Method for separating oil-phase dichloropropanol from mixed aqueous solution of dichloropropanol and chlorine hydride

Abstract

The invention discloses a method for separating oil-phase dichloropropanol from a mixed aqueous solution of dichloropropanol and chlorine hydride, which comprises the following steps of: mixing a metal halide with the mixed aqueous solution of dichloropropanol and chlorine hydride to obtain a metal halide-contained mixed solution; and carrying out mechanical agitation for 0.5-10 hours under the condition of heating or evaporation or rectification on the metal halide-contained mixed solution, so as to separate the oil-phase dichloropropanol from the mixed solution. According to the method disclosed by the invention, the principle of salt effect is utilized, the azeotropic point of the existing mixed aqueous solution of dichloropropanol and chlorine hydride is broken through adding the metal halide, so that the separation of the mixed aqueous solution of dichloropropanol and chlorine hydride is realized; and further, the metal halide is recycled, and thus, the handling capacity of three wastes is not increased. The investment on the whole device is little, the occupation of land is little, and the operation for separating dichloropropanol is simple.

Description

technical field [0001] The invention belongs to the field of production of epichlorohydrin and dichloropropanol, in particular to a method for separating dichloropropanol oil phase from dichloropropanol hydrogen chloride mixed aqueous solution. Background technique [0002] Epichlorohydrin (alias epichlorohydrin), the chemical name is 1-chloro-2,3-epoxypropane, and the molecular formula is C 3 h 5 OCl, with a boiling point of 115.2°C and a freezing point of -57.2°C, is a volatile and unstable colorless liquid, slightly soluble in water and miscible with various organic solvents. [0003] Epichlorohydrin is an important organic chemical raw material and fine chemical product. It is a large variety of propylene derivatives. It is mainly used in the synthesis of glycerin, epoxy resin, epichlorohydrin rubber, nitroglycerin explosives, etc. It can also be used It is used as a solvent for cellulose esters, resins and cellulose ethers; it is also the main raw material for the pro...

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Problems solved by technology

[0013] The extraction method requires additional solvents, and more equipment is invested. It is necessary to increase equipment such as multi-stage extraction towers, and the extraction process needs to be equipped with a series of equipment such as extractant distillation and separation towers, which increases equipment investment; Contaminated liquids such as chlorinated alkanes, esters, ethers, etc. are easy to leak during the production process, resulting in residual pollution in saponification wastewater or low boiling substances, which increases the cost of production

[0014] Although the separation of dichloropropanol pseudo-azeotrope by decantation is simple to operate, it is difficult to realize the operation due to the different composition of dichloropropanol, water and hydrogen chloride mixture after the reaction, which may easily lead to difficulties in decantation.

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