Method for preparing methanol and dimethyl ether by taking calcium carbide furnace tail gas and sodium chlorate tail gas as well as other hydrogen-containing gas sources as raw materials

Abstract

The invention discloses a method for preparing methanol and dimethyl ether by taking calcium carbide furnace tail gas and sodium chlorate tail gas as well as other hydrogen-containing gas sources as raw materials. The method mainly comprises the following steps: carrying out rough purification, temperature swing adsorption (TSA), pressure swing adsorption (PSA) and precise purification on the calcium carbide furnace tail gas and then mixing with hydrogen purified from the sodium chlorate tail gas and other hydrogen-containing gas sources, so as to obtain methanol synthesis gas; carrying out synthesis reaction on the methanol synthesis gas to obtain coarse methanol; and further dehydrating the coarse methanol to produce dimethyl ether, or rectifying to obtain a methanol product. According to the characteristics that the content of CO in the calcium carbide furnace tail gas is high and the content of hydrogen in the sodium chlorate tail gas and other hydrogen-containing gas sources is high, the calcium carbide furnace tail gas and sodium chlorate tail gas which are subjected to effective special treatment can serve as raw materials having higher value to be used; the purpose that the calcium carbide furnace tail gas and sodium chlorate tail gas are comprehensively utilized as the raw materials to prepare methanol and dimethyl ether is reached, the effective energies of the calcium carbide furnace tail gas and sodium chlorate tail gas as well as other hydrogen-containing gas sources are optimally utilized, thereby reaching the purposes of saving energy and reducing emission, turning wastes into wealth and improving economic benefits.

Description

technical field [0001] The invention relates to a method for preparing methanol and dimethyl ether by using calcium carbide furnace tail gas, sodium chlorate tail gas and other hydrogen-containing gas sources as raw materials, and belongs to the technical field of chemical industry. Background technique [0002] my country produces more than 15 billion cubic meters of calcium carbide furnace tail gas every year, most of which are emptied or "lighted up in the sky", which is equivalent to a loss of 2.4 million tons of standard coal per year. At the same time, 12 million tons of carbon dioxide and more than 900,000 tons of dust were emitted. The environmental pollution and waste of resources caused by the large amount of exhaust gas from calcium carbide furnaces have attracted much attention. In order to encourage enterprises to comprehensively utilize calcium carbide furnace tail gas, in 2008, the National Development and Reform Commission included the purification and resou...

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Problems solved by technology

The content of this patent is just an idea, but it is not practical at all, and it does not solve the problem of difficult purification of calcium carbide furnace tail gas

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