Method for extraction separation of dichloropropanol from dichloropropanol hydrochloric water solution

A technology of dichloropropanol hydrochloric acid and dichloropropanol, applied in chemical instruments and methods, separation/purification of hydroxyl compounds, preparation of organic compounds, etc., can solve the problem of purification of hydrochloric acid solution without dichloropropanol Process and other issues, to achieve the effect of reducing energy consumption and waste water discharge, simple and convenient operation, and increasing production capacity

Active Publication Date: 2008-03-05
JIANGSU YANGNONG CHEM GROUP
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  • Summary
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Problems solved by technology

[0014] So far, there is no process for the purificatio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Pump in dichloropropanol hydrochloric acid aqueous solution 1000g / h from bottom to top in the middle and lower part of the extraction tower; Mixing and separation inside the tower, the upper part of the extraction tower obtains the water phase, and the lower part of the extraction tower obtains the oil phase, which is continuously fed and withdrawn. The oil phase composition and water phase composition are shown in the attached table, and the total extraction yield is 97.35%. The dichloropropanol in the oil phase is distilled at atmospheric pressure, and the extracted dichloromethane is used for extraction, and the obtained dichloropropanol is desolvated and enters the saponification reaction to generate epichlorohydrin.

Embodiment 2

[0036] Operation is the same as in Example 1, the extraction agent uses chloroform, the feed rate of dichloropropanol hydrochloric acid aqueous solution is 1000g / h, and the feed rate of chloroform is 1000g / h, and the oil phase composition and the water phase composition are shown in the attached table. The extraction yield of chloropropanol is 95%.

Embodiment 3

[0038] The operation is the same as in Example 1, the extraction agent uses dichloroethane, the feed rate of dichloropropanol hydrochloric acid aqueous solution is 1000g / h, and the feed rate of dichloroethane is 1000g / h, and the oil phase composition and water phase composition are shown in the attached table , The extraction yield of dichloropropanol is 97%.

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PUM

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Abstract

The present invention relates to extraction process of separating dihcloro propanol from hydrochloric acid aqua of dihcloro propanol in the dihcloro propanol yield over 90 % and the dihcloro propanol content in the extracted water phase lower than 0.05 %. The extraction equipment has simple structure, great treating capacity and low power consumption, and the extraction process has environment friendship, high dihcloro propanol recovering rate and is suitable for continuous industrial production. The present invention also provides the way of extracting other organic matter from hydrochloric acid aqua.

Description

technical field [0001] The invention relates to a method for separating organic matter in the technical field of fine chemical products, in particular to a new method for separating dichloropropanol with high yield from dichloropropanol hydrochloric acid aqueous solution in the production of epichlorohydrin. Background technique [0002] Dichloropropanol refers to 1,3-dichloropropanol, 2,3-dichloropropanol and their mixtures, which are intermediates in the production of epichlorohydrin, whether it is chloropropene method, propylene acetate method or glycerol method The production of epichlorohydrin will produce a homogeneous system of dichloropropanol hydrochloric acid aqueous solution. Since hydrogen chloride azeotropes with water at a ratio of about 20% (wt), its azeotropic temperature is higher than the boiling point of water, and hydrogen chloride, water, and dichloropropanol will form a pseudo-ternary azeotropic system. It is difficult to recover dichloropropanol and h...

Claims

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Application Information

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IPC IPC(8): C07C31/36C07C29/86C07C29/76
Inventor 许玉梅薛守兆史雪芳丁克鸿顾志强许金来
Owner JIANGSU YANGNONG CHEM GROUP
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