Patent US1653075A successfully refreshed from Google Patents.
Patent US4062900A successfully refreshed from Google Patents.
US4062900A
Expired / Lapsed
US
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Process for preparing butanediol and/or butenediol
Assignee: Mitsubishi Chemical Corp
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Filing: 1976-07-15
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Granted: 1977-12-13
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Expires: 1996-07-15
Abstract
Abstract Butanediol and/or butenediol are prepared by hydrolyzing diacetoxybutane and/or diacetoxybutene in the presence of a cation-exchange resin and recovered by fractional distillation. By the treatment of the hydrolyzed product with an anion exchange resin at any stage before the butanediol and/or butenediol are fractionated, butanediol and/or butenediol are recovered in high yield.
Inventors
- 👤 Yasuo Tanabe
- 👤 Jun Toriya
- 👤 Masato Sato
- 👤 Ken Shiraga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:46
CPC Classifications
C; C07; C07C; C07C31/00; C07C31/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
In a process for preparing butanediol or butenediol by hydrolyzing diacetoxybutane or diacetoxybutene in the presence of a cation-exchange resin having at least one sulfo group as a functional group, and recovering butanediol or butenediol from the hydrolyzed product by distillation, the improvement which comprises treating the hydrolyzed product containing butanediol or butenediol with a weak anion-exchange resin which has a primary, secondary or tertiary amine groups at a temperature of 20° to 100° C at any stage before the butanediol or butenediol are fractionated.
Claim 2
Dependent Claim
85 words
In a process for preparing butanediol or butenediol by hydrolyzing diacetoxybutane or diacetoxybutene in the presence of a cation-exchange resin having at least one sulfo group as a functional group, and recovering butanediol or butenediol from the hydrolyzed product by distillation, the improvement which comprises treating the hydrolyzed product containing butanediol or butenediol with a weak anion-exchange resin which has a primary, secondary or tertiary amine groups at a temperature of 20° to 100° C at any stage before the butanediol or butenediol are fractionated.
Claim 3
Dependent Claim
19 words
A process for preparing butanediol or butenediol according to claim 1 wherein butanediol or butenediol is 1,4-butanediol or 1,4-butenediol.
Claim 4
Dependent Claim
22 words
A process for preparing butanediol or butenediol according to claim 1 wherein the weak anion-exchange resin has primary or secondary amine groups.
Claim 5
Dependent Claim
14 words
A process according to claim 1 wherein said temperature is 50° to 80° C.
Claim 6
Dependent Claim
37 words
A process for preparing butanediol or butenediol according to claim 1 wherein the anion-exchange resin is used in an amount from 0.0001 to 1 part by weight per one part by weight of the acid cation-exchange resin.
Claim 7
Dependent Claim
38 words
A process for preparing butanediol or butenediol according to claim 1 wherein the treatment is carried out by introducing the hydrolyzed product at a space velocity of 1000 to 0.1 hr -1 to a bed of anion-exchange resin.
Claim 8
Dependent Claim
37 words
A process for preparing butanediol or butenediol according to claim 1 wherein the distillation and the fractionation are carried out in a distillation column, the bottom of which is maintained within the range 150° to 220° C.
Claim 9
Dependent Claim
21 words
A process according to claim 7 wherein the space velocity is from 100 to 1 hr. to the exponent -1 .
References Cited (Backward Citations)
CA470663A
Cited
US2868832A
Cited
US3647892A
Cited
US3891511A
Cited
US3852164A
Cited
US3917720A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |