What is the difference between the positive-pressure distillation tower and the negative-pressure distillation tower in the ammonia-alkali process?
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What are the differences in the process flows?
To date, the positive-pressure distillation process remains the most widely used typical process in ammonia-alkali plants around the world. Its characteristic is that the entire ammonia distillation system operates under positive pressure; as a result, the pre-ashing tank is sealed. The vacuum distillation process, in terms of both equipment and operation, is essentially identical to the atmospheric pressure distillation process; the only difference is that the absolute operating pressure of the ammonia vaporization system is reduced, and it is even possible to operate the entire apparatus at a pressure lower than atmospheric. Vacuum distillation can be further divided into low-vacuum distillation and high-vacuum distillation