Treatment system and method for recovering methylamine/ethylamine from amine-containing wastewater

Abstract

The invention discloses a treatment system and method for recovering methylamine / ethylamine from amine-containing wastewater. The system comprises an amine gasification tower, a multi-stage condensation device, a multi-stage negative pressure absorption device and a tail gas absorption tower which are sequentially communicated. According to the method, filtered amination production wastewater flows into an amine gasification tower and is heated, and the heated wastewater is pumped to a liquid distribution unit and is atomized; the amine-containing steam in the mist-like liquid enters a multi-stage condensation device and is subjected to condensation treatment; the amine-containing gas in the amine-containing steam enters a multi-stage negative pressure absorption device; and water is sprayed into a tail gas absorption tower, the supplemented water is conveyed to the previous stage step by step, and collecting is completed until the solubility of the amine solution in the first-stage absorption tank of the multi-stage negative pressure absorption device is 10-20%. According to the invention, the treatment method is simple in technological process, easy to operate and control and capable of saving energy consumption; and through reasonable process connection and process parameter configuration, methylamine / ethylamine is fully recycled, the concentration is increased, seamless connection with other related production processes can be achieved, the purpose of cyclic and clean production is achieved, and economic benefits and social benefits are extremely remarkable.

Description

technical field [0001] The invention relates to the technical field of organic matter recovery, in particular to a treatment system and method for recovering methylamine / ethylamine from amine-containing wastewater. Background technique [0002] Methylamine / Ethylamine is an important chemical raw material, which is widely used in chemical industry, pesticide, medicine, rubber, leather and other organic chemical industries. It is easily soluble in water, and a large amount of amine-containing wastewater will be generated during its production and use. For example, in the production process of anion resins such as ion exchange resin 201*7 / D201 / D301, the resin white balls need to be aminated after chlorination. In the rubber accelerator industry, when PZ (zinc dimethyldithiocarbamate) adopts one-step or two-step method to produce raw material dimethylamine, when ZDC (zinc diethyldithiocarbamate) series produces raw material diethylamine Amination is also required. [0003] Ami...

AI Technical Summary

Problems solved by technology

Therefore, if the amination mother liquor is not recovered by methylamine / ethylamine, it will directly enter the wastewater treatment system or be discharged into the water body, which will cause environmental pollution, increase the difficulty of sewage treatment and waste resources, so effective treatment and recovery measures need to be taken

[0004] At present, most of the methylamine / ethylamine wastewater is treated by incineration in China, but the low-concentration methylamine / ethylamine aqueous solution itself cannot be burned, and a large amount of heat must be provided for its combustion; therefore, the combustion treatment method consumes a lot of energy and costs high; in addition, After the amination production wastewater is burned, harmful gases such as nitrogen dioxide, nitrogen monoxide, carbon dioxide, and carbon monoxide will be produced, which will cause secondary pollution to the air

[0005] In addition, other treatment methods such as steam stripping, chemical precipitation, complex extraction, ion exchange, and dimethylamine hydrochloride all have shortcomings such as high recovery costs, large investment and operating power consumption, and are difficult to process. Suitable for large-scale industrial production processing

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