Preparation method for aliphatic mixed dihydric alcohol

A technology of mixing dibasic acids and aliphatics, which is applied in the field of preparation of aliphatic mixed dibasic alcohols, can solve the problems of complex production process, high production cost, and low yield of finished products, and achieve simple production process, low production cost, The effect of stabilizing finished product components

Inactive Publication Date: 2015-12-16
ZHEJIANG BOJU NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation method of aliphatic mixed diols, which solves the problems of complex production process, high production cost, large pollution and low yield of aliphatic mixed diols in the traditional technology

Method used

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  • Preparation method for aliphatic mixed dihydric alcohol
  • Preparation method for aliphatic mixed dihydric alcohol
  • Preparation method for aliphatic mixed dihydric alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of the aliphatic mixed dibasic alcohol in this embodiment includes the preparation stage of the aliphatic mixed dibasic acid glycol wax ester and the preparation stage of the aliphatic mixed dibasic alcohol, and the specific steps are as follows:

[0027] 1) Preparation stage of aliphatic mixed dibasic acid diol wax ester

[0028] Mix and melt aliphatic mixed dibasic acid: aliphatic mixed dibasic alcohol at a molar ratio of 1:40 and store it in batching tank B, through which the material passes continuously through five esterification reaction kettles with a diameter of 1m and a height of 5m ;The temperature of the esterification reactor is kept at 150°C, the pressure is kept at 0.5MPa, and the reaction residence time is 10h; the water generated by the reaction and a small amount of aliphatic mixed diols and mixed dibasic esters are taken away by nitrogen; The bulging water and organic matter are separated by the flash tower D, and the distilled o...

Embodiment 2

[0032] The preparation method of the aliphatic mixed dibasic alcohol in this embodiment includes the preparation stage of the aliphatic mixed dibasic acid glycol wax ester and the preparation stage of the aliphatic mixed dibasic alcohol, and the specific steps are as follows:

[0033] 1) Preparation stage of aliphatic mixed dibasic acid diol wax ester

[0034] The aliphatic mixed dibasic acid and aliphatic mixed dibasic alcohol are mixed and melted at a molar ratio of 1:25, and stored in the batching tank B, and the materials in the batching tank B are continuously passed through five esterification reaction chambers with a diameter of 1m and a height of 5m Kettle; the temperature of the esterification reactor is kept at 200°C, the pressure is kept at 4MPa, and the reaction residence time is 22h; the water generated by the reaction and a small amount of aliphatic mixed diols and mixed dibasic esters are taken away by nitrogen; nitrogen The bulging water and organic matter are ...

Embodiment 3

[0038] The preparation method of the aliphatic mixed dibasic alcohol in this embodiment includes the preparation stage of the aliphatic mixed dibasic acid glycol wax ester and the preparation stage of the aliphatic mixed dibasic alcohol, and the specific steps are as follows:

[0039] 1) Preparation stage of aliphatic mixed dibasic acid diol wax ester

[0040] The aliphatic mixed dibasic acid and aliphatic mixed dibasic alcohol are mixed and melted at a molar ratio of 1:10, and then stored in the batching tank B. The materials in the batching tank B are continuously passed through five esterification reaction chambers with a diameter of 1m and a height of 5m. Kettle; the temperature of the esterification reactor is kept at 100°C, the pressure is kept at 2.5MPa, and the reaction residence time is 35h; the water generated by the reaction and a small amount of aliphatic mixed diols and mixed dibasic esters are taken away by nitrogen; The water and organic matter blown out by the ...

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Abstract

The invention discloses a preparation method for aliphatic mixed dihydric alcohol. The preparation method comprises a preparation stage of aliphatic mixed diacid dihydric alcohol wax ester and a preparation stage of aliphatic mixed dihydric alcohol. The method specifically comprises the following steps: 1) in the preparation stage of aliphatic mixed diacid dihydric alcohol wax ester, mixing aliphatic mixed diacid and aliphatic mixed dihydric alcohol, controlling the pressure at 0.5-4MPa, and carrying out continuous reaction for 10-40 hours to generate the aliphatic mixed diacid dihydric alcohol wax ester; and 2) in the preparation stage of aliphatic mixed dihydric alcohol, carrying out reductive reaction on the aliphatic mixed diacid dihydric alcohol wax ester and hydrogen under the action of a hydrogenation catalyst and an alloy catalyst to generate the aliphatic mixed dihydric alcohol, wherein the hydrogen pressure is maintained at 1.0-15.0MPa and the flow rate of hydrogen is 300-5000 cubic meter/hour. A finished product is stable in component and high in purity, and the yield reaches up to over 95%. According to different requirements of clients, high-purity single-component aliphatic dihydric alcohol can be prepared in a rectification manner, so that the additional value of the product is further improved.

Description

technical field [0001] The invention relates to a preparation method of aliphatic mixed dihydric alcohol. Background technique [0002] At present, aliphatic mixed diols are mainly based on petroleum-based and bio-based raw materials, through a unique green chemical synthesis process, to synthesize key products used in the fields of automobiles, high-speed rail, construction, aerospace, personal life and care products . In recent years, the development of polyols has been rapid. In 2001, the total global production capacity was 4.975 million tons, in 2004 it was 5.205 million tons, and in 2009 it was 6.93 million tons. The production capacity of polyether polyols is increasing at an average annual rate of about 3%, and the annual growth rate in the Asia-Pacific region is about 5%. Foreign polyether polyol production facilities are relatively large-scale, and production is relatively concentrated. The main manufacturers are large multinational companies such as Dow, Bayer, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/149C07C31/20
CPCC07C67/08C07C29/149C07C69/34C07C31/20
Inventor 龚华银周志军汪和宝周邦福
Owner ZHEJIANG BOJU NEW MATERIALS CO LTD
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