Method for preparing calcium chloride from saponification residues obtained by preparing epoxypropane or epoxy chloropropane through chlorohydrin method and device for realizing method

Abstract

The invention relates to a method for preparing calcium chloride from saponification residues obtained by preparing epoxypropane or epoxy chloropropane through a chlorohydrin method and a device for realizing the method. The method comprises the following steps of 1, reacting the saponification residues obtained by preparing epoxypropane or epoxy chloropropane through the chlorohydrin method with a substance containing hydrochloric acid in a reactor, and after finishing, entering a sedimentation tank, 2, pumping the mixed liquid with the solid impurities settled into a solid-liquid separation device for solid-liquid separation, taking residues for brick making, and enabling clear liquid to enter a purifier, or reducing the COD of the clear liquid to 5000 mg / l or below after adsorbing by adopting macroporous resin, and then entering the purifier, 3, adding a purifying agent into the purifier, reacting for 0.2-10 hours, and enabling purified liquid to enter a buffer pool, and 4, pumping the purified liquid into a concentrator from the buffer pool, concentrating, and drying to obtain the product. By adopting the method disclosed by the invention, the stacking problem of saponification residues obtained by preparing epoxypropane or epoxy chloropropane by using a chlorohydrin method and the treatment problem of a byproduct hydrochloric acid in chloroalkene production are solved.

Description

technical field [0001] The invention relates to a method for preparing calcium chloride from a saponification residue obtained by preparing propylene oxide or epichlorohydrin by a chlorohydrin method and a device for realizing the method, belonging to the field of industrial environmental protection. Background technique [0002] Propylene oxide or epichlorohydrin is an important organic chemical raw material. It is the third largest propylene derivative after polypropylene and acrylonitrile among propylene derivatives. It is widely used in the production of polyether, propylene glycol, and surfactants. Wait. With the development of polyurethane synthetic materials, unsaturated polyester resins, advanced synthetic detergents and other products, the demand for propylene oxide is increasing year by year. Epichlorohydrin is also an important organic chemical raw material and fine chemical product. Epoxy resins made from epichlorohydrin are widely used in the fields of glass fi...

AI Technical Summary

Problems solved by technology

A large amount of hydrochloric acid is by-produced in the production process of the above-mentioned chlorinated olefins at the same time. These by-product hydrochloric acids contain a small amount of organic matter, the sales price is low, and it is difficult to handle

[0005] CN201120200056.3 provides a device for making bricks using saponification residues. The production process is simple and the amount of residues is large. The bricks made can replace clay bricks, which saves land resources. No waste is generated during the production process, and there is no environmental pollution. The saponification residue produced in the production process of propylene oxide is effectively used, which solves the problems of land occupation and secondary pollution; however, this method has a greater impact in the off-season of construction and consumes less saponification residue

[0006] CN200610026596.8 provides a method for processing the waste produced by the chlorohydrin method to prepare propylene oxide for building materials, adding calcium hydroxide or cement to the saponification residue to make lime paste or building materials; this method does not handle saponification Chloride ions in the residue will corrode metal materials such as steel bars, and the use will be limited

[0007] CN201310616878.3 provides a method for preparing methanesulfonic acid from hydrochloric acid produced in the production of chlorinated olefins, using the reaction path of hydrogen chloride → chlorine → methanesulfonic acid → hydrogen chloride; although this method can recycle chlorine, but Consumption of by-product hydrochloric acid is less, and because the price of chlorine gas is low, it is uneconomical to produce chlorine gas from by-product hydrochloric acid

[0008] CN201610294878.X provides a salt mud resource utilization method, using hydrochloric acid by-product in the production of chlorinated olefins to react with salt mud to prepare calcium sulfate dihydrate, magnesium hydroxide and calcium chloride dihydrate, which is in line with the green environmental protection policy; During the treatment process of this method, the macroporous adsorption resin and activated carbon cannot completely adsorb organic matter, and cannot be applied to residues containing organic matter.

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