NEWS

Hangzhou Golden Lily Non-woven Cloth Co., Ltd.


02

2022

-

03

Types Of Desiccants

Author:


Jul 25, 2019

Desiccant refers to the substances that can remove the moisture in the moist substances, usually divided into two categories: chemical desiccant, such as calcium sulfate and calcium chloride, etc., by combining with water to form hydrate for drying;Physical desiccant, such as silica gel and activated alumina, is dried by physical adsorption of water.

Name

Chemical formula

water absorbing capacity

drying rate

acid-base property

Regenerative way

calcium sulfate

CaSO4

bad

fast

neutral

Regeneration after 163℃ drying

phosphorus pentoxide

P2O5

good

fast

acidity

nonrenewable

Calcium chloride

CaCl2

good

fast

neutral

Regeneration after 200℃ drying

Dehydrite

Mg(ClO4)2

good

fast

neutral

Regeneration after drying

potassium hydroxide

KOH

good

fast

strong basicity

nonrenewable

aluminium oxide

Al2O3

good

fast

neutral

Regeneration after 110-300℃ drying

concentrated sulfuric acid

H2SO4

good

fast

Strong acidity

Evaporation concentration regeneration

silica gel

SiO2

good

fast

acidity

Regeneration after 120℃ drying

sodium hydroxide

NaOH

good

fast

strong basicity

nonrenewable

calcium oxide

CaO

/

slow

basicity

nonrenewable

Active anhydrous copper sulfate

CuSO4

good

/

weak acidity

Regeneration after 150℃ drying

magnesium sulfate

MgSO4

good

fast

weak acidity

Regeneration after 200℃ drying

sodium sulfate

Na2SO4

good

slow

neutral

Regeneration after drying

potassium carbonate

K2CO3

common

slow

basicity

Regeneration after 100℃ drying

metallic sodium

Na

/

/

basicity

nonrenewable

 

image001

image003