Anhydrous CO2 (carbon dioxide) phase change absorbent with low energy consumption and regeneration method and application thereof

Abstract

The invention discloses an anhydrous CO2 (carbon dioxide) phase change absorbent with low energy consumption and a regeneration method and application thereof. The anhydrous CO2 phase change absorbentadopts unique diamine with primary amine (NH2-) and tertiary amine (-N-), and is free from organic solvent, water and ionic liquid, and the nitrogen atom of the tertiary amine is linked with two alkyl branched chains to form certain hydrophobicity; after the diamine absorbs CO2, the liquid phase is changed into the solid phase, the liquid and solid phase change is generated, and a white carbamatecrystal is formed; because the anhydrous CO2 phase change absorbent is an anhydrous unique absorbent, the potential heat of a solvent in the regeneration process is effectively reduced, the CO2 enriching phase separating process is reduced, and the energy consumption is decreased; the heat decomposing temperature is low, and the anhydrous CO2 phase change absorbent can be regenerated by heating.The regeneration method specifically comprises the following steps of (1) sampling under the sealing environment; (2) phase-change regeneration; (3) regeneration calculation; (4) phase change absorption; (5) absorption calculation; (6) circulating implementing. The anhydrous CO2 phase change absorbent is used for recycling the CO2 in chemical engineering reaction tail gas and combustion flue gas,and removing the CO2 in urban coal gas and natural gas.

Description

technical field [0001] The invention relates to the technical field of carbon dioxide capture, separation and recovery, in particular to a low-energy anhydrous CO 2 Phase change absorbent and its regeneration method and application. Background technique [0002] Carbon dioxide (CO2) from coal-fired power plants and other industrial 2 ) emissions as the most important man-made greenhouse gas (Greenhouse Gas, GHG) has attracted worldwide attention. Atmospheric CO 2 One of the environmental impacts of accumulation is global warming, leading to climate issues such as melting polar regions, rising sea levels and more severe weather patterns. It is generally accepted that there is an immediate need to reduce CO2 from coal combustion before more efficient technologies or other renewable energy sources can replace fossil fuels. 2 emission. At the 2009 Copenhagen World Climate Conference, the Chinese government promised that by 2020, the CO emitted per unit of gross domestic pro...

AI Technical Summary

Problems solved by technology

These absorbents have been greatly improved compared with the previous single-component absorbents, but there are still many problems in terms of absorption capacity, absorption rate and energy consumption, such as: complicated separation process, high cost of ionic liquid, high viscosity, regeneration process, etc. Complex, high energy consumption, high toxicity, difficult to be widely used in industrial processes, etc.

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