Process for treating methyl mercaptan smelly gas

Abstract

The invention relates to a process for treating a methyl mercaptan smelly gas continuously as per an oxidation method through chemical absorption. More specifically, on the reaction conditions of the normal pressure and the normal temperature, an alkali liquid with the pH higher than 12 is used for absorbing the methyl mercaptan smelly gas, and simultaneously, peroxydisulfate is used for oxidizing removal. The process has the advantages that the methyl mercaptan smelly gas which is hard to dissolve and process in a smelly gas is processed by the aid of the advantages of absorption and oxidizing removal of the alkali liquid, methyl mercaptan can be oxidized fully and is not shifted, the peroxydisulfate in the solution is decomposed in the alkali liquid, the decomposition rate is very slow, no secondary pollution is produced, a reaction system can keep continuous air suction and can be recycled continuously, reactions are conducted on the reaction conditions of the normal pressure and the normal temperature, reaction conditions are mild, the operation is simple, and the processing effect is good.

Description

technical field [0001] The invention belongs to the technical field of malodorous gas treatment, and in particular relates to a treatment method for removing the odor of methyl mercaptan, in particular to a method for continuously treating the odor of methyl mercaptan by chemical absorption and oxidation. Background technique [0002] With the development of society, waste water treatment plants, paper mills, petrochemical plants, fertilizer plants, rubber plants, tanneries, pesticide plants, livestock and poultry farms and public facilities produce a large amount of foul gas, which has a great impact on the surrounding environment. People's attention to malodorous gas is also increasing day by day. The composition of malodorous gas is relatively complex, consisting of sulfides, nitrogen compounds and some volatile organic compounds. Methyl mercaptan gas is one of the main odorous gases, which mainly comes from kraft pulp, oil refining, gas, pharmaceuticals, pesticides, synt...

AI Technical Summary

Problems solved by technology

The physical process mainly includes condensation, activated carbon adsorption and water absorption, etc. It can deal with most odor pollutants, and has strong adaptability to a large amount of odor; generally, the equipment required is relatively large, and only the transfer of odor occurs, but not completely removed , it is necessary to carry out follow-up treatment of the adsorbed or absorbed odor, and the cost of treatment and equipment replacement is high; the biological process includes biofilter and bioabsorption, etc., the cost is low, the treatment effect is good, the disadvantage is that the selectivity is high, Rapid changes in the concentration of odor, gas composition, and gas flow rate can easily cause the instability of the bioreactor, resulting in the failure of microorganisms; the reaction product is mainly acid, which needs to be washed frequently to maintain a neutral environment in the biofilter. Secondary treatment is required; the chemical process mainly includes wet chemical absorption, thermal oxidation, catalytic oxidation, ozonation, etc. Generally speaking, the selectivity is poor, and it is only suitable for the treatment of part of the odor. The reaction process is cumbersome and sometimes requires several steps to After completion, the processed product is prone to secondary pollution; for some chemical processes that require high temperature, sulfur dioxide is produced and discharged into the air, which is easy to form acid rain. In comparison, chemical absorption is the most widely used to remove odor, and the treatment effect is better , is the most practical and effective odor treatment method

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