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Patent US3917682A successfully refreshed from Google Patents.
US3917682A
Expired / Lapsed
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Production of acetic acid by oxidation of butenes
Assignee: Kuraray Co Ltd
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Filing: 1970-05-21
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Granted: 1975-11-04
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Expires: 1990-05-21
Abstract
Abstract Acetic acid is produced in a high yield with good reproducibility by oxidizing butenes in the gas phase in the presence of a catalyst comprising vanadium oxide and titanium oxide, more than 50% of said titanium oxide being in a crystalline form of rutile.
Inventors
- 👤 Tetsuo Mizukami
- 👤 Takeshi Akahane
- 👤 Yoshio Fuchigami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:11
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
78 words
IN THE PROCESS FOR THE PRODUCTION OF ACETIC ACID BY GAS PHASE OXIDATION OF BUTENESS WITH MOLECULAR OXYGEN AT ELEVATED TEMPERATURES CHARACTERIZED BY PASSING THE BUTENE AND MOLECULAR OXYGEN AT ELEVATED TEMPERATURES OVER AN EFFECTIVE AMOUNT OF A CATALYST COMPRISING VANADIUM OXIDE AND TITANIUM OXIDE, THE IMPROVEMENT WHICH COMPRISES EMPLOYING A CATALYST WHEREIN THE ATOMIC RATIO OF VANADIUM TO TITANIUM IS 10:1 TO 1:10 AND MORE THAN 50% OF THE TITANIUM OXIDE IS IN THE RUTILE CRYSTALLINE FORM.
Claim 2
Dependent Claim
78 words
IN THE PROCESS FOR THE PRODUCTION OF ACETIC ACID BY GAS PHASE OXIDATION OF BUTENESS WITH MOLECULAR OXYGEN AT ELEVATED TEMPERATURES CHARACTERIZED BY PASSING THE BUTENE AND MOLECULAR OXYGEN AT ELEVATED TEMPERATURES OVER AN EFFECTIVE AMOUNT OF A CATALYST COMPRISING VANADIUM OXIDE AND TITANIUM OXIDE, THE IMPROVEMENT WHICH COMPRISES EMPLOYING A CATALYST WHEREIN THE ATOMIC RATIO OF VANADIUM TO TITANIUM IS 10:1 TO 1:10 AND MORE THAN 50% OF THE TITANIUM OXIDE IS IN THE RUTILE CRYSTALLINE FORM.
Claim 3
Dependent Claim
23 words
A process according to claim 1, wherein the oxidation is carried out at a temperature in the range of about 200*C. to 400*C.
Claim 4
Dependent Claim
17 words
A process according to claim 1, wherein the oxidation is carried out in the presence of steam.
Claim 5
Dependent Claim
18 words
A process according to claim 1, wherein the volume ratio of butene to oxygen is 1:3 or less.
Claim 6
Dependent Claim
14 words
A process according to claim 1, wherein the molecular oxygen is supplied as air.
Claim 7
Dependent Claim
26 words
A process according to claim 1, wherein the oxidation is carried out by using as the starting gas mixture a mixture containing butene, air and steam.
Claim 8
Dependent Claim
18 words
A process according to claim 6, wherein the volume ratio of steam to air is 0.1:1 to 0.7:1.
Claim 9
Dependent Claim
55 words
A process according to claim 1 wherein the catalyst is prepared by dissolving vanadium pentoxide and titanium tetrachloride in concentrated hydrochloric acid, neutralizing the acid solution at a temperature below 40*C. and calcining the resulting precipitate at a temperature in the range of about 450*C. to 600*C. in an atmosphere which is poor in oxygen.
Claim 10
Dependent Claim
60 words
A process for the production of acetic acid by gas phase oxidation of butenes with molecular oxygen at elevated temperatures which is characterized by passing a butene-butane fraction, air and steam over a catalytically effective amount of a solid catalyst comprising the vanadium oxide and titanium oxide, more than 50% of said titanium oxide being in the rutile crystalline form.
Claim 11
Dependent Claim
60 words
A process for the production of acetic acid by gas phase oxidation of butenes with molecular oxygen at elevated temperatures which is characterized by passing a butene-butane fraction, air and steam over a catalytically effective amount of a solid catalyst comprising the vanadium oxide and titanium oxide, more than 50% of said titanium oxide being in the rutile crystalline form.
Claim 12
Dependent Claim
85 words
In the process for the production of acetic acid by gas phase oxidation of butenes with molecular oxygen at elevated temperatures characterized by passing the butene and molecular oxygen at elevated temperatures over an effective amount of a catalyst comprising vanadium oxide and titanium oxide, the improvement which comprises employing a catalyst consisting of vanadium oxide and titanium oxide wherein the atomic ratio of vanadium to titanium is 10:1 to 1:10 and more than 50% of the titanium oxide is in the rutile crystalline form.
Claim 13
Dependent Claim
85 words
In the process for the production of acetic acid by gas phase oxidation of butenes with molecular oxygen at elevated temperatures characterized by passing the butene and molecular oxygen at elevated temperatures over an effective amount of a catalyst comprising vanadium oxide and titanium oxide, the improvement which comprises employing a catalyst consisting of vanadium oxide and titanium oxide wherein the atomic ratio of vanadium to titanium is 10:1 to 1:10 and more than 50% of the titanium oxide is in the rutile crystalline form.
Claim 14
Dependent Claim
12 words
The process of claim 10 wherein the catalyst contains an inert carrier.
References Cited (Backward Citations)
US3431297A
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 |