Phase change absorbent for capturing CO2 in waste gas

Abstract

The invention provides a phase change absorbent for capturing CO2 in the waste gas. The phase change absorbent for capturing the CO2 in the waste gas comprises an alkylol amine absorbent, an amine absorbent, a nanoparticle, a corrosion inhibitor, an antioxidant, a defoamer and water, the mass ratio of the alkylol amine absorbent to the amine absorbent, to nanoparticles to the corrosion inhibitor to the antioxidant to the defoamer to the water in the phase change absorbent for capturing CO2 in the waste gas is (15%-20%):(5%-10%):(0.01%-0.1%):(0.01%-0.2%):(0.01%-0.2%):(0.01%-0.1%):(70%-80%). Thephase change absorbent for capturing CO2 in the waste gas increases the absorptive capacity of CO2, increases the capturing rate of CO2, reduces the corrosion rate of equipment, improves the self-stability, reduces the regeneration temperature, reduces the energy consumption of regeneration, and improves the degradation effect.

Description

technical field [0001] The invention belongs to the technical field of gas separation, in particular to a method for capturing CO in waste gas 2 phase change absorbent. Background technique [0002] Flue gas CO 2 Capture technology is to convert CO 2 Separation from flue gas after fuel combustion to achieve CO 2 Enriched process method. The pressure of ordinary flue gas is small and the volume is large, CO 2 The concentration is low and contains a lot of N 2 , so the capture system is huge and consumes a lot of energy. Currently CO 2 There are many capture technologies, mainly including physical absorption, physicochemical absorption, chemical absorption, pressure swing adsorption, membrane separation and low temperature separation. Among the many carbon dioxide capture technologies, the most mature technology is the absorption method. Among them, the chemical solvent absorption method is currently the only technology that has been tested on an industrial scale. It ...

AI Technical Summary

Problems solved by technology

This law applies to CO 2 The partial pressure is low and the purification degree is high, but due to the absorption process of the adsorbent and CO 2 undergoes chemical changes and often requires heating to regenerate, so CO 2 Energy requirements for absorbent regeneration, steam costs and degradation losses during operation are an unavoidable problem in the chemical absorption process and one of the important sources of decarbonization costs

[0004] Since the 1930s, it has been applied to CO 2 The chemical absorbent of capture technology has experienced three generations of development, from the first generation of MEA, DEA, MDEA and other absorbents to the second generation of complex amine absorbents such as AEEA, DEEA, PZ, etc., to phase change absorbents (two-phase absorbents) , anhydrous absorbents, ionic liquids and other third-generation absorbents, which make CO 2 Absorbent regeneration energy from 5.0GJ / tCO 2 Reduced to 2.8GJ / tCO 2 , but there are still problems such as low comprehensive decarburization ability of the absorbent, strong corrosion, easy foaming, high desorption energy consumption, high regeneration temperature, and weak anti-oxidative degradation ability

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