A preparation method of composite decarburization liquid suitable for low-pressure and low-heat working conditions

Abstract

The invention discloses a method for preparing a composite decarburization liquid suitable for low-pressure and low-heat working conditions, comprising the following steps: (1) adding polymethyl methacrylate and an aqueous nitrate solution to an ethanol aqueous solution, stirring and dissolving, and then filtering, The solid substance is dried and calcined to form a calcined powder; (2) the chitosan powder is dissolved in an aqueous acetic acid solution to form a chitosan solution, and glutaraldehyde and sulfuric acid are added to form a polymerization raw material solution; (3) the calcined powder is Immerse in the polymerization raw material solution and stir, filter, dry and heat to obtain micron-sized composite particles; (4) add inorganic alkali solution, sodium borohydride or sodium dodecyl sulfonate or pentahydrate to the alcohol amine aqueous solution Ethylene hexamine or a mixture of two or more of the above substances and nano-composite particles are stirred to obtain a decarburization solution. The decarburization liquid prepared by the invention can greatly improve the carbon dioxide mass transfer rate in the absorption process and the desorption process.

Description

technical field [0001] The invention relates to a method for preparing a composite decarburization liquid suitable for low-pressure and low-heat working conditions, and belongs to the technical field. Background technique [0002] Purifying biogas rich in methane and carbon dioxide such as biogas and landfill gas into bionatural gas is an important way to convert and utilize biomass gas with high value and reduce pollution emissions, especially greenhouse gas emissions. The main part of the process is the decarbonization of biomass gas to remove carbon dioxide. At present, there are many methods to achieve this decarbonization of biomass gas, including organic amine absorption method, pressure swing adsorption method, membrane separation method, high-pressure water washing method, etc. Among them, the organic amine absorption method has the ability to remove carbon dioxide The advantages of high efficiency and low methane loss have been widely used. [0003] The organic am...

AI Technical Summary

Problems solved by technology

Although this method has the above-mentioned advantages, there are still problems of high absorption pressure and high desorption temperature in application at present. Usually, the absorption pressure is 5 kg or more, and the desorption temperature is above 100 ° C. In terms of gas pressure, a large gas compression energy consumption is generated, and at the same time, steam at a higher temperature is provided as a desorption heat source during the desorption process, resulting in a relatively large desorption heat consumption, which has an adverse effect on reducing the operating cost of the biomass gas purification process

Images