Process for preparing dimethyl ether

Abstract

The disclosed preparation method for dimethyl ether comprises: composing methanol with purified synthetic gas in synthesis reactor; flash evaporating the coarse methanol condensate to some pressure; at the minimum limit of keeping the heat energy and pressure energy of synthesis system, sending the coarse methanol and incondensable gas contained saturated methanol gas together into the synthesis process; gasifying the coarse methanol to dewater in dewatering reactor and obtain the coarse dimethyl ether; then rectifying the coarse product in tower to prepare the final product. This invention integrates and optimizes the process to reduce energy consumption and cost, and improve yield and competitive power.

Description

technical field [0001] The invention relates to a process for producing dimethyl ether. technical background [0002] Dimethyl ether is a promising chemical product. As a chemical raw material, in addition to replacing chlorofluorocarbons in the aerosol industry as a spray carrier to reduce the damage of aerosols to the atmospheric ozone layer, it is also an intermediate for the production of synthetic gasoline and olefins, which can replace the traditional ones made from petroleum. Production routes for gasoline and olefins. Dimethyl ether is an ideal clean fuel, which is not only a substitute for diesel fuel consumed in large quantities, but also can be used as a domestic fuel to replace LPG consumed in large quantities. Using coal as raw material to produce fuel-grade dimethyl ether instead of LPG is of great significance to reduce the pressure of my country's current large-scale import of LPG and reduce foreign exchange consumption, and its potential market is also ver...

AI Technical Summary

Problems solved by technology

Described method is all with methanol as starting raw material, but uses the catalyst of different properties, and they are the production method commonly called " two-step method " that is widely used in industrial production at present, and it is restricted by methanol market, and because dimethyl ether The production is separated from the methanol production unit, the energy consumption is high, the production cost of the product is high, the economy is poor, and it is difficult to adapt to large-scale production

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