Method for co-production of urea and methanol by treating high-concentration ammonia nitrogen and 1, 5-cyclooctadiene (COD) sewage

Abstract

The invention relates to a method for co-production of urea and methanol by treating high-concentration ammonia nitrogen and 1, 5-cyclooctadiene (COD) sewage. The existing treatment technique has the weaknesses of large investment expense, high operation cost and the like. The method comprises the steps of: firstly placing the high-concentration ammonia nitrogen, COD sewage, fine coal and coal slurry additive into a coal mill to be collectively ground so as to produce multi-element coal slurry with alkalescence concentration; and then mixing and atomizing the multi-element coal slurry with oxygen in a burner to be filled into a coal slurry gasification furnace and to be split, converted and oxidized to generate water gas; converting ammonia nitrogen and COD into carbon oxide (CO), carbon dioxide (CO2), hydrogen (H2) and nitrogen (N2), and washing, cooling and dedusting the water gas with washing water; and finally converting the water gas into H2 and CO2 through a total low temperature shift process, and separating the converted gas into H2, N2 and CO2 through a purification technique, and synthesizing H2 and N2 into ammonia and synthesizing ammonia and CO2 into urea. According tothe method, harmful substances are converted into useful chemical fertilizer raw material gas, the yield is increased without increasing the consumption, and no secondary pollution is caused.

Description

technical field

[0001] The invention relates to a method for treating high-concentration sewage, in particular to a method for co-producing urea and methanol by treating high-concentration ammonia nitrogen and COD sewage. Background technique

[0002] With the rapid development of chemical, pharmaceutical, papermaking, leather, pesticide and other industries, the resulting high ammonia nitrogen and COD sewage have also become one of the restrictive factors for the development of the industry. According to reports, in 2001, there were as many as 77 red tides in my country's sea areas. Ammonia nitrogen is one of the important causes of pollution, especially the pollution caused by high-concentration ammonia nitrogen wastewater. The direct discharge of COD sewage into the natural water body will cause the deterioration of the water quality of the natural water body, the water body will become black and smelly, destroy the water body balance, cause the death of almost all organi...

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