Fixed-bed low-temperature methanol synthetic method with three functions of heat taking, mass transferring and catalyzing

Abstract

The invention provides a fixed-bed low-temperature methanol synthetic method with three functions of heat taking, mass transferring and catalyzing, and relates to a method for synthesizing the methanol. The method is characterized in that alcoholic solution is adopted and used as a homogeneous catalyst to play a role in the reaction and catalyze the reaction, and the alcoholic solution is also used as a nucleophilic reagent to attack formate attached on the surface of the catalyst, in order to generate formic ether; simultaneously, the alcohol solution is used as a mobile phase for realizing the quick heating effect; the methanol synthetic reaction is a high exothermic reaction; the low temperature is beneficial for carrying out the methanol synthetic reaction toward the positive direction; in addition, the alcohol solution serving as a medium in mass transferring is used for dissolving a reaction product methanol and a byproduct water, and taking the methanol and the water away from the catalyst surface and a reactor, therefore, the reaction can be carried out smoothly; and the adopted alcohols can be methanol, ethanol, propanol, 2-propanol, butanol, a butanol isomer and the like. According to the fixed-bed low-temperature methanol synthetic method with three functions of heat taking, mass transferring and catalyzing, the synthetic gas containing 0 to 60% of CO2 is systemically searched, the 2-propanol is adopted as a solvent at 180 DEG C under 5.0MPa, the percent conversion of the total carbon is stable in more than 80%, and the selectivity of the methanol is more than 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 tota...

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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