycle gas is recycled to the hydrocracking zone.
DETAILED DESCRIPTION OF THE DRAWING
[0021] In the drawing, the process of the present invention is illustrated by means of a simplified schematic flow diagram in which such details as pumps, instrumentation, heat-exchange and heat-recovery circuits, compressors and similar hardware have been deleted as being non-essential to an understanding of the techniques involved. The use of such miscellaneous equipment is well within the purview of one skilled in the art.
[0022] Referring now to the drawing, a distillate hydrocarbon feedstock is introduced into the process via line 3 and is admixed with a fresh make-up hydrogen stream which is introduced via line 1. The resulting admixture is transported via line 4 and introduced into hydrodesulfurization reaction zone 5. A resulting effluent from hydrodesulfurization reaction zone 5 is carried via lines 6 and 8 and introduced into cold high pressure separator 9. A hydrogen-rich gaseous stream is removed from cold high pressure separator 9 via line 10 and introduced into compressor 11. A
resulting compressed hydrogen-rich gaseous stream is transported via lines 12 and 14 and admixed with a light cycle oil feedstock provided via line 16 and the resulting admixture is transported via line 2 and introduced into hydrocracking zone 17. A resulting effluent from hydrocracking zone 17 is transported via line 7 and 8 and introduced into cold high pressure separator 9. Another hydrogen-rich gaseous stream is introduced via line 15 into hydrodesulfurization reaction zone 5. Yet another hydrogen-rich gaseous stream is introduced via line 13 into hydrocracking zorre 17 to provide quench. A hydrocarbonaceous liquid stream is removed from cold high pressure separator 9 via line 18 and introduced into low pressure flash drum 19. A gaseous stream contaiiiing hydrogen and low boiling gaseous hydrocarbons are removed from low pressure flash drum 19 via line 20 and recovered. A liquid hydrocarbonaceous stream is removed from low pressure flash drum 19 via line 21 and introduced into fractionation zone 22. A normally gaseous hydrocarbonaceous stream is removed from fractionation zone 22 via line 23 and recovered. A high octane naphtha stream is removed from fractionation zone 22 via line 24 and recovered. The high octane naphtha stream may be recovered from fractionation zone 22 in any convenient manner and is preferably a sidecut as shown. A low sulfur diesel stream is removed from fractionation zone 22 via line 25 and recovered.
[0023] The process of the present invention is further demonstrated by the following illustrative embodiment. This illustrative embodiment is, however, not presented to unduly limit the process of this invention, but to further illustrate the advantage of the hereinabove-described embodiment. The following data were not obtained by the actual performance of the present invention but are considered prospective and reasonably illustrative of the expected performance of the invention.
ILLUSTRATIVE EMBODIMENT
[0024] A blend of straight run diesel and light coker gas oil (LCGO) in an amount of 4372 m'/day (27,500 barrels per day) and having the characteristics presented in Table 1 is introduced along with a high purity make-up hydrogen stream into a hydrodesulfurization reaction zone operated at hydrodesulfurization reaction conditions summarized and presented in Table 2.
[0025] A stream of FCC light cycle oil (LCO) in an amount of 3657 m'/day (23,000 barrels per day) and having the characteristics presented in Table 1 is introduced into a hydrocracking zone operated at hydrocracking conditions summarized and presented in Table 2.
[0026] The resulting effluent from the hydrodesulfurization reaction zone and 'the hydrocracking zone is cooled, partially condensed and introduced into a cold, high pressure vapor liquid separator operated at a pressure of 9.7 MPa (1400 psig) and a temperature of 43 C (110 F) to produce a hydrogen-rich recycle gas stream and a liquid hydrocarbonaceous stream. The hydrogen-rich recycle gas stream is recycled to the hydrocracking zone and the liquid hydrocarbonaceous stream is fractionated to produce a high octane naphtha stream (gasoline) boiling in the range of 88 C (185 F) to 193 C (380 F), in the amount of 2145 m3/day (13,500 barrels per day) and having an octane number of 87, and a diesel stream boiling at a temperature greater than 193 C (380 F) in an amount of 5500 m3/day (34,500 barrels per day) and having a sulfur content of <10 ppm and a cetane Index of 46.
Diesel/LCGO Light Cycle Oil Specific gravity 0.87 0.96 Total sulfur, wt-% 2 1 Total nitrogen, weight ppm 725 900 Distillation, C ( F) IBP 146 (295) 215 (420) 10% 222 (432) 263 (506) 50% 278 (543) 304 (580) 90% 336 (638) 349 (660) EP 390 (735) 371 (700) Hydrodesulfurization Hydrocracking Pressure, MPa (psig) 9.7 (1400) 9.7 (1400) Temperature, C ( F) 371 (700) 371 (700) [00271 The foregoing description, drawing and illustrative embodiment clearly illustrate the advantages encompassed by the process of the present invention and the benefits to be afforded with the use thereof.
Claims (10)
1. An integrated process for the production of low sulfur diesel and high octane naphtha which process comprises:
a) reacting a distillate hydrocarbon feedstock having a boiling range greater than 149°C
(300°F) and a make-up hydrogen rich gaseous stream in a hydrodesulfurization reaction zone containing desulfurization catalyst to produce a hydrodesulfurization reaction zone effluent stream containing hydrocarbons having a reduced concentration of sulfur;
b) reacting a highly aromatic, substantially dealkylated hydrocarbon feedstock in a hydrocracking zone containing hydrocracking catalyst to produce a hydrocracking zone effluent stream comprising monocyclic aromatic compounds boiling in the naphtha range;
c) admixing the hydrodesulfurization zone effluent stream and the hydrocracking zone effluent stream to provide a resulting admixture stream; and d) separating the resulting admixture from step c) to produce a hydrogen-rich gaseous stream, a low sulfur diesel stream and a high octane naphtha stream.
a) reacting a distillate hydrocarbon feedstock having a boiling range greater than 149°C
(300°F) and a make-up hydrogen rich gaseous stream in a hydrodesulfurization reaction zone containing desulfurization catalyst to produce a hydrodesulfurization reaction zone effluent stream containing hydrocarbons having a reduced concentration of sulfur;
b) reacting a highly aromatic, substantially dealkylated hydrocarbon feedstock in a hydrocracking zone containing hydrocracking catalyst to produce a hydrocracking zone effluent stream comprising monocyclic aromatic compounds boiling in the naphtha range;
c) admixing the hydrodesulfurization zone effluent stream and the hydrocracking zone effluent stream to provide a resulting admixture stream; and d) separating the resulting admixture from step c) to produce a hydrogen-rich gaseous stream, a low sulfur diesel stream and a high octane naphtha stream.
2. The process of claim 1 wherein the resulting admixture stream of the hydrodesulfurization reaction zone effluent stream and hydrocracking zone effluent stream is introduced into a high pressure vapor-liquid separator to produce the hydrogen rich gaseous stream and an admixture comprising the liquid hydrocarbons from the hydrodesulfurization reaction zone effluent and hydrocracking zone effluent streams.
3. The process of claim 1 wherein a majority of the hydrogen rich gaseous stream from step d) is recycled to the hydrocracking zone, the hydrogen rich gaseous stream comprising hydrogen from both the hydrodesulfurization zone effluent stream and the hydrocracking zone effluent stream.
4. The process of claim 1 wherein the highly aromatic, substantially dealkylated hydrocarbon feedstock comprises hydrocarbons boiling in the range from 149°C (300°F) to 343°C (650°F).
5. The process of claim 1 wherein the distillate hydrocarbon feedstock boils in the range from 149°C (300°F) to 399°C (750°F), having reduced naphtha range hydrocarbons.
6. The process of claim 1 wherein the hydrodesulfurization reaction zone is operated at conditions including a pressure from 7.0 MPa (1000 psig) to 10.5 MPa (1500 psig) and a temperature from 260°C (500°F) to 426°C (800°F).
7. The process of claim 1 wherein the highly aromatic, substantially dealkylated hydrocarbon feedstock comprises light cycle oil.
8. The process of claim 1 wherein the hydrocracking zone is operated at conditions including a pressure from 7.0 MPa (1000 psig) to 10.5 MPa (1500 psig) and a temperature from 260°C (500°F) to 426°C (800°F).
9. The process of claim 1 wherein step (d) is performed in at least one fractionation zone where the high octane naphtha stream is separated from the hydrocarbonaceous content of the admixed hydrodesulfurization reaction zone effluent stream and hydrocracking zone effluent stream.
10. The process of claim 1 wherein essentially all of the hydrogen-rich gaseous stream from step (d) is recycled to the hydrocracking zone.
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