Crude glycerin treatment and applications of the same in epichlorohydrin production

A technology of epichlorohydrin and crude glycerin, which is applied in the preparation of organic compounds, separation/purification of hydroxyl compounds, preparation of hydroxyl compounds, etc., can solve the problems of large amount of organic solvent, unsuitable industrial application, high energy consumption, etc. , to achieve the effect of low processing energy consumption, simple and easy processing operation, and industrialization.

Active Publication Date: 2015-05-06
YIHAI TIANCHENG LIANYUNGANG CHEM INDSCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the disadvantages of large amount of organic solvent and high energy consumption, and is not suitable for industrial application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] Crude Glycerin Treatment

[0109] The raw material crude glycerol consists of the following composition: 80.6% glycerin, 14.3% water, 3.6% sodium chloride, and the balance is impurities; wherein, based on the total amount of crude glycerin, the ash content is 4.1%.

[0110] Add 600 g of the above-mentioned crude glycerol (A) into a 1000 mL four-necked flask, and at room temperature, pass 128 g of hydrogen chloride gas into the system, and fine particles of solid salts gradually precipitate out in the system; To the filter cloth aperture is the 800 purpose filter press to filter and remove the precipitated metal salt, to obtain glycerol (C1) 706g (68.5% glycerin, 18.1% hydrogen chloride, 12.2% water, 0.06% sodium chloride, and the impurity of surplus Wherein, based on the total amount of glycerol after treatment, the ash content is 0.23%).

[0111] Preparation of epichlorohydrin

[0112] Transfer the glycerin (C1) after the above treatment to another 2000mL four-necked...

Embodiment 2

[0115] Crude Glycerin Treatment

[0116] The composition of raw material crude glycerin is with embodiment 1.

[0117] Add 600 g of the above-mentioned crude glycerol (A) into a 1000 mL four-necked flask, carry out vacuum distillation to remove moisture at a gauge pressure of -98.2 KPa, and a temperature of 75° C. to obtain 560 g of crude glycerin (B) after dehydration (86.3% glycerol , 8.2% water, 3.9% sodium chloride, and the balance is impurities; wherein, based on the total amount of crude glycerin after water removal, the ash content is 4.2%); in the crude glycerin (B) after water removal, 114g of hydrogen chloride gas is passed into , the system gradually has fine particles of solid salts precipitated; at 60 ° C, the glycerin that has passed through the hydrogen chloride gas is transferred to a filter cloth with a pore size of 800 meshes for filtration to remove the precipitated metal salts, and the treated glycerin (C2) 653g (74.0% glycerol, 17.5% hydrogen chloride, 7....

Embodiment 3

[0123] Crude Glycerin Treatment

[0124] The composition, feeding amount and processing method of the raw material crude glycerin are the same as in Example 2.

[0125] The difference is that the obtained crude glycerin (B) 538g (89.8% glycerin, 4.5% water, 4% sodium chloride, the remainder is impurities after dehydration; wherein, based on the total amount of crude glycerin after dehydration, the ash content 4.3%), 106g of hydrogen chloride gas was introduced during desalination, and 624g of treated glycerin (C2) was obtained (77.5% glycerol, 17.1% hydrogen chloride, 3.9% water, 0.07% sodium chloride, and the balance was impurities; among them, based on the treatment After total glycerin, the ash content is 0.3%).

[0126] Preparation of epichlorohydrin

[0127] The preparation method of epichlorohydrin is with embodiment 1.

[0128] After chlorination, 943 g of dichloropropanol mixture was obtained, in which the content of dichloropropanol was 63.4%, and the yield was 88....

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Abstract

The present invention relates to a crude glycerin treatment and applications of the same in epichlorohydrin production. The present invention relates to a crude glycerin treatment method, which comprises: (a) adding hydrogen chloride gas to crude glycerin to precipitate insoluble solids; and (b) filtering to remove the precipitated solids to obtain the treated glycerin.

Description

technical field [0001] The invention relates to a processing method of crude glycerin and a method for producing epichlorohydrin by utilizing the processed glycerin. Background technique [0002] Epichlorohydrin is an important raw material for the production of epoxy resins, epichlorohydrin rubber, stabilizers, surfactants, flame retardants and oilfield chemicals, and dichlorohydrin is a key intermediate for its synthesis. At present, the industrial production methods of dichloropropanol are mainly propylene high-temperature chlorination method and propylene acetate method using propylene as raw material. The high-temperature chlorination of propylene has problems such as high energy consumption, low utilization rate of propylene, many by-products, and excessive discharge of chlorine-containing wastewater; the propylene acetate method has problems such as long process route, large investment, expensive catalyst and short life. In general, the above two industrial methods c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/22C07C29/74C07D303/08C07D301/26
CPCC07C29/74C07C29/94C07D301/26C07D303/08C07C31/225
Inventor 李保国韩福彬王亮卢劲松
Owner YIHAI TIANCHENG LIANYUNGANG CHEM INDSCO
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