Technical method for preparing low-carbon mixed alcohol and natural gas by synthetic gas one-step method from coal

Abstract

The invention provides a technical method for preparing low-carbon mixed alcohol by a synthetic gas one-step method from coal, which comprises the following specific steps that coal is gasified, the gas is purified, and desulfurizing is conducted by a chemical adsorption method to obtain synthetic gas consisting of hydrogen and carbon; then the synthetic gas is in contact with a Cu-based sulfide catalyst under the condition of high pressure for a catalytic reaction, the reacted gas is subjected to heat exchange, condensation and liquid separation, a liquid-phase component and tail gas are obtained, the liquid-phase component is low-carbon mixed alcohol, and the low-carbon mixed alcohol mainly containing alcohols and a small amount of C1-C4 gaseous hydrocarbon are generated through catalytic synthesis. According to the method, the coal is used as the raw material to synthesize the low-carbon mixed alcohol, the final products are the low-carbon mixed alcohol and the C1-C4 gaseous hydrocarbon, the low-carbon mixed alcohol is used as the chemical raw material, the C1-C4 gaseous hydrocarbon is used as the fuel, the final products are not wasted, and pollution is avoided. The Cu-based sulfide catalyst is used as the catalyst, such that the disadvantage of low activity of the existing catalyst is changed, and the production speed of the low-carbon mixed alcohol is improved.

Description

technical field [0001] The invention belongs to the technical field of preparing alcohols from coal through synthesis gas, and in particular relates to a technical method for preparing low-carbon mixed alcohol and natural gas in one step by utilizing coal through synthesis gas. Background technique [0002] With the continuous development of the national economy, China's energy supply problem has become increasingly prominent. Since my country has a unique energy structure of "rich coal, poor oil and little gas", the development of coal chemical industry is of great significance to solve the problem of my country's dependence on foreign crude oil imports. At this stage, the processes of coal-to-synthesis gas, coal-to-synthesis gas to natural gas, and synthesis gas to methanol are relatively mature and have been applied industrially in my country. However, the products of these processes have disadvantages such as low added value and poor anti-risk ability of device operatio...

AI Technical Summary

Problems solved by technology

Nowadays, when synthesizing low-carbon mixed alcohols, the synthesis efficiency is low and the activity of the catalyst selected in the synthesis process is low and unstable, and no other catalyst with high activity has been found, and the exhaust gas generated at the end is too much, and it is generally discharged to In the air, it is easy to cause ring pollution