US3879362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerisation process
Assignee: BP Chemicals Ltd
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Filing: 1973-06-08
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Granted: 1975-04-22
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Expires: 1993-06-08
Abstract
Abstract Process for polymerising ethylene using a catalyst prepared by (1) heating together a titanium compound and a support material selected from silica, alumina, zirconia, thoria or composites thereof and (2) heating the product from (1) with a chromium compound at a temperature in the range 350*-550*C to produce an active catalyst.
Inventors
- 👤 Geoffrey Reginald Chalfont
- 👤 Ronald Alfred Crump
- 👤 Prem Sagar Thukral
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:27
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
66 words
A PROCESS FOR THE PREPARATION OF A POLYMERISATION CATALYST COMPRISING (I) HEATING TOGETHER A SUPPORT MATERIAL COMPRISING SILICA, ALUMINA, ZIRCONIA OR THORIA OR COMPOSITES THEREOF AND A TITANIUM COMPOUND AT A TEMPERATURE IN THE RANGE 150*-1,200*C AND (II) INCORPORATING IN THE PRODUCT FROM (I) UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS A CHROMIUM COMPOUND AND HEATING AT A TEMPERATURE IN THE RANGE 100*-1,700*C TO PRODUCE AN ACTIVE POLYMERISATION CATALYST.
Claim 2
Dependent Claim
66 words
A PROCESS FOR THE PREPARATION OF A POLYMERISATION CATALYST COMPRISING (I) HEATING TOGETHER A SUPPORT MATERIAL COMPRISING SILICA, ALUMINA, ZIRCONIA OR THORIA OR COMPOSITES THEREOF AND A TITANIUM COMPOUND AT A TEMPERATURE IN THE RANGE 150*-1,200*C AND (II) INCORPORATING IN THE PRODUCT FROM (I) UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS A CHROMIUM COMPOUND AND HEATING AT A TEMPERATURE IN THE RANGE 100*-1,700*C TO PRODUCE AN ACTIVE POLYMERISATION CATALYST.
Claim 3
Dependent Claim
66 words
A process for the preparatIon of a polymerisation catalyst comprising (I) heating together a support material comprising silica, alumina, zirconia or thoria or composites therof and a titanium compound at a temperature in the range 150*-1,200*C and (II) incorporating in the product from (I) under substantially anhydrous conditions a chromium compound and heating at a temperature in the range 100*-1,700*C to produce an active polymerisation catalyst.
Claim 4
Dependent Claim
66 words
A process for the preparatIon of a polymerisation catalyst comprising (I) heating together a support material comprising silica, alumina, zirconia or thoria or composites therof and a titanium compound at a temperature in the range 150*-1,200*C and (II) incorporating in the product from (I) under substantially anhydrous conditions a chromium compound and heating at a temperature in the range 100*-1,700*C to produce an active polymerisation catalyst.
Claim 5
Dependent Claim
12 words
A process according to claim 1 wherein the support material is silica.
Claim 6
Dependent Claim
19 words
A process according to claim 2 wherein the silica has a surface area of 200 to 600 meters2g 1.
Claim 7
Dependent Claim
18 words
A process according to claim 2 wherein the pore volume of the silica is at least 0.5 ml/g.
Claim 8
Dependent Claim
14 words
A process according to claim 1 wherein the titanium compound is a tetra-alkyl titanate.
Claim 9
Dependent Claim
15 words
A process according to claim 5 wherein the titanium compound is tetraethyl or tetraisopropyl titanate.
Claim 10
Dependent Claim
29 words
A process according to claim 1 wherein the quantity of titanium compound is in the range 2.0 to 6.0 wt % based on the weight of the support material.
Claim 11
Dependent Claim
24 words
A process according to claim 1 wherein the quantity of titanium compound is the maximum amount that can be chemisorbed by the support material.
Claim 12
Dependent Claim
13 words
A process according to claim 1 wherein the chromium compound is ditertiarybutyl chromate.
Claim 13
Dependent Claim
31 words
A process according to claim 1 wherein the quantity of chromium in the catalyst is in the range 0.25 to 5.0 weight % based on the total weight of the catalyst.
Claim 14
Dependent Claim
27 words
A process according to claim 1 wherein the titanium compound is incorporated into the support material by adding it to a fluidised bed of the support material.
Claim 15
Dependent Claim
18 words
A process according to claim 11 wherein the titanium compound is passed as vapour into the fluidising gas.
Claim 16
Dependent Claim
21 words
A process according to claim 1 wherein the first stage heating (I) is carried out a temperature in the range 500*-900*C.
Claim 17
Dependent Claim
20 words
A process according to claim 1 wherein the second stage heating is carried out at a temperature at least 200*C.
Claim 18
Dependent Claim
21 words
A process according to claim 1 wherein the second stage heating is carried out at a temperature in the range 200*-400*C.
Claim 19
Dependent Claim
88 words
A process for polymerising ethylene or a mixture of ethylene and at least one other 1-olefin comprising contacting monomeric material under polymerisation conditions with a catalyst prepared by a process comprising (I) heating together a support material comprising silica, alumina, zirconia, thoria or composites thereof and a titanium compound at a temperature in the range 150*-1,200*C and (II) incorporating in the product from (I) under substantially anhydrous conditions a chromium compound and heating at a temperature in the range 100* to 1,200*C to produce an active polymerisation catalyst.
Claim 20
Dependent Claim
88 words
A process for polymerising ethylene or a mixture of ethylene and at least one other 1-olefin comprising contacting monomeric material under polymerisation conditions with a catalyst prepared by a process comprising (I) heating together a support material comprising silica, alumina, zirconia, thoria or composites thereof and a titanium compound at a temperature in the range 150*-1,200*C and (II) incorporating in the product from (I) under substantially anhydrous conditions a chromium compound and heating at a temperature in the range 100* to 1,200*C to produce an active polymerisation catalyst.
Claim 21
Dependent Claim
26 words
A process according to claim 16 wherein the polymerisation conditions are such that the polymer is formed as solid particles suspended in a liquid hydrocarbon diluent.
Claim 22
Dependent Claim
18 words
A process according to claim 16 wherein the polymerisation is carried out in the presence of hydrogen gas.
Claim 23
Dependent Claim
16 words
A process according to claim 16 wherein the polymerisation is carried out in the gas phase.
References Cited (Backward Citations)
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US3485771A
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US3780011A
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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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |