Method for capturing and enriching carbon dioxide by using active material or modified active material and application thereof

Abstract

The invention discloses a method for capturing and enriching carbon dioxide by using an active material or a modified active material and an application thereof and belongs to the technical field of environmental protection. In order to absorb carbon dioxide in air efficiently for a long time, the invention provides the method for capturing and enriching carbon dioxide by using the active materialor the modified active material. The active material is ion exchange resin, a zeolite molecular sieve, activated aluminium oxide or activated carbon, and the modified active material is a modified zeolite molecular sieve, modified activated aluminium oxide or modified activated carbon. The method can be used for adsorbing carbon dioxide in air efficiently at a constant temperature and a constantpressure and desorbs the adsorbed carbon dioxide. The carbon dioxide can be also taken as a carbon dioxide gas fertilizer for promoting growth of organisms, including growth of microalgae. Carbon dioxide is fully utilized, and the carbon dioxide content in air is reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for capturing and enriching carbon dioxide in the air and its application. Background technique [0002] With the development of human society, the concentration of carbon dioxide in the air gradually rose from 280ppm in 1750 before the industrial revolution to 367ppm in 1999, and then rose rapidly to 379ppm in 2005. The rapid increase in carbon dioxide concentration has led to a severe greenhouse effect. How to reduce the concentration of carbon dioxide in the air and make full use of carbon dioxide is a hot spot in academia and industry. [0003] Since the concentration of carbon dioxide in the air is very low compared to the carbon dioxide in industrial waste gas and natural gas, industrial waste gas and natural gas pretreatment methods are not suitable for capturing and enriching it at normal temperature and pressure. Capturing and enri...

AI Technical Summary

Problems solved by technology

Rapid increase in carbon dioxide concentration leads to severe greenhouse effect

At present, there are not many feasible methods and technologies, mainly including: 1. Alkaline solution, although the process cost of absorbing carbon dioxide is low, but the cost of regeneration is high to desorb carbon dioxide; 2. Amine-modified oxide, although its adsorption capacity and stability 3. Amine-modified metal-organic framework materials. There are many reports on such materials, but they are expensive and have not been used for large-scale applications. 4. Low-temperature separation, using two-stage compression and condensation to liquefy or solidify carbon dioxide into dry ice, and then use distillation to separate carbon dioxide from liquefied or solidified impurities. This technology consumes a lot of energy and Need special equipment, not suitable for home application; 5. Membrane separation technology, this technology is still in the research stage, the cost is high, and it cannot be applied on a large scale for the time being

[0004] Generally speaking, the traditional method of capturing and enriching carbon dioxide in the air under normal temperature and pressure has obvious shortcomings, while the research and development of new materials and new methods are still in the development stage, and large-scale applications cannot be achieved in the short term.

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