US3898135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extractive distillation of C{HD 4 {B hydrocarbons using a three component solvent system
Assignee: Texas Petrochemicals Corp
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Filing: 1973-09-28
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Granted: 1975-08-05
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Expires: 1993-09-28
Abstract
Abstract An improvement in separation of closely boiling hydrocarbons by extractive distillation with alkoxynitrile wherein equipment plugging and fouling polymer is solubilized by the presence of small amounts of furfural.
Inventors
- 👤 Calvin M Tidwell
- 👤 Val G Henneberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:47
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
144 words
IN A PROCESS FOR THE SEPARATION OF MIXTURES OF C4 PARAFFIN MONO-OLEFIN AND DIOLEFIN HYDROCARBONS BY A PROCESS OF EXTRACTIVE DISTILLATION COMPRISING CONTACTING SAID MIXTURES WITH A SOLVENT COMPRISING AN ALKOXYNITRILE OF THE FORMULA R1-/R2-CN WHERE R1 AND R2 ARE ALKYL RADICALS HAVING FROM 1 TO 3 CARBON ATOMS WHICH HAS PREFERABLE SOLUBILITY FOR ONE OR MORE OF SAID HYDROCARBON PROVIDED AT LEAST ONE OF SAID HYDROCARBONS IS DISSOLVED IN THE SOLVENT AND SAID DISSOLVED HYDROCARBON IS REMOVED FROM THE ETRACTIVE DDISTILLATION ZONE THEREIN AND AT LEAST ONE OTHER HYDROCARBON FROM SAID MIXTURE PASSES FROM THE EXTRACTIVE DISTILLATION ZONE AS OVERHEAD WHEREIN THE IMPROVEMENT COMPRIES REDUCING FOULING BY POLYBUTADIENE BY UTILIZING AS A SOLVENT A MIXTURE CONSISTING ESSENTIALLY OF FROM 70 TO 98 WEIGHT PERCENT OF SAID ALKOXYNITRILE, FROM 0.5 TO 25 WEIGHT PERCENT OF FURFURAL AND FROM 1 TO 20 WEIGHT PERCENT WATER.
Claim 2
Dependent Claim
144 words
IN A PROCESS FOR THE SEPARATION OF MIXTURES OF C4 PARAFFIN MONO-OLEFIN AND DIOLEFIN HYDROCARBONS BY A PROCESS OF EXTRACTIVE DISTILLATION COMPRISING CONTACTING SAID MIXTURES WITH A SOLVENT COMPRISING AN ALKOXYNITRILE OF THE FORMULA R1-/R2-CN WHERE R1 AND R2 ARE ALKYL RADICALS HAVING FROM 1 TO 3 CARBON ATOMS WHICH HAS PREFERABLE SOLUBILITY FOR ONE OR MORE OF SAID HYDROCARBON PROVIDED AT LEAST ONE OF SAID HYDROCARBONS IS DISSOLVED IN THE SOLVENT AND SAID DISSOLVED HYDROCARBON IS REMOVED FROM THE ETRACTIVE DDISTILLATION ZONE THEREIN AND AT LEAST ONE OTHER HYDROCARBON FROM SAID MIXTURE PASSES FROM THE EXTRACTIVE DISTILLATION ZONE AS OVERHEAD WHEREIN THE IMPROVEMENT COMPRIES REDUCING FOULING BY POLYBUTADIENE BY UTILIZING AS A SOLVENT A MIXTURE CONSISTING ESSENTIALLY OF FROM 70 TO 98 WEIGHT PERCENT OF SAID ALKOXYNITRILE, FROM 0.5 TO 25 WEIGHT PERCENT OF FURFURAL AND FROM 1 TO 20 WEIGHT PERCENT WATER.
Claim 3
Dependent Claim
29 words
The process according to claim 1 wherein said alkoxynitrile is selected from the group consisting of 3-methoxyacetonitrile; 3-ethoxyacetonitrile; 3-propoxyacetonitrile; 3-methoxypropionitrile; 3-ethoxypropionitrile; 3-propoxypropionitrile; 4-methoxybutyronitrile; 4-ethoxybutyronitrile and 4-propoxybutyronitrile and mixtures thereof.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the said R is a straight chain radical having from 1 to 3 carbon atoms.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the said alkoxynitrile is 3-ethoxypropionitrile.
Claim 6
Dependent Claim
11 words
The process of claim 2 wherein the said alkoxynitrile is 3-methoxypropionitrile.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the said mixtures of hydrocarbons comprises butadiene-1,3.
Claim 8
Dependent Claim
107 words
A process for the extractive distillation of a hydrocarbon mixture comprising principally butadiene, n-butenes and n-butane for the selective extraction of butadiene therefrom comprising contacting said mixture with a solvent comprising 70 to 98 weight percent alkoxynitrile selected from the group consisting of 3-ethoxypropionitrile and 3-methoxypropionitrile, from 1 to 20 weight percent water and from 0.5 to 25 weight percent furfural, dissolving a component comprising predominately butadiene in said solvent and passing off overhead a component comprising predominately n-butane and n-butenes, forming a polybutadiene by-product and dissolving a predominate amount of said by-product in said solvent, and removing said by-product from said extractive distillation in said solvent.
Claim 9
Dependent Claim
107 words
A process for the extractive distillation of a hydrocarbon mixture comprising principally butadiene, n-butenes and n-butane for the selective extraction of butadiene therefrom comprising contacting said mixture with a solvent comprising 70 to 98 weight percent alkoxynitrile selected from the group consisting of 3-ethoxypropionitrile and 3-methoxypropionitrile, from 1 to 20 weight percent water and from 0.5 to 25 weight percent furfural, dissolving a component comprising predominately butadiene in said solvent and passing off overhead a component comprising predominately n-butane and n-butenes, forming a polybutadiene by-product and dissolving a predominate amount of said by-product in said solvent, and removing said by-product from said extractive distillation in said solvent.
Claim 10
Dependent Claim
11 words
The process according to claim 7 wherein the alkoxynitrile is 3-ethoxypropionitrile.
Claim 11
Dependent Claim
11 words
The process according to claim 7 wherein the alkoxynitrile is 3-methoxypropionitrile.
Claim 12
Dependent Claim
114 words
A process for the extractive distillation of a hydrocarbon mixture comprising principally butadiene, n-butenes and n-butane for the selective extraction of butadiene therefrom comprising contacting said mixture with a solvent comprising 70 to 98 weight percent of an alkoxynitrile of the formula R1-O-R2-CN wherein R1 and R2 are alkyl radicals having from 1 to 3 carbon atoms, from 0.5 to 25 weight percent furfural and from 1 to 20 weight percent water, dissolving a component comprising predominately butadiene in said solvent and passing off overhead a component comprising predominately n-butane and n-butene, forming a polybutadiene by-product and dissolving said by-product in said solvent, and removing said by-product from said extractive distillation in said solvent.
Claim 13
Dependent Claim
114 words
A process for the extractive distillation of a hydrocarbon mixture comprising principally butadiene, n-butenes and n-butane for the selective extraction of butadiene therefrom comprising contacting said mixture with a solvent comprising 70 to 98 weight percent of an alkoxynitrile of the formula R1-O-R2-CN wherein R1 and R2 are alkyl radicals having from 1 to 3 carbon atoms, from 0.5 to 25 weight percent furfural and from 1 to 20 weight percent water, dissolving a component comprising predominately butadiene in said solvent and passing off overhead a component comprising predominately n-butane and n-butene, forming a polybutadiene by-product and dissolving said by-product in said solvent, and removing said by-product from said extractive distillation in said solvent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |