US3887494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin polymerization catalyst
Assignee: Phillips Petroleum Co
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Filing: 1973-05-24
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Granted: 1975-06-03
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Expires: 1993-05-24
Abstract
Abstract A method for preparing a composition of matter comprising silica and titanium, convertible to a catalyst suitable for olefin polymerization by the addition of chromium and the process performable therewith, the preparation involving adding an alkali metal silicate to an acid containing a titanium compound, and recovering a dry gel for use as a polymerization catalyst upon the addition of chromium.
Inventors
- 👤 Richard E Dietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:39
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; C; C08; C08F; C08F10/00; C08F210/00; C08F210/16
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
117 words
A METHOD OF PREPARING ASILICA-CONTAINING COMPOSITION CATALYTICALLY ACTIVE FOR OLEFIN POLYMERIZATION COMPRISING A. ADDING A TITANIUM COMPOUND TO A MINERAL ACID; B. INTRODUCING AN ALKALI METAL SILICATE INTO THE ACID CONTAINING SAID TITANIUM COMPOUND TO FORM AHYDROGEL; C. AGING THE HYDROGEL FOR A TIME OF GREATER THAN ONE HOUR; D. WASHING THE THUS AGED HYDROGEL TO PRODUCE A SUBSTANTIALLY ALKALI METAL-FREE HYDROGEL; E. FORMING AMIXTURE COMPRISING THE THUS WASHED HYDROGEL AND A NORMALLY LIQUID OXYGEN-CONTAINING, WATER SOLUBLE ORGANIC COMPOUND; F. SEPARATING SAID ORGANIC COMPOUND AND WATER FROM SAID MIXTURE TO FORM A XEROGEL; AND, G. HEATING SAID XEROGEL ALSO CONTAINING CHROMIUM AT A TEMPERATURE OF 900* TO 1800*F TO PRODUCE A COMPOSITION CATALYTICALLY ACTIVE FOR OLEFIN POLYMERZATION.
Claim 2
Independent Claim
117 words
A METHOD OF PREPARING ASILICA-CONTAINING COMPOSITION CATALYTICALLY ACTIVE FOR OLEFIN POLYMERIZATION COMPRISING A. ADDING A TITANIUM COMPOUND TO A MINERAL ACID; B. INTRODUCING AN ALKALI METAL SILICATE INTO THE ACID CONTAINING SAID TITANIUM COMPOUND TO FORM AHYDROGEL; C. AGING THE HYDROGEL FOR A TIME OF GREATER THAN ONE HOUR; D. WASHING THE THUS AGED HYDROGEL TO PRODUCE A SUBSTANTIALLY ALKALI METAL-FREE HYDROGEL; E. FORMING AMIXTURE COMPRISING THE THUS WASHED HYDROGEL AND A NORMALLY LIQUID OXYGEN-CONTAINING, WATER SOLUBLE ORGANIC COMPOUND; F. SEPARATING SAID ORGANIC COMPOUND AND WATER FROM SAID MIXTURE TO FORM A XEROGEL; AND, G. HEATING SAID XEROGEL ALSO CONTAINING CHROMIUM AT A TEMPERATURE OF 900* TO 1800*F TO PRODUCE A COMPOSITION CATALYTICALLY ACTIVE FOR OLEFIN POLYMERZATION.
Claim 3
Independent Claim
121 words
A method of preparing a silica-containing composition catalytically active for olefin polymerization comprising: a. adding a titanium compound to a mineral acid; b. introducing an alkali metal silicate into the acid containing said titanium compound to form a hydrogel; c. aging the hydrogel for a time of greater than one hour; d. washing the thus aged hydrogel to produce a substantially alkali metal-free hydrogel; e. forming a mixture comprising the thus washed hydrogel and a normally liquid oxygen-containing, water soluble organic compound; f. separating said organic compound and water from said mixture to form a xerogel; and, g. heating said xerogel also containing chromium at a temperature of 900* to 1800* F to produce a composition catalytically active for olefin polymerization.
Claim 4
Independent Claim
121 words
A method of preparing a silica-containing composition catalytically active for olefin polymerization comprising: a. adding a titanium compound to a mineral acid; b. introducing an alkali metal silicate into the acid containing said titanium compound to form a hydrogel; c. aging the hydrogel for a time of greater than one hour; d. washing the thus aged hydrogel to produce a substantially alkali metal-free hydrogel; e. forming a mixture comprising the thus washed hydrogel and a normally liquid oxygen-containing, water soluble organic compound; f. separating said organic compound and water from said mixture to form a xerogel; and, g. heating said xerogel also containing chromium at a temperature of 900* to 1800* F to produce a composition catalytically active for olefin polymerization.
Claim 5
Dependent Claim
19 words
The method of claim 1 in which said titanium-containing compound comprises a compound convertible to titanium oxide upon calcination.
Claim 6
Dependent Claim
42 words
The method of claim 1 in which said silica-containing composition is activated to convert said titanium compound to an oxide, the amount of said oxide in the activated composition being within the range of from about 1 to about 10 weight percent.
Claim 7
Dependent Claim
13 words
The method of claim 1 in which said titanium compound is titanium tetrachloride.
Claim 8
Dependent Claim
17 words
The method of claim 1 in which said acid contains a chromium-containing compound convertible to chromium oxide.
Claim 9
Dependent Claim
43 words
The method of claim 5 in which said silica-containing composition is activated to convert said chromium compound to an oxide, the amount of the chromium oxide in the activated composition being within the range of from about 0.1 to about 50 weight percent.
Claim 10
Dependent Claim
13 words
The method of claim 5 in which said chromium-containing compound is chromium nitrate.
Claim 11
Dependent Claim
20 words
The method of claim 5 wherein said aging is at a temperature within the range of 65 to 200* F.
Claim 12
Dependent Claim
23 words
The method of claim 1 wherein said xerogel is impregnated with a chromium compound prior to heating to said temperature of 900*to 1800*F.
Claim 13
Dependent Claim
50 words
A method according to claim 1 wherein said alkali metal silicate is added to said acid at a temperature within the range of 33*-110*F until a final pH within the range of 3-9 is reached, said resulting hydrogel having a concentration of SiO2 within the range of 3-12 weight percent.
Claim 14
Dependent Claim
24 words
A method according to claim 1 wherein said washing is done with either an ammonium salt solution or a dilute acid and with water.
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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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |