Method for trapping CO2 by using double tube micro-reactor

Abstract

The invention relates to a method for trapping carbon dioxide (CO2) by using a double tube micro-reactor. The method comprises the following steps of: introducing CO2-containing mixed gas into an inner tube of the micro-reactor, wherein the pressure intensity at a gas inlet is 0.1 to 5MPa and the gas-phase linear velocity is 1.0 to 20.0m / s; injecting absorption liquid into an outer tube of the micro-reactor and keeping liquid-phase linear velocity within a range of between 0.01 and 1m / s to form a stable annular liquid membrane; allowing the gas to burst out from a micro-channel of the inner tube, dispersing the gas phase into micron-scale small bubbles and allowing the small bubble to collide the liquid membrane which has micron-scale thickness and is formed in the outer tube on a microporous part of the micro-reactor by cross flow; and allowing the gas and the liquid to flow into the annular micro-channel of the micro-reactor in parallel to finish a micro mass transfer absorption process. The method can greatly enhance the gas-liquid mass transfer process of which the reaction is controlled by the liquid membrane, and obviously improve the CO2 absorption rate; and the processing load is increased by scores of times compared with that of a single-channel micro-reactor. The method has a simple process and is low in cost.

Description

Technical field: [0001] The present invention relates to the capture of CO 2 method, especially a method for capturing CO using a jacketed microreactor 2 Methods. It can be used for gas purification and greenhouse gas emission reduction. Background technique: [0002] carbon dioxide (CO 2 ) emissions are the main cause of the greenhouse effect, so CO 2 Emission reduction and resource utilization have become the focus of energy conservation and emission reduction in countries all over the world. CO 2 The capture of CO is a prerequisite for its utilization and burial, while the low-cost CO 2 It is quite difficult to capture large quantities. Absorb CO 2 There are many methods, but no matter what method is used to decarbonize, the mass transfer efficiency of the decarbonization process directly affects the CO 2 Circulation of absorption liquid and CO in purified gas 2 content, which also affects the cost of decarbonization. The absorption rate of decarbonization is h...

AI Technical Summary

Problems solved by technology

There is a kind of microchannel reactor reported in the literature, which is a tubular single channel structure (Y type or T type single channel microreactor), which can be used for liquid-liquid or gas-liquid mass transfer process, but the gas of this kind of reactor -The liquid mass transfer enhancement process is only realized by using micronized reactor size, which is suitable for CO 2 There is still room for improvement in the enhancement of mass transfer processes controlled by trapping such liquid films

Moreover, the single microchannel structure also limits the processing capacity, which is not suitable for large-capacity industrial mass transfer processes, such as CO in industrial tail gas. 2 Discharge treatment

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