What is the relationship between urea production and ammonia synthesis?
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What is the actual relationship between the urea stripping tower and the urea synthesis tower? Is the raw material for the Snam urea production process liquid ammonia or ammonia gas? How is the urea production process connected to the upstream ammonia synthesis process? Does ammonia need to be compressed to very high pressures? Is an ammonia compressor required? Is ammonia cryogenic production intended for the manufacture of liquid ammonia for sale, or to provide the raw material for liquid ammonia in the downstream urea production process?
A liquid ammonia pump is required. The pressure of liquid ammonia is determined based on the pressure in the urea process. The raw material for urea, carbon dioxide gas, is produced by decarburization in the ammonia synthesis process. A carbon dioxide gas compressor is needed.
The carbon dioxide gas method for urea production in Cabon mainly consists of four key components: a high-pressure ammonium methanate condenser, a synthesis tower, a stripping tower, and a high-efficiency scrubber. Urea synthesis occurs in two steps; in the first step, ammonium carbamate is formed in a high-pressure ammonium methanate condenser. This is an exothermic reaction that allows equilibrium to be reached rapidly. The main reaction taking place in the synthesis tower is the dehydration of methylamine to produce urea, and this is the critical step. The liquid from the synthesis tower passes through a stripping tower; the liquid phase goes to the distillation tower, while the gaseous phase, which is carbon dioxide gas after passing through a compressor, enters the high-pressure cooling unit.