Patent US3843733A successfully refreshed from Google Patents.
US3843733A
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Method for producing 2-butene-1,4-diol
Assignee: Tosoh Corp
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Filing: 1972-12-20
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Granted: 1974-10-22
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Expires: 1992-12-20
Abstract
Abstract A method for selectively producing 2-butene-1,4-diol in the presence of a buffering amount of a water-soluble salt of a carboxylic acid and with the addition of alkali or a salt which shows alkalinity on hydrolytic dissociation.
Inventors
- 👤 Y Tsutsumi
- 👤 H Kisaki
- 👤 S Mabuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:20
CPC Classifications
C; C07; C07C; C07C33/00; C07C33/02; C07C33/025; C07C33/035
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
106 words
IN A PROCESS FOR PREPARING 2-BUTENE-1,4-DIOL BY HYDROLYSIS OF A 1,4-DIHALO-2-BUTENE SELECTED FROM THE GROUP CONSISTING OF 1,4-DICHLORO-2-BUTENE AND 1,4-DIBROMO-2-BUTENE, THE IMPROVEMENT WHICH COMPRISES CONTACTING SAID 1,4-DIHALO-2BUTENE WITH WATER AT A TEMPERATURE OF THE RANGE OF 105*-110*C., IN THE PRESENCE OF A WATER-SOLUBLE SALT SELECTED FROM THE GROUP CONSISTING OF AN ALKALI METAL SALT AND AN AMMONIUM SALT OF ACETIC ACID, PROPIONIC ACID, OXALIC ACID OR BUTRIC ACID AND IN THE PRESENCE OF AN ALKALINE MATERIAL SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND AMMONIA SUFFICIENT TO MAINTAIN THE REACTION SYSTEM IN THE RANGE OF PH 3 TO PH 11, WHEREBY 2-BUTENE-1,4-DIOL IS FORMED SELECTIVELY.
Claim 2
Dependent Claim
106 words
IN A PROCESS FOR PREPARING 2-BUTENE-1,4-DIOL BY HYDROLYSIS OF A 1,4-DIHALO-2-BUTENE SELECTED FROM THE GROUP CONSISTING OF 1,4-DICHLORO-2-BUTENE AND 1,4-DIBROMO-2-BUTENE, THE IMPROVEMENT WHICH COMPRISES CONTACTING SAID 1,4-DIHALO-2BUTENE WITH WATER AT A TEMPERATURE OF THE RANGE OF 105*-110*C., IN THE PRESENCE OF A WATER-SOLUBLE SALT SELECTED FROM THE GROUP CONSISTING OF AN ALKALI METAL SALT AND AN AMMONIUM SALT OF ACETIC ACID, PROPIONIC ACID, OXALIC ACID OR BUTRIC ACID AND IN THE PRESENCE OF AN ALKALINE MATERIAL SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE AND AMMONIA SUFFICIENT TO MAINTAIN THE REACTION SYSTEM IN THE RANGE OF PH 3 TO PH 11, WHEREBY 2-BUTENE-1,4-DIOL IS FORMED SELECTIVELY.
Claim 3
Dependent Claim
14 words
The process of claim 1, wherein the pH range is from 4 to 10.
Claim 4
Dependent Claim
11 words
The process of claim 1, wherein the 1,4-dihalo-2-butene is 1, 4-dichloro-2-butene.
Claim 5
Dependent Claim
15 words
The process of claim 1, wherein the alkali metal salt is an alkali metal acetate.
Claim 6
Dependent Claim
13 words
The process of claim 1, wherein the alkali metal salt is sodium acetate.
Claim 7
Dependent Claim
13 words
The process of claim 1, wherein the alkali metal salt is sodium butyrate.
Claim 8
Dependent Claim
12 words
The process of claim 1, wherein the ammonium salt is ammonium acetate.
Claim 9
Dependent Claim
12 words
The process of claim 1, wherein the alkaline material is sodium hydroxide.
Claim 10
Dependent Claim
11 words
The process of claim 1, wherein the alkaline material is ammonia.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |