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Method for co-producing 1,4-butanediol, gamma-butyrolactone and butanol

A technology of butanediol and butyrolactone, which is applied in the field of γ-butyrolactone and butanol to co-produce 1,4-butanediol, which can solve the impact, waste of 1,4-butanediol, butanol by-products Production waste and other issues, to achieve the effect of improving economy, increasing output and good technical effect

Active Publication Date: 2015-02-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the presence of impurity acetal in the prior art affects the product quality of 1,4-butanediol. In order to improve product quality, only part of 1,4-butanediol can be lost, resulting in 1,4-butanediol Butanediol waste, and the problem of waste of valuable by-products due to non-recovery of butanol, providing a new method for the co-production of 1,4-butanediol, γ-butyrolactone and butanol

Method used

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  • Method for co-producing 1,4-butanediol, gamma-butyrolactone and butanol
  • Method for co-producing 1,4-butanediol, gamma-butyrolactone and butanol

Examples

Experimental program
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Effect test

Embodiment 1

[0027] use figure 1 and figure 2 As shown in the process, the crude 1,4-butanediol stream 10 enters the light tower, and is separated by rectification. The side stream obtains stream 12, the top of the tower obtains stream 11 rich in methanol, and the tower reactor obtains stream 1; stream 11 enters the subsequent process . Stream 1 enters the heavy column and is separated by rectification. Stream 3 rich in γ-butyrolactone is distilled from the top of the tower, and stream 2 containing 1,4-butanediol and acetal is extracted from the side line. Stream 2 enters the 1,4-butanediol product tower, and is separated by rectification. A small amount of 1,4-butanediol carries acetal (stream 4) from the top of the tower, and most of the 1,4-butanediol ( Stream 5) is withdrawn from the side line. Stream 5 enters the 1,4-butanediol stripping tower, and both the overhead fraction and the effluent from the bottom of the tower are returned to the 1,4-butanediol product tower for further ...

Embodiment 2

[0047] With [embodiment 1], only raw material composition changes, operating condition changes.

[0048] The composition of the crude 1,4-butanediol stream 10 is: the weight content of 1,4-butanediol is 48.80%, the weight content of acetal is 0.11%, and the weight content of γ-butyrolactone is 7.12%, The weight content of butanol is 0.44%.

[0049] The operating conditions of the light column are: the temperature of the bottom of the tower is 197.7°C, the temperature of the top of the tower is 45°C, the operating pressure is 0.04MPa, and the reflux ratio is 1.9.

[0050] The operating conditions of the heavy column are: the temperature of the bottom of the tower is 200.7°C, the temperature of the top of the tower is 143.8°C, the operating pressure is 0.019MPa, and the reflux ratio is 5.1.

[0051] The operating conditions of the 1,4-butanediol product column are as follows: the temperature at the bottom of the column is 185.9°C, the temperature at the top of the column is 161...

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Abstract

The invention relates to a method for co-producing 1,4-butanediol, gamma-butyrolactone and butanol, mainly for solving the problem that 1,4-butanediol is wasted as the impurity (acetal) affects the product quality of 1,4-butanediol, a part of 1,4-butanediol has to be lost to improve the product quality, and the valuable byproduct are wasted as butanol is not recycled in the prior art. The method comprises the following steps of: a: feeding a crude 1,4-butanediol material flow into a light tower, so as to obtain a material flow 12 on a side line, a material flow rich in methanol at the top of the tower, and a material flow 1 from a tower kettle; b: feeding the material flow 1 into a heavy tower, so as to obtain a material flow 2 and a material flow 3 rich in gamma-butyrolactone; c) feeding the material flow 2 into a 1,4-butanediol product tower, so as to obtain a material flow 4 and a material flow 5 rich in 1,4-butanediol; d) feeding the material flow 5 into a 1,4-butanediol stripping tower for stripping extraction, so as to obtain a 1,4-butanediol product; e) feeding the material flow 4 into a dehydrogenation reactor and reacting so as to a material flow 6; f) feeding the material 3 and the material 6 into a gamma-butyrolactone refining unit for refining, so as to obtain gamma-butyrolactone and a material flow 8 containing acetal; g) feeding the material flow 12 into a butanol recycling unit, so as to obtain a butanol product. By utilizing the technical scheme, the problems in the prior art are well solved, and the method can be applied to industrial production for co-producing 1,4-butanediol, gamma-butyrolactone and butanol.

Description

technical field [0001] The invention relates to a method for co-producing 1,4-butanediol, γ-butyrolactone and butanol. Background technique [0002] 1,4-Butanediol (BDO) is an important organic chemical product, mainly used in the production of polybutylene terephthalate (PBT), γ-butyrolactone (GBL), polyurethane (PU) and Tetrahydrofuran, etc. In recent years, the demand in the domestic market has rapidly increased with the development of downstream industries such as PBT resin and spandex, and 1,4-butanediol has been in a state of short supply in China. Butanol is also an important organic chemical product, mainly used in the manufacture of n-butyl ester plasticizers of phthalic acid, aliphatic dibasic acid and phosphoric acid, which are widely used in various plastic and rubber products, and are also organic It is the raw material for the production of butyraldehyde, butyric acid, butylamine and butyl lactate in the synthesis. γ-butyrolactone is also an important organi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/76C07C31/12C07D307/33
Inventor 李真泽贾微贾震陈迎陈泱张艺张翼许慎艳
Owner CHINA PETROLEUM & CHEM CORP