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Method for cleansing exhaust gas of sulfureted hydrogen in low concentration

A hydrogen sulfide, low-concentration technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of difficult to control side reactions, difficult to fully regenerate, and complex composition of washing liquid, saving resources. , Taking into account the effect of recycling and low cost

Inactive Publication Date: 2007-12-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of toxic washing liquid, the arsenic-based process is no longer used due to the restriction of environmental protection regulations; the oxidation speed of ADA method is too slow, and the side reaction is large
The more promising technology is the iron-based technology, but there are still problems in the solution stability, side reaction control and regeneration of this kind of method. Although it can be made up by adding various additives to the solution, the composition of the lotion It is complicated and makes it difficult to control the side reactions well, and it is not easy to regenerate completely

Method used

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  • Method for cleansing exhaust gas of sulfureted hydrogen in low concentration

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Absorption solution: Weigh 1.62 grams of FeCl 3 and 0.72 g of 50% Mn(NO 3 ) 2 solution (element molar ratio Mn:Fe=0.2), dissolved together in 200mL deionized water, fully stirred and dissolved to make Fe 3+ Concentration is the composite ion absorption liquid of 0.05mol / L; Add 2.92 grams of EDTA and 2.18 grams of sulfosalicylic acid as stabilizer (metal ion Fe 3+ and the total molar ratio of the stabilizer is 1:2); with NaCO 3 Adjust the pH value of the solution to 9 to obtain a composite ion absorption solution.

[0029] Pour the prepared absorption solution into the impingement flow reactor, the reaction temperature is controlled at 60-70°C, and the hydrogen sulfide content in the hydrogen sulfide waste gas entering from the reactor inlet is 750mg / m 3 (The volume percent concentration is below 0.1%), the gas flow rate is 200mL / min; the oxygen content volume percent is 10%.

[0030] Purification effect: Under this condition, the purification efficiency of the abso...

Embodiment 2

[0032] Absorption solution: Weigh 1.95 grams of FeCl 3 and 0.69 g of Mn(CH 3 COO) 2 Dissolve in 200mL deionized water (element molar ratio Mn:Fe=0.3), fully stir and dissolve to make Fe 3+ Concentration is the composite ion absorption liquid of 0.06mol / L; Add 13.1 grams of sulfosalicylic acid as stabilizer (metal ion Fe 3+ and the total molar ratio of the stabilizer is 1:5); with NaHCO 3 Adjust the pH of the solution to 8.

[0033] Reaction conditions: Pour the prepared absorption liquid into the impingement flow reactor, and control the reaction temperature at 70-80°C; the hydrogen sulfide content in the hydrogen sulfide waste gas entering from the reactor inlet is 1000mg / m 3 (The volume percent concentration is below 0.1%), the gas flow rate is 200mL / min; the oxygen content volume percent is 15%.

[0034] Purification effect:

[0035] temperature, ℃

Embodiment 3

[0037] Absorption solution: Weigh 1.62 grams of FeCl 3 and 0.87 g of Mn(CH 3 COO) 2 Dissolve in 200mL deionized water (element molar ratio Mn:Fe=0.5), fully stir and dissolve to make Fe 3+ Concentration is the solution of 0.05mol / L; Add 4.36 grams of sulfosalicylic acid and 5.84 grams of EDTA as stabilizer (metal ion Fe 3+ and the total molar ratio of the stabilizer is 1:4); with NaCO 3 and NaHCO 3 Each accounts for 50% to adjust the pH value of the solution to 10.

[0038] Reaction conditions: Pour the prepared absorption liquid into the impingement flow reactor, and control the reaction temperature at 50-60°C; the hydrogen sulfide content in the hydrogen sulfide waste gas entering from the reactor inlet is 1000mg / m 3 , gas flow rate 300mL / min; oxygen content volume percentage 15%.

[0039] Continue the reaction until the purification efficiency drops to 70%, take out the absorption liquid and filter it, and regenerate the filtrate with oxygen drum, adjust the pH value ...

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Abstract

The invention relates to a purification method of low concentration hydrogen sulfide waste gas, adds a sort of Mn (NO3)2 and Mn (CH3COO) 2 into the FeCl3 solution which contains Fe3+, evenly stirring, adds a or several kinds of ethylenediamine tetraacetic acid, sulfosalicylic acid, citric acid as the metal ion stabilizer, adjusting the solution pH value to 8-10 with Na2CO3 and NaHCO3, getting the complex ion absorption solution. Joins the complex ion absorption solution and the low thickness sulfureted hydrogen into the impact flow reactor and control the response temperature in 50-80deg.c, the oxygen content volume in the waste gas is 0.5-20%, carries on the absorption purification response to reduce the purification efficiency to lower than 70%, takes out the absorption solution and filters, the filtrate carries on the drum oxygen regeneration, the hydrogen sulfide purification efficiency may maintains above 95% in the long time. The invention is the purification method which is able to treat the hydrogen sulfide waste gas whose volume percentage concentration is below than 0.1%, with the absorption solution recycle, and high absorption purification efficiency.

Description

1. Technical field [0001] The invention relates to a method for liquid-phase catalytic oxidation of low-concentration hydrogen sulfide waste gas, which belongs to the technical field of catalytic technology applied to air pollution purification. 2. Technical background [0002] Natural gas, coke oven gas, coal gas, petroleum cracking gas and other gases all contain a certain amount of hydrogen sulfide and organic sulfur compounds. Sulphides in raw gas can poison catalysts of chemical reactions, corrode equipment and pipelines, and affect product quality; sulfur-containing combustion products and industrial device relaxation gases discharged into the atmosphere will endanger human health and pollute the environment. With the increasingly stringent environmental requirements, more stringent requirements have been put forward for the concentration of sulfide in the exhaust gas, and the problem of hydrogen sulfide purification in industrial waste gas has become increasingly prom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/52
Inventor 易红宏唐晓龙宁平
Owner KUNMING UNIV OF SCI & TECH
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