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...

Examples

Embodiment Construction

[0044] In the first step, the production of syngas and its separation:

[0045] Coal or natural gas or oilfield gas A is used to produce synthesis gas (CO+H2) through synthesis gas generator B, and CO and H2 in the synthesis gas are separated through pressure swing adsorption separation device or cryogenic separation device or membrane separation device C. The separated H2 ≥ 99.0V% hydrogen is stored in the hydrogen gas storage tank U to provide the hydrogen source required for ammonia synthesis; the separated CO gas is stored in the carbon monoxide gas storage tank D to provide CO gas for the synthesis of oxalate source. The composition of CO gas is: CO≈30~99V%, H2≈0.01~10V%, and a small amount of N2, CH4, Ar, CO2, etc. The CO raw material gas required for the synthesis of oxalate ester reaction can also use various recovered CO resources, such as: CO gas recovered from ammonia copper washing, steelmaking converter tail gas, yellow phosphorus furnace tail gas, ferroalloy fur...

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...

Examples

Embodiment Construction

[0044] In the first step, the production of syngas and its separation:

[0045] Coal or natural gas or oilfield gas A is used to produce synthesis gas (CO+H2) through synthesis gas generator B, and CO and H2 in the synthesis gas are separated through pressure swing adsorption separation device or cryogenic separation device or membrane separation device C. The separated H2 ≥ 99.0V% hydrogen is stored in the hydrogen gas storage tank U to provide the hydrogen source required for ammonia synthesis; the separated CO gas is stored in the carbon monoxide gas storage tank D to provide CO gas for the synthesis of oxalate source. The composition of CO gas is: CO≈30~99V%, H2≈0.01~10V%, and a small amount of N2, CH4, Ar, CO2, etc. The CO raw material gas required for the synthesis of oxalate ester reaction can also use various recovered CO resources, such as: CO gas recovered from ammonia copper washing, steelmaking converter tail gas, yellow phosphorus furnace tail gas, ferroalloy fur...

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