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Absorbing agent for removing and recovering sulfur dioxide from gaseous mixture

A sulfur dioxide and absorbent technology, which is applied in the direction of inorganic chemistry, sulfur compounds, chemical instruments and methods, etc., can solve the problems of waste residue pollution, ammonia escape, ammonia nitrogen pollution, etc., and achieves a small footprint, low operating cost, and low investment. Effect

Active Publication Date: 2008-10-01
HUAXI CHEM INST CHENGDU CITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above methods, in governance SO 2 At the same time as pollution, due to problems such as by-product gypsum having no market and ammonia escape, it will also bring waste residue pollution, ammonia nitrogen pollution, and increase CO 2 Environmental issues such as emissions are inconsistent with my country's sustainable development strategy

Method used

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  • Absorbing agent for removing and recovering sulfur dioxide from gaseous mixture
  • Absorbing agent for removing and recovering sulfur dioxide from gaseous mixture

Examples

Experimental program
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Embodiment 1

[0020] Sintering flue gas of a large iron and steel company, SO in the gas 2 The content is 3500~11000mg / Nm 3 , the temperature is 130°C, the pressure is -5Pa, and the process flow shown in Figure 1 is adopted:

[0021] After the flue gas is pressurized by the fan (1), it enters the water washing tower (2) to remove dust and cool down, and then sends it to the absorption tower (3). 2 Absorbed by the absorbent, the outlet gas is emptied. Absorb SO 2 The final rich liquid enters the poor-rich liquid heat exchanger (5) from the bottom of the tower through the pump (4), and enters the upper part of the regeneration tower (6) after recovering heat. Desorbed SO 2 After being cooled by condenser (10) together with water vapor, separate and remove moisture, obtain the product SO of purity 99.5% 2 Gas, sent to the next section for use. The condensed water separated from the regeneration gas is sent to the top of the regeneration tower by the pump (12). The rich liquid enters fro...

Embodiment 2

[0026] SO in conversion gas of a sulfuric acid plant 2 The content is 12-14%, the temperature is normal temperature, and the pressure is 4kPa. The process flow shown in Figure 2 is adopted:

[0027] The reformed gas first enters the absorption tower (1), and the SO in the flue gas 2 Absorbed by the absorbent, the outlet gas is emptied. Absorb SO 2 The final rich liquid enters the poor-rich liquid heat exchanger (3) from the bottom of the tower through the pump (2), and enters the upper part of the regeneration tower (4) after recovering heat. Desorbed SO 2 After being cooled by condenser (8) together with water vapor, separate and remove moisture, obtain the product SO of purity 99.5% 2 Gas, sent to the next section for use. The condensed water separated from the regeneration gas is sent to the top of the regeneration tower by the pump (10). The rich liquid enters from the upper part of the regeneration tower, and part of the SO is desorbed by stripping 2 , and then int...

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Abstract

The invention discloses a novel absorbent which can remove SO2 and recover high-consistency SO2 at the same time, aiming at the characteristics of mixed gases such as flue gases of boilers of power plants, metallurgy sintering flue gases, sulfuric acid industrial tail gases, etc. The absorbent provided by the invention has the compositions as follows: (1) the absorbent has substance which contains 2 to 50 percent organic cations and 2 to 50 percent inorganic anions by mass concentration and is used as main component removing the SO2; (2) alkyl alcohol amide with the mass concentration of 0.1 to 3 percent is used as activator for removing the SO2; (3) phenols and quinones with the mass concentration of 0.1 to 0.2 percent are used as antioxidant of the absorbent; (4) metal oxide or inorganic salt with the mass concentration of 0.1 to 0.2 percent is used as corrosion inhibitor of the absorbent; (5) 5 to 95 percent of water is contained. The absorbent absorbs the SO2 gas in the mixed gases under the low temperature of 20 to 80 DEG C, dissolves the SO2 gas under high temperature of 85 to 130 DEG C, and generates the SO2 by-product with the concentration more than 99 percent (dry basis); the absorbent is circularly used.

Description

technical field [0001] The invention relates to an absorbent formulation for removing and recovering sulfur dioxide from mixed gas, belonging to the fields of environmental protection and chemical gas separation. Background technique [0002] my country's air pollution is dominated by soot, and the primary pollutant is sulfur dioxide. my country's annual emission of sulfur dioxide is more than 20 million tons, ranking first in the world. The sulfuric acid type acid rain pollution damage area mainly caused by sulfur dioxide discharge reaches 40% of the national land area, and the whole country loses hundreds of billions of yuan every year, and the latest data shows that it reaches 500 billion yuan. Sulfur dioxide pollution has become an important factor restricting the sustainable development of my country's economy and society, and it is imperative to control sulfur dioxide pollution. [0003] The industrial application of sulfur dioxide flue gas desulfurization technology...

Claims

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Application Information

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IPC IPC(8): B01D53/50B01D53/14C01B17/56
Inventor 肖九高汪志和曹静陈光祥
Owner HUAXI CHEM INST CHENGDU CITY
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