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Continuous preparing technology for low-viscosity simethicone

A technology for the preparation of simethicone oil, which is applied in the field of continuous preparation of low-viscosity simethicone oil, can solve the problems of affecting the quality of simethicone oil, telomerization cannot be completely eliminated, and easy introduction of silicon hydroxyl groups, etc., to achieve shortening The effect of lowering time, lower production process cost and improving product yield

Inactive Publication Date: 2015-11-25
TANGSHAN SANYOU SILICON IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Directly co-hydrolyzing dimethyldichlorosilane and trimethylchlorosilane to prepare simethicone oil, although the reaction process is short and the manufacturing cost is lower than the aforementioned method, but due to the need to wash to neutral after hydrolysis, a large amount of waste water will be generated, and The hydrolysis process is easy to introduce silanol, and telomerization cannot be completely eliminated in the later stage, which affects the quality of simethicone oil

Method used

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  • Continuous preparing technology for low-viscosity simethicone

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Comparison scheme
Effect test

Embodiment 1

[0034] A continuous preparation process of low-viscosity simethicone oil is carried out as follows:

[0035] Raw material feed ratio is as follows:

[0036] Trimethylchlorosilane: 10kg / h; Dimethyldichlorosilane: 280kg / h; Dilute acid water: 580kg / h

[0037] a. Hydrolysis

[0038] Trimethylchlorosilane and dimethyldichlorosilane are preliminarily mixed in the static mixer 11 at a ratio of 1:28 and then enter the tubular hydrolysis reactor 12 to react with dilute acid water. The dilute acid water here is dilute hydrochloric acid with a mass concentration of 0.8% (the washing water after the primary water washing in the washing process of the last kettle material can also be used). The hydrolysis temperature of the material in the hydrolysis reactor 12 is controlled at 30°C. After the feeding is completed, the residence time of the material in the hydrolysis system is 10 minutes. The material is transported to the hydrolysis cooler 15 for heat exchange through the hydrolysis ci...

Embodiment 2

[0053]A continuous preparation process of low-viscosity simethicone oil is carried out as follows:

[0054] Raw material feed ratio is as follows:

[0055] Trimethylchlorosilane: 10kg / h; Dimethyldichlorosilane: 280kg / h; Dilute acid water: 500kg / h

[0056] a. Hydrolysis

[0057] Trimethylchlorosilane and dimethyldichlorosilane are preliminarily mixed in the static mixer 11 at a ratio of 1:28 and then enter the tubular hydrolysis reactor 12 to react with dilute acid water. The dilute acid water here is dilute hydrochloric acid with a mass concentration of 0.8% (the washing water after the primary water washing in the washing process of the last kettle material can also be used). The material is controlled in the hydrolysis reactor 12 at a hydrolysis temperature of 40° C., and stays for 8 minutes. The material is transported to the hydrolysis cooler 15 for heat exchange through the hydrolysis circulation pump 14, and then enters the pre-separator 13 for pre-separation, and the...

Embodiment 3

[0072] A continuous preparation process of low-viscosity simethicone oil is carried out as follows:

[0073] Raw material feed ratio is as follows:

[0074] Trimethylchlorosilane: 15kg / h; Dimethyldichlorosilane: 285kg / h; Dilute acid water: 600kg / h

[0075] a. Hydrolysis

[0076] Trimethylchlorosilane and dimethyldichlorosilane are preliminarily mixed in the static mixer 11 at a ratio of 1:19 and then enter the tubular hydrolysis reactor 12 to react with dilute acid water. The dilute acid water here is dilute hydrochloric acid with a mass concentration of 0.8% (the washing water after the primary water washing in the washing process of the last kettle material can also be used). The material is controlled in the hydrolysis reactor 12 at a hydrolysis temperature of 30° C., and is held for 10 minutes. The material is transported to the hydrolysis cooler 15 for heat exchange through the hydrolysis circulation pump 14, and then enters the pre-separator 13 for pre-separation, and...

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Abstract

The invention relates to a production technology for simethicone, in particular to a continuous preparing technology for low-viscosity simethicone. The continuous preparing technology comprises the following steps that hydrolysis is carried out, wherein trimethylchlorosilane and dimethyldichlorosilane are preliminarily mixed according to a mass ratio and then enter a tubular hydrolysis reactor to carry out a reaction; washing is carried out, wherein hydrolysate is washed to be neutral through three levels of washing step by step; telomerization is carried out, wherein under the condition that a catalyst is added, an equilibration reaction is carried out on siloxane; hydroxyl is removed, wherein a hydroxyl scavenging agent is added in the filtered simethicone to remove silicon hydroxyl remaining in silicon oil; low molecules are desorbed, wherein the low molecules are desorbed through an inert gas bubbling device, and the silicon oil with the low molecules desorbed is filtered and stored. The production technology has the advantages that the problems that washing acid water is large in discharging amount and contains much organic manner, and waste water is difficult to treat are solved, the product yield and the quality of the simethicone are improved, the low molecule desorbing time is shortened, cost is lower, and efficiency is higher.

Description

technical field [0001] The invention relates to a production process of simethicone oil, in particular to a continuous preparation process of low-viscosity simethicone oil. Background technique [0002] In the production process of simethicone oil, it is widely used in the industry to prepare it through the equilibrium reaction of low molar mass dimethylcyclosiloxane (D4 or DMC) and hexamethyldisiloxane. [0003] Directly co-hydrolyzing dimethyldichlorosilane and trimethylchlorosilane to prepare simethicone oil, although the reaction process is short and the manufacturing cost is lower than the aforementioned method, but due to the need to wash to neutral after hydrolysis, a large amount of waste water will be generated, and Silicone hydroxyl groups are easily introduced during the hydrolysis process, and telomerization cannot be completely eliminated in the later stage, which affects the quality of simethicone oil. Contents of the invention [0004] The invention aims at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/06
Inventor 孙长江任海涛乔艳慧王春英李献起
Owner TANGSHAN SANYOU SILICON IND
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