GB2048922A - Dewaxing Aid for the Solvent Dewaxing of Hydrocarbon Oils - Google Patents
Dewaxing Aid for the Solvent Dewaxing of Hydrocarbon Oils Download PDFInfo
- Publication number
- GB2048922A GB2048922A GB8014889A GB8014889A GB2048922A GB 2048922 A GB2048922 A GB 2048922A GB 8014889 A GB8014889 A GB 8014889A GB 8014889 A GB8014889 A GB 8014889A GB 2048922 A GB2048922 A GB 2048922A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dewaxing
- oil
- solvent
- wax
- aid
- 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
- 239000002904 solvent Substances 0.000 title claims abstract description 45
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 14
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 14
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 12
- 239000003921 oil Substances 0.000 title claims description 54
- 238000000034 method Methods 0.000 claims abstract description 25
- XDOFQFKRPWOURC-UHFFFAOYSA-N 16-methylheptadecanoic acid Chemical compound CC(C)CCCCCCCCCCCCCCC(O)=O XDOFQFKRPWOURC-UHFFFAOYSA-N 0.000 claims abstract description 18
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 15
- 229920000642 polymer Polymers 0.000 claims abstract description 9
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 8
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims abstract description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 7
- 150000002148 esters Chemical class 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 29
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 22
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 21
- 125000004432 carbon atom Chemical group C* 0.000 claims description 14
- 150000002576 ketones Chemical class 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 claims description 7
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 6
- 239000010687 lubricating oil Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 abstract description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 9
- 125000001931 aliphatic group Chemical group 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 239000001993 wax Substances 0.000 description 32
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 30
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 22
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 12
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 12
- 239000001294 propane Substances 0.000 description 11
- 239000000243 solution Substances 0.000 description 10
- 239000013078 crystal Substances 0.000 description 8
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 6
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 6
- 238000009835 boiling Methods 0.000 description 5
- -1 etc. Chemical class 0.000 description 5
- 229920006222 acrylic ester polymer Polymers 0.000 description 4
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 3
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 3
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000001273 butane Substances 0.000 description 2
- 229940043265 methyl isobutyl ketone Drugs 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 2
- XNLICIUVMPYHGG-UHFFFAOYSA-N pentan-2-one Chemical compound CCCC(C)=O XNLICIUVMPYHGG-UHFFFAOYSA-N 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- ZFPGARUNNKGOBB-UHFFFAOYSA-N 1-Ethyl-2-pyrrolidinone Chemical compound CCN1CCCC1=O ZFPGARUNNKGOBB-UHFFFAOYSA-N 0.000 description 1
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 1
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 1
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000007859 condensation product Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 239000012456 homogeneous solution Substances 0.000 description 1
- 229940059904 light mineral oil Drugs 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 150000002790 naphthalenes Chemical class 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 239000005076 polymer ester Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- FHYUCVWDMABHHH-UHFFFAOYSA-N toluene;1,2-xylene Chemical group CC1=CC=CC=C1.CC1=CC=CC=C1C FHYUCVWDMABHHH-UHFFFAOYSA-N 0.000 description 1
- 238000005292 vacuum distillation Methods 0.000 description 1
- 239000008096 xylene Substances 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
- C10G73/00—Recovery or refining of mineral waxes, e.g. montan wax
- C10G73/02—Recovery of petroleum waxes from hydrocarbon oils; Dewaxing of hydrocarbon oils
- C10G73/04—Recovery of petroleum waxes from hydrocarbon oils; Dewaxing of hydrocarbon oils with the use of filter aids
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)
- Lubricants (AREA)
Abstract
The dewaxing aid comprises: (a) lithium isostearate and (b) a polymer of an ester of at least one aliphatic (suitably C6-C30) alcohol with methacrylic acid or acrylic acid, the polymer having an average molecular weight of from 300,000 to 2,000,000. Preferably the weight ratio of component (a) to (b) is from 1/1 00 to 100/1, e.g. 1/10 to 10/1. When used in a solvent dewaxing process, increased filtering rates are obtained during the separation of the wax from the oil solution, compared with the use of polymer (b) alone. Components (a) and (b) may be added together, or separately, to the hydrocarbon oil, preferably in solution in a suitable solvent.
Description
SPECIFICATION
Lithium Isostearate/Acrylic Ester Polymer Dewaxing Aid and Hydrocarbon Oils Solvent Dewaxing
Process Using It
This invention relates to a dewaxing aid useful in solvent dewaxing processes. More particularly, this invention relates to an improved dewaxing aid useful in solvent dewaxing processes wherein the improvement comprises a dewaxing aid comprising a mixture of (a) lithium isostearate and (b) an acrylic ester polymer. Still more particularly this invention relates to an improved dewaxing aid for solvent dewaxing processes wherein the dewaxing aid comprises a mixture of (a) lithium isostearate and (b) a polymer of an ester of at least one aliphatic alcohol with methacrylic acid or acrylic acid having an average molecular weight ranging between about 300,000 to 2,000,000.
Description of the Prior Art
Waxes in wax-containing hydrocarbon oils are removed therefrom by chilling the oil to precipitate out the wax and then separating the solid wax particles from the dewaxed oil by filtration or centrifugation. Industrial dewaxing processes include press dewaxing processes wherein the waxcontaining oil, in the absence of solvent, is chilled to crystallize out the wax particles which are then pressed out by a filter. In general, only light hydrocarbon oil fractions (paraffinic fractions) obtained by vacuum distillation are treated by press dewaxing processes due to viscosity limitations. More widely used are solvent dewaxing processes wherein a waxy oil is mixed with solvent and then chilled to precipitate the wax as tiny particles or crystals thereby forming a slurry comprising solid wax particles and a solution of dewaxed oil containing dewaxing solvent.The slurry is then fed to a wax filter wherein the wax is removed from the dewaxed oil and dewaxing solvent. Solvent dewaxing processes are used for heavier oil fractions such as lubricating oil fractions and bright stocks. Typical dewaxing solvents include low boiling point, normally gaseous autorefrigerative hydrocarbons such as propane, propylene, butane, pentane, etc., ketones such as acetone and MEK, MIBK, and mixtures thereof, aromatic hydrocarbons such as benzene, toluene xylene as well as mixtures of ketones and aromatic hydrocarbons such as MEK/toluene and acetone/benzene and mixtures of ketones with autorefrigerants such as acetone/propylene.
One of the factors tending to limit the capacity of a solvent dewaxing plant is the rate of wax filtration from the dewaxed oil, which in turn is strongly influenced by the crystal structure of the precipitated wax. Although the crystal structure of the precipitated wax is influenced by various operating conditions in the dewaxing process, for any given feed, it is most strongly influenced by the chilling conditions. The size and crystal structure of the precipitated wax, occlusion of oil in the wax crystal and the condition of the oil left in the crystal are extremely varied and depend on the wax composition and precipitation conditions. These conditions also affect the filtration rate of the dewaxed oil from the wax and the yield of dewaxed oil.In some cases, most notably when the waxy oil is a bright stock, the wax crystals are of an extremely fine size and not all are separated by filtration, but some leave the filter with the dewaxed oil component which creates an objectionable haze in the oil.
One way of increasing the filtration rate and minimizing haze formation is to add a dewaxing aid to the wax-containing oil. Well-known in the art are dewaxingaids such as a-olefin copolymers, mixtures of materials such as a mixture of (a) an ethylene-vinyl acetate copolymer and (b) an unsaturated ester of an aliphatic alcohol having from 2 to 20 carbon atoms with acrylic or methacrylic acid, as well as polymeric dewaxing aids comprising condensation products of chlorinated paraffins and naphthalenes alone or mixed with acrylic ester polymers. However, in the case of heavy stocks these dewaxing aids are not too efficient, thus requiring a relatively high concentration of the dewaxing aid in the oil. This is especially true when a heavy oil raffinate or a bright stock is solvent dewaxed.
When these oils are solvent dewaxed, a portion of the wax is precipitated as crystals so fine that they pass through filter cloths, thereby creating a haze in the dewaxed oil which greatly reduces the commercial values of same. Also, because of the presence of so many fine particles of wax, the filter rate of the dewaxed oil tends to be lower than that obtained with lighter lube oil stocks.
Haze may also appear when the dewaxed oil is allowed to stand at room temperature for a long time. In order to prevent the occurrence of haze, it is sometimes necessary to filter the dewaxed oil through a filter of sintered metal or polyvinyl alcohol after the dewaxing step. However, these process steps are complicated and the dewaxing process becomes economically disadvantageous. Therefore, there is a need for efficient dewaxing aids, particularly for use with heavy stocks.
Summary of the Invention
Accordingly, therefore, it has now been found that an improvement results in processes for solvent dewaxing wax-containing hydrocarbon oil employing dewaxing aids, if the dewaxing aid comprises a mixture of (a) lithium isostearate and (b) a polymer ester of at least one aliphatic alcohol with methacrylic acid or acrylic acid having a number average molecular weight ranging from between about 300,000 to 2,000,000. This combination dewaxing aid results in increased wax filtration rates compared to that obtained using the acrylic polymer alone.
Components (a) and (b) constituting the dewaxing aid of this invention will be used in a weight ratio to each other ranging from about 1/100 to 100/1 and preferably from 1/10 to 10/1 of (a)/(b). This dewaxing aid is added to the waxy oil feed in an amount ranging from about 0.01 to 0.50 wt. % and preferably from about 0.10 to 0.20 wt. % of the oil. It has been found to be advantageous to prepare separate solutions of components (a) and (b) of the dewaxing aid by dissolving each component in a mineral oil or suitable solvent such as toluene, benzene, propane, methylene chloride and the like. The separate solutions of (a) and (b) can then be added to the wax-containing hydrocarbon oil or they can be combined and the combined solutions added to the wax-containing hydrocarbon oil.
The lithium isostearate used as component (a) in this invention was prepared by reacting equimolar quantities of lithium hydroxide and isostearic acid. Thus, a solution of 3 wt. % lithium hydroxide in water was mixed with a solution of 1 5 wt. % isostearic acid in ethanol, at room temperature and under agitation. A jelly-like precipitate of lithium isostearate was formed within a short time. The lithium isostearate precipitate was washed with water and dried in a laboratory oven at a temperature of about 1 050C. The dry lithium isostearate was then dissolved in toluene by heating for from about 3 to 5 hours at a temperature of about 950C to form a 2-3 wt.% solution of lithium isostearate in toluene.
The polymer of the ester of an aliphatic alcohol with methacrylic or acrylic acid used as component (b) in the present invention is a polymer of an ester of at least one aliphatic alcohol having from about 6 to 30 carbon atoms and preferably from about 10 to 20 carbon atoms, with methacrylic or acrylic acid. It has been found that aliphatic alcohols having 5 to less carbon atoms or having 31 or more carbon atoms result in polymers which do not give the desired dewaxing effect.Illustrative but non-limiting aliphatic alcohol compositions suitable for use in the instant invention include a mixture of (a) 0 to 30 wt. % of an alcohol having 10 carbon atoms, (b) about 10 to 40 wt. % of an alcohol having 12 carbon atoms, (c) about 10 to 40 wt. % of an alcohol having 14 carbon atoms, (d) about 10 to 40 wt. % of an alcohol having 1 6 carbon atoms, (e) about 10 to 40 wt. % of an alcohol having 1 8 carbon atoms, and (f) about 0 to 30 wt. % of an alcohol having 20 carbon atoms.
As hereinbefore stated, supra, the ester polymer (b) will have a number average molecular weight ranging from about 300,000 to 2,000,000 and preferably from about 400,000 to 1,500,000. It has been found that known copolymers of aliphatic alcohols with methacrylic or acrylic acid having an average molecular weight of less than about 300,000 or more than about 2,000,000 do not prevent haze formation and do not yield increases in the amount of dewaxed oil or dewaxing rate. Further, those having molecular weight less than about 5,000 have no effect as dewaxing aids while those having molecular weights exceeding 3,000,000 inhibit the dewaxing effect due to poor solvent solubility. One commercially available acrylic ester polymer that has been found to be useful as component (b) of this invention is Acryloid-1 50 available from the Rohm and Haas Company.
The dewaxing solvent that is used inthe present invention is not particularly critical, provided that the dewaxing aid stays in solution. Thus, any of the well-known dewaxing solvents can be used. For example, there may be used at least one member selected from linear hydrocarbons having 2 to 10 carbon atoms in the molecular, such as ethane, propane, butane, pentane, hexane, octane, ethyiene, propylene, butylene, pentene, hexene and octene, or a mixture of at least one member selected from ketones having from 3 to 6 carbon atoms, such as acetone, dimethyl ketone, methylethyl ketone, methylpropyl ketone and methylisobutyl ketone with at least one member selected from an aromatic hydrocarbon such as benzene, xylene or toluene, such as methylethyl ketone/toluene or methylisobutyl ketone/toluene. Also useful are halogenated hydrocarbons such as methylene chloride.Further, Nalkylpyrrolidones such as N-methylpyrrolidone and N-ethyl-pyrrolidone may be used as the dewaxing solvent. Still further, mixtures of autorefrigerative solvents and ketones can be used as the dewaxing solvent, such as a mixture of acetone and propylene. Solvents which have been found to be especially preferred for practicing the process of the present invention include propane, other autorefrigerative solvents, toluene, mixtures of a ketone and an aromatic hydrocarbon such as MEK/toluene, methylene chloride and mixtures of acetone and methylene chloride.
Any waxy petroleum oil stock or distillate fraction thereof may be dewaxed employing the dewaxing aid of this invention, although heavy feedstocks are preferred. Illustrative but non-limiting examples of such stocks are (a) distillate fractions that have a boiling range within the broad range of from about 250 to 7000C, with preferred stocks including lubricating oil and specialty oil fractions boiling within the range of from between about 300 and 6500C and (b) bright stocks and deasphalted resids having an initial boiling point above about 4250C. Additionally, any of these feeds may be hydrocracked prior to distilling or deasphalting. These may come from any source such as paraffinic crudes obtained from Aramco, Kuwait, the Panhandle, North Louisiana, etc., naphthenic crudes, such as Tia Juana, Coastal crudes, etc., as well as the relatively heavy feedstocks such as bright stocks having a boiling range of 565+0C and synthetic feedstocks derived from Athabasca tar sands, Cold
Lake crude, coal, etc.
Description of the Preferred Embodiments
In a preferred embodiment of the process of this invention, a solution of dewaxing aid comprising components (a) and (b) dissolved in an appropriate solvent such as a light heating oil or a light-mineral oil fraction is mixed into the wax-containing oil and the mixture heated to a temperature higher than the cloud point of the oil (about 50 to 1 200C). This mixture is introduced, along with the dewaxing solvent, into a chilling zone and chilled to a temperature necessary to yield the desired pour point for the resulting dewaxed oil. The chilling produces a slurry comprising dewaxed oil and solvent along with solid particles of wax which contain the dewaxing aid. This slurry is then sent to a wax filter to separate the dewaxed oil and solvent from the wax particles.The dewaxing temperature or temperature to which the slurry is chilled varies depending on the feed and conditions. In general, this temperature will range from about 0 to about -500C. In the case where the dewaxing solvent comprises a mixture of a ketone and an aromatic hydrocarbon, such as methylethyl ketone/toluene, the dewaxing temperature will range from about -10 to about -300C. Where propane is used as the dewaxing solvent, the dewaxing temperature will generally be from about -20 to about 40C C. Preferred dewaxing solvents used in the process of this invention include propane, other autorefrigerative solvents, a mixture of a ketone and an aromatic hydrocarbon as well as a mixture of a ketone and methylene chloride.The ratio of solvent to waxy oil would generally range from about 0.5 to 10 and preferably from about 2 to 7, by volume. The optimum amount of dewaxing solvent employed is of course determined by the wax content of the oil, viscosity, pretreatment and dewaxing conditions.
The invention will be more apparent from the Example set forth below.
Example
A bright stock having a viscosity of 2500 SUS at 1000F obtained from a light Arabian crude oil was charged into an autoclave, along with dewaxing aid. Propane was then added in the amounts shown in Table 1. The dewaxing aid was added to the bright stock as a 3 wt. % solution in a light heating oil. The mixture of bright stock, dewaxing aid and propane was heated in the autoclave to 600C to form a homogeneous solution and then prechilled to 1 60C via indirect, external heat exchange under agitation, at a chilling rate of 60C per minute. The propane solvent was then allowed to evaporate which chilled the mixture to -340C at a chilling rate of 2.80C/min. to form a slurry of dewaxed oil, solvent and solid particles of wax.After the chilling operation, the slurry was fed to a wax filter where filtration was conducted at a temperature of -34.40C and at a filtration pressure differential of 34 KPA and the filtration rate was determined. The results are shown in Table I.
Table I
Propane Dewaxing of Arabian LT. 2500 Bright Stock with Lithium Isostearate/MethacrylatesEster Dewaxing Aid
Run No. 2 3
Dewaxing Aid Acryloid- 150 Lithium isostear a te/A cryloid- 150
amount, wt. % on feed 0.10 0.01/0.10
Propane dilution, vol. on feed 3.14 2.70
Feed Filtration Rate, m3/m2 day 4.6 6.0
Wax Cake liquids/solids ratio, weight basis 2.4 2.8
Thus, the data show that the feed filter rate for the oil containing the Acryloid-1 50 alone but no lithium isostearate was 4.6, whereas when 100 wt. ppm (on waxy oil feed) of lithium isostearate was present in the dewaxing aid, the feed filter rate was 6.0, thus yielding a 30% improvement in feed filter rate.
Claims (11)
1. A dewaxing aid suitable for use in a solvent dewaxing process for dewaxing a waxy hydrocarbon oil comprising: (a) lithium isostearate, and (b) a polymer of an ester of at least one aliphatic alcohol with methacrylic or acrylic acid having an average molecular weight in the range of from 300,000 to 2,000,000.
2. A dewaxing aid according to claim 1 in which the weight ratio of component (a) to component (b) is in the range of from 1/100 to 100/1.
3. A dewaxing aid according to claim 2 in which the said weight ratio is in the range of from 1/10 to 10/1.
4. A dewaxing aid according to any one of claims 1 to 3 substantially as hereinbefore described.
5. A solvent dewaxing process for dewaxing a waxy hydrocarbon oil comprising forming a mixture comprising the waxy hydrocarbon oil, a dewaxing solvent and a dewaxing aid in accordance with any one of claims 1 to 4, chilling the said mixture to form a slurry comprising solid particles of wax and a solution of dewaxed oil and dewaxing solvent, and separating wax from the dewaxed oil solution.
6. A process according to claim 5 in which the components (a) and (b) of the dewaxing aid are added either separately or together to form the said mixture.
7. A process according to claim 5 or claim 6 in which the dewaxing aid is provided in the mixture
in an amount in the range of from 0.01 to 0.50 wt.% of the waxy oil.
8. A process according to any one of claims 5 to 7 in which the dewaxing solvent is selected from: (i) one or more autorefrigerative solvents; (ii) mixtures of one or more aromatic hydrocarbons with at least one ketone having from 3 to 6 carbon atoms; (iii) methylene chloride; and (iv) a mixture of acetone and methylene chloride.
9. A process according to any one of claims 5 to 8 in which the waxy hydrocarbon oil is a natural or synthetic lube oil fraction.
10. A process according to any one of claims 5 to 9 substantially as hereinbefore described.
11. Dewaxed oil or dewaxed oil solution and/or wax separated by a process according to any one of claims 5 to 10.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US3549779A | 1979-05-03 | 1979-05-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2048922A true GB2048922A (en) | 1980-12-17 |
GB2048922B GB2048922B (en) | 1983-03-30 |
Family
ID=21883075
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8014889A Expired GB2048922B (en) | 1979-05-03 | 1980-05-02 | Dewaxing aid for the solvent dewaxing of hydrocarbon oils |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS55149387A (en) |
CA (1) | CA1147689A (en) |
FR (1) | FR2455627A1 (en) |
GB (1) | GB2048922B (en) |
IT (1) | IT1209215B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2197661A (en) * | 1986-11-21 | 1988-05-25 | Exxon Research Engineering Co | Solvent dewaxing using combination poly (n-c24)alkylmethacrylate-poly (c8-c20)alkyl meth-acrylate dewaxing aid |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR48671E (en) * | 1937-05-20 | 1938-05-23 | Texaco Development Corp | Mineral Oil Dewaxing Improvements |
FR1094461A (en) * | 1953-11-20 | 1955-05-20 | Exxon Standard Sa | Composition improving dewaxing operations |
NL141571B (en) * | 1962-08-06 | 1974-03-15 | Shell Int Research | PROCESS FOR DEPARAFINING A PARAFFIN CONTAINING HYDROCARBON OIL. |
FR1565493A (en) * | 1968-02-12 | 1969-05-02 |
-
1980
- 1980-04-30 CA CA000350909A patent/CA1147689A/en not_active Expired
- 1980-04-30 FR FR8009882A patent/FR2455627A1/en active Granted
- 1980-05-02 IT IT8021785A patent/IT1209215B/en active
- 1980-05-02 GB GB8014889A patent/GB2048922B/en not_active Expired
- 1980-05-02 JP JP5803880A patent/JPS55149387A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2197661A (en) * | 1986-11-21 | 1988-05-25 | Exxon Research Engineering Co | Solvent dewaxing using combination poly (n-c24)alkylmethacrylate-poly (c8-c20)alkyl meth-acrylate dewaxing aid |
GB2197661B (en) * | 1986-11-21 | 1991-07-03 | Exxon Research Engineering Co | Solvent-dewaxing process using combination dewaxing aid of (c24) alkylmethacrylate polymer and poly (c8-20) alkyl(meth-)acrylate polymer. |
Also Published As
Publication number | Publication date |
---|---|
JPH0142994B2 (en) | 1989-09-18 |
IT8021785A0 (en) | 1980-05-02 |
IT1209215B (en) | 1989-07-16 |
JPS55149387A (en) | 1980-11-20 |
FR2455627B1 (en) | 1985-01-04 |
FR2455627A1 (en) | 1980-11-28 |
GB2048922B (en) | 1983-03-30 |
CA1147689A (en) | 1983-06-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |