EP0143634A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Processfor the preparation of butane-1.4-diol
Assignee: Johnson Matthey Davy Technologies Ltd
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Filing: 1984-11-26
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Granted: —
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Expires: 2004-11-26
Abstract
Abstract A process for the production of butane-1,4-diol comprises hydrogenating a di-(C<sub>1</sub> to C<sub>3</sub> alkyl) ester of a C<sub>4</sub> dicarboxylic acid, e.g. an ester of a but-2-en-1,4-dioic acid, such as diethyl maleate, in the vapour phase at a temperature of from about 150°C to about 240°C and at a pressure in the range of from about 25 bar to about 75 bar in the presence of a reduced copper chromite catalyst, and recovering resulting butane--1,4-diol containing reaction product. The catalyst contains, before reduction, from about 25 to about 45% by weight of copper and from about 20 to about 35% by weight of chromium and preferably has an internal surface area of at least about 30 sq. m. per gram. The process is preferably conducted in two or more reaction zones, which are preferably operated adiabatically, the feed temperature to the first zone being higher than that to at least one subsequent reaction zone.
Inventors
- 👤 Mohammad Sharif
- 👤 Keith Turner
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 10:32
CPC Classifications
C; C07; C07D; C07D315/00; C07C; C07C31/00; C07C31/18; C07C31/20; C07C29/00; C07C29/132; C07C29/136; C07C29/147; C07C29/149; C07C29/17; C07C29/177; C07D317/00; C07D317/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
109 words
A process for the production of butane-1,4-diol which comprises hydrogenating a di-(C l to C 3 alkyl) ester of a C 4 dicarboxylic acid in the vapour phase at a temperature of from about 150°C to about 240°C and at a pressure in the range of from about 25 bar to about 75 bar for example in the range of from about 35 bar to about 45 bar, in the presence of a reduced copper chromite catalyst which contains, before reduction, from about 25 to about 45% by weight of copper and from about 20 to about 35% by weight of chromium, and recovering resulting butane-1,4-diol containing reaction product.
Claim 2
Dependent Claim
109 words
A process for the production of butane-1,4-diol which comprises hydrogenating a di-(C l to C 3 alkyl) ester of a C 4 dicarboxylic acid in the vapour phase at a temperature of from about 150°C to about 240°C and at a pressure in the range of from about 25 bar to about 75 bar for example in the range of from about 35 bar to about 45 bar, in the presence of a reduced copper chromite catalyst which contains, before reduction, from about 25 to about 45% by weight of copper and from about 20 to about 35% by weight of chromium, and recovering resulting butane-1,4-diol containing reaction product.
Claim 3
Dependent Claim
20 words
A process according to claim 1, in which the ester is selected from diethyl maleate, diethyl fumarate and mixtures thereof.
Claim 4
Dependent Claim
29 words
A process according to claim 1, in which the H 2 :ester molar ratio in the vaporous mixture is in the range of from about 150:1 to about 800:1.
Claim 5
Dependent Claim
45 words
A process according to any one of claims 1 to 3, in which the catalyst is a reduced stabilised copper chromite catalyst containing not more than about 15% by weight of at least one stabilizer, which is preferably selected from barium, manganese, and mixtures thereof.
Claim 6
Dependent Claim
37 words
A process according to any one of claims 1 to 4, in which the catalyst contains from about 32 to about 38% by weight of copper and from about 22 to about 30% by weight of chromium.
Claim 7
Dependent Claim
33 words
A process according to claim 1, in which the catalyst has an internal surface area of at least about 30 sq. m. per gram, preferably at least about 60 sq. m. per gram.
Claim 8
Dependent Claim
37 words
A process according to any one of claims 1 to 6, in which the ester is supplied at a rate corresponding to a liquid hourly space velocity of from about 0.1 to about 0.6 hr- 1 .
Claim 9
Dependent Claim
42 words
A process according to any one of claims 1 to 7, in which a vaporous mixture containing ester and hydrogen is passed over the catalyst at a gaseous hourly space velocity of from about 2500 to about 85000 h r -1 .
Claim 10
Dependent Claim
49 words
A process according to any one of claims 1 to 8, in which the reaction is conducted in at least two hydrogenolysis zones in sequence, preferably operated adiabatically, the feed temperature to the first hydrogenolysis zone being higher than the feed temperature to at least one subsequent hydrogenolysis zone.
Claim 11
Dependent Claim
50 words
A process according to ciaim 9, in which there are two hydrogenolysis zones the feed temperature to the first hydrogenolysis zone lying in the range of from about 170°C to about 190°C and that to the second hydrogenolysis zone lying in the range of from about 160°C to about 175°C.
Claim 12
Dependent Claim
50 words
A process according to ciaim 9, in which there are two hydrogenolysis zones the feed temperature to the first hydrogenolysis zone lying in the range of from about 170°C to about 190°C and that to the second hydrogenolysis zone lying in the range of from about 160°C to about 175°C.
References Cited (Backward Citations)
No citation records indexed.
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