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Purification method and purification system of vicinal diol compound

A purification method and the technology of vicinal diols, which are applied in the field of purification methods and purification systems of vicinal diol compounds, can solve the problems of cumbersome refining process and inability to continue production, achieve no pungent smell, solve long-term dependence on imports, and improve The effect of product quality

Active Publication Date: 2020-01-24
DONGYING HI TECH SPRING CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the refining process of this method is cumbersome and cannot be continuously produced

Method used

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  • Purification method and purification system of vicinal diol compound

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1.1 Extractive distillation: 1,2-hexanediol from the olefin oxidation method enters from the upper packing layer of the extractive distillation tower through the feed pump, and the material amount of 1,2-hexanediol is controlled at about 800kg / h. The extractant enters from the lower part of the extractive distillation tower, and the addition amount of the control extractant is 200kg / h, and the extractant adopts methyl isobutyl ketone. The reaction temperature of the extractive distillation tower is controlled at about 130°C, the top pressure of the tower is 0.05MPa, the reflux ratio is 2, and the extraction residence time is controlled at 1h. The extractant at the top of the tower goes to the extractant regeneration device for recycling, and the material in the tower bottom goes to the subsequent step 1.2 for reactive distillation.

[0044] 1.2 Reactive distillation:

[0045] The rectification section of the reactive distillation tower is 5.0m mesh structured packing, ...

Embodiment 2

[0051] 2.1 Extractive distillation: 1,2-hexanediol from the olefin oxidation method enters from the upper packing layer of the extractive distillation tower through the feed pump, and the material amount of 1,2-hexanediol is controlled at about 800kg / h. The extractant enters from the lower part of the extractive distillation tower, and the addition amount of the control extractant is 200kg / h, and the extractant adopts methyl isobutyl ketone. The reaction temperature of the extractive distillation tower is controlled at about 130°C, the top pressure of the tower is 0.05MPa, the reflux ratio is 2, and the extraction residence time is controlled at 1h. The extractant at the top of the tower goes to the extractant regeneration device for recycling, and the material in the tower bottom goes to the subsequent step 2.2 for reactive distillation.

[0052] 2.2 Reactive distillation:

[0053] The rectification section of the reactive distillation tower is 5.0m mesh structured packing, ...

Embodiment 3

[0059] 3.1 Extractive distillation: 1,2-pentanediol from the olefin oxidation method enters from the upper packing layer of the extractive distillation tower through the feed pump, and the material amount of 1,2-pentanediol is controlled at about 600kg / h. The extraction agent enters from the lower part of the extractive distillation tower, and the addition amount of the control extraction agent is 100kg / h, and the extraction agent adopts petroleum ether. Control the reaction temperature of the extractive distillation tower at about 120°C, the top pressure of the tower at 0.05MPa, the reflux ratio of 2, and the extraction residence time at 1h. The extractant at the top of the tower goes to the extractant regeneration unit for recycling, and the material in the tower bottom goes to the subsequent step 3.2 for reactive distillation.

[0060] 3.2 Reactive distillation:

[0061] The rectification section of the reactive distillation tower is 5.0m mesh structured packing, the react...

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Abstract

The invention provides a purification method of a vicinal diol compound. The purification method comprises the steps that (S1) after a vicinal diol crude product is subjected to extractive distillation, the vicinal diol after extractive distillation is obtained; and (S2) the vicinal diol after extractive distillation is mixed with an odor remover for reactive distillation, wherein the odor removeris an amino-contained compound. Compared with the prior art, the method combines extractive distillation and reactive distillation, a large quantity of odorous impurities in the crude product are removed through extractive distillation, then trace odorous impurities are removed through reactive distillation by adding the chemical odor remover, therefore, the purity of an obtained product is greater than 99.9%, the product is clear, transparent and free of an irritating odor, the yield can reach 85%, the quality of the product is improved, the obtained vicinal diol compound can meet a cosmetic-grade requirement, the added value of the product is greatly increased, and the situation that high-end raw materials depend on import for a long term is solved.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis, and in particular relates to a purification method and a purification system of vicinal diol compounds. Background technique [0002] O-diol compounds such as 1,2-pentanediol, 1,2-hexanediol, 1,2-octanediol, etc. are an important class of fine chemicals, used in cosmetics, medicine, pesticides, surfactants, There are important uses in polyester, ink and other fields. In particular, vicinal diol compounds are non-corrosive and can dissolve a variety of active ingredients. They are widely used in various cosmetics such as skin creams, eye creams, skin care water, baby care products, sunscreen products, etc., and have both moisturizing and antiseptic effects. [0003] At present, there are two main synthetic routes of vicinal diol compounds in China: one is the direct oxidation method using olefins as raw materials. Although this method is simple in steps, the required catalysts are expen...

Claims

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Application Information

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IPC IPC(8): C07C29/84C07C29/80C07C31/20
CPCC07C29/84C07C29/80C07C31/20Y02P20/10
Inventor 滕文彬王春梅刘博闻杜桂强郝小军宋世晶
Owner DONGYING HI TECH SPRING CHEM IND
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