Reaction system and method for preparing ethanol from coal

Abstract

The invention provides a reaction system and method for preparing ethanol from coal. The reaction system comprises a methanol-to-dimethyl ether reaction unit and a dimethyl ether-to-ethanol reaction unit which are connected in order, wherein the methanol is prepared by coal gasification; the methanol-to-dimethyl ether reaction unit comprises a dimethyl ether reactor; methanol is introduced into the dimethyl ether reactor for a gas-phase catalytic dehydration reaction; and the dimethyl ether-to-ethanol reaction unit comprises a carbonylation reactor, a first micro-interface generator is arranged on the outer side of the carbonylation reactor, dimethyl ether separated from the stripping tower and carbon monoxide are introduced into the first micro-interface generator, and the dimethyl etherand the carbon monoxide are dispersed and crushed by the first micro-interface generator and then enter the carbonylation reactor for reaction. According to the reaction system provided by the invention, the energy consumption is reduced, the reaction temperature is reduced, the utilization rate of raw materials is improved, and meanwhile, the productivity is effectively improved.

Description

technical field [0001] The invention relates to the field of coal-based ethanol, in particular to a reaction system and method for coal-based ethanol. Background technique [0002] Worldwide, ethanol production routes include grain fermentation routes, petrochemical routes, and carbon-chemical routes such as coal and natural gas. The grain fermentation route is widely used in the world, and large-scale ethanol production enterprises mostly use the grain fermentation process. Affected by the "food crisis", the country has now stopped approving new corn fuel ethanol projects. The cellulose fuel ethanol project fermented with cassava and corn stalks has poor economic benefits due to factors such as high production costs, over-reliance on state subsidies, and imperfect production technology. The petrochemical route uses ethylene as raw material and produces fuel ethanol through ethylene hydration. my country relies heavily on imports of oil, and the price of ethylene is often...

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Problems solved by technology

However, this method has a series of problems such as high reaction pressure, high temperature, high energy consumption, low raw material utilization rate, and low production capacity.

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