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US2768220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of c8 aromatic compounds by forming complexes with antimony tribromide
Assignee: Shell Development Co
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Filing: 1954-09-13
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Granted: 1956-10-23
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Expires: 1974-09-13
Abstract
No abstract record available.
Inventors
- 👤 Alan C Nixon
- 👤 Jr Carl H Deal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:43
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/152; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
185 words
THE METHOD OF SEPARATING A SUBSTANTIALLY PURE C8 AROMATIC HYDROCARBON FROM A MIXTURE CONSISTING ESSENTIALLY OF SUBSTANTIAL PROPORTIONS EACH OF AT LEAST TWO ISOMERIC C8 AROMATIC HYDROCARBONS BOILING BELOW 144* C., SAID MIXTURE CONTAINING FROM 5% TO 40% OF PARAXYLENE ON THE BASIS OF SUCH AROMATIC HYDROCARBONS, WHICH COMPRISES FORMING AN ADMIXTURE OF SAID MIXTURE WITH ANTIMONY TRIBROMIDE, THE AMOUNT OF ANTIMONY TRIBROMIDE AND THE COMPOSITION OF SAID MIXTURE BEING SUCH THAT THE COMPOSITION OF SAID ADMIXTURE LIES IN AN ANTIMONY TRIBROMIDE: C8 AROMATIC HYDROCARBON COMPLEX REGION OF THE QUATERNARY PHASE DIAGRAM DEFINED IN FIGURES I AND II, IN WHICH, UPON COOLING SAID ADMIXTURE, A SOLID PHASE COMPLEX OF ANTIMONY TRIBROMIDE WITH ONLY ONE OF SAID ISOMERIC C8 AROMATIC HYDROCARBONS IS PRODUCED; COOLING SAID ADMIXTURE TO PRODUCE A SUBSTANTIAL QUANTITY OF ONLY SAID SOLID PHASE COMPLEX AND A REMAINING MOTHER LIQUOR CONTAINING ANTIMONY TRIBROMIDE AND SOME OF SAID ONE C8 AROMATIC HYDROCARBON AND BEING ENRICHED IN OTHER OF SAID ISOMERIC C8 AROMATIC HYDROCARBONS; SEPARATING SAID SOLID PHASE COMPLEX FROM SAID MOTHER LIQUOR; AND RECOVERING THE SUBSTANTIALLY PURE C8 AROMATIC HYDROCARBON FROM SAID SOLID PHASE COMPLEX.
Claim 2
Independent Claim
185 words
THE METHOD OF SEPARATING A SUBSTANTIALLY PURE C8 AROMATIC HYDROCARBON FROM A MIXTURE CONSISTING ESSENTIALLY OF SUBSTANTIAL PROPORTIONS EACH OF AT LEAST TWO ISOMERIC C8 AROMATIC HYDROCARBONS BOILING BELOW 144* C., SAID MIXTURE CONTAINING FROM 5% TO 40% OF PARAXYLENE ON THE BASIS OF SUCH AROMATIC HYDROCARBONS, WHICH COMPRISES FORMING AN ADMIXTURE OF SAID MIXTURE WITH ANTIMONY TRIBROMIDE, THE AMOUNT OF ANTIMONY TRIBROMIDE AND THE COMPOSITION OF SAID MIXTURE BEING SUCH THAT THE COMPOSITION OF SAID ADMIXTURE LIES IN AN ANTIMONY TRIBROMIDE: C8 AROMATIC HYDROCARBON COMPLEX REGION OF THE QUATERNARY PHASE DIAGRAM DEFINED IN FIGURES I AND II, IN WHICH, UPON COOLING SAID ADMIXTURE, A SOLID PHASE COMPLEX OF ANTIMONY TRIBROMIDE WITH ONLY ONE OF SAID ISOMERIC C8 AROMATIC HYDROCARBONS IS PRODUCED; COOLING SAID ADMIXTURE TO PRODUCE A SUBSTANTIAL QUANTITY OF ONLY SAID SOLID PHASE COMPLEX AND A REMAINING MOTHER LIQUOR CONTAINING ANTIMONY TRIBROMIDE AND SOME OF SAID ONE C8 AROMATIC HYDROCARBON AND BEING ENRICHED IN OTHER OF SAID ISOMERIC C8 AROMATIC HYDROCARBONS; SEPARATING SAID SOLID PHASE COMPLEX FROM SAID MOTHER LIQUOR; AND RECOVERING THE SUBSTANTIALLY PURE C8 AROMATIC HYDROCARBON FROM SAID SOLID PHASE COMPLEX.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |