Non-aqueous solvent carbon dioxide capture liquid, method and system

Abstract

The invention provides a non-aqueous solvent carbon dioxide capture liquid, method and system and belongs to the field of carbon dioxide recovery. The non-aqueous solvent carbon dioxide capture liquid is prepared from, by weight, 60-80% of organic solvent and 20-40% of composite organic amine. The organic solvent comprises low alcohol and / or ethanediol. The composite organic amine comprises hindrance amine and active amine. The weight ratio of active amine to hindrance amine is (0.4-70):1. Hindrance amine contains primary amine or at least one piece of secondary amine, secondary amine is connected with secondary carbon atoms or tertiary carbon atoms, and primary amine is directly connected with the tertiary carbon atoms. Active amine comprises primary amine or secondary amine. The non-aqueous solvent carbon dioxide capture liquid has relatively low carbon dioxide desorption temperature and relatively low solvent specific heat capacity and latent heat of evaporation, therefore, energy consumption in the desorption process is effectively reduced, and the comprehensive capture cost of carbon dioxide is reduced.

Description

technical field [0001] The invention relates to the field of carbon dioxide recovery, in particular to a non-aqueous solvent carbon dioxide capture liquid, a method and a system. Background technique [0002] Among all greenhouse gases, CO 2 It accounts for about 94% of the total greenhouse gas emissions, and its contribution to the greenhouse effect exceeds 60%. 2 A series of problems such as global warming and frequent extreme weather caused by massive emissions have attracted widespread attention from the international community. So how to the CO 2 Efficient capture and utilization to reduce emissions is a problem that researchers around the world are committed to solving. [0003] At present, the chemical absorption method is the most mature technology and the most widely used CO 2 Among them, the organic amine absorption method has become a widely used mainstream technology due to its fast absorption rate, large absorption capacity, good absorption effect, and high ...

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Problems solved by technology

The heat-absorbing evaporation and low-temperature condensation of water consume a lot of energy, resulting in relatively high energy consumption for regeneration, and the high-temperature environment also leads to a series of problems such as degradation of absorbents and equipment corrosion.

As crude oil prices continue to slump, petrochemical companies 2 The new capture technology puts forward higher requirements in terms of environmental protection and energy saving. The high regeneration energy consumption of the existing technology has become a bottleneck restricting the wide and continuous application of the organic amine absorption method. How to further reduce the regeneration energy consumption is the focus of research in this field

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