A kind of synthesis method of fixed bed low temperature methanol with heat and mass transfer catalysis triple effect

Abstract

A method for synthesizing low-temperature methanol in a fixed-bed with heat-mass-transfer catalysis, involving a method for synthesizing methanol. In this method, the alcohol solution acts as a homogeneous catalyst to participate in and catalyze the reaction, and acts as a nucleophile to attack the formate adsorbed on the surface of the catalyst. , to generate formate; at the same time, the alcohol solution acts as a mobile phase to quickly remove heat. The methanol synthesis reaction is a strong exothermic reaction, and the low temperature is conducive to the positive direction of the methanol synthesis reaction; in addition, the alcohol solution is used as a mass transfer medium. The reaction product methanol and by-product water are taken away from the surface of the catalyst and the reactor to make the reaction proceed smoothly. The alcohol used may be methanol, ethanol, propanol, 2-propanol, butanol and isomers of butanol and the like. The present invention systematically studies the synthesis gas with CO2 content of 0-60%. At 180°C and 5.0MPa, with 2-propanol as solvent, the conversion rate of total carbon is stable above 80%, and the selectivity of methanol is high. at 95%.

Description

technical field [0001] The invention relates to a method for synthesizing methanol, in particular to a method for synthesizing low-temperature methanol in a fixed-bed with heat-mass-transfer catalysis triple action. Background technique [0002] Rapid development of a number of strategic emerging industries such as clean energy, energy conservation and environmental protection (page 4 of the 2013 Government Work Report, P4); solidly promote energy conservation, emission reduction and ecological environment protection (P5); establish an ecological compensation system, develop emission rights and carbon Emissions trading pilot (P10). In the suggestions for this year's government work, it is mentioned that we must adhere to the basic national policy of saving resources and protecting the environment, and strive to promote green development, circular development, and low-carbon development. Vigorously promote the conservation and recycling of energy resources, control the total...

AI Technical Summary

Problems solved by technology

[0004] known industrial CO 2 Conversion pathways include: (1) Catalytic reforming of methane and carbon dioxide to produce synthesis gas, however, this reaction needs to be carried out at high temperature (>650°C), and the catalyst is easily deactivated by sintering

(2) CO 2 with liquid NH 3 The reaction produces urea, but the addition of nitrogen makes the downstream product unsuitable for energy applications (NO x freed)

However, the slurry bed low-temperature methanol synthesis process has the following disadvantages (1) CO in the synthesis gas 2 (2) The effect of alcohol solvent as a heat extraction agent is limited; (3) The mass transfer effect is poor, and the product and solvent are mixed together, which is not conducive to the positive direction of the reaction

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