Method for processing dimethylamine waste water by ion-exchange method

Abstract

A method for treating dimethylamine wastewater by using the ion exchange technique comprises the following steps: performing ion exchange to wastewater, from which suspended substances have been removed by filtration, and strong acid cations at the temperature of 10-90 DEG C; absorbing dimethylamine to saturation by resin, and then eluting dimethylamine by using an inorganic acid solution at the concentration of 0.1-8M to regenerate resin. The method can ensure that the removal rate of dimethylamine from wastewater is equal to or higher than 96%, so as to cause wastewater to be emitted according to the emission standard or to be recycled; and the eluted dimethylamine forms high-concentration dimethylamine salt, which can be recycled. The method has the advantages of simple process, convenient operation, low treatment cost, and no secondary pollution, thus realizing harmless green treatment of dimethylamine wastewater.

Description

1. Technical field [0001] The invention relates to a method for treating industrial waste water, in particular to a method for treating waste water generated in the artificial leather industry, specifically a method for treating dimethylamine waste water by ion exchange. 2. Background technology [0002] Dimethylamine is a gas at room temperature with an ammonia-like odor. Soluble in water, soluble in ethanol and ether. It is flammable, weakly alkaline, and forms water-soluble salts with inorganic acids. Dimethylamine is highly irritating, and when the content in the wastewater is low, there will be an unpleasant fishy smell, and if the concentration is high, it will have a strong irritating effect on the eyes and respiratory tract. [0003] Dimethylamine (DMA) is one of the most widely used and most demanded methylamine substances. It is widely used in various industrial fields such as pesticides, medicines, organic synthesis, rubber, and leather, as well as in the produc...

AI Technical Summary

Problems solved by technology

The stripping method only desorbs part of the dimethylamine in water and transfers it to the air, and fails to realize the real treatment of dimethylamine; the rectification method requires large equipment investment and high energy consumption

There are also literatures that propose the use of hydrogen peroxide oxidation to treat dimethylamine wastewater, but it has not been practically applied due to high operating costs.

For example, Lu Weiqi proposed the method of blowing off the dimethylamine in the water with air first, and then absorbing the dimethylamine in the air through sulfuric acid, but this method also has the problem of high operating costs.