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Patent US4798818A successfully refreshed from Google Patents.
US4798818A
Expired / Lapsed
US
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Catalyst composition and process for its preparation
Assignee: Dow Silicones Corp
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Filing: 1987-11-27
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Granted: 1989-01-17
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Expires: 2007-11-27
Abstract
Abstract What is described is a process for preparing a more effective catalyst for the vapor-phase reaction of 1,1,1,3-tetrachloropropane with anhydrous hydrogen fluoride to produce 3,3,3-triflurorpropene-1. The process comprises (A) mechanically mixing, in the absence of water, of (i) aluminum fluoride which has been prepared at temperatures less than about 400° C. and (ii) a transition metal compound, the transition metal compound being selected from a group consisting of compounds of cobalt, chromium, iron, manganese, nickel, titanium, and vanadium; and (B) contacting the mechanical mixture with sufficient anhydrous HF to convert the transition metal compound to a transition metal fluoride. Also described is the catalyst. Additionally, a process for the preparation of 3,3,3-trifluoropropene-1 in which the catalyst is utilized is described.
Inventors
- 👤 William X. Baizer
- 👤 Robert L. Bixler, Jr.
- 👤 Michael D. Meddaugh
- 👤 Antony P. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:31
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/22; B01J37/26; B01J27/00; B01J27/06; B01J27/08; B01J27/12; C; C07; C07C; C07C17/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
107 words
A process for preparing a catalyst, said process comprising (A) providing aluminum fluoride, said aluminum fluoride having been prepared at a temperature less than about 500° C.; (B) mechanically mixing, without water, the aluminum fluoride with a transition metal compound selected from a group consisting of compounds of cobalt, chromium, iron, manganese, nickel, titanium, and vanadium; and (C) contacting the mechanical mixture of aluminum fluoride and the transition metal compound with sufficient gaseous anhydrous hydrogen fluoride to convert the transition metal compound to a transition metal fluoride, said mechanical mixture being heated to a temperature greater than about 150° C. in the presence of anhydrous hydrogen fluoride.
Claim 2
Dependent Claim
107 words
A process for preparing a catalyst, said process comprising (A) providing aluminum fluoride, said aluminum fluoride having been prepared at a temperature less than about 500° C.; (B) mechanically mixing, without water, the aluminum fluoride with a transition metal compound selected from a group consisting of compounds of cobalt, chromium, iron, manganese, nickel, titanium, and vanadium; and (C) contacting the mechanical mixture of aluminum fluoride and the transition metal compound with sufficient gaseous anhydrous hydrogen fluoride to convert the transition metal compound to a transition metal fluoride, said mechanical mixture being heated to a temperature greater than about 150° C. in the presence of anhydrous hydrogen fluoride.
Claim 3
Dependent Claim
21 words
A process according to claim 1, wherein the aluminum fluoride has been prepared at a temperature of 400° C. or less.
Claim 4
Dependent Claim
14 words
A process according to claim 1, wherein the aluminum fluoride is anhydrous aluminum fluoride.
Claim 5
Dependent Claim
14 words
A process according to claim 1, wherein the aluminum fluoride is hydrated aluminum fluoride.
Claim 6
Dependent Claim
53 words
A process according to claim 4, wherein water of hydration is removed from the hydrated aluminum fluoride by heating the hydrated aluminum fluoride to a temperature sufficient to essentially remove all water of hydration, but less than about 400° C., prior to the mechanical mixing of the aluminum fluoride with the metal compound.
Claim 7
Dependent Claim
52 words
A process according to claim 4, wherein water of hydration is removed from the hydrated aluminum fluoride by heating the hydrated aluminum fluoride to a temperature sufficient to essentially remove all water of hydration, but less than about 400° C., after the mechanical mixing of the aluminum fluoride with the metal compound.
Claim 8
Dependent Claim
11 words
A catalyst composition prepared according to the process of claim 1.
Claim 9
Dependent Claim
15 words
A catalyst composition according to claim 7, wherein the aluminum fluoride is anhydrous aluminum fluoride.
Claim 10
Dependent Claim
15 words
A catalyst composition according to claim 7, wherein the aluminum fluoride is hydrated aluminum fluoride.
Claim 11
Dependent Claim
26 words
A catalyst composition according to claim 7, wherein the transition metal compound is selected from a group consisting of compounds of cobalt, chromium, iron, and nickel.
Claim 12
Dependent Claim
17 words
A catalyst composition according to claim 10, wherein the transition metal compound is a compound of iron.
Claim 13
Dependent Claim
41 words
A catalyst composition according to claim 7, wherein the transition metal compound is present in an amount in said catalyst composition such that transition metal content of the transition metal compound is greater than about 1 weight percent of catalyst weight.
Claim 14
Dependent Claim
45 words
A catalyst composition according to claim 12, wherein the transition metal compound is present in an amount in said catalyst composition such that transition metal content of the transition metal compound is in a range from about 1 to 9 weight percent of catalyst weight.
Claim 15
Dependent Claim
15 words
A catalyst composition according to claim 7, wherein the metal compound is cobalt (II) chloride.
Claim 16
Dependent Claim
15 words
A catalyst composition according to claim 7, wherein the metal compound is chromium (III) chloride.
Claim 17
Dependent Claim
15 words
A catalyst composition according to claim 7, wherein the metal compound is iron (III) chloride.
Claim 18
Dependent Claim
15 words
A catalyst composition according to claim 7, wherein the metal compound is iron (III) oxide.
Claim 19
Dependent Claim
16 words
A catalyst composition according to claim 7, wherein the metal compound is a nickel (II) chloride.
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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) | 1992-01-17 | 1992-07-18 | 1993-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-17 | 1996-07-18 | 1997-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-17 | 2000-07-18 | 2001-01-17 | $7700.00 | Window Closed / Lapsed |