A slurry bed methanol synthesis process

Abstract

The invention relates to a slurry reactor methanol synthesis process. The slurry reactor methanol synthesis process is characterized by comprising the following steps: mixing raw material gas from upstream with circulating gas to form mixed gas, enabling the mixed gas to enter a shell side of the reactor from the bottom after heat exchange to be in contact with a catalyst in the shell side to perform reaction; enabling bubble point boiler water to enter a tube side of the reactor; discharging the reaction gas generated by the reaction out of the top of the reactor and enabling the reaction gas to enter a separator to perform separation; enabling the separated non-gas phase to return to the reactor from the gas phase space at the upper part of the reactor, enabling the separated gas phase, namely crude methanol synthesis gas, to enter a gas liquid separator after heat exchange, pressurizing the separated gas phase to serve as circulating gas, wherein the separated liquid phase is crude methanol; when catalyst abrasion reaches to a set value, extracting catalyst slurry from the reactor; supplementing fresh catalyst slurry into the shell side of the reactor. According to the slurry reactor methanol synthesis process, the catalyst can be changed timely without shutdown.

Description

technical field [0001] The invention relates to a methanol synthesis process, in particular to a slurry bed methanol synthesis process. Background technique [0002] At present, the production of methanol from coal and natural gas at home and abroad basically adopts the gas-solid phase catalytic method. Since methanol synthesis is a strong exothermic reaction process, the gas-solid phase catalytic reactor is limited by heat transfer. Poor adaptability, the content of CO in the reaction gas at the inlet of the reactor has to be controlled at a relatively low level, generally no more than 16%, and the conversion rate of the synthesis gas once passed through the reactor is not high, so the content of methanol in the outlet gas is correspondingly low. A large amount of unreacted gas must be recycled, which consumes a lot of power. [0003] Slurry bed technology is used for methanol synthesis. The reactor contains three phases of gas, liquid and solid. Synthesis gas is reacted t...

AI Technical Summary

Problems solved by technology

The reaction heat removal of this technology is lagging behind, the reaction temperature is high, the single-pass conversion rate is low, and the inert solvent is easily entrained to the downstream; moreover, the catalyst cannot be replaced online, and the device must be shut down when the catalyst is replaced, which affects the economic benefit of the device

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