Process for preparing gasoline through synthesis gas

Abstract

A process for preparing gasoline through synthesis gas is characterized in that pressurized synthesis gas is sent into a slurry bed reactor loaded with a catalyzer for synthesizing dimethyl ether to synthesize dimethyl ether, gas coming from the slurry bed reactor directly enters into a fixed bed reactor loaded with a catalyzer for synthesizing gasoline to synthesize gasoline, one part of mixed gas coming from the fixed bed reactor enters into a gas-liquid separator after being preheated for synthesizing gas through a heat exchanger, the rest part of the mixed gas enters into the gas-liquid separator after the heat of the rest part is recycled through an exhaust boiler, then liquid phase and gas are obtained after separation, the liquid phase comprises gasoline and water, one part of gas is discharged or used for other purposes, and the other part of gas circulates and returns to the slurry bed reactor through a compressor. The process provided by the invention has the advantages that the conversion per pass of the synthesis gas is high, energy consumption is low, the cost is low, and the service life of the catalyzer is long.

Description

technical field [0001] The invention belongs to a synthetic gas gasoline production process, in particular to a slurry bed-fixed bed combined gasoline production process. Background technique [0002] my country is rich in coal and lacks oil. It is estimated that by 2020, my country's dependence on foreign oil may be close to 65%. Therefore, the development of alternative energy sources for oil is imminent, and coal-to-oil has become an important trend in my country's energy strategy. [0003] At present, the coal-to-liquids process mainly includes the direct liquefaction process and the indirect liquefaction process of coal. The process conditions of direct coal liquefaction are very harsh, and the products are complex and difficult to separate; the indirect coal liquefaction technology is to first gasify coal into synthesis gas, and then use coal-based synthesis gas (carbon monoxide and hydrogen) as raw materials, at a certain temperature and pressure, It is a process for...

AI Technical Summary

Problems solved by technology

In this patent, a fixed bed is used to produce methanol from syngas, but since the methanol synthesis reaction (1) is a strong exothermic reaction, the catalyst is easily deactivated under high temperature conditions during the reaction process, requiring a large amount of circulating cooling medium, and must Limit the conversion rate of synthesis gas, so that the catalyst cannot be sintered and deactivated due to too much heat generated due to too high conversion rate. Therefore, the process has high energy consumption and low product yield

Methanol dehydration includes two-step reactions (2) and (3), both of which are strongly exothermic reactions. During the reaction process, the catalyst is easily coked and deactivated at high temperature, which shortens the life of the catalyst and does not meet the requirements of industrial production.

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