Abstract: In the process of enterprise production, the generation of exhaust gas is inevitable, and the exhaust gas treatment and the odor control are also being constantly researched and explored. Photocatalytic exhaust gas treatment technology can be completely decomposed industrial waste gas toxic and harmful substances. The general process of the exhaust gas treatment is that after the malodorous gas is input into the purification device by using the exhausting device, the purification device utilizes the high-energy UV ultraviolet light beam and the ozone to perform the synergistic decomposition oxidation reaction on the malodorous gas to transform the malodorous gaseous substance into the low molecular compound, And carbon dioxide, and then discharged through the exhaust pipe outdoors. After the decomposition of industrial waste gas, can completely achieve the harmless emissions, does not produce secondary pollution, while achieving efficient sterilization. Organic waste emissions from chemical production are characterized by a large quantity, volatile organic content, flammable, certain toxicity and some malodour, while the emissions of chlorofluorocarbons can also cause damage to the ozone layer. At present, the domestic treatment of organic waste gas absorption, adsorption, thermal decomposition, incineration and catalytic combustion, plasma technology, photo-catalytic technology. The choice of treatment depends on the chemical and physical properties of the exhaust gas, its concentration, its emissions, its emission standards, and the economic value of its recovery as a feedstock or by-product. Absorption, adsorption, incineration, photo-catalytic technology One, absorption method In the control of chemical waste organic pollution, the chemical absorption method used more, such as water absorption to naphthalene or o-xylene as raw materials, the production of phthalic anhydride containing anhydride, maleic anhydride, benzoic acid, naphthoquinone and other emissions; with water and alkali The solution absorbs the hypochlorinated tower tail gas (acid component) in the chlorohydrin process for the production of propylene oxide and the propane is recovered. Absorption of phenol-containing waste gas from sulfonation phenol production by alkali cycle method and recovery of phenol from acidified absorption liquid; absorption of synthetic resin plant containing formaldehyde by water. In addition, the use of lye in the production of pesticides and dyes also absorb H2S, SO2, Cl2 in the exhaust gas, water absorption of HCl, NH3 and other pollutants. The main problem with this technology is the need to address equipment corrosion. Second, adsorption method Adsorption method can be used to purify paint, paint, plastics, rubber and other chemical production emissions of solvents or organic waste, usually with activated carbon as adsorbent. Activated carbon adsorption is the most common method used to purify exhaust gases from the production of vinyl chloride and carbon tetrachloride. It is also widely used in coatings, paint production, painting and printing. L Currently, L is a regenerative technology for activated carbon which is not yet perfect and has a high processing cost. In some industries, sales of products due to poor quality of products recovered by desorption have been affected. Therefore, activated carbon adsorption method is only suitable for the treatment of some high concentrations of organic waste gas, organic matter or solvent recovery can be used back to production, so that treatment costs are compensated. Third, incineration Organic chemical waste gas production in the organic pollutants or odor substances can be used direct combustion or catalytic combustion method of governance. The combustion must be complete, otherwise the intermediate product formed during the incineration may be more dangerous than the original one. To make the combustion complete, you must have a good grasp of the three important parameters of combustion time, temperature and turbulence. Direct burning can be a torch or incinerator. Torch combustion method for the treatment of exhaust gas containing enough combustibles, exhaust gas calorific value needs to be above 1925kJ / m3, the torch is a normal pressure burner, the combustion efficiency is lower. Such as the use of boilers or industrial furnaces similar forced-air burner, the combustion effect is better than the torch. Direct combustion is usually carried out at about 1000 ℃, the complete combustion products are C02, N2 and water vapor. As the direct combustion method consumes more fuel, the domestic currently only deals with the treatment of flue gas with high calorific value, such as carbon black and acrylonitrile tail gas production, vinylon plant and solvent plant exhaust gas, etc., or in the case of low-cost fuel sources. Catalytic combustion is the use of solid catalyst, the exhaust gas at a relatively low temperature (200 ~ 500) incineration completely. At present, some domestic organic chemicals, enameled wire and paint manufacturers, the use of catalytic combustion of solvent-containing exhaust gas recovery of self-sufficiency. In addition, industrial-scale treatment and testing of benzene anhydride and cumene produced phenol phenol, acetone exhaust emissions. Stanford, photo-catalytic technology The general process of photo-catalytic oxidation of exhaust gas is that after the malodorous gas is input into the purification device by the exhausting device, the purification device uses the high-energy UV ultraviolet light beam and ozone to perform synergistic decomposition oxidation reaction on the malodorous gas so that the degradation of the malodorous gaseous substance is converted into low molecular weight Compounds, water and carbon dioxide, and then discharged through the exhaust duct outdoor.