SO2 absorbing and converting technological method

Abstract

The present invention provides a SO 2 The processing method of absorption conversion, the method is based on Fe 3+ Aqueous sulfuric acid solution as absorbent, Fe 3+ As an oxidizing agent, the SO 2 Absorb dissolved in sulfuric acid aqueous solution, absorb dissolved SO 2 with Fe 3+ The reaction converts to H 2 SO 4 , while Fe 3+ is reduced to Fe 2+ ; The obtained Fe 2+ Aqueous sulfuric acid can convert Fe 2+ Oxidation regeneration to Fe 3+ Afterwards, it can be recycled as an absorbent, or to remove Fe 2+ Preparation of sulfuric acid products. The present invention uses Fe 3+ is the oxidizing agent, SO 2 The absorption and conversion of SO 2 The removal efficiency is high, the conversion is thorough, and the operating conditions are mild. While realizing wet desulfurization, sulfuric acid can be co-produced, and through Fe 3+ / Fe 2+ The pair realizes Fe 3+ cyclic use; the utilization rate of atoms is high, the process is safe and reliable, and it is conducive to large-scale industrialization. is a SO 2 An effective method for removal and recycling of resources.

Description

technical field [0001] The present invention relates to a kind of SO 2 Processes for absorption conversion, especially those involving the removal of SO in the gas phase 2 , and a process for preparing sulfuric acid at the same time, belonging to the technical field of three wastes treatment and resource utilization, especially the technical field of comprehensive utilization of sulfur dioxide removal by wet method. Background technique [0002] Sulfur dioxide (SO 2 ), also known as sulfurous anhydride, is the most common sulfur oxide. It is a colorless, poisonous and strongly irritating acid gas at room temperature. It is denser than air and easily liquefied and soluble in water. [0003] Coal and petroleum usually contain sulfides, which generate SO when burned 2 ; Sulfur, hydrogen sulfide, pyrite and sphalerite and other sulfide-containing compounds will also generate SO when they are burned 2 . The chemical reaction formula is as follows: [0004] [0005] ...

AI Technical Summary

Problems solved by technology

However, due to the easy sublimation of iodine in the reaction process, the loss of iodine in the process is large, and the operation is difficult.

[0033] ③The reaction system is severely corroded: the hydroiodic acid aqueous solution is highly corrosive, especially when it coexists with sulfuric acid, and under high temperature conditions, the corrosiveness is extremely strong, and it is difficult to find suitable materials to meet the requirements of the process

[0041] ①HI Preparation I 2 There are problems such as electrode deactivation and difficult operation in the process: I 2 The melting point of I is 119°C, and it is solid at room temperature. I - Regenerated by electrochemical oxidation at the anode to obtain I 2 process, the operating temperature is usually at I 2 below the melting point, so I 2 Deposited on the surface of the anode, resulting in deactivation of the electrode, difficult operation, and difficult to achieve continuous operation

[0044] Using organic solvents: in order to improve I 2 Solubility, organic solvents such as benzene and toluene can be used, but the use of organic solvents will cause SO 2 The process of absorbing dissolution-oxidation conversion reaction to generate sulfuric acid becomes a liquid-liquid heterogeneous reaction process, which not only has the problem of liquid-liquid dispersion and mixing in the reaction process, but also has the problem of separation of the liquid-liquid heterogeneous system after the reaction. Due to the introduction of organic solvents, it will inevitably bring problems such as solvent recovery, loss, and system pollution. In particular, the existence of organic solvents will have adverse effects on the subsequent electrochemical regeneration process, such as the adsorption of organic matter on the electrodes, making the regeneration process difficult. conduct

[0045] ③ Hydroiodic acid is highly corrosive: Hydroiodic acid aqueous solution is highly corrosive, especially when it coexists with sulfuric acid and under high temperature conditions, it is extremely corrosive, and it is difficult to find suitable materials to meet the requirements of the process

[0046] Obviously, the above technologies are difficult to carry out industrial implementation

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