Method for recycling sulfur dioxide in thionyl chloride production

A technology of sulfur dioxide and thionyl chloride, applied in chemical instruments and methods, inorganic chemistry, thionyl chloride, etc., can solve the problems of increased unit consumption of raw materials, increased investment, and reduced product yield, achieving simple operation and improved Utilization rate and product yield, the effect of small investment in equipment

Inactive Publication Date: 2016-11-23
HUIZHI ENG SCI & TECH CO LTD
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Problems solved by technology

[0003] Part of the incompletely reacted tail gas in the production process enters the sulfur compounding section with the crude thionyl chloride product, and its main components are chlorine gas, sulfur dioxide, and a small amount of thionyl chloride vapor, and the remaining tail gas after the chlorine gas is absorbed by sulfur monochloride and Part of the non-condensable gas released during the distillation process is mainly composed of sulfur dioxide and a small amount of thionyl chloride vapor. If these substances are not recycled and directly enter the subsequent tail gas alkali cleaning system, it will not only increase the unit consumption of raw materials in the production process, but also reduce the product yield. , will also increase the consumption of liquid alkali in the tail gas absorption system, which will increase the investment

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  • Method for recycling sulfur dioxide in thionyl chloride production

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Embodiment 1

[0018] Such as figure 1 Shown, a method for reclaiming sulfur dioxide recycling in the production process of thionyl chloride comprises the following steps:

[0019] (1) The tail gas released from the sulfur oxychloride crude product into the crude product tank of the sulfur blending section, the sulfur blending kettle, and the separator, reflux tank, and finished product tank during the distillation process enters the tail gas condenser 1 for condensation, and the tail gas condenser 1 adopts - 20°C frozen brine is used as the refrigerant, and the recovery rate of sulfur dioxide reaches more than 90%;

[0020] (2) The sulfur dioxide gas in the tail gas is condensed into a liquid phase and enters the sulfur dioxide recovery tank 2, and a small amount of uncondensed tail gas enters the follow-up tail gas absorption system;

[0021] (3) The condensed sulfur dioxide liquid enters the sulfur dioxide vaporizer 3 and is gasified to slightly higher than the reaction system pressure (...

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Abstract

The invention belongs to the technical field of thionyl chloride production, and mainly relates to a method for recycling sulfur dioxide in the production of thionyl chloride. The method comprises the following steps: (a) the tail gas produced by the sulfur compounding process and the distillation process enters the tail gas condenser to condense the sulfur dioxide gas therein; (b) the condensed sulfur dioxide liquid enters the sulfur dioxide recovery tank; (c) adopts a sulfur dioxide vaporizer The recovered sulfur dioxide liquid is vaporized to a pressure slightly higher than the pressure of the reaction system and then returned to the reaction system for recycling. The invention greatly improves the utilization rate of sulfur dioxide and product yield, and has small equipment investment and simple operation.

Description

technical field [0001] The invention belongs to the technical field of thionyl chloride production, and mainly relates to a method for recycling sulfur dioxide in the production of thionyl chloride. Background technique [0002] Thionyl chloride (SOCl 2 ) is an important fine chemical raw material in the development of my country's national economy. In the "National High-tech Product Catalogue" issued by the former State Science and Technology Commission, "pharmaceuticals, veterinary drugs, pesticides, intermediates and products" are listed as high-tech products. Domestic production of thionyl chloride includes chlorosulfonic acid method, co-production method, sulfur trioxide method and sulfur dioxide gas phase method. The main raw material for the production of thionyl chloride by sulfur dioxide gas phase 2 , Cl 2 , S 2 Cl 2 , and its reaction equation is: S 2 Cl 2 +Cl 2 →SCl 2 SO 2 +Cl 2 +SCl 2 →SOCl 2 [0003] Part of the incompletely reacted tail gas in th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/45C01B17/56
CPCC01B17/4584C01B17/56
Inventor 张纪万
Owner HUIZHI ENG SCI & TECH CO LTD
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