Method for preparing alkali sulphide by using sulfur dye waste gas

A technology of sulfur dyes and alkali sulfide, applied in the direction of alkali metal sulfides/polysulfides, which can solve problems such as human injury and atmospheric environmental pollution, and achieve the effects of less energy consumption, reduced environmental pollution, and convenient operation

Inactive Publication Date: 2010-02-24
蔡瑞琳 +2
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] In addition, a small amount of such exhaust gas can also be directly discharged at high altitude, but this method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The method for preparing soda sulfide from sulfur dye waste gas, which uses sulfur dye waste gas containing hydrogen sulfide as raw material and makes it enter the bottom of the absorption tower, and feeds it into the tower from the top of the absorption tower through a circulation pump with a flow rate of 150m 3 The sodium hydroxide solution (its weight percentage concentration is 10%) of / h reacts, and the weight ratio of the add-on of sodium hydroxide solution and waste gas is 0.8: 1, and reaction temperature is 60 ℃, absorbs by induced draft fan in the reaction process Exhaust outside the tower (the gas includes some trace gases and water vapor generated during the reaction), and the air volume of the induced draft fan is 11300Nm 3 / h, so that the pressure in the reaction process is-0.12MPa, when the weight percentage concentration of the sodium hydroxide solution at the bottom of the absorption tower is less than 1%, then react to the end, then the reaction solution...

Embodiment 2

[0022] The method for preparing alkali sulfide from sulfur dye waste gas, which uses sulfur dye waste gas containing hydrogen sulfide as raw material and makes it enter the bottom of the absorption tower, and feeds it into the tower from the top of the absorption tower through a circulation pump with a flow rate of 200m 3 The potassium hydroxide solution (its weight percent concentration is 15%) of / h reacts, and the weight ratio of the add-on of potassium hydroxide solution and waste gas is 1: 1, and reaction temperature is 66 ℃, absorbs by induced draft fan in the reaction process Exhaust outside the tower (the gas includes some trace gases and water vapor generated during the reaction), and the air volume of the induced draft fan is 10500Nm 3 / h, so that the pressure in the reaction process is-0.105 MPa, when the concentration by weight of the potassium hydroxide solution at the bottom of the absorption tower is less than 1%, then react to the end, then the reaction solution...

Embodiment 3

[0026] The method for preparing alkali sulfide from sulfur dye waste gas, which uses sulfur dye waste gas containing hydrogen sulfide as raw material and makes it enter the bottom of the absorption tower, and feeds it into the tower from the top of the absorption tower through a circulation pump with a flow rate of 250m 3 The sodium carbonate solution (its weight percentage concentration is 20%) of / h reacts, and the weight ratio of the add-on of sodium carbonate solution and waste gas is 1.2: 1, and temperature of reaction is 72 ℃, by induced draft fan in the reaction process to the outside of absorption tower Exhaust (the gas includes some trace gases and water vapor, CO produced in the reaction process 2 ), the air volume of the induced draft fan is 7700Nm 3 / h, so that the pressure in the reaction process is-0.09MPa, when the weight percent concentration of the sodium carbonate solution at the bottom of the absorption tower is less than 1%, then react to the end, then the ...

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Abstract

The invention discloses a method for preparing alkali sulphide by using sulfur dye waste gas, which is characterized in that the sulfur dye waste gas containing hydrogen sulfide is used as a raw material and added with alkali to perform reaction at the reaction temperature of between 60 and 85 DEG C, the reaction products are cooled to between 30 and 50 DEG C after the reaction reaches a final point, and the reaction products are filtered to form the alkali sulphide. The alkali added into the sulfur dye waste gas containing the hydrogen sulfide may be one or a mixture of more than two of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate and potassium carbonate, and the ratio of the adding amount of the alkali to the weight of the waste gas is (0.8-1.4): 1. The pressure in the reaction process is -0.12 to -0.06MPa. The alkali sulphide is sodium sulphide and potassium sulfide. The method changes waste into valuable, effectively solves the problem that the sulfurdye waste gas is difficult to treat, reduces the discharge concentration of hydrogen sulfide in the waste gas, achieves the aims of environmental protection, energy conservation and discharge reduction, substance recycle and clean production, has large economic benefit and social benefit, and has the advantages of effectively reducing environment pollution and having less energy consumption.

Description

technical field [0001] The invention relates to a method for preparing alkali sulfide from sulfur dye waste gas, which belongs to the technical field of comprehensive treatment of by-products of chemical dyes and chemicals. Background technique [0002] The waste gas produced in the production process of sulfur dyes is mainly hydrogen sulfide, which is an extremely unpleasant sour gas. At present, such waste gas is mostly purified by the Claus method to recover and produce sulfur, and this method needs to consume more energy. The method is to oxidize part of the hydrogen sulfide in the waste gas in the Claus combustion furnace to generate sulfur dioxide, and then the sulfur dioxide reacts with the remaining hydrogen sulfide to generate sulfur. The relevant main chemical reaction formula is: [0003] h 2 S+3 / 2O 2 = SO 2 +H 2 O, [0004] 2H 2 S+SO 2 =2H 2 O+3 / 2S 2 [0005] In addition, a small amount of such waste gas can also be directly discharged at high altitude...

Claims

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Application Information

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IPC IPC(8): C01B17/22
Inventor 蔡瑞琳邱勇杨宝德
Owner 蔡瑞琳
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