CN215886385U

CN215886385U - Silicon oxide preparation system

Info

Publication number: CN215886385U
Application number: CN202122229697.8U
Authority: CN
Inventors: 郑晓仁; 黄江波; 唐成; 黄东阳; 邓帅
Original assignee: Zhejiang Sanshi New Material Technology Co ltd
Current assignee: Zhejiang Sanshi New Material Technology Co ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2022-02-22
Anticipated expiration: 2031-09-15

Abstract

The utility model relates to a silicon oxide preparation system, which comprises a providing unit for providing chlorosilane; a preparation unit connected to the providing unit to prepare siloxane by chlorosilane provided by the providing unit and generate a hydrochloric acid solution and methanol, wherein the preparation unit includes a connected alcoholysis reactor and a hydrolysis reactor; the processing unit is connected with the preparation unit to process the hydrochloric acid solution and the methanol generated by the preparation unit and provide chloroalkane, and the processing unit is connected with the providing unit to take the chloroalkane provided by the processing unit as a reactant to participate in the preparation of chlorosilane; a calcination unit connected to the preparation unit to calcine siloxane from the preparation unit to obtain silica. According to the silicon oxide preparation system, the hydrochloric acid molten salt realizes the internal circulation of the system, and the problem that chlorosilane directly reacts with water too violently is solved through the connected alcoholysis reactor and the hydrolysis reactor.

Description

Silicon oxide preparation system

Technical Field

The present invention relates to siloxanes, and more particularly to a silica production system.

Background

Existing silica production systems typically require the discharge of large volumes of industrial waste water, such as acid solutions, and chlorosilanes and water often suffer from violent reactions.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems of the prior art such as the reaction severity of the silicon oxide production system, the present invention provides a silicon oxide production system.

The silicon oxide production system according to the present invention comprises: a providing unit for providing chlorosilane; a preparation unit connected to the providing unit to prepare siloxane by chlorosilane provided by the providing unit and generate a hydrochloric acid solution and methanol, wherein the preparation unit includes a connected alcoholysis reactor and a hydrolysis reactor; the processing unit is connected with the preparation unit to process the hydrochloric acid solution and the methanol generated by the preparation unit and provide chloroalkane, and the processing unit is connected with the providing unit to take the chloroalkane provided by the processing unit as a reactant to participate in the preparation of chlorosilane; a calcination unit connected to the preparation unit to calcine siloxane from the preparation unit to obtain silica.

Preferably, the providing unit comprises a fluidized bed reactor for synthesizing the methyltrichlorosilane by the direct method from the silicon powder and the monochloromethane provided by the processing unit.

Preferably, the fluidized bed reactor includes a catalyst.

Preferably, the processing unit comprises a chlorination reactor for chlorinating methanol to form methyl chloride.

Preferably, the chlorination reactor is a methanol chlorinator.

Preferably, the alcoholysis reactor is a reactor for reacting methyltrichlorosilane and methanol provided by a fluidized bed reactor to produce methylsiloxane and hydrogen chloride.

Preferably, the preparation unit further comprises a rectification column coupled to the alcoholysis reactor for absorbing hydrogen chloride with water to form a hydrochloric acid solution.

Preferably, the hydrolysis reactor is a reactor for hydrolyzing methylsiloxane supplied from the alcoholysis reactor to obtain a methylsiloxane slurry and methanol.

Preferably, the preparation unit further comprises a filter for filtering the methylsiloxane slurry provided by the hydrolysis reactor to obtain methylsiloxane.

Preferably, the filter is a filtration cleaning device and provides methanol.

According to the silicon oxide preparation system, the silicon oxide with high purity can be obtained in the calcining unit by supplying the silicon powder to the providing unit, the hydrochloric acid solution and the methanol generated by the preparation unit realize the internal circulation of the system, and the zero emission is realized, wherein the preparation unit also solves the problem that the direct reaction of the chlorosilane and the water is too violent through the connected alcoholysis reactor and the hydrolysis reactor.

Drawings

FIG. 1 is an overall schematic view of a silicon oxide production system according to a preferred embodiment of the present invention;

FIG. 2 is a schematic diagram of the connection of the providing unit of FIG. 1;

FIG. 3 is a schematic view of the connection of the preparation unit of FIG. 1;

fig. 4 is a schematic diagram of the connection of the processing unit of fig. 1.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1, a silicon oxide production system according to a preferred embodiment of the present invention includes a supply unit 1, a production unit 2, a treatment unit 3, and a calcination unit 4, wherein the supply unit 1 is used to supply chlorosilane 1a, the production unit 2 is connected to the supply unit 1 to produce siloxane 2c by supplying the chlorosilane 1a supplied from the supply unit 1, the treatment unit 3 is connected to the production unit 2 to treat hydrochloric acid solution 2a and methanol 2b produced from the production unit 2 and supply monochloromethane 3a, and the calcination unit 4 is connected to the production unit 2 to calcine the siloxane 2c from the production unit 2 to obtain silicon dioxide.

As shown in fig. 2, the supply unit 1 is a fluidized bed reactor. In this embodiment, the fluidized bed reactor includes a catalyst, such as an active copper-based procatalyst and a zinc/tin cocatalyst. Specifically, methyl trichlorosilane 1a is synthesized by a direct method (Rochow method) from freshly supplied silicon powder and monochloromethane 3a from treatment unit 3 under the action of a catalyst in a fluidized bed reactor.

As shown in fig. 3, the preparation unit 2 includes an alcoholysis reactor 21, a hydrolysis reactor 22 and a filter 23 connected. Specifically, the methyltrichlorosilane 1a from the providing unit 1 reacts with methanol in the alcoholysis reactor 21 to generate methylsiloxane 21a and hydrogen chloride, wherein the methylsiloxane 21a enters the hydrolysis reactor 22 to react with water to obtain methylsiloxane slurry 22a and methanol, so that the problem that the methyltrichlorosilane directly reacts with water too violently is solved by alcoholysis and hydrolysis, and the hydrogen chloride is separated by rectification and then discharged from the top of the tower to be absorbed by water to form a hydrochloric acid solution 2a provided for the treatment unit 3. The filter 23 is a filtration cleaning device. Specifically, the methyl siloxane slurry 22a from the hydrolysis reactor 22 is cleaned by filtration to obtain a methyl siloxane cake and methanol 2b supplied to the treatment unit 3, and the methyl siloxane cake is broken up by drying to obtain methyl siloxane powder 2c, also referred to as methyl silsesquioxane polymer powder, the spherical or angular shape of which is not limited.

As shown in fig. 4, the treatment unit 3 is a chlorination reactor. In this example, the chlorination reactor is a methanol chlorinator. Specifically, the hydrochloric acid solution 2a from the alcoholysis reactor 21 of the preparation unit 2 is reacted with methanol 2b from the filter 23 of the preparation unit 2 in a chlorination reactor to form methyl chloride 3a to be supplied to the supply unit 1.

Returning to FIG. 1, the calcination unit 4 is a closed vessel, and the siloxane 2c from the preparation unit 2 is heated to 800-1200 ℃ in an atmosphere containing oxygen to be calcined, thereby obtaining high-purity silicon oxide.

The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and various changes may be made in the above embodiments of the present invention. All simple and equivalent changes and modifications made according to the claims and the content of the specification of the present application fall within the scope of the claims of the present patent application. The utility model has not been described in detail in order to avoid obscuring the utility model.

Claims

1. A silicon oxide production system, comprising:

a providing unit for providing chlorosilane;

a preparation unit connected to the providing unit to prepare siloxane by chlorosilane provided by the providing unit and generate a hydrochloric acid solution and methanol, wherein the preparation unit includes a connected alcoholysis reactor and a hydrolysis reactor;

the processing unit is connected with the preparation unit to process the hydrochloric acid solution and the methanol generated by the preparation unit and provide chloroalkane, and the processing unit is connected with the providing unit to take the chloroalkane provided by the processing unit as a reactant to participate in the preparation of chlorosilane;

a calcination unit connected to the preparation unit to calcine siloxane from the preparation unit to obtain silica.

2. The silicon oxide production system according to claim 1, wherein the supply unit includes a fluidized bed reactor for synthesizing methyltrichlorosilane by a direct method from silicon powder and monochloromethane supplied from the treatment unit.

3. The silica production system of claim 2, wherein the fluidized bed reactor includes a catalyst.

4. The silica production system of claim 2 wherein the processing unit includes a chlorination reactor for chlorinating methanol to form methyl chloride.

5. The silica production system of claim 4, wherein the chlorination reactor is a methanol chlorinator.

6. The silica production system of claim 2, wherein the alcoholysis reactor is a reactor for reacting methyltrichlorosilane and methanol provided from a fluidized bed reactor to produce methylsiloxane and hydrogen chloride.

7. The silica production system of claim 6, wherein the production unit further comprises a rectification column coupled to the alcoholysis reactor for absorbing hydrogen chloride with water to form a hydrochloric acid solution.

8. The system of claim 6, wherein the hydrolysis reactor is a reactor for hydrolyzing methyl siloxane provided from the alcoholysis reactor to produce a methyl siloxane slurry and methanol.

9. The system for producing silicon oxide according to claim 8, wherein the production unit further comprises a filter for filtering the methylsiloxane slurry supplied from the hydrolysis reactor to obtain methylsiloxane.

10. The silica production system of claim 9, wherein the filter is a filtration cleaning device and provides methanol.