A two-phase mixture for capturing carbon dioxide

Abstract

The invention provides a novel two-phase mixture for trapping carbon dioxide, and belongs to the field of technologies for trapping carbon dioxide gas. The novel two-phase mixture comprises two phases including, by weight, 99.0-99.5 wt% of non-aqueous solution and 0.5-1.0 wt% of porous solid materials. The non-aqueous solution comprises, by weight, 30-50 wt% of solutes and 50-70 wt% of solvents, and the solutes are N-ethylethanolamine; the solvents are N, N-diethyl ethylene diamine. The solid porous materials are TiO (OH) 2. The novel two-phase mixture has the advantages that the non-aqueous solution is modified by the TiO (OH) 2, absorption effects of the non-aqueous solution cannot be improved by the TiO (OH) 2, but the desorption rate can be greatly increased by the TiO (OH) 2, the optimal desorption rate can reach 250 Nm<3> CO2 / m<3> solution, and the desorption rate can be increased as compared with the original non-aqueous solution.

Description

technical field [0001] The invention belongs to the technical field of gas separation, and relates to a two-phase mixture for capturing carbon dioxide. The adopted technology is: modifying the non-aqueous solution by adding a small amount of titanium oxide compound. Background technique [0002] How to reduce CO 2 Emissions have become an important issue in the 21st century. According to the prediction of the International Panel on Climate Change (IPCC): by 2100, the atmospheric CO 2 The concentration will reach 570ppmv, this phenomenon will bring a series of environmental problems, such as: global warming, sea level rise and so on. It is well known that CO produced by human activities 2 Nearly 1 / 3 of that comes from the burning of fossil fuels. Different industrial production sectors emit large amounts of CO 2 , such as: refineries, cement plants, ironworks, power plants, lime plants, magnesia plants, etc. capture and store CO 2 ways to reduce atmospheric CO 2 conte...

AI Technical Summary

Problems solved by technology

[0010] In summary, at present, MEA, DEA, AEEA, etc. are mainly used as main absorbents, MDEA, etc. are used as absorption aids, and a decarburized aqueous solution composed of a variety of active components with strong absorption capacity, preservatives, corrosion inhibitors, etc. , although they have their own advantages, their comprehensive decarburization ability is generally low, the regeneration energy consumption is high, the solvent circulation is large, and the equipment is highly corrosive

Since the active components of these solvents are generally in the range of 30%, the remaining nearly 70% of the solvent is water, due to the absorption of CO 2 The solution (commonly known as rich solution) needs to be heated to 100-120°C during the regeneration process. At this temperature, with the decomposition of the absorption intermediate, a large amount of water will evaporate, resulting in high energy consumption for regeneration; The evaporated water also needs to be condensed at the top of the regeneration tower to maintain the balance of water in the system. During the condensation process, the amount of condensed water required is large, so the cost of using the decarburization solution with water has always been high, which cannot make economic benefits Optimal, so there is still room for improvement

[0011] To this end, our research group is committed to the development of non-aqueous solvents. In 2011, we applied for a patent on the capture of carbon dioxide by non-aqueous solvents (application number: 2011102305706), using benzyl alcohol, phenylethyl alcohol, N-methylpyrrolidone and their mixtures as Solvent has high absorption and desorption capacity, but this patent does not break the traditional non-aqueous solvent research idea, and uses alcohol and ketone mixture as solvent, and no breakthrough has been made

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