Method for desulfurization cogenerating of hydrogen and sulfuric acid

Abstract

The invention discloses a method for desulfurization cogenerating of hydrogen and sulfuric acid. The method includes three main steps, namely SO2 absorption and conversion, Fe3+regeneration and H2 cogeneration and F2+removal and H2 cogeneration. In the method, a Fe3+ / F2+ electrochemical pair is adopted as a process catalyst, indirect electrochemical oxidation is realized, sulfur dioxide in a gas phase is removed by using a sulfuric acid water solution wet method, and hydrogen and sulfuric acid can be cogenerated at the same time. The method is high in process efficiency and energy utilization rate, low in equipment investment and production cost, safe and reliable in process and conducive to large-scale industrialization, and is an environment-friendly technology for desulfurization, comprehensive utilization of sulfur dioxide and cogeneration of hydrogen and sulfuric acid.

Description

technical field [0001] The invention relates to a method for desulfurization and co-production of hydrogen and sulfuric acid, in particular to a method for removing sulfur dioxide in the gas phase and co-producing hydrogen and sulfuric acid at the same time, belonging to the technical field of three wastes treatment and resource utilization, especially for the removal of sulfur dioxide It belongs to the field of comprehensive utilization technology; it also belongs to the field of hydrogen and sulfuric acid preparation technology, especially the field of hydrogen energy preparation technology; it also belongs to the field of electrochemical reaction engineering and chemical separation technology. 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] Coa...

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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

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

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