Technology and device forsynthesizingmethanol

Abstract

The invention discloses a technology for synthesizing methanol. The technology comprises the following steps: generating methanol by a methanol synthesis gas containing fresh gas through a first reactor; exchanging the heat of the mixed gas containing the synthesis gas and methanol steam with the heat of the synthesis gas containing fresh gas to be fed into the first reactor and then generating methanol through a second reactor; cooling the synthesis gas in higher methanol concentration after the reaction, and then guiding into a methanol separator and separating methanol; mixing the synthesis gas after separating methanol with fresh gas, thereby acquiring the synthesis gas containing fresh gas; guiding the synthesis gas containing fresh gas into the first reactor again; utilizing a valve A to directly guide a part of fresh gas into the second reactor and controlling the hot-spot temperature of a catalyst bed of the second reactor within 250 DEG C; keeping a part of synthesis gas containing fresh gas free from heat exchange and directly introducing into the first reactor by a valve B; controlling the gas inlet temperature of the second reactor at 200-240 DEG C. According to the invention, the use ratio of the catalyst is increased, the quality of the methanol product is improved and the running stability of the production device is improved.

Description

technical field [0001] The invention relates to a methanol synthesis process and device. Background technique [0002] Methanol is a very important bulk organic chemical product, mainly used in downstream products such as methanol-to-olefins, formaldehyde, dimethyl ether, and acetic acid; due to the growing demand for methanol-to-olefins in my country, the demand for methanol products is also increasing. According to the statistics of the industry statistics department: in 2016, my country's methanol production capacity was about 79.82 million tons per year, the output was 43.13 million tons, the imported methanol was 8.8 million tons, and the demand was 51.93 million tons per year; it is estimated that my country's methanol production capacity will be about 86.22 million tons in 2020 / year, the demand is 76.61 million tons / year, and the gap is more than 7.6 million tons; it is estimated that my country's methanol production capacity will be 117.12 million tons / year in 2025, ...

AI Technical Summary

Problems solved by technology

[0010] The object of the present invention is to provide a process and device for methanol synthesis aiming at the problems existing in the existing methanol reactor series process technology

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