Method and device for preparing highly pure hydrogen and carbon monoxide

Abstract

The invention discloses a method and a device for preparing highly pure hydrogen and carbon monoxide from synthetic gas and carbon monoxide-rich tail gas obtained after ethanol synthesis through using a membrane separation-pressure swing adsorption integration technology. Liquid methanol is used to absorb dimethyl ether in the carbon monoxide-rich tail gas obtained after the ethanol synthesis in order to reduce the content of the dimethyl ether harmful to a membrane separation device to 0.5% or less, so the long-term stable running of the membrane separation device is ensured; and the carbon monoxide-rich tail gas obtained after the ethanol synthesis is effectively treated to make the carbon monoxide-rich tail gas recycled, so the energy saving and discharge reduction effects are effectively realized. The method and the device for preparing the highly pure hydrogen and high concentration carbon monoxide from the synthetic gas through the membrane separation-pressure swing adsorption integration technology have the advantages of energy consumption reduction, space saving and investment reduction.

Description

technical field [0001] The invention belongs to the field of synthetic ethanol industry, and in particular relates to a method and device for producing high-purity hydrogen and carbon monoxide from synthesis gas and ethanol-synthesized carbon monoxide-rich tail gas by using membrane separation-pressure swing adsorption integration technology. Background technique [0002] Ethanol is an important chemical raw material with a wide range of uses. Ethanol can be used to manufacture acetic acid, beverages, flavors, dyes, fuels, etc. Ethanol with a volume fraction of 70%~75% is also commonly used as a disinfectant in medical treatment, and it is widely used in national defense industry, medical and health care, organic synthesis, food industry, and industrial and agricultural production. The main methods of industrial synthesis of ethanol are grain fermentation, ethylene hydration, acetaldehyde hydrogenation, synthesis gas (mainly carbon monoxide and hydrogen) oxo synthesis, etc. ...

AI Technical Summary

Problems solved by technology

Traditionally, pressure swing adsorption technology is generally used to produce high-purity hydrogen and carbon monoxide, but there are problems such as high energy consumption (carbon monoxide needs to be pressurized from normal pressure to synthesis pressure), large floor space, and high investment.

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