Process for adsorbing, desorbing and catalytically oxidizing VOCs by using activated carbon in pharmaceutical industry

Abstract

The invention discloses a process for adsorbing, desorbing and catalytically oxidizing VOCs by using activated carbon in the pharmaceutical industry. An alkaline washing tower group, an activated carbon group, a catalytic oxidation device and a fan are included; the activated carbon group comprises a first activated carbon box, a second activated carbon box and a third activated carbon box, the upper part of the activated carbon group is connected with the inlet pipeline, the lower part is connected with the gas outlet pipeline, and the activated carbon group is connected with the catalytic oxidation device through a branch pipeline to form an annular loop; a catalyst is arranged in the catalytic oxidation device, porous thin-wall honeycomb ceramic is used as a carrier of the catalyst, and a layer of nano activated aluminum oxide and a layer of Pt metal modified nanoscale material H2Pt(OH)6 are sequentially loaded on the surface of the catalyst; the volume of the catalytic oxidation reactor can be reduced, and the manufacturing cost is reduced; the energy of the high-temperature gas subjected to catalytic oxidation is utilized twice, so that the operation cost of the device is reduced; and the halogenated compound is completely converted through catalytic oxidation, so that the activated carbon is completely desorbed, and the safety of the device is guaranteed.

Description

technical field [0001] The invention relates to the field of waste gas treatment, in particular to a process for activated carbon adsorption and desorption catalytic oxidation of VOCs in the pharmaceutical industry. Background technique [0002] Halogenated organic substances commonly used in the pharmaceutical industry are: dichloromethane, chloroform, trichloroethylene, acetyl chloride, dichloroethane and its bromide, etc. Usually, the tail gas emissions contain a mixture of hydrogen chloride and various organic substances, and Emission concentrations fluctuate with changes in the pharmaceutical process. In the traditional pharmaceutical industry, VOCs treatment methods include adsorption and regenerative incineration (RTO). Since most pharmaceutical devices operate intermittently, the concentration of VOCs in the exhaust gas is relatively high, and contains a large amount of halogenated organic compounds. Both of these two treatment methods have certain defects. The dis...

AI Technical Summary

Problems solved by technology

The disadvantages of the adsorption method are: 1. It is not suitable for high-concentration and high-temperature organic waste gas, and the adsorption material needs to be replaced regularly; 2. The waste activated carbon that adsorbs VOCs is hazardous waste, and it is difficult to treat

The disadvantages of the RTO method are: 1. The halogenated organic matter needs to be separated and processed separately, but because it cannot be completely separated (even if there is a small amount), the dioxin after combustion will exceed the standard; 2. The RTO method The weight of the device is large, the volume of the device is large, the investment and operating costs are high, and the requirements for the fire distance are relatively high; 3. Since the start-up of this method requires a long heating time, the device is required to operate as continuously as possible

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