Method for directly synthesizing dimethyl ether by CO2 of slurry reactor

Abstract

The invention relates to a method for preparing clean fuels, namely, dimethyl ether and methanol, simultaneously in one reaction process, which belongs to the technical field of energy resources. The method comprises the following process steps of: firstly, taking magnesium acetate as a precursor of magnesium, modifying a methanol dehydrating catalyst HZSM-5 molecular sieve by adopting an immersion method and drying to obtain modified MgO-HZSM-5 molecular sieve catalyst; and then, obtaining the catalyst CuO-ZnO-Al2O3-ZrO4 / MgO-HZSM-5 with the dual functions of methanol synthesis and methanol dehydration from the modified molecular sieve catalyst by adopting a coprecipitation deposition method; and finally, putting the catalyst in a high-pressure slurry reactor, taking medical paraffin oil as an inertia liquid-phase medium, and introducing H2 and CO2 so as to generate the fuel, namely, the dimethyl ether, and the byproduct, namely, the methanol, after the reaction. The invention has the advantages of short process flows, simple operation and method, low energy consumption, no pollution and low production cost and can increase the economical efficiency of CO2 chemical utilization and reach the goal of changing waste into valuable.

Description

1. Technical Field [0001] The invention relates to a method for simultaneously preparing clean fuel dimethyl ether and methanol in one reaction process, and belongs to the technical field of energy. 2. Background technology [0002] The development of the world economy, the increase of population and the improvement of people’s living standards will continue to increase the demand for energy (coal, oil, natural gas, etc.), which will inevitably lead to increasingly serious energy shortages. The world's energy shortage directly restricts the global economy. development of. Therefore, all countries are actively seeking effective solutions to energy shortages. At present, my country's energy sources are mainly coal and oil, and the output of natural gas has increased greatly in recent years. But the proportion of total energy consumption will not be very large. It is particularly pointed out that my country is one of the few countries in the world where coal is the main energy sourc...

AI Technical Summary

Problems solved by technology

CO 2 The technical core of direct synthesis of DME by hydrogenation is the research and development of catalysts with both functions of methanol synthesis and methanol dehydration. 2 The catalyst used in the direct synthesis of DME by hydrogenation is similar to the catalyst for direct synthesis of DME from synthesis gas, but the single-pass yield of methanol and DME is not high

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