Desorption and regeneration method for organic matter adsorbent

Abstract

The invention discloses a desorption and regeneration method for an organic matter adsorbent. The method is characterized in that an organic matter adsorbent desorption and regeneration device of a microwave generator is arranged in a desorption tower; the to-be-desorbed adsorbent with organic matters is put in the desorption tower; steam is aerated from the top of the desorption tower; the microwave generator is started, wherein the microwave power is 500-10000W; desorption is carried out for 2-30 minutes; the desorbed organic matters and steam flow out from a steam outlet at the bottom of the desorption tower and enter a condenser for condensation; then the steam is cut off, nitrogen is aerated from the top of the desorption tower, and the nitrogen flows out from the bottom, wherein the microwave power is 200-2000W; drying treatment is carried out for 2-20 minutes; the microwave generator is turned off, and the nitrogen is cut off; the desorbed adsorbent is obtained. According to the method, the desorption rate is improved by a large margin by combining steam and the microwave technology, and less desorption residue is left.

Description

(1) Technical field [0001] The invention relates to a regeneration method of an organic pollutant adsorbent, especially aimed at the regeneration and desorption of organic molecules in activated carbon, molecular sieves and polymer resin adsorbents, and solves the current problem of adsorbent regeneration after adsorption of organic waste gas and organic waste water. (2) Background technology [0002] Adsorption technology is currently widely used in the treatment of organic waste gas and organic wastewater, especially for some low-concentration organic waste gas and wastewater. Adsorption can remove organic pollutants well and achieve the purpose of purification. In addition, through desorption and recycling, the resource utilization of organic pollutants can also be realized. At present, the most common adsorbents in the industry include activated carbon, activated carbon fiber, zeolite molecular sieve and polymer porous resin, etc., and these adsorbents all show good adso...

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Problems solved by technology

[0003] However, in industrial practice, water vapor regeneration technology also has several problems: (1) using the water vapor temperature to heat the adsorbent consumes a large amount of water vapor; Adsorbents such as resin and resin have small thermal conductivity, slow heat transfer rate, and long desorption time; (3) water molecules will remain in the adsorbent, and the adsorbent needs hot air to dry, which consumes a lot of energy; (4) desorption The product has a high water content, which makes subsequent storage and separation difficult

However, microwave treatment also has some limitations: (1) First, microwave treatment of media with high dielectric constant such as activated carbon is prone to local high temperature and sparks, which has serious safety hazards and will destroy the structure of the adsorbent; (2) Compared with Highly hydrophobic adsorbents (such as resins, highly hydrophobic zeolite molecular sieves) and non-polar adsorbates (benzene, toluene), due to the low dielectric constant, microwaves can hardly heat these media, so good desorption can not be achieved. with effect

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