US3919342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propane recovery in HF alkylation utilizing extraction or two-phase condensation for removal of organic fluoride
Assignee: Phillips Petroleum Co
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Filing: 1973-10-18
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Granted: 1975-11-11
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Expires: 1993-10-18
Abstract
Abstract Two substantially immiscible fluids which are but sparingly soluble in sense that two phases of them forms when real amount of them as liquids are present together, in vapor forms, in each of which a third fluid is soluble, are condensed and before generation, and separation of phases formed is effected are intimately intermingled as condensing or condensed so as to more nearly reach equilibrim concentration of the third fluid in each of said two fluids upon liquid phases formation said third fluid normally, upon phase formation and separation, not reaching in any acceptable time its equilibrium concentration in each of said two immiscible fluids. In alkylation of hydrocarbons, e.g., in an alkylation of an isoparaffin with an olefin, in which an overhead hydrocarbon stream from a fractionator containing hydrocarbon, alkyl fluoride, and hydrofluoric acid is condensed forming a hydrocarbon phase and an acid phase, and the phases separated, the overhead, upon being condensed at least in part, is subjected to intimate admixing prior to forming two separate liquid phases and separating them each from the other. In one embodiment, the condensing fluids are vigorously admixed prior to permitting phases formation. In another, the phases already substantially formed are intimately admixed prior to separation of them, thus to ensure, upon separation of the phases, more nearly the equilibrium concentration of said third fluid in each of said two fluids. In a further embodiment, the formed, separated phases are intimately intermingled, phases again allowed to form and then again separated.
Inventors
- 👤 Charles C Chapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:34
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/56; C07C2/58; C07C2/62; C07C2527/00; C07C2527/06; C07C2527/08; C07C2527/12; C07C2527/1206
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
275 words
A PROCESS FOR THE ALKYLATION OF AN ISOPARAFFIN WITH AN OLEFIN IN THE PRESENCE OF HF ACID CATALYST WHICH COMPRISES ALKYLATING ISOPARAFFIN WITH AT LEAST ONE OLEFIN IN THE PRESENCE OF HF ACID CATALYST, SETTLING FROM THE ALKYLATION EFFLUENT A FIRS HYDROCARBON PHASE CONTAINING HF ACID AND ORGANIC FLUORIDE PASSING A FIRST PORTION OF SAID FIRST HYDROCARBON PHASE INTO A FIRST FRACTIONATION ZONE AND A SECOND PORTION OF SAID HYDROCARBON PHASE STREAM IN SAID FIRST FRACTIONATION ZONE AND PASSHYDROCARBON STREAM IN SAID FIRST FRACTIONATION ZONE AND PASSING THE REMAINDER OF SAID FIRST PORTION TO SAID SECOND FRACTIONATION ONE, RECOVERING FROM SAID SECOND FRACTIONATION ZONE AN ALKYLATE PRODUCT AND RECYCLING ISOPARAFFIN, PROPANE, HF, AND ORGANIC FLUORIDE FROM SAID SECOND FRACTIONATION ZONE TO SAID ALKYLATION, CONDENSING SAID LIGHT HYDROCARBON STREAM TO OBTAIN A SECOND HYDROCARBON PHASE AND AN HF ACID PHASE, RETUNING A FIRST PORTION OF SAID SECOND HYDROCARBON PHASE AS REFLUX TO SAID FIRST FRACTIONATION ZONE, MIXING A SECOND PORTION OF SAID SECOND HYDROCARBON PHASE WITH AT LEAST A PORTION OF SAID HF ACID PHASE THUS TO EXTRACT FROM SAID SECOND PORTION OF SAID SECOND HYDROCARBON PHASE INTO SAID PORTION OF SAID HF ACID PHASE THE ORGANIC FLUORIDE WHICH IS IN SAID SECOND PORION OF SAID SECOND HYDROCARBON PHASE, SETTLING THE MIXTURE OF SAID SECOND PORTION OF SAID HF ACID PHASE AND RECOVERING FROM SAID MIXTURE AN HF ACID PHASE ENRICHED BY SAID ORGANIC FLUORIDE AND A THIRD HYDROCARBON PHASE FROM WHICH ORGANIC FLUORIDE HAS BEEN REMOVED, TREATING SAID THIRD HYDROCARBON PHASE FROM WHICH ORGANIC FLUORIED HAS BEEN REMOVED TO STRIP HF ACID FROM THE THIRD HYDROCARBON PHASE AND RECOVERING THE STRIPPED HYDROCARBON FROM THE PROCESS.
Claim 2
Dependent Claim
275 words
A PROCESS FOR THE ALKYLATION OF AN ISOPARAFFIN WITH AN OLEFIN IN THE PRESENCE OF HF ACID CATALYST WHICH COMPRISES ALKYLATING ISOPARAFFIN WITH AT LEAST ONE OLEFIN IN THE PRESENCE OF HF ACID CATALYST, SETTLING FROM THE ALKYLATION EFFLUENT A FIRS HYDROCARBON PHASE CONTAINING HF ACID AND ORGANIC FLUORIDE PASSING A FIRST PORTION OF SAID FIRST HYDROCARBON PHASE INTO A FIRST FRACTIONATION ZONE AND A SECOND PORTION OF SAID HYDROCARBON PHASE STREAM IN SAID FIRST FRACTIONATION ZONE AND PASSHYDROCARBON STREAM IN SAID FIRST FRACTIONATION ZONE AND PASSING THE REMAINDER OF SAID FIRST PORTION TO SAID SECOND FRACTIONATION ONE, RECOVERING FROM SAID SECOND FRACTIONATION ZONE AN ALKYLATE PRODUCT AND RECYCLING ISOPARAFFIN, PROPANE, HF, AND ORGANIC FLUORIDE FROM SAID SECOND FRACTIONATION ZONE TO SAID ALKYLATION, CONDENSING SAID LIGHT HYDROCARBON STREAM TO OBTAIN A SECOND HYDROCARBON PHASE AND AN HF ACID PHASE, RETUNING A FIRST PORTION OF SAID SECOND HYDROCARBON PHASE AS REFLUX TO SAID FIRST FRACTIONATION ZONE, MIXING A SECOND PORTION OF SAID SECOND HYDROCARBON PHASE WITH AT LEAST A PORTION OF SAID HF ACID PHASE THUS TO EXTRACT FROM SAID SECOND PORTION OF SAID SECOND HYDROCARBON PHASE INTO SAID PORTION OF SAID HF ACID PHASE THE ORGANIC FLUORIDE WHICH IS IN SAID SECOND PORION OF SAID SECOND HYDROCARBON PHASE, SETTLING THE MIXTURE OF SAID SECOND PORTION OF SAID HF ACID PHASE AND RECOVERING FROM SAID MIXTURE AN HF ACID PHASE ENRICHED BY SAID ORGANIC FLUORIDE AND A THIRD HYDROCARBON PHASE FROM WHICH ORGANIC FLUORIDE HAS BEEN REMOVED, TREATING SAID THIRD HYDROCARBON PHASE FROM WHICH ORGANIC FLUORIED HAS BEEN REMOVED TO STRIP HF ACID FROM THE THIRD HYDROCARBON PHASE AND RECOVERING THE STRIPPED HYDROCARBON FROM THE PROCESS.
Claim 3
Dependent Claim
111 words
A process according to claim 1 wherein at least a portion of said admixed second portion of said second hydrocarbon phase and said portion of said HF acid phase is heated to produce a heated HF-organic fluoride phase of reduced hydrocarbon content and heated hydrocarbon phase from which organic fluoride has been removed, and wherein at least a portion of said HF-organic fluoride phase in heated condition is combined with another portion of said admixed second portion of said second hydrocarbon phase and said portion of said HF acid, and wherein said heated hydrocarbon phase is treated to strip HF therefrom and the thus stripped hydrocarbon is yielded from the process.
Claim 4
Dependent Claim
36 words
A process according to claim 1 wherein said HF acid phase and said second portion of said second hydrocarbon phase are combined in an eductor zone motivated by said second portion of said second hydrocarbon phase.
Claim 5
Dependent Claim
59 words
A process according to claim 3 wherein the eductor effluent is used to motivate a further eductor zone into which a heated HF-organic fluoride phase is educted, the resulting mixture of said heated HF-organic fluoride phase and said eductor effluent is separated into said third hydrocarbon phase from which organic fluoride has been removed and an HF-organic fluoride phase.
Claim 6
Dependent Claim
32 words
A process according to claim 3 wherein said isoparaffin is at least one of isobutane and isopentane, said olefin is ethylene and a higher olefin and the organic fluoride includes ethyl fluoride.
Claim 7
Dependent Claim
57 words
A PROCESS ACCORDING TO CLAIM 1 WHEREIN SAID ALKYLATE PRODUCT IS INTIMATELY MIXED WITH A PORTION OF SAID HF ACID PHAE TO EXTRACT FROM SAID ALKYLATE PRODUCT INTO SAID PORTION F SAID HF ACID PHASE THE ORGANIC FLUORIDE WHICH IS IN SAID ALKYLATE PHASE, THUS RECOVERING A SUBSTANTIALLY ORGANIC FLUORIDE-FREE ALKYLATE AND HF ACID CONTAINING ORGANIC FLUORIDE.
Claim 8
Independent Claim
134 words
A method for producing an alkylate from ethylene, a higher olefin and an isoparaffin in the presence of HF acid catalyst which comprises the steps of: a. alkylating said ethylene and said higher olefin with said isoparaffin, b. separating the alkylation effluent into a hydrocarbon phase and an acid phase, c. fractionating said hydrocarbon phase to withdraw an alkylate product and to separate a light fraction containing ethane, propane, ethyl fluoride, and HF, d. chilling said light fraction to substantially condense said fraction into liquids, e. intimately mixing the condensed liquids of step (d) and separating the mixed liquids into an HF liquid phase and a hydrocarbon liquid phase, f. removing ethane from said hydrocarbon liquid phase, and g. recovering said hydrocarbon liquid phase from step (f) comprising propane of reduced ethyl fluoride content.
Claim 9
Independent Claim
134 words
A method for producing an alkylate from ethylene, a higher olefin and an isoparaffin in the presence of HF acid catalyst which comprises the steps of: a. alkylating said ethylene and said higher olefin with said isoparaffin, b. separating the alkylation effluent into a hydrocarbon phase and an acid phase, c. fractionating said hydrocarbon phase to withdraw an alkylate product and to separate a light fraction containing ethane, propane, ethyl fluoride, and HF, d. chilling said light fraction to substantially condense said fraction into liquids, e. intimately mixing the condensed liquids of step (d) and separating the mixed liquids into an HF liquid phase and a hydrocarbon liquid phase, f. removing ethane from said hydrocarbon liquid phase, and g. recovering said hydrocarbon liquid phase from step (f) comprising propane of reduced ethyl fluoride content.
Claim 10
Dependent Claim
30 words
A method according to claim 7 wherein said fractionating step (c) includes at least one isoparaffin fraction containing alkyl fluoride and said isoparaffin fraction is recycled to said alkylating step.
Claim 11
Dependent Claim
21 words
A method according to claim 7 wherein said HF liquid phase which contains ethyl fluoride is recycled to said alkylating step.
Claim 12
Dependent Claim
20 words
A method according to claim 7 wherein ethane in step (f) is removed from said hydrocarbon liquid phase by heating.
Claim 13
Dependent Claim
35 words
A method according to claim 7 wherein the isoparaffin is at least one of isobutane, isopentane, and isohexane, and the higher olefin is at least one of propylene, a butylene, an amylene, and a hexylene.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |