US4419510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for controlling cellulose etherification reaction
Assignee: Dow Chemical Co
•
Filing: 1982-07-30
•
Granted: 1983-12-06
•
Expires: 2002-07-30
Abstract
Abstract This invention provides a method for controlling the reaction between cellulose and an etherifying agent which comprises the steps of (a) combining cellulose with an alkylene oxide and alkyl halide in a reactor wherein an etherification reaction is initiated which includes a vapor phase, (b) periodically measuring the quantity of at least one of the reactants or products in the vapor phase of the reactor and therewith determining the rate of the etherification reaction taking place, and (c) regulating the reaction temperature continuously while the reaction is taking place by using the rate of reaction determined in step (b) to determine the amount of heating or cooling needed for the reactor.
Inventors
- 👤 Timothy Thomson
- 👤 Ferman Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:40
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/193
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
A method for controlling the reaction for making cellulose ether compounds from cellulose and an etherifying agent comprising the steps of: (a) combining cellulose with an alkylene oxide and alkyl halide in a reactor wherein an etherification reaction is initiated which includes a vapor phase, (b) periodically measuring the quantity of at least one of the reactants or products in the vapor phase of the reactor and therewith determining the rate of the etherification reaction taking place, and (c) regulating the reaction temperature continuously while the reaction is taking place by using the rate of reaction determined in step (b) to determine the amount of heating or cooling needed for the reactor.
Claim 2
Independent Claim
112 words
A method for controlling the reaction for making cellulose ether compounds from cellulose and an etherifying agent comprising the steps of: (a) combining cellulose with an alkylene oxide and alkyl halide in a reactor wherein an etherification reaction is initiated which includes a vapor phase, (b) periodically measuring the quantity of at least one of the reactants or products in the vapor phase of the reactor and therewith determining the rate of the etherification reaction taking place, and (c) regulating the reaction temperature continuously while the reaction is taking place by using the rate of reaction determined in step (b) to determine the amount of heating or cooling needed for the reactor.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein the measured reactants and products are methanol, ethanol, dimethyl ether, diethyl ether, methyl ethyl ether, ethylene oxide, propylene oxide, methyl chloride, ethyl chloride, or mixtures thereof.
Claim 4
Dependent Claim
10 words
The method of claim 2 wherein methyl chloride is measured.
Claim 5
Dependent Claim
10 words
The method of claim 2 wherein dimethyl ether is measured.
References Cited (Backward Citations)
US2492524A
Cited
US3424560A
Cited
US3839319A
Cited
US4015067A
Cited
US4096325A
Cited
US4121922A
Cited
US4270925A
Cited
US4180858A
Cited
US4251503A
Cited
US4251224A
Cited
US4272481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |