Energy-saving methyl mercaptan synthesis device

Abstract

The invention discloses an energy-saving methyl mercaptan synthesis device which comprises a mixer, a preheater I, a preheater II, a preheater III, a reactor, a heat collector, a multi-stage condenser, a compressor, a tail gas scrubber, a methanol precooler, a refrigerator and a gas-liquid separator. Methanol is pre-cooled and then used for washing part of circulating gas; non-condensable gas is emptied after gas-liquid separation; absorption liquid and hydrogen sulfide are mixed and sequentially preheated by the preheater I, the preheater II and the preheater III and then enter the reactor; a heating medium enters from the lower part of the reactor, exchanges heat through the preheater I and is discharged; synthesis gas produced by the reactor sequentially passes through the preheater II, the preheater I and the heat collector for heat exchange and then enters the multi-stage condenser to separate crude mercaptan, a non-condensable gas phase is pressurized by the compressor, one part of the non-condensable gas phase enters a tail gas washing device, and the other part of the non-condensable gas phase and hydrogen sulfide enter the mixer together; and the heat taken by the heat collector is prepared into chilled water through the refrigerator for pre-cooling methanol. The device fully utilizes heat, the separation process of inert gas and hydrogen sulfide is reasonable, and the energy consumption is obviously reduced.

Description

technical field [0001] The invention belongs to the field of chemical production, in particular to an energy-saving methyl mercaptan synthesis device. Background technique [0002] Methyl mercaptan belongs to the smallest relative molecular weight among organic mercaptans. It is very active and easily reacts with other substances to form sulfur-containing substances. Therefore, methyl mercaptan has a wide range of uses and is the main raw material for the synthesis of pesticides, medicines, food and synthetic materials. [0003] CN 1186067A discloses a method for continuous production of methyl mercaptan by catalytic reaction of methanol and hydrogen sulfide, the major improvement lies in the pretreatment of the feed gas mixture and the utilization of heat of reaction and heat in the product gas mixture. The heat of the synthesis gas is only used for methanol evaporation and preheating. The temperature of the synthesis gas after methanol evaporation and preheating is still 1...

AI Technical Summary

Problems solved by technology

The small liquid droplets in the residual gas are removed by condensation, which not only increases the consumption of cooling medium, but also increases the investment

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