Photocatalytic oxidation and molecular sieve absorption catalytic oxidation method for industrial waste gas VOCs

Abstract

The invention discloses a photocatalytic oxidation and molecular sieve absorption catalytic oxidation method for industrial waste gas VOCs. The method comprises the steps of waste gas pretreatment, carbon chain cutting, active oxygen preparation, first-time catalytic oxidization, molecular sieve adsorption and second-time catalytic oxidation. According to the method, the technology is simple and convenient to operate, the emission concentration of the organic waste gas VOCs and ozone can be significantly reduced, secondary pollution is avoided, the power of a photocatalytic oxidation technology is reduced, and energy sources are saved.

Description

technical field [0001] The invention relates to a method for photocatalytic oxidation of industrial waste gas VOCs and molecular sieve adsorption catalytic oxidation. Background technique [0002] In recent years, with the development of the economy, a large number of new chemical companies have led to the discharge of a large amount of industrial organic waste gas VOCs, which has degraded the quality of the atmospheric environment, seriously endangered human health, and caused huge losses to the national economy. Therefore, it is necessary to increase Treatment of organic waste gas VOCs. For the treatment of organic waste gas VOCs, thermal destruction method, condensation method, absorption method, biofilm method, photocatalytic oxidation method, plasma decomposition method, etc. are widely used at present. [0003] The photocatalytic oxidation treatment process of industrial organic waste gas VOCs has the advantages of less investment, high treatment efficiency, and low c...

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Problems solved by technology

[0003] The photocatalytic oxidation treatment process of industrial organic waste gas VOCs has the advantages of less investment, high treatment efficiency, and low cost; however, the photocatalytic oxidation process still has shortcomings: 1. Since the waste gas treatment is dynamic and continuous, the reaction time is short, Cause some incompletely reacted VOCs and ozone molecules to escape, exhaust gas, high ozone concentration or substandard emissions; 2. When the exhaust gas source fluctuates and the amount of VOCs in the organic waste gas generated instantaneously is too large, some VOCs will not be treated well. The exhaust gas concentration is high, or even exceeds the standard; 3. When the exhaust gas source fluctuates and the amount of organic waste gas VOCs generated in an instant is too small, the ozone generated by photocatalytic oxidation will be excessive, and the excess ozone will be discharged with the exhaust gas, which will cause secondary pollution ;4. In order to ensure that exhaust emissions meet the standards, the photocatalytic oxidation device generally considers increasing the margin when configuring the power, which will cause the device power to be too large and the operating cost of the equipment to increase