Special MDEA formula solution activated by functional ion liquid for CO2 gas absorption separation

Abstract

The invention relates to a special N-methyldiethanolamine formula solution activated by ion liquid for CO2 gas absorption separation, which consists of the following ingredients in mass percent: 35 to 50 percent of N-methyldiethanolamine, 5 to 20 percent of low-viscosity kalescent functional ion liquid, 15 to 30 percent of dimethyl ether of polyethlene glycol and / or sulfolane and 15 to 30 percent of water, wherein cations of the low-viscosity kalescent functional ion liquid are tetraalkylammonium ions, and anions of the low-viscosity kalescent functional ion liquid are amino acid radicals or organic carboxylate anions. The formula solution of the invention has the advantages that the high mass transfer performance of the absorption-desorption process is improved, the material consumption in the use process is low, the defect of high energy consumption because a large amount of water vapor is brought away during the absorbing agent regeneration, and the invention belongs to an energy-saving formula with high green degree. The regeneration temperature of the solution is lower than that of the traditional absorbing liquid, the grade of a heat source required to be provided in the regeneration process is reduced, energy sources can be saved, the stability of the absorbing agent solution in the operation is high, the consumption of each absorption-desorption circulation is low, and in addition, the cost is low.

Description

technical field [0001] The invention relates to a reversibly absorbing CO 2 The formulation solution, specifically, is a formulation solution of a functionalized ionic liquid. technical background [0002] With the development of industrial society, the problem of air pollution has been widely concerned by people. Among them, carbon dioxide (CO 2 ) As the most important gas that causes the greenhouse effect, in the "Kyoto Protocol", controlling its emissions has become a legally binding obligation for all signatories. On the other hand, in the production of chemical industry, the decarbonization of natural gas is a very important link before its application. Various mixed gases such as synthesis gas and hydrogen energy preparation gas also contain various concentrations of CO which are harmful to the process. 2 , and its removal is an essential production process. Overall, CO 2 The removal of is of great significance in environmental protection, industrial production and...

AI Technical Summary

Problems solved by technology

However, since MDEA is a tertiary amine without active hydrogen, it absorbs CO 2 The rate is very slow, generally need to add a small amount of activators or accelerators such as piperazine, MEA, DEA, DIPA, imidazole, diethylenetriamine and other one or more components to form a formula solution

However, these activators or accelerators themselves have a certain vapor pressure. 2 During the process of absorption and analysis, volatilization will be lost, which will not only consume materials and absorption capacity, but also cause environmental pollution

[0006] (3) Due to the certain viscosity of traditional absorbents, they are often diluted with a large amount of water (mass content is about 40-50%). The water vapor brought out during the absorption process not only corrodes the equipment, but also requires additional steps to remove water. Increased operating costs; during the high temperature (100-150°C) desorption process, a large amount of latent heat is taken away due to the evaporation of water, resulting in high energy consumption in the process

However, although the synthesis and raw material costs of this type of ionic liquid are significantly lower than those of the above-mentioned amino-functionalized ionic liquids, they are still several times higher than that of organic amines, and there is still a considerable gap in the actual industrial process of using them directly as absorbents. Difficulties

Images