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Process for producing 1,4-butanediol

A technology of butanediol and butanol, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of poor economy and high energy consumption, and achieve the effect of saving energy consumption and waste water generation

Active Publication Date: 2018-07-27
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of high energy consumption and poor economy in the prior art, and a new method for producing 1,4-butanediol is provided

Method used

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  • Process for producing 1,4-butanediol
  • Process for producing 1,4-butanediol
  • Process for producing 1,4-butanediol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] according to figure 1 In the process shown, the mixture flow 1 using n-butane, air and water vapor as raw materials enters the reaction unit R, and reacts to obtain the flow 2 containing maleic anhydride, water, nitrogen, acetic acid, acrylic acid and butane. Stream 2 is heat-exchanged to about 130°C by switching coolers. Enter the absorption tower A, and obtain an oil-rich stream 4 containing 12%-18% maleic anhydride through absorption and separation. Stream 4 enters the esterification unit E, reacts with butanol in the stream 8 and stream 14 entering the esterification unit, obtains dibutyl maleate from the bottom of the esterification tower, and the maleic acid at the bottom of the esterification tower The dibutyl ester stream 5 enters the absorption tower A; the esterification tower overhead stream 7 enters the light tower, and after rectification, the light component stream 71 and stream 75 are mixed into the chromatograph, and the heavy stream 77 enters the heavy...

Embodiment 2

[0054] According to the conditions and steps described in Example 1, the weight content of n-butane in feed stream 1 was 3.5%, the weight content of oxygen was 22.0%, and the temperature was 150°C. The operating conditions of n-butane oxidation reactor R are: operating temperature 400°C, operating pressure 2.18 bar.

[0055] The operating conditions of absorption tower A are as follows: the number of trays is 25, the operating temperature at the top of the tower is 80.0°C, the temperature at the bottom of the tower is 90.0°C, the pressure at the top of the tower is 1.4bar, the temperature of the cold cycle in the middle and lower section of the tower is 40.0°C, and the number of circulating feeding plates is 18 pieces, the ratio of the weight of the circulating stream to the weight of the stream 4 is 4.56.

[0056] The operating conditions of the monoesterification reactor are as follows: the operating temperature is 120° C., and the operating pressure is 9.0 bar. Double este...

Embodiment 3

[0072] According to the conditions and steps described in Example 1, the weight content of n-butane in feed stream 1 was 3.5%, the weight content of oxygen was 22.0%, and the temperature was 150°C. The operating conditions of n-butane oxidation reactor R are: operating temperature 400°C, operating pressure 2.18 bar.

[0073] The operating conditions of absorption tower A are as follows: the number of trays is 25, the operating temperature at the top of the tower is 85.0°C, the temperature at the bottom of the tower is 97.4°C, the pressure at the top of the tower is 1.7bar, the temperature of the cold cycle in the middle and lower section of the tower is 52.0°C, and the number of circulating feeding plates is 18 pieces, the ratio of the weight of the circulating stream to the weight of the stream 4 is 4.56.

[0074] The operating conditions of the monoesterification reactor are as follows: the operating temperature is 120° C., and the operating pressure is 9.0 bar. Double este...

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Abstract

The invention relates to a method for producing 1, 4-butanediol. By the aid of the method, problems of high energy consumption and poor economical efficiency in the prior art mainly can be solved. According to the technical scheme, the method for producing the 1, 4-butanediol has the advantages that processes for producing maleic anhydride and processes for producing BDO (butanediol) are combined with one another, and accordingly original rich oil desorption and solvent treatment equipment and energy consumption of devices for producing maleic anhydride by the aid of n-butane processes can be omitted; impurities generated by a device for producing maleic anhydride and impurities generated by a device for producing BDO can be removed together, and the device cost can be saved; butanol is used as a maleic anhydride esterification raw material for generating dibutyl maleate (DBM), butanol byproducts generated in hydrogenation phases can be utilized, and accordingly the production cost of the 1-4-butanediol can be reduced; butanol separation procedures are improved and modified at butanol separation and purification steps, accordingly, the problems can be effectively solved by the aid of energy-saving effects, and the method can be used for producing the 1-4-butanediol.

Description

technical field [0001] The present invention relates to a method for producing 1,4-butanediol. Background technique [0002] 1,4-Butanediol is an important organic and fine chemical raw material, which is widely used in the fields of medicine, chemical industry, textile, papermaking, automobile and daily chemical industry. Its downstream derivative products include tetrahydrofuran (THF), polybutylene terephthalate (PBT), gamma-butyrolactone (GBL), coatings and plasticizers, etc. Among them, THF can be used to produce polytetramethylene butanediol (PTMEG), which is a raw material for synthesizing spandex, polyether elastomer and thermoplastic polyurethane. In addition, BDO can also be used as solvent, coating resin and pharmaceutical intermediate. [0003] The process routes for producing BDO mainly include: alkyne aldehyde method, butadiene method, propylene oxide method and n-butane / maleic anhydride method (including direct hydrogenation of maleic anhydride and esterifica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/149C07C29/80C07C31/20C07D307/60C07C67/08C07C69/60
CPCC07C29/149C07C29/80C07C67/08C07D307/60C07C31/207C07C69/60
Inventor 王墨刘肖肖陈迎李真泽
Owner SINOPEC SHANGHAI ENG
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