Improved epichlorohydrin production method based on chlorohydrination method

Abstract

The invention relates to an improved epichlorohydrin production method based on the chlorohydrination method. Water removed from calcium carbonate is adopted to react with chlorine, so that hydrogen chloride associated with the hypochlorous acid process is produced; hydrogen chloride does not exist in the process of chlorohydrination reaction, the concentration of dichloropropanol is high at the outlet of a chlorohydrination reactor, produced byproduct is little, and chloropropene raw material is converted into a lot of target product; no waste residue is produced in sodium hydroxide saponification, blockage does not occur in a saponification tower, and the system can operate for a long period; the residual water of saponification is little, the composition of the residual water of saponification is simple, and the residual water of saponification can be easily treated to protect the environment and treated into resource; and the corrosion of equipment in the process of hydrogen chloride-free chlorohydrination reaction and saponification reaction is minor. The concentration of dichloropropanol is high at the outlet of the chlorohydrination reactor, and the production capability islarge. The benefit brought by no byproduct is far higher than the production cost added by replacing calcium hydroxide with sodium hydroxide, and overall economic benefit and environmental benefit areremarkable.

Description

technical field [0001] The invention relates to a production method of chemical products, in particular to a production method of chlorohydrin method epichlorohydrin using chloropropene and chlorine gas as raw materials. Background technique [0002] Epichlorohydrin is an important chemical product and an important raw material in the production process of medicine, dyestuff, surfactant, epoxy resin, synthetic rubber, glycerin, etc. The production method of epichlorohydrin by chlorohydrin method using chloropropene and chlorine gas as raw materials is widely used in my country and the world. This method has a long production history and mature technology. However, the traditional production method of epichlorohydrin by chlorohydrin method has the disadvantage that the concentration of dichloropropanol at the outlet of the chlorohydrination reactor increases, and the by-products increase accordingly, resulting in high raw material consumption and energy consumption in the pr...

AI Technical Summary

Problems solved by technology

However, the traditional production method of epichlorohydrin by chlorohydrin method has the disadvantage that the concentration of dichloropropanol at the outlet of the chlorohydrination reactor increases, and the by-products increase accordingly, resulting in high raw material consumption and energy consumption in the production process, low device production capacity, and equipment severe corrosion

In particular, a large amount of waste water and waste residues generated in the production process are difficult to carry out environmental protection treatment and effective utilization, which has become a bottleneck restricting the production of epichlorohydrin

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