Melamine and ammonium carbonate joint production technology

Abstract

A process for preparing cyanuramide and ammonium dicarbonate includes preheating ammonia gas as carrier, introducing it to fluidized-bed reactor, pumping urea in said reactor, high-temp catalytic decomposing to generaet the reactive gas containing cyanuramide, CO2 and ammonia, filtering, cooling to educe out cyanuramide, washing the tail gas by ammonia water, coding, carbonizing to obtain cabonized ammonia water, preparing ammonium dicarbonate, mixing said cyanuramide with its mother liquid, thermal dissolving, filtering, cooling for crystallizing, centrifugal separating, drying and pulverizing to obtain finished cyanuramide.

Description

technical field [0001] The invention relates to a process for producing melamine, in particular to a co-production process of melamine and ammonium bicarbonate. Background technique [0002] The current production of melamine, such as taking the existing domestic melamine production enterprises with an annual output of 1,000 tons as an example, adopts the domestic normal pressure production process, that is, in the production process, ammonia is used as the carrier gas and the tail gas is recycled. Since no water is allowed in the urea synthesis reaction of melamine, the carrier gas ammonia must be separated and removed by ammonia cold drying. plus CO in the exhaust 2 After washing, the whole device needs to have a tail gas washing system, an ammonia cold drying system, and an ammonia gas circulation system, resulting in a large investment in the whole device. Due to the exhaust gas circulation in the existing domestic atmospheric production proc...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a co-production process of melamine and ammonium bicarbonate to solve many deficiencies in the existing domestic production process of melamine under atmospheric pressure.

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