Method for producing 1,6-hexandiol

A technology of hexanediol and adipic acid, applied in the field of production 1, can solve problems such as regeneration of exchangers

Active Publication Date: 2010-05-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The raw material used in this patent is a mixture, emphasizing the pretreatment process, and there are problems such as the regeneration of the exchanger

Method used

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  • Method for producing 1,6-hexandiol
  • Method for producing 1,6-hexandiol

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The process flow equipment of the present invention is described in detail according to the accompanying drawings. Process flow diagram as Figure 1 Show. The process operation is described as follows: first add a solid acid catalyst to the batch pre-esterification kettle 1, add the solid raw material adipic acid into the batch pre-esterification kettle 1 from the feeding port, and use a methanol pump to feed methanol from the middle of the raw material methanol The storage tank is added to the pre-esterification kettle to carry out the pre-esterification reaction. In normal operation, the solid acid catalyst is stored in the kettle for repeated use. The pre-esterification tank is heated, and the methanol vapor is condensed and then refluxed into the pre-esterification tank during the reaction. After the pre-esterification reaction is completed, the supernatant liquid of the reaction product is sent to the raw material storage tank 2 after sampling and analysis. The...

Embodiment 2

[0031] Add solid acid catalyst, adipic acid and methanol in the esterification kettle, heat and stir at normal pressure, and carry out pre-esterification reaction. The amount of catalyst added is based on the quality of adipic acid. The specific results are as follows:

[0032] Table 1 The results of pre-esterification experiments with different catalyst additions

[0033] Catalyst addition

Embodiment 3

[0035] Utilize the product of embodiment 2 to carry out continuous esterification, normal pressure, under the condition of 70~150 ℃, concrete result is as follows:

[0036] Table 2 Results of continuous esterification experiments with different reactor length-to-diameter ratios

[0037] Reactor aspect ratio

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Abstract

The invention relates to a method of producing 1, 6-hexanediol, which is that solid acid catalysts that are adipate and methanol are pre-esterified at atmospheric pressure; the supernatant fluid of reaction products after pre-esterifying is delivered to a continuous esterifying tower to act the continuous esterifying reaction with methanol vapor under the action of a catalyst, and the temperaturefor the continuous esterifying reaction ranges from 70 DEG C to 15 DEG C; based on the quality of the adipate, the addition amount of a solid catalyst ranges from 1 to 10 percent; the molar ratio of the methanol and the adipate is 1 to 10:1, and a solid acid catalyst is strong acidic ion exchange resin; reactants act the hydrogenation reaction after purification by rectification, wherein, the molar ratio of the hydrogen and ester is 50 to 350:1, the temperature ranges from 150 to 250 DEG C, the pressure ranges from 2.5 to 10.0MPa, and the catalysts are copper oxide ranging from 25 to 60 percent, zinc oxide ranging from 25 to 60 percent and alumina ranging from 10 to 30 percent; the obtained crude methanol is performed through the purification by rectification to gain the 1, 6-hexanediol the purity quotient of which is 99.0 percent, and the waste methanol can be recycled after the rectification.

Description

Technical field: [0001] The present invention relates to a method for producing 1,6-hexanediol. Background technique: [0002] 1,6-Hexanediol is a solid at room temperature, with a melting point of 42°C, a molecular weight of 118.18, and a density of 0.965g / cm 3 . 1,6-hexanediol is mainly used as a raw material for new polyesters, coatings, adhesives, sealants and plasticizers. Polyester polyol prepared with 1,6-hexanediol is used to modify polyurethane elastomer. The modified resin has excellent mechanical strength, heat resistance, water resistance and oxidation resistance. The polyurethane elastomer can be widely used in synthetic rubber, synthetic fiber, synthetic leather and other fields. At the same time, 1,6-hexanediol has a longer carbon chain and relatively greater flexibility, and can be used to prepare new polyester products with special properties. On the other hand, with the continuous improvement of living standards, people's requirements for environmental ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/149C07C31/20
Inventor 程光剑石鸣彦史君李凤鸣张元礼黄集钺李民刘玉强胡亚文贺俊海
Owner PETROCHINA CO LTD
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