Method for preparing sulphuric acid

Abstract

The invention provides a new method of sulfuric acid production, which belongs to the chemistry industry production energy saving technical field. The method of the invention includes that the SO3 gas is fed to the pyrite or sulfur to produce SO2 gas; The SO2 gas is oxidized to SO3 gas after passing through the sulfur dioxide-air solid oxide fuel cell; part of the produced SO3 gas is fed to the pyrite or sulfur again to produce SO2 gas, part of the SO3 gas is fed to the dilute sulfuric acid to produce vitriol oil product. The solid electrolyte of the sulfur dioxide-air solid oxide fuel cell which the invention relates to is Ce0.8Sm0.2O1.9; the NiO is the anode of the fuel cell and the La0.7Sr0.3MnO3 is the cathode of the fuel cell; the operation temperature of the fuel cell is 500-700DEG C. the new method of sulfuric acid production has the advantages that part of the chemical energy in the sulfuric acid production is converted into electric energy; the production process of the sulfuric acid is processed in the cell closed system, so as to avoid the acid production tail gas exhaust and realize the integration of sulfuric production, chemical power generation and environmental protection.

Description

A method of producing sulfuric acid Technical field: The invention belongs to the technical field of chemical production and energy saving, and in particular relates to a method for producing sulfuric acid and the application of a sulfur dioxide-air solid oxide fuel cell in the production of sulfuric acid. Background technique: Sulfuric acid is a chemical product with a wide range of uses. The process of producing sulfuric acid with pyrite or sulfur as raw material is: first roast pyrite (FeS2) or sulfur to prepare SO2, and then oxidize SO2 into SO3 with air under the condition of 425-600°C and vanadium catalyst, and then dissolve SO3 in Dilute sulfuric acid produces concentrated sulfuric acid product. This production process has lasted for hundreds of years, but there are two defects. One is that a large amount of chemical energy is converted into heat and released in the production process, and then a large amount of cooling water needs to be consumed to maintain produc...

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Problems solved by technology

This production process has lasted for hundreds of years, but there are two defects. One is that a large amount of chemical energy is converted into heat and released in the production process, and then a large amount of cooling water needs to be consumed to maintain production. Although waste heat boilers are used Energy recovery, but the recovery efficiency is very low; second, the exhaust gas from acid production becomes one of the pollution sources of sulfur dioxide in the atmosphere

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