Patent US4440219A successfully refreshed from Google Patents.
Patent US3928404A successfully refreshed from Google Patents.
US3928404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of high molecular weight aliphatic monocarboxylic acids by silicate contact and chromosulfuric acid oxidation of {60 -olefins
Assignee: Hoechst AG
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Filing: 1974-08-15
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Granted: 1975-12-23
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Expires: 1994-08-15
Abstract
Abstract Aliphatic monocarboxylic acids having from 16 to 70 carbon atoms in the molecule and being color-stable to ammonia and amines are prepared by chromosulfuric acid oxidation of such industrialgrade gamma -olefin mixtures which, before the oxidation, have been subjected to a thermal treatment in the presence of catalytic amounts of a silicate having a lamellar structure. The cited carboxylic acids are suitable for the manufacture of waxy substances.
Inventors
- 👤 Werner Strabberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:28
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
116 words
A PROCESS FOR THE PREPARATION OF HIGH MOLECULAR WEIGHT SATURATED ALIPHATIC CARBOXYLIC ACIDS BEING COLOR-STABLE TO AMMONIA AND MINES, BY OXIDATION OF A-OLEFINS OR A-OLEFIN MIXTURES HAVING FROM 16 TO 70 CARBON ATOMS IN THE MOLECULLE WITH CHROMOSULFURIC ACID, WHICH COMPRISES IN A FIRST STEP INTENSIELY CONTACTING IN THE MELT SAID A-OLEFINS OR A-OLEFIN MIXTURES HAVING VINYL DOUBLE BONDS AND OLEFINS HAVING VINYLIDENE DOUBLE BONDS AND OLEFINS HAVING TRANSVINYLENE DOUBLE BONDS WITH FROM 0.01 TO 5.0 WEIGHT %, RELATIVE TO THE OLEFINS, OF A SILICATE HAVING A LAMELLAR STRUCTURE AT A TEMPERATURE OF 120* TO 350*C AND IN A SECOND STEP CARRYING OUT THE OXIDATION WITH AQUEOUS CHAROMOSULFURIC ACID AT A TEMPERATURE OF 80* TO 150*C.
Claim 2
Dependent Claim
116 words
A PROCESS FOR THE PREPARATION OF HIGH MOLECULAR WEIGHT SATURATED ALIPHATIC CARBOXYLIC ACIDS BEING COLOR-STABLE TO AMMONIA AND MINES, BY OXIDATION OF A-OLEFINS OR A-OLEFIN MIXTURES HAVING FROM 16 TO 70 CARBON ATOMS IN THE MOLECULLE WITH CHROMOSULFURIC ACID, WHICH COMPRISES IN A FIRST STEP INTENSIELY CONTACTING IN THE MELT SAID A-OLEFINS OR A-OLEFIN MIXTURES HAVING VINYL DOUBLE BONDS AND OLEFINS HAVING VINYLIDENE DOUBLE BONDS AND OLEFINS HAVING TRANSVINYLENE DOUBLE BONDS WITH FROM 0.01 TO 5.0 WEIGHT %, RELATIVE TO THE OLEFINS, OF A SILICATE HAVING A LAMELLAR STRUCTURE AT A TEMPERATURE OF 120* TO 350*C AND IN A SECOND STEP CARRYING OUT THE OXIDATION WITH AQUEOUS CHAROMOSULFURIC ACID AT A TEMPERATURE OF 80* TO 150*C.
Claim 3
Dependent Claim
18 words
The process as claimed in claim 1, which comprises using bleaching earth as silicate having a lamellar structure.
Claim 4
Dependent Claim
17 words
The process as claimed in claim 1, which comprises using talcum as silicate having a lamellar structure.
Claim 5
Dependent Claim
37 words
The process as claimed in claim 1, which comprises using as aqueous chromosulfuric acid a chromosulfuric acid containing from 50 to 140 g of chromium trioxide and from 300 to 650 g of sulfuric acid per liter.
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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |