Molecular sieve drying and dehydration method by using synthetic ammonia process

Abstract

The invention provides a molecular sieve drying and dehydration method by using a synthetic ammonia process. According to the molecular sieve drying and dehydration method, when a first molecular sieve dryer is required to enter a regeneration state, a second molecular sieve dryer enters a pressure-rising state; when the pressure of the second molecular sieve dryer is greater than 5.95 MPa, the second molecular sieve dryer enters a wait state; when the first molecular sieve dryer stops adsorption, the second molecular sieve dryer starts to adsorb; the first molecular sieve dryer enters the regeneration state and enters a wait state after the regeneration is finished; when the second molecular sieve dryer is required to enter the regeneration state, the second molecular sieve dryer and the first molecular sieve dryer are exchanged to repeat the steps at the position in the step. According to the molecular sieve drying and dehydration method, vapor and residual carbon oxide capable of causing poisoning of a synthesis catalyst can be effectively removed. The energy conservation and environmental protection requirements are met, and the production efficiency of enterprises can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for drying and dehydrating molecular sieves in ammonia synthesis process. Background technique [0002] At present, in the ammonia synthesis process, the hydrogen (H 2 ) and nitrogen (N 2 ) can be synthesized into ammonia. In order to effectively separate the product ammonia from the unreacted gas, it is generally realized by cooling and freezing the ammonia to condense it. [0003] As far as industrial applications are concerned, compared with liquid nitrogen, since the cost of liquid ammonia is very low, and the requirements for equipment are not high, large-scale refrigeration systems generally use liquid ammonia as a refrigerant, that is, the circulating gas is cooled by liquid ammonia. Cooling allows the ammonia in the recycle gas to be condensed into a liquid, thereby separating it from the hydrogen and nitrogen. After heat exchange, liquid ammonia its...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the existing technology cannot economically and efficiently remove water vapor and residual carbon oxides that can cause poisoning of the synthesis catalyst, the present invention provides a method for drying and dehydrating molecular sieves in the ammonia synthesis process, comprising the following steps:

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