Method for absorbing sulfur dioxide and co-producing sulphur

A sulfur dioxide and sulfur technology, applied in chemical instruments and methods, separation methods, preparation/purification of sulfur, etc., can solve problems such as low absorption efficiency and comprehensive utilization rate, harsh reaction conditions, complex processes and equipment, etc., to achieve comprehensive Utilization, mild reaction conditions, and high-efficiency absorption effects

Active Publication Date: 2013-09-25
CENT SOUTH UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] To sum up, the efficient absorption and comprehensive utilization of sulfur dioxide is the key to the treatment of sulfur dioxide-containing gas. However, the existing technology still has problems such as complex process and equipment, harsh reaction conditions, low absorption efficiency and comprehensive utilization rate.

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  • Method for absorbing sulfur dioxide and co-producing sulphur
  • Method for absorbing sulfur dioxide and co-producing sulphur
  • Method for absorbing sulfur dioxide and co-producing sulphur

Examples

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Embodiment 1

[0036] (1) In a closed reactor, charcoal is used as a reducing agent, the molar ratio of carbon to calcium sulfite in charcoal is 2.5:1, the reaction temperature is 900°C, and the reaction time is 1.5h, to obtain calcium sulfide. The XRD pattern is shown in figure 2 ;

[0037] (2) In a closed reactor, use methanol as a solvent, add calcium sulfide, control the mass ratio of solvent to calcium sulfide to be 5:1, feed sulfur dioxide under stirring conditions, and control the amount of SO 2 The molar ratio to calcium sulfide is 1.5:1, stirred and reacted at 20°C for 12h, filtered to separate the filtrate from the solid reaction product, and the filtrate was recycled as a solvent, the solid reaction product was dissolved by carbon disulfide, and the filtrate and filter residue were obtained by filtration (see XRD pattern in image 3 ), the filter residue is recycled as a raw material for the preparation of calcium sulfide, and the filtrate is evaporated to obtain a solid sulfur p...

Embodiment 2

[0039] (1) In a closed reactor, coal is used as a reducing agent, the molar ratio of carbon in coal to calcium sulfite is 2.5:1, the reaction temperature is 900°C, and the reaction time is 1.5 hours to obtain calcium sulfide;

[0040] (2) In a closed reactor, use ethanol as a solvent, add calcium sulfide, control the mass ratio of solvent to calcium sulfide to be 4:1, feed sulfur dioxide under stirring conditions, and control the amount of SO 2The molar ratio with calcium sulfide is 1.5:1, stirred and reacted at 30°C for 10h, filtered to separate the filtrate from the solid reaction product, and the filtrate was recycled as a solvent, the solid reaction product was dissolved by carbon disulfide, filtered to obtain the filtrate and filter residue, and the filter residue was used as a preparation The raw material of calcium sulfide is recycled, and the filtrate is evaporated to obtain a solid sulfur product. The sulfur dioxide absorption rate is 87.46%, and the sulfur yield rate...

Embodiment 3

[0042] (1) In a closed reactor, coal is used as the reducing agent, the molar ratio of carbon element in coal to calcium sulfate is 3:1, the reaction temperature is 1000°C, and the reaction time is 1.5h to obtain calcium sulfide;

[0043] (2) in such as Figure 5 In the reaction device shown, methanol is used as a solvent in each reactor, calcium sulfide is added, the mass ratio of solvent to calcium sulfide is controlled to be 5:1, and the sintering flue gas of a steel plant in Hunan is passed into the sintering flue gas under stirring conditions. The concentration of sulfur dioxide is 1500mg / m 3 At the beginning, valves 2, 5, 7, and 9 are closed, and valves 1, 3, 4, 6, and 8 are opened, so that the flue gas passes through the primary reactor 10 and the secondary reactor 11 in turn, and waits for the exhaust gas in the primary reactor 10 After the calcium sulfide reaction is complete, switch the valves to: close valves 1, 3, 5, and 8, open valves 2, 4, 6, 7, and 9, so that t...

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Abstract

The invention provides a method for absorbing sulfur dioxide and co-producing sulphur. The method comprises the following basic steps of: mixing calcium sulfite or/and calcium sulfate with a carbon-based reducing agent; roasting for 1.5 to 2 hours at 800 to 1,000 DEG C to obtain calcium sulphide; adding calcium sulphide, methanol or/and ethanol to a reactor; adjusting the liquid-solid mass ratio to 3 to 10:1; charging sulfur dioxide containing gas along with stirring; stirring for reacting sulfur dioxide with calcium sulphide under room temperature of 0 to 40 DEG C; separating after the reaction is done to obtain sulphur and a mixture containing calcium sulfite and calcium sulfate. By adopting the method, the sulfur dioxide in the gas can be absorbed, and the sulfur can be recovered; the method has the advantages of being economic, efficient and free of waste residues.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for absorbing sulfur dioxide and co-producing sulfur. Background technique [0002] At present, a large amount of sulfur dioxide is produced in the process of power generation in thermal power plants and smelting of sulfide ores. The existing treatment methods generally use calcium oxide, slaked lime or sodium hydroxide solution to absorb sulfur dioxide. Although this method can solve the problem of sulfur dioxide emission, the large amount of waste residue produced is difficult to consume. Due to the great concern of the government and the public on environmental protection and the improvement of tail gas emission standards, it is urgent to develop a new process for sulfur dioxide treatment with low cost and no waste residue emission. [0003] McCrea et al. used copper oxide and methane to adsorb sulfur dioxide in the flue gas. After the ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50C01B17/04
Inventor 钟宏王帅李昌新王海波刘广义
Owner CENT SOUTH UNIV
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