Preparation method of silica

A silicon dioxide and carbon dioxide technology, applied in the production of silicon dioxide, silicon oxide, bulk chemicals, etc., can solve the problems of complicated process, time-consuming, high temperature, etc.

Active Publication Date: 2011-04-20
XIAMEN UNIV +1
View PDF5 Cites 26 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former first replaces the organic solvent (mainly alcohol) gel with liquid carbon dioxide, then raises the carbon dioxide to a supercritical state, and finally heats and lowers the pressure to obtain silica aerogel (the process is complicated an

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 silica
  • Preparation method of silica
  • Preparation method of silica

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Supercritical carbonization reaction coupled with supercritical drying to prepare high pore volume silica products

[0031] Sodium silicate nonahydrate (Sinopharm Chemical Reagent Co., Ltd., analytical pure), carbon dioxide (Xiamen Tongan Air Separation Special Gas Plant, purity 98%).

[0032] First, load a sodium silicate aqueous solution with a concentration of 1 mol / L in the carbonization reactor, set the stirring speed to 800 rpm, and adjust the water bath temperature control system to the experimental temperature. Then start the supercritical fluid supply system, the supercritical fluid enters the preheater, reaches a certain temperature and pressure (reaction temperature 35℃, reaction pressure 9MPa), through the third valve let high-pressure carbon dioxide into the carbonization reactor for reaction, reaction time 30min . At the end of the reaction, close the third valve, press out the material, wash the material with deionized water 3 times until the by-pr...

Embodiment 2

[0037] Example 2: Supercritical carbonization reaction coupled with supercritical drying to prepare highly dispersed silica products

[0038] Sodium silicate nonahydrate (Sinopharm Chemical Reagent Co., Ltd., analytical grade), carbon dioxide (Xiamen Tongan Air Separation Special Gas Plant, purity 98%), ethanol (Sinopharm Group Chemical Reagent Co., Ltd., analytical grade)

[0039] First, load a sodium silicate aqueous solution with a concentration of 1mol / L in the carbonization reactor, add ethanol as an additive (the volume ratio of sodium silicate aqueous solution to ethanol is 4:1), set the stirring speed (800rpm), and adjust the water bath temperature control system to the experiment temperature. Then start the supercritical fluid supply system, the supercritical fluid enters the preheater, reaches a certain temperature and pressure (reaction temperature 35℃, reaction pressure 9MPa), through the third valve let high-pressure carbon dioxide into the carbonization reactor for re...

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

PropertyMeasurementUnit
Pore volumeaaaaaaaaaa
Oil absorption valueaaaaaaaaaa
Specific surface areaaaaaaaaaaa
Login to view more

Abstract

The invention provides a preparation method of silica, relating to a preparation method of silica materials. In the preparation method, sodium silicate aqueous solution is pumped into a carbonization agitated reactor, supercritical carbon dioxide or subcritical carbon dioxide is added into the carbonization agitated reactor for reaction, so that a reaction product silicide is obtained; after washing and filtering, filtrate enters an evaporator, and carbonate is recycled; a filter cake is pulped by solvent and then forms supercritical fluid which enters a supercritical drying kettle; and after drying, the solvent and the supercritical fluid are separated under reduced pressure in a separation tank, the pressure of the supercritical drying kettle is released, and the product of silica is obtained.

Description

Technical field [0001] The invention relates to a method for preparing silica materials, in particular to a method for preparing silica using super / subcritical fluid to participate in carbonization reaction (supercritical carbonization reaction) coupled with supercritical fluid drying (supercritical drying). Background technique [0002] Silica powder is an amorphous white powder. It is a non-toxic, odorless, and non-polluting non-metallic material. Its microstructure is flocculent and net-like quasi-particle structure. This special structure makes it have unique properties, such as: special optical and electrical properties, high magnetoresistance, nonlinear resistance, and high strength, high toughness, and good stability at high temperatures. It is widely used in catalyst carriers, decolorizers, matting agents, thermal insulation materials, rubber reinforcing agents, plastic fillers, ink thickeners, soft metal polishing agents, insulating and thermal insulation fillers, filler...

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): C01B33/12
CPCY02P20/54
Inventor 李军胡晓慧吕文生庄艺伟洪燕珍苏玉忠王宏涛汤培平汤道英谭玉泉
Owner XIAMEN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap