Decarburization method adopting diethyl carbonate as absorbent

Abstract

The invention provides a decarburization method adopting diethyl carbonate as an absorbent. The method comprises the following steps: firstly enabling raw material gas containing CO2 to pass through the diethyl carbonate for absorption and decarburization, then enabling absorbent pregnant solution after absorbing the CO2 to pass through two-stage decompression desorption, and enabling the CO2 gasgenerated by desorption to pass through compression, cooling and recovery of a solvent, namely the diethyl carbonate, entrained in the gas phase, and then be discharged out of a boundary region. Compared with the propene carbonate method which is maturely applied in the industry at present, the developed diethyl carbonate decarburization process can reduce the energy consumption by above 30%; compared with the polyethylene glycol dimethyl ether method, the price of the solvent is lower, the polymerization loss can be reduced by above 50%; compared with the low-temperature methanol washing process, the operation temperature is more moderate, and equipment investment can be reduced by more than 30%. The CO2 removal efficiency can be more than 85%-95%.

Description

technical field [0001] The invention relates to a method for absorbing and removing CO from medium and high pressure gas mixtures, including synthesis gas, shift gas and IGCC gas 2 The technology belongs to the technical field of chemical engineering. Background technique [0002] Global warming has become an undisputed fact. Greenhouse gas CO 2 emissions are a major contributor to climate warming. How to get from rich CO 2 Capture and separation of CO in the gas mixture of synthetic gas, shift gas and IGCC gas 2 extremely important. [0003] According to different application occasions and the pressure of feed gas, the decarburization method can be divided into dry method and wet method. Dry methods include adsorption methods and membrane methods, and are generally applicable to CO 2 Where the concentration is low; the wet method can be divided into chemical absorption method and physical absorption method, and the chemical absorption method is mostly used in occasio...

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Problems solved by technology

[0006] In view of the shortcomings and defects of the existing low-temperature methanol washing method, which have long process flow, large equipment investment, small absorption capacity of absorbent in the propylene carbonate method, large circulation volume, high cost of polyethylene glycol dimethyl ether method, and prone to polymerization loss, The invention provides a decarburization method using diethyl carbonate as an absorbent to further simplify the process and reduce costs

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