A kind of method for preparing silica with high specific surface area by tubular continuous flow method

A high specific surface area, silica technology, applied in the direction of silica, silicon oxide, etc., can solve the problems of silica specific surface area that is difficult to break through, low production efficiency, safety hazards, etc., to achieve uniform concentration of reactants, The effect of sufficient contact and elimination of mass transfer problems

Active Publication Date: 2020-12-08
合肥星巢环保科技有限公司
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology requires expensive surfactants to disperse sodium silicate solution in supercritical carbon dioxide, and the high-pressure (>90bar) equipment required for the reaction is expensive, energy-consuming, and has potential safety hazards
And the production efficiency is not high
Moreover, the specific surface area of ​​the silica obtained by the above method is difficult to exceed 700m 2 / g

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
  • A kind of method for preparing silica with high specific surface area by tubular continuous flow method
  • A kind of method for preparing silica with high specific surface area by tubular continuous flow method
  • A kind of method for preparing silica with high specific surface area by tubular continuous flow method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for preparing silicon dioxide with a high specific surface area by a tubular continuous flow method, comprising the following steps:

[0035] (1) Prepare ammonium salt solutions and silicon source aqueous solutions of different concentrations, add the silicon source solution into the ammonium salt solution, wherein the silicon concentration in the silicon source solution is 0.2mol / L, and the concentration of the salt solution is 2.0mol / L;

[0036] (2) Regulate reaction system temperature, reaction temperature is at 40 ℃;

[0037](3) regulate the flow rate of carbon dioxide gas and silicon source solution, the flow rate of carbon dioxide gas and silicon source solution is controlled at 20ml / min, 2ml / min respectively, carbon dioxide gas and silicon source liquid are passed through the tee of continuous flow reactor simultaneously, thereby Produce alternating segment flow of gas and liquid, and the liquid part separated by carbon dioxide bubbles is called a liquid...

Embodiment 2

[0041] As a comparison, silica was prepared using the traditional intermittent bubbling method, the specific method is as follows:

[0042] 1. Mix the silicon source solution with the salt solution, the concentration is the same as in Example 1.

[0043] 2. Pass carbon dioxide gas into the above-mentioned solution, and keep stirring, the temperature and the flow rate of carbon dioxide are the same as in Example 1.

[0044] 3. The aftertreatment method is the same as in Example 2.

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
specific surface areaaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for preparing silicon dioxide with high specific surface area by using a tubular continuous flow method, and develops a novel precipitation method based on a small tube diameter tubular continuous flow method. The method is used for producing the silicon dioxide with high specific surface area, wherein a raw material for producing white carbon black is sodium silicate, silica sol or a mixed solution of sodium silicate and silica sol, and carbon dioxide gas serving as an acidifying agent goes through a gas-liquid alternating section flow formed by the tubular continuous flow method, so that the problem of mass and heat transfer on micro level is solved fundamentally. Therefore, according to the method disclosed by the invention, silicon dioxide with high specific surface area, small particles and stable product quality can be produced continuously.

Description

technical field [0001] The invention relates to the technical field of preparing precipitated silica, in particular to a method for preparing silica with a high specific surface area by a tubular continuous flow method. Background technique [0002] High specific surface area porous silica (industrial name: white carbon black) is a widely used chemical raw material. Its chemical formula can be SiO 2 ·nH 2 O, where the number n depends on the surface hydroxyl content. Silica has the characteristics of high specific surface area, porosity, high temperature resistance, stable chemical properties, and good electrical insulation performance. Its application fields include: rubber, plastics, papermaking, catalyst carriers, coatings, fuels, and food additives. In 2010, my country's silica production capacity was 1 million tons. In 2015, the demand for white carbon black in the world reached 2.1 million tons, with a market value of 2.5 billion US dollars. [0003] At present, t...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/18
CPCC01B33/18C01P2002/72C01P2002/82C01P2006/12C01P2006/14
Inventor 郭震王川王杰玉
Owner 合肥星巢环保科技有限公司
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