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Type B Silica Gel

Type B Silica Gel

Type B Silica Gel

中文名:B型硅胶

Type B silica gel pore structure is between silochrom and fine-pored silica gel.

Mainly used for liquid absorbent, humidity regulator, desiccant, catalyst, catalyst carrier, spices carrier, silica sand, pet bedding, whitening agent and used as the raw material of chromatography silica gel and other fine chemical products.

Specifications

Item

Unit

Index

Appearance

milky white, transparent or translucent, pellets or lumps

Adsorption capacity

RH=20%

%

≥6

RH=50%

%

≥16

RH=90%

%

≥73

Loss on heating

%

≤3

Specific resistance

Ω.cm

≥4000

pH

5.5-7.5

6.5

Bulk density

g/L

510

Pore volume

ml/g

0.60-0.85

Average pore diameter

nm

4.5-7.0

Specific surface area

m2/g

450-650

Size: 0.5-1.5mm, 2-5mm, 3-5mm, 4-8mm

Packaging

20kg/ bag or 500kg/bag

Introduction

Silica gel is transparent or ivory-white granular solid, main ingredients are amorphous silica. Silica gel does not dissolve in water and any solvents, non-toxic tasteless, not burning. Silica gel has stable chemical properties, does not react with any material except strong alkali, hydrofluoric acid. Silica gel has open porous structure, high adsorption properties, good thermal stability, stable chemical properties, high mechanical strength, etc.

Added dilute sulfuric acid (hydrochloric acid) into the aqueous solution of sodium silicate and let standing, thus becoming solid aqueous silicate gel. Used water washing to remove Na+ and SO4 2- (Cl-) ions dissolved in the electrolyte, after drying it is silica gel. Different manufacturing methods form different microporous structure, different microporous structure form different models, such as macroporous silica gel, silochrom (type C silica gel), type B silica gel, fine-pored silica gel (type A silica gel).

Silica gel used for gas drying, gas absorption, liquid dehydration, chromatography, catalysts, etc.

Regeneration temperature

Silica gel can be removed moisture by the way of thermal desorption, desorption temperatures as follows:

Type C silica gel≤600℃

Type A silica gel≤200℃

Allochroic silica gel≤120℃

Silica alumina gel≤350℃