Method and device for removing impurity-sulfur dichloride in thionyl chloride

A technology of thionyl chloride and sulfur dichloride, which is applied in the direction of sulfur and halogen compounds, can solve problems such as pipeline blockage, inability to realize continuous production, and no specific conditions given, and achieve the effect of convenient supplementation

Active Publication Date: 2016-02-24
SHANDONG KAISHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) The specific conditions for the conversion of sulfur dichloride and solid sulfur into sulfur monochloride are not given, and the complete removal of sulfur dichloride cannot be ensured
[0009] (2) When the device is shut down and started up again, due to the temperature drop of the pipeline, the oversulfurization tank and the solid sulfur in it, some of the gas will condense, and the condensed material will wash the solid sulfur to the bottom of the oversulfurization tank, causing the pipeline road congestion, especially in winter
However, whe

Method used

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  • Method and device for removing impurity-sulfur dichloride in thionyl chloride

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Experimental program
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Effect test

Embodiment 1-3

[0031] Present embodiment 1-3 all adopts following device:

[0032] Such as figure 1 As shown, the described device for removing impurity sulfur dichloride in thionyl chloride comprises a crude product receiving tank 1, and the crude product receiving tank 1 passes through a pipeline and a sulfur distribution tank 2, a rectifying tower 3, a heater 4, an oversulfur The tanks 5 are connected successively, and the liquid sulfur line 8 is arranged on the top of the sulfur distribution tank 2 .

[0033] The top of the oversulfur tank 5 is connected with a sulfur feeding tank 7 through a pipeline, and a spherical valve 6 is arranged on the pipeline between the oversulfur tank 5 and the sulfur feeding tank 7 .

[0034] The bottom of the oversulfur tank 5 is connected to the crude product receiving tank 1 and the sulfur distribution tank 2 respectively.

Embodiment 1

[0036] The crude thionyl chloride is pumped into the sulfur distribution tank 2 from the crude product receiving tank 1, and then liquid sulfur is added to the sulfur distribution tank 2 through the liquid sulfur line 8, so that sulfur dichloride and sulfur react to convert sulfur monochloride into sulfur monochloride. Containing sulfur dichloride in the crude product sulfur oxychloride behind the sulfur records and is 2.3%, pushes into rectifying tower 3 and is carried out rectifying separation under the condition of 4kPa at tower top pressure, the sulfur oxychloride that tower top separates and Sulfur dichloride enters the heater 4, and the temperature rises to 85°C. It enters from the bottom of the oversulfur tank 5, and after passing through the 700mm high sulfur bed, the sulfur dichloride in the product sulfur oxychloride at the top of the oversulfur tank 5 is measured. The content of 0.003% has reached the requirement of 1# color of superior products in the industry stand...

Embodiment 2

[0039] The crude thionyl chloride is pumped into the sulfur distribution tank 2 from the crude product receiving tank 1, and then liquid sulfur is added to the sulfur distribution tank 2 through the liquid sulfur line 8, so that sulfur dichloride and sulfur react to convert sulfur monochloride into sulfur monochloride. Containing sulfur dichloride in the crude product thionyl chloride after the sulfur is measured as 2.0%, enters rectifying tower 3 and is carried out rectifying separation under the condition of 7kPa at tower top pressure, the thionyl chloride that tower top separates and Sulfur dichloride enters the heater 4, and the temperature rises to 88°C. It enters from the bottom of the oversulfur tank 5, and after passing through the 790mm high sulfur bed, the sulfur dichloride in the product sulfur oxychloride at the top of the oversulfur tank 5 is measured. The content of sulfur dioxide is 0.0025%, and after running continuously for 2 hours, the height of the sulfur bed...

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Abstract

The invention belongs to the technical field of chemical production, and specifically relates to a method and a device for removing the impurity-sulfur dichloride in thionyl chloride. The method comprises the step of enabling thionyl chloride gas which is evaporated from the top part of a rectifying tower and contains 1 to 3 percent of sulfur dichloride to be subjected to temperature rising and to enter an over-vulcanization tank for reaction. The device comprises a crude product receiving tank, wherein the crude product receiving tank is sequentially connected with a sulfur preparing tank, the rectifying tower, a heater and the overvulcanization tank through pipelines; the top part of the sulfur preparing tank is provided with a hydraulic sulfur line. According to the method and the device, disclosed by the invention, 1 to 3 percent of sulfur dichloride which is contained in the thionyl chloride can be reduced to be below 0.004 percent; the requirement on color I of excellent products in industry standard is achieved; the problem that a pipeline arranged at the bottom part of the sulfur preparing tank is blocked can be solved, and continuous production is realized.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a method and a device for removing impurity sulfur dichloride in thionyl chloride. Background technique [0002] Thionyl chloride is a commonly used chlorinating agent. Because the reaction by-products are only two gases, sulfur dioxide and hydrogen chloride, it is easy to separate from the target product. It is widely used in the synthesis and production of medicines, pesticides, dyes and food additives. In recent years, It has also been widely used in the lithium battery industry. With the continuous expansion of the use of thionyl chloride, the quality requirements for it are also getting higher and higher. [0003] Sulfur dichloride is the raw material for the synthesis of sulfur oxychloride by the gas phase method of sulfur dioxide, and it is also an impurity in the crude product of sulfur oxychloride. The reaction formula is: Cl 2 +SCl 2 +SO 2 =2...

Claims

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Application Information

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IPC IPC(8): C01B17/45
Inventor 张善民毕义霞谢圣斌孙丰春李志忠王志国
Owner SHANDONG KAISHENG NEW MATERIALS
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