Patent US3917577A successfully refreshed from Google Patents.
US3917577A
Expired / Lapsed
US
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Continuous production of ethylene homopolymers
Assignee: BASF SE
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Filing: 1971-08-26
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Granted: 1975-11-04
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Expires: 1991-08-26
Abstract
Abstract A process for the continuous production of ethylene homopolymers by polymerization of ethylene by means of a polymerization initiator and a polymerization regulator at elevated temperature and superatmospheric pressure in a tubular reactor having two or three successive reaction zones, a mixture of ethylene, the polymerization initiator and the polymerization regulator being introduced continuously at the beginning of each reaction zone. It is characteristic of the process according to the invention that special conditions as regards temperature, pressure, polymerization initiator and polymerization regulator are maintained in the individual reaction zones.
Inventors
- 👤 Hans-Georg Trieschmann
- 👤 Helmut Pfannmueller
- 👤 Friedrich Urban
- 👤 Oskar Buechner
- 👤 Klaus Steigerwald
- 👤 Wolfgang Ball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:26
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
A PROCESS FOR THE CONTINUOUS PRODUCTION OF ETHYLENE HOMOPOLYMERS HAVING A DENSITY OF FROM 0.923 TO 0.927 G/CCM BY POLYMERIZATION OF ETHYLENE UNDER THE ACTION OF A FREE-RADICAL POLYMERIZATION INITATOR AND A POLYMERIZATION REGULATOR AT A REACTION TEMPERATURE OF FROM 160* TO 350*C AND A PRESSURE OF FROM 2100 TO 4000 ATMOSPHERES IN A TUBULAR REACTOR HAVING TWO OR THREE SUCCESSIVE REACTION ZONES OF ABOUT THE SAME LENGTH, A MIXTURE OF ETHYLENE, POLYMERIZATION INITATOR AND POLYMERIZATION REGULATOR BEING CONTINUOUSLY INTRODUCED INTO THE REACTOR AT THE BEGINING OF EACH REACTION ZONE, WHEREIN
Claim 2
Dependent Claim
91 words
A PROCESS FOR THE CONTINUOUS PRODUCTION OF ETHYLENE HOMOPOLYMERS HAVING A DENSITY OF FROM 0.923 TO 0.927 G/CCM BY POLYMERIZATION OF ETHYLENE UNDER THE ACTION OF A FREE-RADICAL POLYMERIZATION INITATOR AND A POLYMERIZATION REGULATOR AT A REACTION TEMPERATURE OF FROM 160* TO 350*C AND A PRESSURE OF FROM 2100 TO 4000 ATMOSPHERES IN A TUBULAR REACTOR HAVING TWO OR THREE SUCCESSIVE REACTION ZONES OF ABOUT THE SAME LENGTH, A MIXTURE OF ETHYLENE, POLYMERIZATION INITATOR AND POLYMERIZATION REGULATOR BEING CONTINUOUSLY INTRODUCED INTO THE REACTOR AT THE BEGINING OF EACH REACTION ZONE, WHEREIN
Claim 3
Dependent Claim
71 words
AT THE BEGINING OF THE FIRST REACTION ZONE A MIXTURE IS INTRODUCED WHICH HAS A TEMPERATURE OF FROM 160* TO 200*C, WHICH IS UNDER A PRESSURE OF FROM 2100 TO 4000 ATMOSPHERES AND WHICH CONTAINS ETHYLENE, FROM 2 TO 100 MOLE PPM (WITH REFERENCE TO ETHYLENE) OF A FREE-RADICAL POLYMERIZATION INITATOR AND FROM 0.3 TO 0.7 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF ETHYLENE OF THE POLYMERIZATION REGULATOR PROPIONALDEHYDE,
Claim 4
Dependent Claim
71 words
AT THE BEGINING OF THE FIRST REACTION ZONE A MIXTURE IS INTRODUCED WHICH HAS A TEMPERATURE OF FROM 160* TO 200*C, WHICH IS UNDER A PRESSURE OF FROM 2100 TO 4000 ATMOSPHERES AND WHICH CONTAINS ETHYLENE, FROM 2 TO 100 MOLE PPM (WITH REFERENCE TO ETHYLENE) OF A FREE-RADICAL POLYMERIZATION INITATOR AND FROM 0.3 TO 0.7 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF ETHYLENE OF THE POLYMERIZATION REGULATOR PROPIONALDEHYDE,
Claim 5
Dependent Claim
86 words
AT THE BEGINING OF THE SECOND REACTION ZONE A MIXTURE IS INTRODUCED WHIH HAS A TEMPERATURE OF FROM 170* TO 210*C. WHICH IS UNDER PRESSURE OF FROM 2100 TO 4000 ATMOSPHERES AND WHICH CONTAINS ETHYLENE, FROM 2 TO 100 MOLE PPM (WITH REFERENCE TO ETHYLNE) OF A FREE-RADICAL POLYMERIZATION INITATOR AND FROM 40 TO 60% BY WEIGHT OF THE AMOUNT OF THE POLYMERIZATION REGULATOR PROPIONALDEHYDE INTRODUCED PER 100 PARTS BY WEIGHT O ETHYLENE INTO THE FIRST REACTION ZONE, AND WHEN THERE IS A THIRD REACTION ZONE,
Claim 6
Dependent Claim
86 words
AT THE BEGINING OF THE SECOND REACTION ZONE A MIXTURE IS INTRODUCED WHIH HAS A TEMPERATURE OF FROM 170* TO 210*C. WHICH IS UNDER PRESSURE OF FROM 2100 TO 4000 ATMOSPHERES AND WHICH CONTAINS ETHYLENE, FROM 2 TO 100 MOLE PPM (WITH REFERENCE TO ETHYLNE) OF A FREE-RADICAL POLYMERIZATION INITATOR AND FROM 40 TO 60% BY WEIGHT OF THE AMOUNT OF THE POLYMERIZATION REGULATOR PROPIONALDEHYDE INTRODUCED PER 100 PARTS BY WEIGHT O ETHYLENE INTO THE FIRST REACTION ZONE, AND WHEN THERE IS A THIRD REACTION ZONE,
Claim 7
Dependent Claim
87 words
at the beginning of the second reaction zone a mixture is introduced which has a temperature of from 170* to 210*C. which is under a pressure of from 2100 to 4000 atmospheres and which contains ethylene, from 2 to 100 mole ppm (with referEnce to ethylene) of a free-radical polymerization initiator and from 40 to 60% by weight of the amount of the polymerization regulator propionaldehyde introduced per 100 parts by weight of ethylene into the first reaction zone; and when there is a third reaction zone,
Claim 8
Dependent Claim
87 words
at the beginning of the second reaction zone a mixture is introduced which has a temperature of from 170* to 210*C. which is under a pressure of from 2100 to 4000 atmospheres and which contains ethylene, from 2 to 100 mole ppm (with referEnce to ethylene) of a free-radical polymerization initiator and from 40 to 60% by weight of the amount of the polymerization regulator propionaldehyde introduced per 100 parts by weight of ethylene into the first reaction zone; and when there is a third reaction zone,
Claim 9
Dependent Claim
137 words
at the beginning of the third reaction zone a mixture is introduced which has a temperature of from 170* to 210*C, which is under a pressure of from 2100 to 4000 atmospheres and which contains ethylene, from 2 to 100 mole ppm (with reference to ethylene) of a free-radical polymerization initiator and from 40 to 60% by weight of the amount of the polymerization regulator propionaldehyde introduced per 100 parts by weight of ethylene into the second reaction zone; with the proviso that the ratio by weight of the mixture introduced per unit time into the first and second reaction zones is from 1:2 and 2:1 and, when there is a third reaction zone, the ratio by weight of the mixture introduced per unit time into the second and third reaction zones is from 1:2 to 2:1.
Claim 10
Dependent Claim
137 words
at the beginning of the third reaction zone a mixture is introduced which has a temperature of from 170* to 210*C, which is under a pressure of from 2100 to 4000 atmospheres and which contains ethylene, from 2 to 100 mole ppm (with reference to ethylene) of a free-radical polymerization initiator and from 40 to 60% by weight of the amount of the polymerization regulator propionaldehyde introduced per 100 parts by weight of ethylene into the second reaction zone; with the proviso that the ratio by weight of the mixture introduced per unit time into the first and second reaction zones is from 1:2 and 2:1 and, when there is a third reaction zone, the ratio by weight of the mixture introduced per unit time into the second and third reaction zones is from 1:2 to 2:1.
Claim 11
Dependent Claim
134 words
AT THE BEGINING OF THE THIRD REACTION ZONE A MIXTURE IS INTRODUCED WHICH HAS A TEMPERATURE OF FROM 170* TO 210*C, WHICH IS UNDER PRESSUREOF FROM 2100 TO 4000 ATMOSPHERES AND WHICH CONTAINS ETHYLENE, FROM 2 TO 100 MOLE PPM (WITH REFERENCE TO ETHYLENE) OF A FREE-RADICAL POLYMERIZATION INITATOR AND FROM 40 TO 60% BY WEIGHT OF THE AMOUNT OF THE POLYMERIZATION REGULATOR PROPIONALDEHYDE INTRODUCED PER 100 PARTS BY WEIGHT OF ETHYLENE INTO THE SECOND REACTION ZONE, WITH THE PROVISO THAT THE RATIO BY WEIGHT OF THE MIXTURE INTRODUCED PER UNIT TIME INTO THE FIRST AND SECOND REACTION ZONES IS FROM 1:2 AND 2:1 AND, WHEN THERE IS THIRD REACTION ZONE, THE RATIO BY WEIGHT OF THE MIXTURE INTRODUCED PER UNIT TIME INTO THE SECOND AND THIRD REACTION ZONES IS FROM 1:2 TO 2:1.
Claim 12
Dependent Claim
134 words
AT THE BEGINING OF THE THIRD REACTION ZONE A MIXTURE IS INTRODUCED WHICH HAS A TEMPERATURE OF FROM 170* TO 210*C, WHICH IS UNDER PRESSUREOF FROM 2100 TO 4000 ATMOSPHERES AND WHICH CONTAINS ETHYLENE, FROM 2 TO 100 MOLE PPM (WITH REFERENCE TO ETHYLENE) OF A FREE-RADICAL POLYMERIZATION INITATOR AND FROM 40 TO 60% BY WEIGHT OF THE AMOUNT OF THE POLYMERIZATION REGULATOR PROPIONALDEHYDE INTRODUCED PER 100 PARTS BY WEIGHT OF ETHYLENE INTO THE SECOND REACTION ZONE, WITH THE PROVISO THAT THE RATIO BY WEIGHT OF THE MIXTURE INTRODUCED PER UNIT TIME INTO THE FIRST AND SECOND REACTION ZONES IS FROM 1:2 AND 2:1 AND, WHEN THERE IS THIRD REACTION ZONE, THE RATIO BY WEIGHT OF THE MIXTURE INTRODUCED PER UNIT TIME INTO THE SECOND AND THIRD REACTION ZONES IS FROM 1:2 TO 2:1.
References Cited (Backward Citations)
US3334081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |