Patent US4253988A successfully refreshed from Google Patents.
US4253988A
Expired / Lapsed
US
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Conditioning phosphorus-vanadium-oxygen catalyst
Assignee: Huntsman Corp
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Filing: 1979-10-26
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Granted: 1981-03-03
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Expires: 1999-10-26
Abstract
Abstract In the preparation of phosphorus-vanadium-oxygen catalyst, where vanadium and phosphorus are contacted under conditions to provide a catalyst precursor with vanadium in the tetravalent state, and the precursor is formed into agglomerations and subsequently calcined at high temperatures, the improvement which comprises wetting the catalyst precursor with an aqueous liquid in an amount sufficient to enhance surface adhesion prior to calcining.
Inventors
- 👤 Ramon A. Mount
- 👤 Warn D. Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:17
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215; B; B01; B01J; B01J23/00; B01J23/002; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J37/00; B01J37/0009; B01J2523/00; Y; Y10; Y10S; Y10S502/00; Y10S502/50; Y10S502/504; Y10S502/506; Y10S502/513
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
117 words
In a process for preparing phosphorus-vanadium-oxygen complex catalysts having a phosphorus to vanadium atom ratio in the range of about 1:2 to about 2:1, the process comprising: (a) contacting vanadium and phosphorus compounds under conditions which will provide a catalyst precursor wherein greater than 50 atom % of the vanadium is in the tetravalent state; (b) recovering the catalyst precursor; (c) forming the catalyst precursor into agglomerates; and (d) calcining the catalyst precursor agglomerations at a temperature between about 300° C. and 600° C., the improvement comprising wetting the catalyst precursor with an aqueous liquid in an amount sufficient to enhance surface adhesion prior to calcining and then drying the catalyst precursor whereby attrition is substantially reduced.
Claim 2
Dependent Claim
117 words
In a process for preparing phosphorus-vanadium-oxygen complex catalysts having a phosphorus to vanadium atom ratio in the range of about 1:2 to about 2:1, the process comprising: (a) contacting vanadium and phosphorus compounds under conditions which will provide a catalyst precursor wherein greater than 50 atom % of the vanadium is in the tetravalent state; (b) recovering the catalyst precursor; (c) forming the catalyst precursor into agglomerates; and (d) calcining the catalyst precursor agglomerations at a temperature between about 300° C. and 600° C., the improvement comprising wetting the catalyst precursor with an aqueous liquid in an amount sufficient to enhance surface adhesion prior to calcining and then drying the catalyst precursor whereby attrition is substantially reduced.
Claim 3
Dependent Claim
12 words
The process improvement of claim 1 wherein the aqueous liquid is water.
Claim 4
Dependent Claim
13 words
The process improvement of claim 1 wherein the aqueous liquid comprises an alcohol.
Claim 5
Dependent Claim
10 words
The process of claim 3 wherein the alcohol is methanol.
Claim 6
Dependent Claim
13 words
The process improvement of claim 1 wherein the aqueous liquid comprises a ketone.
Claim 7
Dependent Claim
10 words
The process of claim 5 wherein the ketone is acetone.
Claim 8
Dependent Claim
17 words
The process improvement of claim 1 wherein the catalyst precursor is wetted after being formed into agglomerations.
Claim 9
Dependent Claim
20 words
The process improvement of claim 1 wherein the catalyst precursor is wetted before the catalyst precursor is formed into agglomerations.
Claim 10
Dependent Claim
19 words
The process improvement of claim 1 wherein the catalyst precursor is wetted before and after being formed into agglomerates.
Claim 11
Dependent Claim
11 words
The process improvement of claim 1 wherein the agglomerates are granules.
Claim 12
Dependent Claim
12 words
The process improvement of claim 1 wherein the agglomerates are broken slugs.
Claim 13
Dependent Claim
11 words
The process improvement of claim 1 wherein the agglomerates are nodules.
Claim 14
Dependent Claim
11 words
The process improvement of claim 1 wherein the agglomerates are tablets.
Claim 15
Dependent Claim
11 words
The process improvement of claim 1 wherein the agglomerates are pills.
Claim 16
Dependent Claim
18 words
The process improvement of claim 1 wherein a surfactant is employed in the preparation of the catalyst precursor.
Claim 17
Dependent Claim
16 words
The process improvement of claim 1 wherein drying is accomplished at a temperature of 70°-250° C.
Claim 18
Dependent Claim
16 words
The process improvement of claim 1 wherein drying is accomplished at a temperature of 100°-150° C.
Claim 19
Dependent Claim
17 words
The process improvement of claim 1 wherein drying is accomplished at a temperature of about 125° C.
Claim 20
Dependent Claim
11 words
A phosphorus-vanadium-oxygen catalyst prepared by the improved process of claim 1.
Claim 21
Dependent Claim
12 words
The catalyst of claim 19 having a percent attrition less than 2%.
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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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |