US4748288A
Expired / Lapsed
US
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Process for the separation of solvents from hydrocarbons dissolved in the solvents
Assignee: Shell USA Inc
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Filing: 1986-06-23
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Granted: 1988-05-31
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Expires: 2006-06-23
Abstract
Abstract The invention is a process for the separation of solvents from hydrocarbons dissolved in the solvents which comprises contacting at elevated pressure a feed solution comprising hydrocarbons dissolved in an aromatic solvent and a polar aliphatic solvent with one side of a dense membrane which is substantially impermeable to the hydrocarbons, and which membrane comprises a layer of a halogen-substituted silicon compound, and recovering the solvents from the other side of the membrane.
Inventors
- 👤 Johan G. A. Bitter
- 👤 Johannes P. Haan
- 👤 Hendrik C. Rijkens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:13
CPC Classifications
C; C10; C10G; C10G31/00; C10G31/11; B; B01; B01D; B01D69/00; B01D69/12; B01D69/122; B01D71/00; B01D71/06; B01D71/70; C10G21/00; C10G21/28
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
151 words
A process for the recovery of a solvent mixture of an aromatic solvent and a polar aliphatic solvent from hydrocarbons dissolved in the solvent mixture which process comprises contacting at elevated pressure a feed solution comprising hydrocarbons dissolved in the solvent mixture with one side of a dense membrane which is substantially impermeable to the hydrocarbons and which membrane comprises a layer of a halogen-substituted silicon compound having a thickness from about 0.1 to about 100 μm and comprising units according to the general formula: ##STR2## wherein R 1 is selected from the group consisting of halogen, halogensubstituted alkyl, halogen-substituted aryl, and halogen-substituted arylalkyl moieties, R 2 is selected from the group consisting of hydrogen, halogen, alkyl, aryl, arylalkyl, halogen-substituted alkyl, halogen-substituted aryl, and halogen-substituted arylalkyl moieties, passing the solvent mixture through the membrane, and recovering the solvent mixture substantially free of the hydrocarbons on the other side of the membrane.
Claim 2
Dependent Claim
151 words
A process for the recovery of a solvent mixture of an aromatic solvent and a polar aliphatic solvent from hydrocarbons dissolved in the solvent mixture which process comprises contacting at elevated pressure a feed solution comprising hydrocarbons dissolved in the solvent mixture with one side of a dense membrane which is substantially impermeable to the hydrocarbons and which membrane comprises a layer of a halogen-substituted silicon compound having a thickness from about 0.1 to about 100 μm and comprising units according to the general formula: ##STR2## wherein R 1 is selected from the group consisting of halogen, halogensubstituted alkyl, halogen-substituted aryl, and halogen-substituted arylalkyl moieties, R 2 is selected from the group consisting of hydrogen, halogen, alkyl, aryl, arylalkyl, halogen-substituted alkyl, halogen-substituted aryl, and halogen-substituted arylalkyl moieties, passing the solvent mixture through the membrane, and recovering the solvent mixture substantially free of the hydrocarbons on the other side of the membrane.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the membrane comprises halogen-substituted alkyl moieties.
Claim 4
Dependent Claim
13 words
The process of claim 2 wherein R 1 is a 3,3,3-trihalogen propyl moiety.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the membrane comprises fluorine-substituted moieties.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein R 2 is a methyl group.
Claim 7
Dependent Claim
20 words
The process of claim 1 wherein the membrane comprises a copolymer of a halogen-substituted silicon compound and an elastomeric prepolymer.
Claim 8
Dependent Claim
24 words
The process of claim 1 wherein the membrane layer of a halogen-substituted silicon compound has a thickness from about 1 to about 10 μm.
Claim 9
Dependent Claim
26 words
The process of claim 1 wherein the membrane layer of a halogen-substituted silicon compound is free of filler and is supported by a porous supporting layer.
Claim 10
Dependent Claim
30 words
The process of claim 1 wherein the feed solution has been obtained by subjecting an hydrocarbon oil to a dewaxing treatment with the aromatic solvent and the polar aliphatic solvent.
Claim 11
Dependent Claim
23 words
The process of claim 1 wherein the weight ratio of solvents:dissolved hydrocarbons in the feed solution is from about 0.5 to about 5.
Claim 12
Dependent Claim
23 words
The process of claim 1 wherein the weight ratio of solvents:dissolved hydrocarbons in the feed solution is from about 1 to about 3.
Claim 13
Dependent Claim
27 words
The process of claim 1 wherein the weight ratio in the feed solution of aromatic solvent to polar aliphatic solvent is from about 0.1 to about 10.
Claim 14
Dependent Claim
27 words
The process of claim 1 wherein the weight ration in the feed solution of aromatic solvent to polar aliphatic solvent is from about 0.5 to about 3.
Claim 15
Dependent Claim
11 words
The process of claim 1 wherein the aromatic solvent is toluene.
Claim 16
Dependent Claim
14 words
The process of claim 1 wherein the polar aliphatic solvent is methyl ethyl ketone.
Claim 17
Dependent Claim
37 words
The process of claim 1 wherein the applied pressure differential between the side of the membrane contacted with the feed solution and and the other side of the membrane is from about 2 to about 100 bar.
Claim 18
Dependent Claim
37 words
The process of claim 1 wherein the applied pressure differential between the side of the membrane contacted with the feed solution and and the other side of the membrane is from about 10 to about 80 bar.
Claim 19
Dependent Claim
29 words
The process of claim 1 wherein the feed solution is passed along one side of a membrane and subsequently passed along one side of at least one following membrane.
Claim 20
Dependent Claim
33 words
The process of claim 1 wherein part of the feed solution passed along one side of the membrane is reintroduced into the feed solution to be passed along the side of the membrane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |