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Production process of high-purity liquid sulfur trioxide

A liquid sulfur trioxide and production process technology, applied in the direction of sulfur trioxide/sulfuric acid, etc., can solve the problems of high quality requirements and non-compliance with the production requirements of acesulfame potassium

Pending Publication Date: 2022-03-22
ANHUI JINGHE IND
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Problems solved by technology

Liquid sulfur trioxide is needed in the production of acesulfame-K, and as a food additive, the quality of sulfur trioxide is high. Ordinary liquid sulfur trioxide contains sulfur dioxide and other reducing substances and impurities, which do not meet the production requirements of acesulfame-K.

Method used

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  • Production process of high-purity liquid sulfur trioxide

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Embodiment Construction

[0020] see figure 1 , a production process of high-purity liquid sulfur trioxide, comprising the following steps:

[0021] (1) Pass the flue gas produced at the outlet of the third stage in the sulfuric acid production process into the niacin absorption tower, and spray with niacin to absorb the sulfur trioxide in it, and the absorbed niacin enters the niacin circulation tank (furnace The niacin absorption tower discharges into the niacin circulation tank (the absorption acid concentration is 104.5% niacin), and the unabsorbed gas phase enters the first absorption tower;

[0022] (2) Part of the niacin in the niacin circulation tank is cooled to 35~44°C by the niacin cooler and used as the spray liquid of the niacin absorption tower to continue absorbing sulfur trioxide, and the other part passes through the niacin The preheater is heated to 90°C;

[0023] (3) The preheated niacin enters the evaporator and continues to be heated to 120~140°C to start evaporating. The heated ...

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Abstract

The invention relates to a production process of high-purity liquid sulfur trioxide, which comprises the following steps of: introducing flue gas generated at a three-section outlet in a sulfuric acid production process into a fuming acid absorption tower, spraying and absorbing sulfur trioxide by fuming acid, introducing the absorbed fuming acid into a fuming acid circulating tank, and introducing the fuming acid in the fuming acid circulating tank into the fuming acid absorption tower. One part continues to absorb sulfur trioxide through a fuming acid cooler, the other part is heated by a fuming acid preheater and enters an evaporator to be evaporated, the heated liquid phase returns to a fuming acid circulating tank to be recycled, and crude liquid sulfur trioxide is obtained after gas at the evaporation position is condensed; the liquid sulfur trioxide enters the upper part of the degassing tower, dry air enters the degassing tower from the lower part of the degassing tower, and the degassed liquid sulfur trioxide enters the sulfur trioxide storage tank to be stored. According to the process, the sulfur trioxide is absorbed, produced and purified by adopting absorption, evaporation, condensation and degassing processes, so that the purity of the sulfur trioxide is improved.

Description

technical field [0001] The invention relates to a production process of high-purity liquid sulfur trioxide. Background technique [0002] Liquid sulfur trioxide not only has the same properties as sulfuric acid and oleum, but also is used in many industries such as synthetic detergents, dyes, petroleum processing, synthetic fibers, medicine, pesticides, etc. The chemical, water-absorbing and drying properties are superior to those of concentrated sulfuric acid and fuming sulfuric acid. In foreign countries, there are not only companies or institutions specializing in the production and application of liquid sulfur trioxide, but also many production departments have used liquid sulfur trioxide instead of oleum. Nicotinic acid is used in industrial production. For example, the sulfonation of alkylbenzene in the production of synthetic detergents; the sulfonation and sulfation of higher alcohols and ethylene oxide adducts; the sulfonation of lubricating oil fractions in petrol...

Claims

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Application Information

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IPC IPC(8): C01B17/90
CPCC01B17/90
Inventor 龚喜胡中明张瑞际孟享收
Owner ANHUI JINGHE IND
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