Patent US3872170A successfully refreshed from Google Patents.
US3872170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous manufacture of an aqueous choline chloride solution
Assignee: BASF SE
•
Filing: 1972-03-23
•
Granted: 1975-03-18
•
Expires: 1992-03-23
Abstract
Abstract Manufacture of choline chloride from trimethylammonium chloride and ethylene oxide in liquid phase, wherein discoloration of the reaction mixture is obviated by continuously bathing the walls of the reaction vessel above the level of the liquid therein.
Inventors
- 👤 Horst Bosche
- 👤 Uwe Soenksen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:41
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; B01J19/1868; B01J19/1881; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00103; B01J2219/00105; B01J2219/0011; B01J2219/19; B01J2219/194; B01J2219/1941; B01J2219/1942
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
80 words
IN A CONTINOUS PROCESS FOR THE MANUFACTURE OF CHOLINE CHLORIDE BY REACTING EXCESS ETHYLENE OXIDE WITH TRIMETHYLAMMONIUM CHLORIDE IN AQUEOUS SOLUTION AT A TEMPERATURE OF FROM 30* TO 100*C IN A CLOSED STIRRED VESSEL IN WHICH A GAS SPACE IS PRESENT ABOVE THE LEVEL OF THE LIQUID REACTION MIXTURE, THE IMPROVEMENT COMPRISING OPERATING AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AND CONTINOUSLY BATHING THE SURFACES DEFINING THE GAS SPACE IN THE STIRRED VESSEL WITH THE REACTION MIXTURE OR WITH FRESH TRIMETHYLAMMONIUM CHLORIDE SOLUTION.
Claim 2
Dependent Claim
80 words
IN A CONTINOUS PROCESS FOR THE MANUFACTURE OF CHOLINE CHLORIDE BY REACTING EXCESS ETHYLENE OXIDE WITH TRIMETHYLAMMONIUM CHLORIDE IN AQUEOUS SOLUTION AT A TEMPERATURE OF FROM 30* TO 100*C IN A CLOSED STIRRED VESSEL IN WHICH A GAS SPACE IS PRESENT ABOVE THE LEVEL OF THE LIQUID REACTION MIXTURE, THE IMPROVEMENT COMPRISING OPERATING AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AND CONTINOUSLY BATHING THE SURFACES DEFINING THE GAS SPACE IN THE STIRRED VESSEL WITH THE REACTION MIXTURE OR WITH FRESH TRIMETHYLAMMONIUM CHLORIDE SOLUTION.
Claim 3
Dependent Claim
65 words
A process as claimed in claim 1, wherein, in a second reaction stage, the unreacted ethylene oxide is removed from the reaction mixture over a period of not more than 30 minutes and at a temperature of from 40* to 90*C by stripping with an inert gas, which gas is then washed with fresh trimethylammonium chloride solution for absorption of ethylene oxide from the gas.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1, wherein the trimethylammonium chloride is used as a from 50 to 75% w/w aqueous solution.
Claim 5
Dependent Claim
18 words
A process as claimed in claim 1, wherein the reaction is carried out at from 50* to 70*c.
Claim 6
Dependent Claim
21 words
A process as claimed in claim 1, wherein an ethylene oxide partial pressure of from 0.5 to 2 atmospheres is maintained.
Claim 7
Dependent Claim
21 words
A process as claimed in claim 1, wherein the residence time in the stirred vessel is from 30 to 150 minutes.
Claim 8
Dependent Claim
19 words
A process as claimed in claim 1, wherein the reaction pressure is from about 1 to 4 atmospheres absolute.
References Cited (Backward Citations)
US2870198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |