Synthesis method of methanol

Abstract

The present invention relates to a synthesis method of methanol. The method comprises: 1) carrying out a reaction on a synthesis gas raw material at a first temperature in the presence of a first catalyst to generate a first reaction product containing methanol; and 2) reacting the first reaction product at a second temperature in the presence of a second catalyst to generate a second reaction product containing methanol. A first reaction conducts reaction at high temperature, and the first catalyst with a high conversion rate and high heat-resistant activity is adopted, so that the yield of methanol is increased, the impurity content is reduced, meanwhile, the high-grade steam output can be increased, and the catalyst dosage is reduced; a second reactor conducts reaction at a low temperature, a second catalyst is adopted, and high space-time yield of the catalyst is guaranteed under the conditions of high alcohol partial pressure and low driving force; and in the later period of reaction, the catalyst activity is reduced, the methanol yield of the first reactor is reduced, the reaction load is transferred to the second reactor, and the two-stage reactors are matched to improve themethanol yield of the whole device.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to a method for synthesizing methanol. Background technique [0002] At present, the large-scale methanol synthesis technology mainly adopts two-stage methanol synthesis technology: water-cooled-air-cooled two-stage methanol synthesis technology and water-cooled-water-cooled two-stage methanol synthesis technology. Among them, the water-cooled-air-cooled two-stage methanol synthesis technology uses a water-cooled methanol synthesis tower for the first reaction, which produces high-grade steam by-products, and an air-cooled methanol synthesis tower for the second reaction. The reactor has both functions of a heat exchanger and a reactor; Water-cooling-water-cooling two-stage methanol synthesis technology uses a water-cooled methanol synthesis tower for the first reaction, which produces high-grade steam by-product, and a water-cooled methanol synthesis tower for the second...

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Problems solved by technology

[0003] In the existing methanol synthesis reaction, although the two-stage reactors adopt different types, it is beneficial to improve the conversion rate of the product to a certain extent, but the existing two-stage reactors all use the same catalyst, not only the one-time investment cost is high, The life of the catalyst is shortened, and the by-products increase significantly in the later stage of the reaction; moreover, the high alcohol partial pressure at the outlet of the primary reactor will inhibit the progress of the equilibrium reaction of methanol, and the use of the same type of catalyst in the secondary reactor will greatly reduce its reaction conversion rate

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