Technological method for purifying1,4-butanediol and co-producing gamma-butyrolactone

A technology of butanediol and butyrolactone, which is applied in the field of 1,4-butanediol purification and co-production of γ-butyrolactone, can solve the problems of complex reactor structure and increasing difficulty, and achieve high selectivity, The effect of reducing losses

Active Publication Date: 2013-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the method proposed by the patent CN1216973, a very large amount of stream is passed through a solid catalyst in the form of gas and liquid, but only 0.1%~0.4% of the material is converted, and the water is in a liquid state d

Method used

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  • Technological method for purifying1,4-butanediol and co-producing gamma-butyrolactone

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Effect test

Embodiment 1

[0032] The composition of crude 1,4-butanediol was: 0.36% of 2-(4-hydroxybutoxy)tetrahydrofuran, 0.75% of γ-butyrolactone, and 98.89% of 1,4-butanediol. The crude 1,4-butanediol stream enters the rectification tower A through pipeline 1. The rectification tower adopts a conventional packed tower and is operated under reduced pressure. Under this condition, the stream entering rectification tower A is separated, and the side line obtains 1,4-butanediol with a purity of 99.83% and enters the product tank area through pipeline 3. The overhead stream consists of: 2-(4-hydroxybutoxy ) tetrahydrofuran content 0.56%, γ-butyrolactone content 0.99%, 4-hydroxybutyric acid-4'-hydroxybutyl ester content 0.12%, 1,4-butanediol content 98.33%. Bottom stream composition: 2-(4-hydroxybutoxy)tetrahydrofuran content 0.02%, γ-butyrolactone content 0.01%, 4-hydroxybutyric acid-4'-hydroxybutyl ester content 0.24%, 1,4-butyric acid Glycol content 99.73%; part of the tower bottom stream is returned ...

Embodiment 2

[0034] The crude 1,4-butanediol stream containing 0.5% 2-(4-hydroxybutoxy)tetrahydrofuran enters the rectification tower A through pipeline 1, and the rectification tower adopts a conventional packed tower, operated under reduced pressure, and controlling the top pressure 3.0kPa, reflux ratio 15.0, the stream entering rectifying tower A is separated, and the 1,4-butanediol with a purity of 99.83% is obtained from the side line and enters the product tank area through line 3, and the bottom flow is all through line 5 and from line 2 The 1,4-butanediol stream containing 0.94% 2-(4-hydroxybutoxy)tetrahydrofuran at the top of the tower is mixed and then enters the vaporizer B. In the vaporization chamber B, it is contacted with the hot hydrogen coming from the pipeline 7 and is completely vaporized. , control the hydrogen / butanediol molar ratio of 3.5, enter the dehydrogenation reactor C through the pipeline 6, and carry out the dehydrogenation reaction under the conditions of cont...

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Abstract

The invention discloses a technological method for purifying 1,4-butanediol and co-producing gamma-butyrolactone. The technological method comprises the following steps: a raw 1,4-butanediol material flow containing 2-(4-hydroxyl butoxy) tetrahydrofuran enters a 1,4-butanediol product refining tower, a 1,4-butanediol product with the purity being higher than 99.8% is produced at the side line of the refining tower, and material flows rich in 1,4-butanediol at the top and bottom of the refining tower are mixed and then enter a vaporizer for vaporization; and the vaporized material flow enters a dehydrogenation reactor and is dehydrogenated under the action of a dehydrogenation catalyst to generate gamma-butyrolactone; after reaction, the material flow enters a gas-liquid separator, a gas phase flow is reused, and a liquid phase enters a distillation tower; light components at the top of a distillation tower are recovered, and a raw gamma-butyrolactone material flow at the bottom of the distillation tower enters the refining tower; and a gamma-butyrolactone product with the purity being higher than 99.7% is produced at the side line of the refining tower, the material flow at the tower top returns to the gas-liquid separator, and the material flow at the tower bottom returns to the dehydrogenation reactor. According to the technological method, the gamma-butyrolactone with the high selectivity is produced while the 1,4-butanediol product the high purity is separated out, the seperation problem of the 2-(4'-hydroxyl butoxy) tetrahydrofuran in the 1,4-butanediol product flow is solved, and the production cost is greatly reduced; and the technological method is suitable for industrial application.

Description

technical field [0001] The invention relates to a process for purifying 1,4-butanediol and co-producing γ-butyrolactone, in particular to a process for refining crude 1,4-butanediol and co-producing γ-butyrolactone process method. Background technique [0002] 1,4-Butanediol is an important basic organic chemical raw material, mainly used in the production of tetrahydrofuran, polybutylene terephthalate (PBT), γ-butyrolactone and polyurethane (PU). In recent years, due to the rapid growth in demand for thermoplastic elastic fibers and elastomers, the demand for PTMEG (polytetramethylene ether glycol) and PTMG (polytetrahydrofuran ether) as monomers has been strong, making the upstream raw material 1,4-butanedi The demand for alcohol is also growing rapidly, and major 1,4-butanediol producers in the world, such as BASF and DUPON, have expanded their production capacity. γ-butyrolactone is an important organic chemical raw material and fine chemical intermediate. It is also a...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/76C07D307/33
Inventor 陈明苏杰乔凯翟庆铜张宝国张淑梅周峰
Owner CHINA PETROLEUM & CHEM CORP
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