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Method for rectifying thionyl chloride

A technology of thionyl chloride and rectification, which is applied in the rectification field of thionyl chloride, can solve the problems of inability to realize large-scale production, low degree of automation, limited product purity, etc., and achieves high energy utilization rate and improved degree of automation. , the effect of good economic benefits

Inactive Publication Date: 2010-12-22
CHINA PINGMEI SHENMA GRP KAIFENG DONGDA CHEM
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Problems solved by technology

[0003] At present, in the chemical industry, the traditional process of purifying thionyl chloride is mainly batch rectification, which has a small capacity of a single device, a large floor area, large investment, cumbersome operation, high labor intensity and low degree of automation , large-scale production cannot be realized, and product purity is limited

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  • Method for rectifying thionyl chloride
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Embodiment 1

[0015] The rectification method of thionyl chloride adopts two-stage continuous rectification process, and its process flow chart is as follows figure 1 As shown, it includes primary rectification and secondary rectification, correspondingly adopts primary rectification tower and secondary rectification tower, and the sulfur oxychloride crude product with volume percentage concentration of 60% after sulfur supplementation is pumped to Feed the high-level tank, and then rely on the liquid level difference to continuously enter the first-stage rectification tower for rectification. The high boiler sulfur monochloride is continuously extracted from the bottom of the tower, and the sulfur monochloride is introduced into the high boiler storage tank, and the low boiler distilled from the top of the first-stage rectification column is removed through the sulfur oversulfurizer continuously. The side line of the primary rectification tower continuously extracts the semi-finished produ...

Embodiment 2

[0017] The rectification method of thionyl chloride adopts two-stage continuous rectification process, and its process flow chart is as follows figure 1 As shown, which includes primary rectification and secondary rectification, the primary rectification tower and secondary rectification tower are adopted accordingly, and the sulfur oxychloride crude product with a volume percentage concentration of 70% after sulfur supplementation is pumped to Feed the high-level tank, and then rely on the liquid level difference to continuously enter the first-stage rectification tower for rectification. The high boiler sulfur monochloride is continuously extracted from the bottom of the tower, and the sulfur monochloride is introduced into the high boiler storage tank, and the low boiler distilled from the top of the first-stage rectification column is removed through the sulfur oversulfurizer continuously. The side line of the primary rectification tower continuously extracts the semi-fini...

Embodiment 3

[0019] The rectification method of thionyl chloride adopts two-stage continuous rectification process, and its process flow chart is as follows figure 1 As shown, it includes primary rectification and secondary rectification, correspondingly adopts primary rectification tower and secondary rectification tower, and the sulfur oxychloride crude product that the volume percent concentration after sulfur supplementation is 65% is pumped to Feed the high-level tank, and then rely on the liquid level difference to continuously enter the first-stage rectification tower for rectification. The high boiler sulfur monochloride is continuously extracted from the bottom of the tower, and the sulfur monochloride is introduced into the high boiler storage tank, and the low boiler distilled from the top of the first-stage rectification column is removed through the sulfur oversulfurizer continuously. The side line of the primary rectification tower continuously extracts the semi-finished prod...

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Abstract

The invention discloses a method for rectifying thionyl chloride. A two-stage continuous rectification process is adopted. The method comprises the following steps of: continuously feeding a crude product of the thionyl chloride into a first-stage rectification column, continuously extracting sulfur monochloride from a column bottom of the first-stage rectification column, and continuously extracting a semifinished product of the thionyl chloride from a lateral line; and continuously feeding the semifinished product of the thionyl chloride into a second-stage rectification column, continuously extracting a finished product of the thionyl chloride on a column top of the second-stage rectification column, and feeding a mixture on a column bottom into the first-stage rectification column. Overcuring devices are arranged between the first-stage rectification column and a condenser connected therewith and between the second-stage rectification column and a condenser connected therewith. The rectification method can realize continuous large-scale production, can maintain the relatively stable yield and quality of products and has high energy utilization rate, high degree of automation and easy control of operation. Compared with the conventional discontinuous rectification, the method for rectifying the thionyl chloride has the advantages of remarkable improvement of the production capability of a single device, large-scale production, guarantee of production safety, reduction of production cost, and good economic benefit.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a rectification method of thionyl chloride. Background technique [0002] Thionyl chloride is an important fine chemical product and an intermediate in the synthesis of many chemicals. Because of its strong chlorination and acid chlorination ability, it can significantly improve the utilization of some expensive raw materials. As a chlorination reagent and acyl chloride reagent, thionyl chloride is mainly used in pesticides, medicines, dyes and other industries. It can also be used as a chlorination agent for the synthesis or replacement of alcohols, acid anhydrides, and nitro compounds. It can also be used as a chloracylating agent for the synthesis of compounds such as thiazoline, pyrrolidine, and amides in ring-closing reactions and in some organic synthesis reactions. Catalysts, etc., a large amount of thionyl chloride is also used in the production o...

Claims

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Application Information

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IPC IPC(8): C01B17/45
Inventor 海国栋王慧琴杨洪轩庄六星苗红振宋莹莹刘小丽
Owner CHINA PINGMEI SHENMA GRP KAIFENG DONGDA CHEM
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