Method for preparing methyl alcohol and dimethyl ether by carrying out sulfur-tolerant isothermal transformation on tail gas of calcium carbide furnace

Abstract

The invention provides a method for preparing methyl alcohol and dimethyl ether by carrying out sulfur-tolerant isothermal transformation on tail gas of a calcium carbide furnace. The method mainly comprises the following steps: pressurizing, carrying out sulfur-tolerant isothermal transformation, carrying out temperature swing adsorption purification, carrying out pressure swing adsorption purification, compressing, synthesizing methyl alcohol and dimethyl ether, synthesizing purge gas and extracting hydrogen, and carrying out waste gas treatment. A transformed technology enables operational flexibility of a production system to be higher, balance production can be carried out with or without sodium chlorate tail gas, all the tail gas of the calcium carbide furnace can be utilized, yield is increased, and a sky lantern is not lighted, so that the environment is not polluted. By reducing wet desulphurization, dry desulphurization, deoxidization and dearsenization processes, energy loss in a gas transportation process is reduced. Besides, pressure swing adsorption hydrogen recovery rate is increased, and the aim of saving energy is achieved. The improved technology is advanced, technological process is greatly shortened, whole program control on operation is realized, and a man-made operational error is reduced.

Description

technical field [0001] The invention relates to the technical field of organic chemical raw material production, in particular to a method for producing methanol and dimethyl ether by using sulfur-resistant isothermal conversion of calcium carbide furnace tail gas. Background technique [0002] The exhaust gas produced by calcium carbide furnaces in my country exceeds 15 billion standard cubic meters every year, and most of them are emptied or "lighted skylights", which is equivalent to a loss of 2.4 million tons of standard coal per year. Simultaneously emit 12 million tons of CO 2 and 1 million tons of dust. It not only causes great environmental pollution, but also causes great waste of recyclable resources. In order to change the mode of economic development, the state has issued energy conservation and emission reduction targets, and local governments have issued specific emission reduction targets. The composition of calcium carbide furnace tail gas is complex, as s...

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Problems solved by technology

[0023] The purpose of the present invention is to provide a method for producing methanol and dimethyl ether by sulfur-resistant isothermal conversion of calcium carbide furnace tail gas, so as to overcome the problems of high energy consumption, complicated process steps, small operation flexibility and high operation intensity in conventional methods.

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