Method for removing acid from chlorobenzene washing wastewater

Abstract

The invention discloses a method for removing acid from chlorobenzene washing wastewater, relates to the related field of acid removing methods, and aims to solve the problem that ferric trichloride and hydrochloric acid cannot be separated from many kinds of washing wastewater by the acid removing method for reuse in the prior art. The method comprises the following steps of: S1, introducing washing wastewater into a sand filter; S2, adding excessive iron powder into the washing wastewater, and reacting the iron powder with ferric trichloride and hydrochloric acid in the washing wastewater; S3, continuing to stir the solution to enable hydrogen to overflow; S4, introducing the reaction solution in S3 into a filter tank for filtering, and filtering out residual iron powder in the excessiveiron powder; S5, introducing excessive chlorine into the filtered solution, and reacting the chlorine with a ferrous chloride solution; S6, continuing to stir the solution to enable chlorine residuesto overflow; S7, introducing the solution obtained in S6 into a resin filter material layer; and S8, when the concentration of hydrochloric acid in the resin filter material layer is saturated, pumping out the pure water by using a back-washing pump to dissolve the acid in the resin filter material layer in the pure water, and recovering to obtain a hydrochloric acid solution.

Description

technical field [0001] The invention relates to the field of acid removal methods, in particular to a method for acid removal in chlorinated benzene washing wastewater. Background technique [0002] Chlorinated benzene is a colorless, transparent, volatile liquid with a bitter almond smell. Melting point -45.6°C, boiling point 131.6°C, relative density 1.107 (20 / 4°C), refractive index 1.5248, flash point 23°C, autoignition point 637.78°C, flammable. The explosion limit in air is 1.83-9.23% (volume). Insoluble in water, easily soluble in alcohol, ether, benzene and chloroform, etc. Toxic, moderately toxic. The maximum allowable concentration in the workplace is 75×10-6; chlorinated benzene is an important basic organic synthesis raw material, used as dyes, medicines, pesticides, and organic synthesis intermediates. It is used in the manufacture of phenol, nitrochlorobenzene, dinitrochlorobenzene, aniline, nitrophenol and the pesticide DDT, etc. It is also used as a solven...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for removing acid in chlorinated benzene washing wastewater, so as to solve the problem that ferric chloride and hydrochloric acid cannot be separated and reused in many washing wastewater proposed in the above-mentioned background technology

Images