Deacidification method for vapor process of preparing nano SiO2

A technology of nano-silica and deacidification method, applied in the field of deacidification, can solve problems such as unsatisfactory deacidification effect and influence on product quality, and achieve the effect of good contact condition and fast deacidification time

Inactive Publication Date: 2004-11-24
EAST CHINA UNIV OF SCI & TECH +1
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The latter deacidification method artificially introduces impurities and affects product quality; while the first method has been proved to be unsatisfactory in deacidification effect

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Fluidizing gas (H 2 The volume ratio of air and air is 1:20) preheated to 600-700 ° C, and then passed through the ceramic ring evenly distributed to the fluidized section to the nano-SiO added from the upper part of the fluidized tower 2 Perform fluidized deacidification, the temperature of fluidized deacidification is 300°C, the fluidization gas velocity is 5cm / s, the fluidization expansion rate is 3, and the nano-SiO after fluidized deacidification for 30 minutes 2 The material is discharged from the outlet at the lower part of the fluidized tower for product analysis.

[0015] Product Analysis Results:

[0016] Before deacidification: nano-SiO 2 pH: 2.50, with H 2 O: 2.0%, specific surface area 201m 2 / g;

[0017] After deacidification: nano-SiO 2 pH: 4.19, containing H 2 O: 1.0%, specific surface area 200m 2 / g.

Embodiment 2

[0019] Fluidizing gas (H 2 The volume ratio of air and air is 1:10) preheated to 600-700 ° C, and then passed through the ceramic ring evenly distributed to the fluidized section to the nano-SiO added from the upper part of the fluidized tower 2 Carry out fluidized deacidification, the temperature of fluidized deacidification is 500°C, the fluidized gas velocity is 15cm / s, the fluidized expansion rate is 6, and the nano-SiO after fluidized deacidification for 90 minutes 2 The material is discharged from the outlet at the lower part of the fluidized tower for product analysis.

[0020] Product Analysis Results:

[0021] Before deacidification: nano-SiO 2 pH: 1.90, containing H 2 O: 4.6%, specific surface area 460m 2 / g;

[0022] After deacidification: nano-SiO 2 pH: 4.26, containing H 2 O: 2.0%, specific surface area 459m 2 / g.

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 deacidification method adopts the gas mixture obtained via hydrogen combustion as fluidizing gas to deacidify nano SiO2 inside the fluidizing reactor, with the fluidizing deacidification temperature being 300-500 deg.c, fluidizing gas speed being 2-15 cm / s, pH value of SiO2 after deacidification being greater than 4 and water content being lower than 2%.

Description

technical field [0001] The present invention relates to a kind of deacidification method, specifically, relate to a method for preparing nano silicon dioxide (SiO 2 ) deacidification method. Background technique [0002] Nano-SiO prepared by vapor phase method 2 It is a high-tech inorganic fine chemical product. Due to the unique properties of nanomaterials, it is widely used in many industrial fields such as rubber, coatings, adhesives, cosmetics, inks, plastics, and medicine. It has a very broad development prospect. of nanomaterials. [0003] Preparation of nano-SiO by vapor phase method 2 made of silicon tetrachloride (SiCl 4 ) is prepared through high-temperature hydrolysis reaction, and its reaction formula is as follows: [0004] <chemistry num="001"> <chem file="03116947_cml001.xml" / > < / chemistry> [0005] It can be seen from the above reaction formula that with SiO 2 At the same time, a large amount of hydrogen chloride (HCl) gas is prod...

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 Applications(China)
IPC IPC(8): C01B33/14C01B33/18
Inventor 干路平岳群丛德滋张祖钧李春忠蔡平雄毛英俊
Owner EAST CHINA UNIV OF SCI & TECH
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