A set of equations describing equilibrium compositions of liquid and gas phases in a reaction mixture formed in the synthesis of melamine from urea at high pressures was derived. A numerical solution of the set in a pressure range of 5–15 MPa, temperatures range of 350–400°C, and at an ammonia to urea ratio from 0 to 1 mol mol−1 enabled determining the equilibrium output of melamine and byproducts. It was shown that in the range of parameters under study an increase in temperature and amount of ammonia introduced and a decrease in pressure in melamine synthesis can lead to a higher content of impurities in the product.
Russian Journal of Applied Chemistry – Springer Journals
Published: Jul 24, 2013
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