Energy-saving methyl mercaptan synthesis device

The utility model 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 washer, 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, and absorption liquid and hydrogen sulfide are mixed, are sequentially preheated by a preheater I, a preheater II and a preheater III and then enter a 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 a preheater II, a preheater I and a heat collector for heat exchange and then enters a multi-stage condenser to separate crude mercaptan, a non-condensable gas phase is pressurized by a compressor, one part of the non-condensable gas phase en