1979 Otsuka Mitsui 4154760 Urea Process

A urea synthesis process is improved by providing an easy means of maintaining the urea synthesis zone in the process at a constant temperature. The improvement involves adjusting the amount of starting ammonia which is fed into the urea synthesis zone in response to any change in the temperature in the urea synthesis zone so that the urea synthesis zone is maintained at a substantially fixed temperature.


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