Treatment method of methanol rectification wastewater in coal chemical industry

Abstract

The invention relates to the field of sewage treatment, in particular to a treatment method of methanol rectification wastewater in the coal chemical industry. The treatment method comprises steps as follows: coal is primarily broken, coal with the particle size of 150-50 meshes is crude coal powder, and coal with the particle size smaller than 50 meshes is fine coal powder; 59-63 parts of the coal powder, 31-37.5 parts of slurrying water, 5-9 parts of activated sludge and 0.4-0.8 parts of a dispersing agent are weighed in parts by weight, and the mass ratio of the crude coal powder to the fine coal powder is 3:7; the slurrying water, the activated sludge and the dispersing agent are stirred and uniformly mixed, and the molecular structure of the dispersing agent is sufficiently spread; the coal powder is gradually poured into the mixture obtained in the step 2, the stirring rotation speed is increased, and after all the coal powder is added, the mixture continues to be stirred for 20-25 min, and methanol rectification wastewater, sludge and coal slurry is obtained. Organic matters, such as alcohols, a little oil and the like, in the methanol rectification wastewater can generate heat in the gasification process, the organic matters in the wastewater can be sufficiently used, resource utilization of the methanol rectification wastewater is realized, and the treatment problem of the methanol rectification wastewater is fundamentally solved.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for treating coal chemical methanol rectification wastewater aimed at the field of coal chemical industry. Background technique [0002] In the process of coal chemical industry, raw coal gasification produces crude synthesis gas. The crude synthesis gas enters the methanol synthesis unit after transformation, low-temperature methanol washing and sulfur recovery section purification. Crude methanol is synthesized in the methanol synthesis unit and methanol rectification is carried out. The production is qualified Methanol for use in subsequent sections. [0003] In the process of methanol synthesis and methanol rectification, a certain amount of waste water will be generated at the bottom of the synthesis tower, the bottom of the pre-rectification tower and the bottom of the main rectification tower. This part of wastewater mainly contains methanol, and also contains a l...

AI Technical Summary

Problems solved by technology

[0006] At present, the conventional methanol industrial wastewater treatment methods mainly include steam stripping and biochemical treatment methods, which require separate treatment of wastewater, high operating costs and low resource utilization, which restrict the development of the coal chemical industry.