Patent ID: 8940926
Filing Date: 2015-01-27
Classification: B01J,C07C

Abstract:
1. A method for producing carbamate, the method comprising the steps of: a urea production step of producing urea by reaction between ammonia and carbon dioxide gas, a carbamate-forming step of producing carbamate by carbamate-forming reaction between amine, the urea, and alcohol, and by-producing a gas containing alcohol, ammonia, and carbon dioxide, an ammonia separation step of absorbing the gas with water to produce a gas absorption water, and separating ammonia, an aqueous alcohol solution separation step of separating an aqueous alcohol solution from the gas absorption water, an ammonia/carbon dioxide separation step of separating carbon dioxide gas from the aqueous ammonia solution in the gas absorption water from which the aqueous alcohol solution is separated, and an aqueous ammonia solution reusing step of using the aqueous ammonia solution along with the water for production of the gas absorption water.