Sulfuric chloride separation and purification technique

A sulfuryl chloride and process technology, which is applied in the field of separation and purification of sulfuryl chloride in the reaction waste liquid of the production process of trifluoroacetyl chloride, can solve the problems of large waste acid discharge in the production cost of trifluoroacetyl chloride, and achieve the effect of reducing production costs

Inactive Publication Date: 2015-06-03
浙江化工院科技有限公司 +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The invention provides a process for separating and purifying sulfuryl chloride from the reaction waste liquid in the production process of trifluoroacet

Method used

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  • Sulfuric chloride separation and purification technique

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Effect test

Embodiment 1

[0022] According to the drawings in the manual figure 1 Sulfuryl chloride is separated and purified by double-tower continuous atmospheric distillation, and the production reaction waste liquid (2) comes from the trifluoroacetyl chloride production line, in which the mass contents of sulfuryl chloride, trifluorotrichloroethane, sulfur trioxide and pyrosulfuryl chloride are respectively 80%, 5%, 12% and 3%. Both the primary rectification tower (3) and the secondary rectification tower (8) are filled with glass spring packing. Pass the production reaction waste liquid (2) into the primary rectification tower (3) for rectification. The reflux ratio is 5, the number of theoretical plates is 10, and the stream (5) which is basically trifluorotrichloroethane and sulfur trioxide is obtained from the top of the tower, and is circulated to the reactor (1) to continue the reaction. A stream (4) mainly of sulfuryl chloride is obtained, wherein the mass content of sulfuryl chloride is a...

Embodiment 2

[0024] Other conditions are the same as in Example 1, but the production reaction waste liquid (2) is changed, wherein the mass contents of sulfuryl chloride, trifluorotrichloroethane, sulfur trioxide and pyrothionyl chloride are 85%, 7%, 4% and 4% respectively , collected from the top of the secondary distillation column (8), with a purity of 98.2% and a recovery rate of 80.3%.

Embodiment 3

[0026] Other conditions are the same as in Example 1, the reflux ratio of the primary rectification tower (3) is changed to 5, the purity of the high-purity sulfuryl chloride finished product (9) obtained after the secondary rectification is 99.1%, and the recovery rate is 75.4%.

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Abstract

The invention discloses a technique for separating and purifying sulfuric chloride from a trifluoro-acetyl chloride production reaction waste liquid by a double-tower rectification process. The technique can obtain the high-purity sulfuric chloride product, and has the advantage of low production cost. The prepared sulfuric chloride can be used for chlorination of aromatic compounds and the like.

Description

technical field [0001] The invention relates to a technology for separation and purification of sulfuryl chloride, in particular to a technology for separation and purification of sulfuryl chloride in reaction waste liquid in the production process of trifluoroacetyl chloride. Background technique [0002] Sulfuryl chloride is an important chemical product, which can be used in the chlorination of aromatic compounds, carboxylic acids, and other organic and inorganic compounds, as well as in the manufacture of pharmaceuticals, dyes, and surfactants. Its preparation method mainly includes three kinds: (1) chlorination method, react dry sulfur dioxide and chlorine gas in the presence of activated carbon catalyst, and the sulfuryl chloride produced is condensed to obtain sulfuryl chloride finished product; (2) use activated carbon or camphor as The catalyst reacts sulfur dioxide and chlorine directly to produce sulfuryl chloride; (3) The reaction is catalyzed by trifluorotrichlo...

Claims

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Application Information

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IPC IPC(8): C01B17/46
CPCC01B17/4592
Inventor 鲍宗必吕正璋任其龙徐卫国陈姝含杨亦文陈忠民胡杰苏宝根张治国邢华斌
Owner 浙江化工院科技有限公司
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