Method for producing epoxy chloropropane by dichloropropanol

A technology of epichlorohydrin and dichloropropanol, applied in the direction of organic chemistry, etc., to achieve the effect of reducing equipment size, saving energy, and low steam consumption

Inactive Publication Date: 2012-09-19
西安汉术化学工程股份有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, this method described above produces a large amount of aqueous effluent contaminated with organic matter, necessitating extensive wastewater treatment

Method used

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  • Method for producing epoxy chloropropane by dichloropropanol
  • Method for producing epoxy chloropropane by dichloropropanol
  • Method for producing epoxy chloropropane by dichloropropanol

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Embodiment Construction

[0017] The dichloropropanol from chlorination is transported from the storage tank (TK-100) to the mixer (MX-100) through the pump (P-100), and at the same time, the sodium hydroxide preparation device in the device prepares about 20% of the After the sodium hydroxide solution is pressurized and preheated, it is finally sent to the mixer (MX-100) by the pump (P-103) to mix with dichloropropanol and then enters the reactor (R-100) for the first step of saponification reaction , the tempering water is produced by exchanging heat between the heat exchanger (E-100) and the waste water from the bottom of the saponification tower (T-100) and raising the temperature. After the first part of the reaction, it enters the mixer (MX-101) and then mixes with NaOH, then enters the stripping tower (T-100) for the second step of reaction, while performing distillation and separation, DCH (dichloropropanol) continues in the tower The reaction occurs, and the crude epichlorohydrin and water fro...

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Abstract

The invention provides a method for producing epoxy chloropropane by dichloropropanol, which comprises the following steps of: carrying out saponification reaction on mixture of 1, 3-dichloro-2-propanol and 2, 3-dichloro-1-propanol and sodium hydroxide under alkaline condition, wherein the operation pressure is complete vacuum, to generate epoxy chloropropane and sodium chloride, wherein the dichloropropanol is obtained by reaction between glycerol and chlorine hydride-containing chlorinating agent, the reaction rate of the 1, 3-dichloro-2-propanol is relatively quicker than that of the 2, 3-dichloro-1-propanol, and the weight of the 1, 3-dichloro-2-propanol is more than 95% of the weight of the whole dichloropropanol, and adding the sodium hydroxide into the saponification reaction by three times, wherein the concentration of the sodium hydroxide needs controlling at 20%, and the device needs internally providing with a preparation device of sodium hydroxide solution. The method is high in chloropropane yield, less in the volume of aqueous effluent to be treated, energy sources-saving, and more environment-friendly.

Description

technical field [0001] The invention relates to a method for producing epichlorohydrin by reacting 1,3-dichloro-2-propanol with an alkaline reagent. Background technique [0002] Epichlorohydrin is a reaction intermediate for the manufacture of epoxy resins, synthetic elastomers, glycidyl ethers, polyamide resins, etc. [0003] In the manufacture of epichlorohydrin from dichloropropanol with alkaline reagents, the dehydrochlorination of dichlorohydrin accompanied by saponification of some of the epichlorohydrin formed mainly leads to the formation of glycerol and thus reduces Production of epichlorohydrin. To overcome this disadvantage, the reaction medium is stripped (optionally steam) to remove the epichlorohydrin as it is formed. However, such a method as described above produces a large amount of aqueous effluent contaminated with organic substances, necessitating extensive waste water treatment work. Contents of the invention [0004] The purpose of the present inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/08C07D301/26
Inventor 邵金保刘艳何世强马超平王志琰董颖涛张毅
Owner 西安汉术化学工程股份有限公司
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