Technology for recovering and processing organic exhaust gas by activated carbon adsorption and N2 desorption

Abstract

The invention provides a technology for recovering and processing organic exhaust gas by activated carbon adsorption and N2 desorption. The technology comprises the following steps: organic exhaust gas is pretreated by a coil-cooling filter; the organic exhaust gas which has been pretreated is then sent into a first activated carbon adsorption tank for adsorption; after adsorption of the first activated carbon adsorption tank, the system enters a desorption stage, and a second activated carbon adsorption tank enters an adsorption stage; the desorbed organic exhaust gas is condensed and then recovered, and after desorption of the system, the first activated carbon adsorption tank is cooled to a certain temperature, and back-purging is conducted on the first activated carbon adsorption tank, and the temperature drops to normal temperature after back-purging so as to use the exhaust gas in the next circulation; and the first activated carbon adsorption tank and the second activated carbon adsorption tank recycle and alternate the above steps. By the adoption of the technology, secondary pollution will not be caused; energy consumption is low; and the quality of recovered organic solvents is pure.

Description

【Technical field】 [0001] The invention relates to an activated carbon adsorption, N 2 The process of desorption recovery and treatment of organic waste gas. 【Background technique】 [0002] VOCs are a class of volatile organic compounds with a boiling point of 50°C to 260°C and a saturated vapor pressure of more than 133.3Pa at room temperature, which are very harmful to human health and the ecological environment. How to effectively recycle and treat this kind of organic waste gas can not only avoid environmental pollution, but also turn waste into treasure, reduce the investment cost of enterprises, and achieve a win-win situation of social and economic benefits. [0003] At present, the most widely used method of organic solvent recovery is still based on "activated carbon adsorption-water vapor desorption-condensation recovery". However, there are many problems in practical application of this method. In recent years, an organic waste gas recovery method using nitrogen ...

AI Technical Summary

Problems solved by technology

[0005] Because VOCs gas has a low boiling point and is volatile, the saturated vapor pressure exceeds 133.3Pa at room temperature, which requires a large investment in heat exchange equipment and high energy consumption, and the condensed gas still contains a relatively high concentration of organic waste gas

The existing technology mainly uses a large-area heat exchanger to condense, and adds a secondary adsorption device at the end of the desorption condensation recovery to absorb and treat the condensed gas, which not only makes the process more complicated and difficult to control, but also increases business investment cost

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