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Method for preparing sodium sulphite with tail gas from thionyl chloride synthesis process

A technology of thionyl chloride and sodium sulfite, applied in the field of sodium sulfite production, can solve the problems of reduced solubility, low economic value, low purity, etc.

Active Publication Date: 2009-04-22
JIANGXI SELON INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In this paper, the concentration of HCl aqueous solution is controlled by controlling the intake water flow rate, and the HCl, SO 2 The two components are separated, but the principle of this method is only H in water + Concentration increases, SO 2 Solubility is reduced to control separation, purity is not high, and SO is absorbed by NaOH 2 , causing the solution to contain Na 2 SO 3 and NaHSO 3 Two substances with low economic value

Method used

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  • Method for preparing sodium sulphite with tail gas from thionyl chloride synthesis process
  • Method for preparing sodium sulphite with tail gas from thionyl chloride synthesis process

Examples

Experimental program
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Effect test

Embodiment 1

[0073] The tail gas separated from the filling, storage tank, rectification tower top separator, etc. during the synthesis and rectification of thionyl chloride, the gas contained in the tail gas is about 45-55% of sulfur dioxide and about 45% of thionyl chloride 35-45%. Absorb through the first absorption tower first. In the first absorption tower, the temperature of the absorption liquid is set at 10-20°C. The absorption liquid in the absorption tower is clear water. In this absorption tower, the chlorination in the tail gas The thionoxide begins to be decomposed into hydrogen chloride and sulfur dioxide, and the hydrogen chloride gas is cooled and absorbed by water simultaneously. In the gas after the first-stage absorption tower, the removal rate of hydrogen chloride is respectively 98%, and about 31% of commercial hydrochloric acid is obtained; The gas discharged from the first-stage absorption tower passes through the absorption liquid of the second-stage absorption towe...

Embodiment 2

[0075] The tail gas separated from the filling, storage tank, rectification tower top separator, etc. during the synthesis and rectification of thionyl chloride, the gas contained in the tail gas is about 45-55% of sulfur dioxide and about 45% of thionyl chloride 35-45%. It is first absorbed through the first-stage absorption tower. In the first-stage absorption tower, the temperature of the absorption liquid is set at 30-40°C. The absorption liquid in the absorption tower is dilute hydrochloric acid solution. In this absorption tower, the exhaust gas The thionyl chloride begins to decompose into hydrogen chloride and sulfur dioxide, and the hydrogen chloride gas is cooled and absorbed by water at the same time. In the gas after the first-stage absorption tower, the removal rate of hydrogen chloride is 92% respectively, and about 31% of the product is obtained. hydrochloric acid. The gas discharged from the first-stage absorption tower passes through the absorption liquid of ...

Embodiment 3

[0077]The tail gas separated from the filling, storage tank, rectification tower top separator, etc. during the synthesis and rectification of thionyl chloride, the gas contained in the tail gas is about 45-55% of sulfur dioxide and about 45% of thionyl chloride 35-45%. It is first absorbed through the first-stage absorption tower. In the first-stage absorption tower, the temperature of the absorption liquid is set at 50-60°C. The absorption liquid in the absorption tower is dilute hydrochloric acid solution. In this absorption tower, the exhaust gas The thionyl chloride begins to decompose into hydrogen chloride and sulfur dioxide, and the hydrogen chloride gas is cooled and absorbed by water at the same time. In the gas after the first-stage absorption tower, the removal rate of hydrogen chloride is 85% respectively, and about 31% of the product is obtained. Hydrochloric acid; the gas discharged from the first-stage absorption tower passes through the absorption liquid of th...

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Abstract

The invention provides a method for producing sodium sulfite by-products by utilizing tail gas separated in a filling area, a storage tank, a separator on the top of a rectifying tower and so on during the process of synthesis and rectification of thionyl chloride. The tail gas during the process of the rectification of the thionyl chloride in the method is absorbed by a primary absorption tower; an absorption liquid in the primary absorption tower is clear water or diluted hydrochloric acid; products discharged from the primary absorption tower are approximately 31 percent hydrochloric acid, and can be taken as industrial hydrochloric acid for sale or use; gas exhausted from the primary absorption tower passes through a secondary absorption tower; and an absorption liquid in the secondary absorption tower is an alkaline solution. The method absorbs and utilizes substances in the tail gas during the synthesis and the rectification of the thionyl chloride, so as to reduce environmental pollution during the synthesis of the thionyl chloride.

Description

technical field [0001] What the present invention relates to is the preparation method of thionyl chloride, more specifically, what the present invention relates to is a kind of process that utilizes thionyl chloride to be separated in filling, storage tank, rectification tower top separator etc. Sulfur dioxide is recovered from the exhaust gas for the production of sodium sulfite. Background technique [0002] Thionyl chloride is soluble in benzene, chloroform and carbon tetrachloride, decomposes in water to generate sulfurous acid and hydrogen chloride, and decomposes to generate chlorine gas, sulfur dioxide and sulfur monochloride when heated to 140°C. The chlorine atom of thionyl chloride replaces hydroxyl and mercapto It has a strong ability and can sometimes replace sulfur dioxide, oxygen or hydrogen. It can react with organic compounds such as phenols or alcohols with hydroxyl groups to generate corresponding chlorides, react with sulfonic acids to generate sulfonyl c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/14B01D53/48B01D53/50B01D53/68
Inventor 汪国清汪新泉戴恒文潘英曙李世群郑小辉刘朔
Owner JIANGXI SELON INDAL
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