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

A technology of tetrahydrofuran and butanediol, applied in chemical instruments and methods, preparation of organic compounds, chemical industry, etc., can solve problems such as loss, complicated operation, catalyst loss, etc., to reduce the number of replacements, simplify engineering operations, and avoid distribution. uneven effect

Active Publication Date: 2013-10-23
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in the prior art, the catalyst of the esterification unit is frequently replaced, resulting in cumbersome operation, serious loss of catalyst, uneven distribution of catalyst on the reaction tray, and at the same time, impurity acetal in the separation unit aff

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

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Embodiment 1

[0042] use figure 1 , figure 2 and Figure 4 The process shown, maleic anhydride 21 and methanol 22 enter the esterification unit R 1 , After the reaction, a stream 23 containing dimethyl maleate is obtained. Wherein, the maleic anhydride stream 21 and the first methanol stream 22-1 enter the monoesterification reactor R 1 , the reaction gives stream I containing monomethyl maleate. Stream I and the second methanol stream 22-2 enter the double esterification fixed bed reactor R from the bottom 2 , contact with the catalyst, and the stream 27 (i.e. stream II) containing monomethyl maleate and dimethyl maleate is obtained at the top of the tower; wherein, 85% by weight of monomethyl maleate in stream I is converted into maleic acid Acid dimethyl ester. Stream II enters the double-esterification catalytic distillation reaction tower T4 from the top, and the third methanol 22-3 enters the double-esterification catalytic distillation reaction tower T4 from the bottom. After ...

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Abstract

The invention relates to a method for producing 1,4-butanediol, tetrahydrofuran, gamma-butyrolactone and butanol. According to the technical scheme, double-esterification reaction is carried out in an esterification unit by virtue of the combination of a fixed bed reactor and a catalysis distilling tower; tetrahydrofuran is separated out of a reaction product, then butanol is separated out of the reaction product by using a butanol unit, a part of 1,4-butanediol with acetal is firstly separated out of a material flow containing 1,4-butanediol and gamma-butyrolactone, so as to obtain a 1,4-butanediol product which meets the purity requirement; 1,4-butanediol which is discharged together with acetal is converted into gamma-butyrolactone through dehydrogenation reaction, and the gamma-butyrolactone is fed into a gamma-butyrolactone refining unit together with acetal, so as to separate the acetal from the gamma-butyrolactone. The method can solve the problems in the prior art very well and can be applied to industrial production of 1,4-butanediol, tetrahydrofuran, gamma-butyrolactone and butanol.

Description

technical field [0001] The present invention relates to a method for producing 1,4-butanediol, tetrahydrofuran, 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 increased rapidly with the development of downstream industries such as PBT resin and spandex, and 1,4-butanediol has been in short supply in China. The most important use of tetrahydrofuran (THF) is the monomer used to produce polytetrahydrofuran (PTMEG), the raw material of spandex. At present, the supply of PTMEG is in short supply. Butanol is also an important organic chemical product, mainly used to manufacture n-butyl ester plasticizers of phthalic acid, aliphatic dibasic acid and phosphoric acid. They are widely used in various plastic and rubber produ...

Claims

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Application Information

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IPC IPC(8): C07C31/12C07C31/20C07C29/149C07D307/08C07D307/33
CPCY02P20/10
Inventor 陈泱李真泽张艺张翼陈迎贾微贾震许慎艳
Owner CHINA PETROLEUM & CHEM CORP
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