Industrialized production method of gas-phase synthesis of chlorosulfonic acid using pure sulfur trioxide

Abstract

The invention discloses an industrial production method for synthesizing chlorosulfonic acid by utilizing a gas phase of pure sulphur trioxide. The industrial production method comprises the following steps: a, preparing 40 percent fuming sulphuric acid by using SO3 in pr imary flue gas; b, evaporating to prepare pure SO3 gas; c, desorbing hydrochloric acid to prepare pure HCl; d, synthesizing crude chlorosulfonic acid by using HCl gas and the pure SO3 gas; e, refining the chlorosulfonic acid; f, treating exhaust gas and the like. The pure SO3 gas does not contain SO2 gas, and the exhaust gas is little, so that the industrial production method is beneficial to protect the environment; the pure product does not contain other impurities, so that side reactions are reduced, the quality of a product is improved, the market competitiveness of the product is improved, and large-scale industrial production can be realized; the existing sulphuric acid and nicotinic acid production devices in a forepart industrial sulphuric acid can be fully utilized; the exhaust gas completely returns to an exhaust gas treatment system of an industrial sulphuric acid production device after being treated, so that the pollution discharge capacity is reduced.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry, and relates to an industrial production method for gas-phase synthesis of chlorosulfonic acid by using pure sulfur trioxide. Background technique [0002] As an important chemical raw material, chlorosulfonic acid is widely used in the manufacture of sulfa drugs, reactive dyes, detergents, plastics, pesticides, and raw materials for the defense industry. The traditional synthesis method of chlorosulfonic acid is to adopt HCl, SO 3 Gas phase synthesis method, raw material gas Cl 2 , H 2 Combustion in the HCl synthesis furnace to synthesize HCl gas, after cooling and dehydration, and SO 3 The gas is mixed and enters the chlorosulfonic acid synthesis tower, and the synthesized gas-phase chlorosulfonic acid is cooled into a liquid, and then flows into the finished product tank after being further reacted with HCl in the auxiliary absorption tower. In the traditional chlorosulfonic acid ...

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Problems solved by technology

This method is due to the large amount of SO in the system 2 Gases and non-reactive inert gases cause the synthesis tower, condenser and environmental protection treatment equipment sulfuric acid absorption tower, water absorption tower and alkali absorption tower to be huge, and also cause complicated maintenance in daily production, which is not conducive to the environment, and the cost of tail gas treatment is relatively high , while the low concentration of the product affects the quality

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