Methanol synthesis process, methanol synthesis system

Abstract

The invention provides a methanol synthesis process. The process comprises the following steps of: recycling the pressure energy of the methanol separated from a methanol high-pressure separator; and carrying out flash evaporation on the methanol, from which the pressure energy is recycled. The invention also provides a methanol synthesis system applied to any methanol synthesis process provided by the invention. The methanol synthesis system comprises the methanol high-pressure separator, a flash evaporation tank, and a hydraulic turbomachine, wherein the working medium inlet of the hydraulic turbomachine is communicated with the methanol outlet of the methanol high-pressure separator, and the working medium outlet of the hydraulic turbomachine is communicated with the inlet of the flash evaporation tank. By adopting the methanol synthesis system provided by the invention, the pressure energy contained in the methanol generated by the methanol high-pressure separator can be recycled so as to prevent unnecessary energy loss.

Description

technical field [0001] The invention relates to a methanol synthesis process and a methanol synthesis system using the methanol synthesis process. Background technique [0002] Methanol is an important chemical raw material and an important product. In methanol production, after the gas from the synthesis reactor is cooled, the gas is recycled back to the reactor inlet, and the crude methanol liquid containing methanol and water enters the tank area or enters rectification to separate refined methanol. The pressure of the synthesis reactor is relatively high, up to 8.0MPa, and the pressure of the irrigation area and rectification tower is relatively low, generally around 0.4MPa. At present, methanol manufacturers are directly through the valve to make the crude methanol in the high-pressure state directly enter the irrigation area and rectification tower in the low-pressure state, and the pressure can be completely lost. If this part of the pressure can be recovered, a goo...

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Problems solved by technology

[0004] The defect of above-mentioned prior art is: the crude methanol that comes out from methanol high-pressure separator 7, pressure reaches 8.0MPa, has very high pressure energy, after filter 8, then through control valve, pressure drops to 0.4MPa, this part of energy lost

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