Amine absorbent for removing sulfur dioxide in mixed gas

A technology of sulfur dioxide and absorbent, applied in the field of amine absorbent, can solve the problems of high energy consumption, easy oxidation, easy corrosion of solution, etc., and achieve the effects of low energy consumption, low corrosion, and high absorption capacity

Inactive Publication Date: 2016-01-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve problems such as the consumption of organic amine and the large energy consumption in the amine absorb...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Simulation of a factory flue gas outlet containing SO 2 2%, N 2 98% (both volume ratio), the absorbent composition is: main absorbent piperazine 2%, ethylenediamine 3%, first add 2% concentrated sulfuric acid, then add citric acid to adjust the pH value of the solution to about 6, add slow The etchant is 0.1% of mercaptobenzothiazole, and the rest is deionized water (the composition of the absorbent is all in mass ratio).

[0020] The whole absorption-regeneration process flow of the present embodiment is: preparing SO in the gas distribution tank 2 The content is 2%, N 2 98% of the simulated flue gas enters the bottom of the absorption tower and goes up the tower. At 40 ° C, the solution used in the present invention sprayed down from the top of the tower is in countercurrent contact with the filler. The purified gas after the acid gas is absorbed is released from the tower. Top vent. The rich liquid that has absorbed the acid gas is pumped into the regeneration to...

Embodiment 2

[0023] Simulation of a factory flue gas outlet containing SO 2 0.2%, N 2 99.8% (both volume ratio), the absorbent composition is: the main absorbent hydroxyethylpiperazine 2%, hydroxyethylethylenediamine 2%, first add 2% concentrated sulfuric acid, then add citric acid to adjust the pH of the solution 0.08% of benzotriazole as corrosion inhibitor, and deionized water as the rest (absorbent components are all in mass ratio).

[0024] SO in the purified gas after being treated by the absorption solvent of the present invention 2 Content3 , more than 80% of the sulfur dioxide in the rich solution can be regenerated, and the solution corrosion rate is only 0.018g / (m 2 h), the corrosion inhibition effect is over 99%, and the desorbed SO 2 By-product concentration greater than 99%. Experimental results show that using this desulfurization solvent, the corrosion inhibition efficiency is significantly improved compared with other methods.

Embodiment 3

[0026] Simulation of a factory flue gas outlet containing SO 2 0.2%, air 99.8% (both volume ratio), the absorbent composition is: the main absorbent hydroxyethylpiperazine 2%, ethylenediamine 2%, first add 2% concentrated sulfuric acid, then add citric acid to adjust the pH of the solution Adjust to about 6, add 0.1% compound antioxidant, that is, antioxidant 618, the chemical name is bis(octadecyl) pentaerythritol diphosphite and antioxidant 168, the chemical name is three (2,4 - Di-tert-butylphenyl) phosphite, adding 0.1% of mercaptobenzothiazole as a corrosion inhibitor, and the rest as deionized water (absorbent compositions are all in mass ratio).

[0027] SO in the purified gas after being treated by the absorption solvent of the present invention 2 Content3 , more than 80% of the sulfur dioxide in the rich solution can be regenerated, and the corrosion rate of the solution is only 0.022g / (m 2 h), the corrosion inhibition effect is over 98%, the anti-oxidative degradat...

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Abstract

The invention belongs to the field of gas purification. Aiming at the characteristics of tail gas discharged by a sulfuric acid production plant, a smelting plant, a phosphate fertilizer plant, an iron and steel plant, a thermal power plant and the like, an amine absorbent for removing sulfur dioxide in mixed gas is developed. The amine absorbent is characterized in that (1) the absorbent contains one or more reproducible organic amine; (2) the absorbent contains one or more organic amine additives; (3) the absorbent contains 50-95% by mass of water; (4) the absorbent contains 0.05-0.5% by mass of a phosphite ester antioxidant; (5) the absorbent contains 0.05-0.1% by mass of nitrogen-containing, sulfur-containing or hydroxyl-containing organic compounds which have surface activity as a corrosion inhibitor; and (6) the absorbent absorbs SO2 gas in mixed gas at a low temperature ranging from 20 DEG C to 60 DEG C and desorbs the SO2 gas at a high temperature ranging from 90 DEG C to 130 DEG C, and a solution after desorption can be repeatedly used. The absorbent provided by the invention can purify sulfur dioxide in raw material gas from 400-40000 mg/m3 to below 20 mg/m3, and the concentration of a desorbed SO2 byproduct is greater than 99%.

Description

technical field [0001] The invention relates to an amine absorbent for removing sulfur dioxide in mixed gas, belonging to the fields of material chemistry, gas separation or purification, and the like. The desulfurizer will show good application prospects in chemical engineering, material modification, waste water treatment, oil extraction, gas purification or separation and other chemical fields. Background technique [0002] Atmospheric SO 2 Most of the emissions come from the burning of fossil fuels. SO released from coal combustion 2 accounts for two-thirds of total emissions, so during coal combustion, SO 2 Control is a very important issue in the energy industry. This part SO 2 If not removed, it will be discharged directly into the air causing pollution. If the emission in a local area is too large, and the adjustment ability of the atmosphere itself cannot fully digest it, then part of the SO 2 and its oxidation product SO 3 Falling with the rainfall, acid ra...

Claims

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Application Information

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IPC IPC(8): B01D53/14
Inventor 毛松柏陈曦
Owner CHINA PETROLEUM & CHEM CORP
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