US3891603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removing heat of reaction in copolymerization of ethylene in aqueous dispersion
Assignee: BASF SE
•
Filing: 1973-12-28
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Granted: 1975-06-24
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Expires: 1993-12-28
Abstract
Abstract Copolymers of ethylene with 10 to 98 percent by weight of conventional comonomers are made by copolymerization in aqueous dispersion, at least a part of the heat of polymerization being removed by evaporation of the ethylene. The vapors are cooled by a cooling medium by heat exchange, in a cooling zone situated above the polymerization vessel and communicating with the latter, the hot vapors being fed to the upper end of the cooling zone, the cooled vapors returning to the polymerization vessel, so that the vapors are cooled by the cooling medium while they are flowing downward.
Inventors
- 👤 Eduard Heil
- 👤 Karl Kuchner
- 👤 Wolfgang Sliwka
- 👤 Harald Smits
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:07
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/0006; B01J19/0013; C; C08; C08F; C08F10/00; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00103; B01J2219/00105; B01J2219/00108
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
METHOD FOR MANUFACTURING COPOLYMERS OF ETHYLENE WITH 10 TO 98 PERCENT BY WEIGHT OF ONE OR MORE OF A VINYL ESTER OF AN ORGANIC ALKANOIC ACID CONTAINING 1 TO 12 CARBON ATOMS IN THE ALKYL GROUP, AN OLEFINICALLY UNSATURATED CARBOXYLIC ACID WITH 1 TO 12 CARBON ATOMS, AN ALKYL ESTER OF SAID OLEFINIC LLY UNSATURATED ACID, AN AMIDE OF SAID OLEFINICALLY UNSATURATED ACID, A NITRILE OF SAID OLEFINICALLY UNSATURATED ACID, VINYL CHLO RIDE, VINYLETHYLKETONE, VINYLSULFONIC ACID, OR A HYDROXYALKYL ACRYLATE, BY POLYMERIZATION THEREOF IN AQUEOUS DISPERSION, AT LEAST A PART OF THE HEAT OF OLYMERIZATION BEING REMOVED BY EVAPORATION OF THE ETHYLENE, THE ETHYLENE VAPORS BEING COOLED BY A COOLING MEDIUM, BY INDIRECT HEAT EXCHANGE, IN AN INDIRECT HEAT EXCHANGER IN A COOLING zONE SITUATED ABOVE THE POLYMERIZATION VESSEL AND IN COMMUNICATION WITH LATTER, THE COOLED VAPORS BEING RETURNED TO THE POLYMERIZATION VESSEL, WHEREIN
Claim 2
Dependent Claim
144 words
METHOD FOR MANUFACTURING COPOLYMERS OF ETHYLENE WITH 10 TO 98 PERCENT BY WEIGHT OF ONE OR MORE OF A VINYL ESTER OF AN ORGANIC ALKANOIC ACID CONTAINING 1 TO 12 CARBON ATOMS IN THE ALKYL GROUP, AN OLEFINICALLY UNSATURATED CARBOXYLIC ACID WITH 1 TO 12 CARBON ATOMS, AN ALKYL ESTER OF SAID OLEFINIC LLY UNSATURATED ACID, AN AMIDE OF SAID OLEFINICALLY UNSATURATED ACID, A NITRILE OF SAID OLEFINICALLY UNSATURATED ACID, VINYL CHLO RIDE, VINYLETHYLKETONE, VINYLSULFONIC ACID, OR A HYDROXYALKYL ACRYLATE, BY POLYMERIZATION THEREOF IN AQUEOUS DISPERSION, AT LEAST A PART OF THE HEAT OF OLYMERIZATION BEING REMOVED BY EVAPORATION OF THE ETHYLENE, THE ETHYLENE VAPORS BEING COOLED BY A COOLING MEDIUM, BY INDIRECT HEAT EXCHANGE, IN AN INDIRECT HEAT EXCHANGER IN A COOLING zONE SITUATED ABOVE THE POLYMERIZATION VESSEL AND IN COMMUNICATION WITH LATTER, THE COOLED VAPORS BEING RETURNED TO THE POLYMERIZATION VESSEL, WHEREIN
Claim 3
Dependent Claim
22 words
A method as claimed in claim 1, wherein copolymers of ethylene with 60 to 95 percent by weight of comonomers are made.
Claim 4
Dependent Claim
20 words
A method as claimed in claim 1, wherein polymerization is conducted at a pressure below the critical pressure of ethylene.
Claim 5
Dependent Claim
46 words
A method as claimed in claim 3, wherein the vapors are cooled by indirect heat exchange with a cooling medium, through tubes, the temperature of the cooling medium being below the condensation temperature of the ethylene at the prevailing pressure, so that the vapors are condensed.
Claim 6
Dependent Claim
26 words
A method as claimed in claim 1, wherein liquid comonomers are fed continuously or intermittently to the upper end of the cooling zone during the polymerization.
Claim 7
Dependent Claim
44 words
A method as claimed in claim 5, wherein the vapors condense by becoming dissolved in liquid comonomers fed to the upper end of the cooling zone, the temperature of the cooling medium being above the condensation temperature of the ethylene under the prevailing pressure.
Claim 8
Dependent Claim
19 words
A method as claimed in claim 1, wherein polymerization is conducted at a pressure between 5 and 50 bars.
References Cited (Backward Citations)
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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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |