A continuous process for synthesizing oxamide

Abstract

The invention discloses a continuous process for synthesizing oxamide, which belongs to the fields of catalysis, chemical industry, environmental protection and fertilizer. Coal-based synthesis gas is used to obtain H2≥99.0V% hydrogen and industrial CO through pressure swing adsorption separation technology; N2≥99.0V% nitrogen and industrial O2 are obtained through air through cryogenic separation technology. Use H2≥99.0v% hydrogen and N2≥99.0v% nitrogen to mix according to the ratio of N2:H2=1:3, and send them to the ammonia reaction tower to produce synthetic ammonia; industrial CO gas is sent to react with RONO gas after dehydrogenation, oxygen removal, and water removal The tower catalyzes the synthesis of oxalate, and the NO in the reaction tail gas is reacted with industrial O2 and an alcohol-water solution with an alcohol content of ≥10wt% to generate RONO for recycling; the synthesized oxalate and synthetic ammonia are directly sent to the reactor to synthesize oxamide, a slow-acting nitrogen fertilizer, Substituting urea or ammonium bicarbonate for agricultural and animal husbandry production has good economic and social benefits, and is an important development direction of C1 chemical and nitrogen fertilizer industries.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, catalysis, chemical fertilizer and environmental protection, and relates to a complete "continuous process for synthesizing oxamide" by using coal or natural gas through synthesis gas. This complete "synthetic oxamide continuous process" all uses industrial coal, industrial CO, industrial NO, industrial oxygen, industrial nitrogen, industrial hydrogen and industrial alcohols as reaction raw materials. The whole process consists of synthetic ammonia, synthetic oxalate and synthetic oxalate The oxamide is composed of three main parts to realize the continuous large-scale industrial production of the slow-acting nitrogen fertilizer oxamide. Background technique [0002] Both urea and ammonium bicarbonate are quick-acting nitrogen fertilizers that are easily soluble in water. In 2009, the world's urea production capacity reached about 159.2 million tons, and the demand was about 154.8 mill...

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Problems solved by technology

[0018] So far, there has been no report of using coal or natural gas through synthesis gas "synthetic oxamide continuous process"; nor have there been any direct adoption of pressure swing adsorption separation technology or membrane separation technology or cryogenic separation technology to produce N2 gas and H2 gas is directly used in the report of producing synthetic ammonia; more do not see the report of the production process of producing nitrogen fertilizer industry that synthetic ammonia is directly used in the production of slow-acting nitrogen fertilizer oxamide, and completely replaces high-temperature, high-pressure synthetic urea

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