US3356593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of metaxylene-paraxylene mixtures by extractive distillation
Assignee: Chevron USA Inc
•
Filing: 1965-08-17
•
Granted: 1967-12-05
•
Expires: 1985-08-17
Abstract
No abstract record available.
Inventors
- 👤 Suzuki Shigeto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:52
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A PROCESS FOR THE SEPARATION OF METAXYLENE FROM A MIXTURE OF PARAXYLENE AMD METAXYLENE, WHICH COMPRISES EXTRACTIVELY DISTILLING AT A TEMPERATURE BELOW ABOUT 110* C. SAID MIXTURE IN CONTACT WITH A LIQUID PHASE CONSISTING ESSENTIALLY OF A SUBSTANTIALLY ANHYDROUS CONCENTRATED SOLUTION OF SILVER ION IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACID, LOWER ALKANE SULFONIC ACIDS OR THEIR MIXTURES, THEREBY PRODUCING A DISTILLATE PORTION WHICH IS SUBSTANTIALLY ENRICHED IN PARAXYLENE AND AN EXTRACT PORTION WHICH IS SUBSTANTIALLY ENRICHED IN METAXYLENE.
Claim 2
Dependent Claim
83 words
A PROCESS FOR THE SEPARATION OF METAXYLENE FROM A MIXTURE OF PARAXYLENE AMD METAXYLENE, WHICH COMPRISES EXTRACTIVELY DISTILLING AT A TEMPERATURE BELOW ABOUT 110* C. SAID MIXTURE IN CONTACT WITH A LIQUID PHASE CONSISTING ESSENTIALLY OF A SUBSTANTIALLY ANHYDROUS CONCENTRATED SOLUTION OF SILVER ION IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACID, LOWER ALKANE SULFONIC ACIDS OR THEIR MIXTURES, THEREBY PRODUCING A DISTILLATE PORTION WHICH IS SUBSTANTIALLY ENRICHED IN PARAXYLENE AND AN EXTRACT PORTION WHICH IS SUBSTANTIALLY ENRICHED IN METAXYLENE.
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) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |