Patent US2588446A successfully refreshed from Google Patents.
US2588446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of isopropanol
Assignee: Standard Oil Development Co
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Filing: 1949-06-09
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Granted: 1952-03-11
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Expires: 1969-06-09
Abstract
No abstract record available.
Inventors
- 👤 Samuel W Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:41
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A PROCESS FOR THE PRODUCTION OF HIGH REFINED ISOPROPANOL OF IMPROVED ODOR QUALITY FROM CRUDE AQUEOUS ISOPROPANOL PREPARED BY THE SULFURIC ACID-CATALYZED HYDRATION OF PROPYLENE AND CONTAINING LOW-BOILING AND HIGH-BOILING IMPURITIES INCLUDING MALODOROUS BODIES GIVING RISE TO "MERCAPTAN" ODOR WHICH COMPRISES ADJUSTING THE PH OF THE CRUDE ALCOHOL TO THE BASIC SIDE, DISTILLING THE BASIC CRUDE ALCOHOL IN A FIRST DISTILLATION ZONE TO REMOVE THE LOWS-BOILING IMPURITIES AND ISOPROPANOL OVERHEAD FROM THE HIGH-BOILING IMPURITTIES AND WATER, CONDUCTING THE DISTILLATE FROM THE FIRST DISTILLATION ZONE TO A SECOND DISTILLATION ZONE, REMVOING LOW-BOILING IMPURITIES INCLUDING MALODOROUS BODIES GIVING RISE TO "MERCAPTAN" ODOR OVERHEAD FROM THE SECOND DISTILLATION ZONE AND RECOVERING HIGHLY REFINED ISOPROPANOL FREE OF MALODOROUS BODIES AS BOTTOMS FROM THE SECOND DISTILLATION ZONE.
Claim 2
Dependent Claim
122 words
A PROCESS FOR THE PRODUCTION OF HIGH REFINED ISOPROPANOL OF IMPROVED ODOR QUALITY FROM CRUDE AQUEOUS ISOPROPANOL PREPARED BY THE SULFURIC ACID-CATALYZED HYDRATION OF PROPYLENE AND CONTAINING LOW-BOILING AND HIGH-BOILING IMPURITIES INCLUDING MALODOROUS BODIES GIVING RISE TO "MERCAPTAN" ODOR WHICH COMPRISES ADJUSTING THE PH OF THE CRUDE ALCOHOL TO THE BASIC SIDE, DISTILLING THE BASIC CRUDE ALCOHOL IN A FIRST DISTILLATION ZONE TO REMOVE THE LOWS-BOILING IMPURITIES AND ISOPROPANOL OVERHEAD FROM THE HIGH-BOILING IMPURITTIES AND WATER, CONDUCTING THE DISTILLATE FROM THE FIRST DISTILLATION ZONE TO A SECOND DISTILLATION ZONE, REMVOING LOW-BOILING IMPURITIES INCLUDING MALODOROUS BODIES GIVING RISE TO "MERCAPTAN" ODOR OVERHEAD FROM THE SECOND DISTILLATION ZONE AND RECOVERING HIGHLY REFINED ISOPROPANOL FREE OF MALODOROUS BODIES AS BOTTOMS FROM THE SECOND DISTILLATION ZONE.
References Cited (Backward Citations)
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US1614877A
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US1933505A
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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) | 1955-03-11 | 1955-09-10 | 1956-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-11 | 1959-09-10 | 1960-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-11 | 1963-09-10 | 1964-03-11 | $7700.00 | Window Closed / Lapsed |