Check patentability & draft patents in minutes with Patsnap Eureka AI!

Preparation method of hexamethyldisiloxane

A technology of hexamethyldisiloxane and trimethylchlorosilane, which is applied in the field of preparation of hexamethyldisiloxane, can solve the problems of waste of chlorine, low concentration of hydrochloric acid, and high energy consumption of hydrogen chloride

Pending Publication Date: 2020-04-14
杭州崇耀科技发展有限公司 +1
View PDF10 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method produces more hydrochloric acid by hydrolysis, and the concentration of hydrochloric acid is low, and the recovery and use are limited, resulting in waste of chlorine elements, and the energy consumption of low-level hydrogen chloride recovery is also very large

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of hexamethyldisiloxane

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The invention provides a kind of preparation method of hexamethyldisiloxane, comprising the following steps:

[0034] A) Concentrated hydrochloric acid and trimethylchlorosilane are sequentially transported to a hydrolysis reactor to perform a hydrolysis reaction to obtain a hydrolyzate;

[0035] The pressure of the hydrolysis reaction is 0.05~0.2MPa;

[0036] B) The obtained hydrolyzate is transported to the heat exchanger for heating, then enters the gas-liquid separation tower, hydrogen chloride gas is separated from the hydrolyzate, enters the condenser, collects hydrogen chloride gas from the top of the condenser, and obtains hydrochloric acid from the bottom of the condenser Mixtures with hexamethyldisiloxane;

[0037] The mixture of hexamethyldisiloxane and concentrated hydrochloric acid is obtained at the bottom of the gas-liquid separation tower;

[0038] C) The mixture of hexamethyldisiloxane and concentrated hydrochloric acid obtained from the bottom of the...

Embodiment 1

[0068] Example 1 Production of hexamethyldisiloxane by continuous process.

[0069] 1) 108 parts of trimethylchlorosilane with a content of 99% are continuously transported to a mixer hydrolyzer with 36.5% concentrated hydrochloric acid at a pressure of 0.1 MPa with a canned pump, and hydrolyzed with water in hydrochloric acid to obtain Hexa A mixture of base disiloxane, concentrated hydrochloric acid, and hydrogen chloride gas produced by hydrolysis.

[0070] 2) The mixed material enters the heat exchanger through its own pressure and is heated to 50 degrees to enter the gas-liquid separation tower. 37 parts of hydrogen chloride gas are separated from the mixture, and 35 parts of hydrogen chloride gas are collected after entering the condenser for condensation and purification.

[0071] 3) 121 parts of hexamethyldisiloxane and concentrated hydrochloric acid mixture were obtained at the bottom of the gas-liquid separation tower, and mixed with 2 parts of recovered liquid in st...

Embodiment 2

[0076] Example 2 Batch production of hexamethyldisiloxane.

[0077] 1) 108 parts of trimethylchlorosilane with a content of 99% are continuously transported by a canned pump to a mixer containing 50 parts of 36.5% concentrated hydrochloric acid, and hydrolyzed with water in hydrochloric acid to obtain hexamethyldisiloxane The mixture of alkane, concentrated hydrochloric acid, and hydrogen chloride gas produced by hydrolysis is 158 parts, and the pressure of the mixer is continuously increased, finally reaching 0.12MPa.

[0078] 2) After feeding the trimethylchlorosilane, close the feeding valve and stop the delivery pump. The mixed material enters the heat exchanger to be heated to 50 degrees through its own pressure, and then enters the gas-liquid separation tower. 37 parts of hydrogen chloride gas are separated and desorbed from the mixture, and enter the condenser from the top of the tower. After condensation and purification, 35 parts of hydrogen chloride gas are collected...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a preparation method of hexamethyldisiloxane, and the method comprises the following steps: a) sequentially conveying concentrated hydrochloric acid and trimethylchlorosilane into a hydrolysis reactor, and hydrolyzing to obtain a hydrolysate; wherein the pressure of the hydrolysis reaction is 0.05 to 0.2 MPa; b) conveying the obtained hydrolysate to a heat exchanger for heating, then feeding the hydrolysate into a gas-liquid separation tower for separating hydrogen chloride gas from the hydrolysate, feeding the hydrogen chloride gas into a condenser, and collecting the hydrogen chloride gas from the top of the condenser, c) conveying a mixture obtained at the bottom of the gas-liquid separation tower and a mixture obtained at the bottom of the condenser to a layeringdevice for layering; separating the upper oily liquid into a hexamethyldisiloxane washing tank, and washing to obtain a hexamethyldisiloxane crude product; conveying the lower hydrochloric acid waterlayer to a hydrochloric acid intermediate tank for recycling; and d) conveying the obtained hexamethyldisiloxane crude product to a rectifying tower for separation to obtain the hexamethyldisiloxanefrom the top of the tower. According to the method, low-concentration hydrochloric acid is not generated, and the utilization rate of the chlorine element is improved.

Description

technical field [0001] The invention belongs to the technical field of organosilicon chemical production, and in particular relates to a preparation method of hexamethyldisiloxane. Background technique [0002] With the rapid development of the organosilicon industry, the output of organosilicon chlorosilane monomers is also increasing. It is estimated that by the end of this year, the total production capacity of domestic organosilicon monomer manufacturers will be about 2500kt / a. Hexamethyldisiloxane is an important primary raw material for silicone, often used as an end-capping agent for the production of silicone oil, polyether modified silicone oil, silicone release agent, or for silicon Cleaning agents for rubber, pharmaceuticals, gas chromatography stationary liquids, analytical reagents, water-repellent agents, and medical electronic components. The Si-O-Si bond in the molecular chain structure of hexamethyldisiloxane has a relatively high chemical bond energy (460....

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C07F7/08C07F7/20
CPCC07F7/0838C07F7/0874C07F7/20
Inventor 宋新锋徐建良汪瑜华刘常锋杨雪忠邵斌黄涛杨昌勤胡庆
Owner 杭州崇耀科技发展有限公司
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com