Process for treating methyl mercaptan smelly gas

A treatment method and technology of methyl mercaptan, which are applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve the problems of poor selectivity, secondary pollution of products, low cost, etc., and achieve mild reaction conditions and good treatment effect. , the effect of slow decomposition rate

Inactive Publication Date: 2013-03-27
OCEAN UNIV OF CHINA
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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 i

Method used

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  • Process for treating methyl mercaptan smelly gas
  • Process for treating methyl mercaptan smelly gas
  • Process for treating methyl mercaptan smelly gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The details are as follows: Prepare different concentrations of sodium persulfate (0 mol / L, 0.84×10 -3 mol / L, 2.52×10 -3 mol / L, 4.20×10 -3 mol / L, 5.88×10 -3 mol / L) of 500 mL of sodium hydroxide lye with a pH=12; the intake of air is maintained at 1.5 L / min, the intake of methyl mercaptan is maintained at 40 mL / min, and the concentration of methyl mercaptan gas after mixing is 80 ppm; the spray intensity is 120 mL / min; the concentration of methyl mercaptan in the water sample and the concentration of methyl mercaptan in the tail gas are sampled every 10 minutes, and the removal rate of methyl mercaptan in the whole system and the concentration of methyl mercaptan absorbed in the solution are calculated respectively. removal rate;

[0013] The concentration of methyl mercaptan in the tail gas is directly detected by a methyl mercaptan detector;

[0014] The methyl mercaptan in the solution is detected by spectrophotometry: the reaction between methyl mercaptan a...

Embodiment 2

[0024] Prepare 500mL of sodium hydroxide lye with pH=12 containing sodium peroxodisulfate or ammonium peroxodisulfate respectively, the concentration of sodium peroxodisulfate or ammonium peroxodisulfate is 4.2×10 -3 mol / L. The intake of air is kept at 1.5 L / min, the intake of methyl mercaptan is kept at 40 mL / min, the concentration of methyl mercaptan gas after mixing is 80 ppm; the spray intensity is 120 mL / min; water samples are taken every 10 minutes The concentration of methyl mercaptan in the medium was used to calculate the removal rate.

[0025] The result looks like this:

[0026] Table 2-1 Removal rate of methyl mercaptan in the system by different peroxodisulfates (%)

[0027] time (min)

[0028] The results show that the ammonium peroxodisulfate and sodium peroxodisulfate of the same concentration have a significantly better overall removal effect on methyl mercaptan in the system.

[0029] Table 2-2 The removal rate of absorbed methyl mercaptan by di...

Embodiment 3

[0033] Prepare 500mL of sodium hydroxide lye with pH=12 containing sodium peroxodisulfate, the concentration of sodium peroxodisulfate is 2.52×10 -3 mol / L. The intake of air is kept at 1.5 L / min, and the intake of methyl mercaptan is changed to maintain 20 mL / min, 30 mL / min, and 40 mL / min respectively. The concentration of methyl mercaptan gas after mixing is 40ppm, 60ppm, and 80 ppm; the spray intensity is 120 mL / min; the concentration of methyl mercaptan in the water sample is tested every 10 minutes, and the removal rate is calculated.

[0034] result:

[0035] Table 3-1. The removal rate of different concentrations of methyl mercaptan in the system under the condition of pH=12 by sodium peroxodisulfate (%)

[0036]

[0037] The results show that at 2.52×10 -3 mol / L of sodium peroxodisulfate, the removal rate of methyl mercaptan in the whole system increases with the decrease of the concentration.

[0038] Table 3-2. The removal rate of sodium peroxodisulfate to d...

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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...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/48
Inventor 杨世迎王雷雷冯琳玉赵腊娟赵思远吴文娟李润南王晶
Owner OCEAN UNIV OF CHINA
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