What Are Desiccators?

Desiccants refer to substances that can remove moisture from moist substances. They are usually divided into two categories: chemical desiccants, such as calcium sulfate and calcium chloride, which are dried by combining with water to form hydrates; physical desiccants, such as silica gel and Alumina and the like are dried by physically adsorbing water.

Medicine and health products, biological reagents, food industry-specific desiccant. Special desiccant features: high hygienic requirements, packaging materials passed the US FDA demonstration, the product is small and efficient, delicate and environmentally friendly, has good compatibility and chemical stability.
According to the application environment, there are generally three cases:
(1) Use in a small environment: The desiccant is placed directly in a bottle, can or other closed small bag to keep the items in the small environment dry.
(2) Use in the middle environment: The desiccant is used directly in the packaged carton (or packaging barrel, bag) to prevent the items in the package from getting wet.
(3) Use in the large environment: The desiccant is directly used in similar warehouses and containers to achieve the purpose of controlling the humidity in the large environment. [1]
name
Chemical formula
Water absorption capacity
Drying speed
Acidity
Regeneration method
Calcium sulfate
CaSO 4
small
fast
neutral
Drying and regeneration at 163
Barium oxide
BaO
-
slow
Alkaline
Cannot reproduce
Phosphorus pentoxide
P 2 O 5
Big
fast
Acidic
Cannot reproduce
Calcium chloride (fused)
CaCl 2
Big
fast
neutral
200 drying regeneration
Magnesium perchlorate
Mg (ClO 4 ) 2
Big
fast
neutral
Dry regeneration (decomposed at 251 ° C)
Potassium hydroxide (fused)
KOH
Big
fast
Strong alkaline
Cannot reproduce
Alumina
Al 2 O 3
Big
fast
neutral
110 300 drying and regeneration
Concentrated sulfuric acid
H 2 SO 4
Big
fast
Strong acidity
Evaporation and concentration regeneration
Silica gel
SiO 2
Big
fast
Acidic
Drying at 120
Sodium hydroxide (fused)
NaOH
Big
fast
Strong alkaline
Cannot reproduce
Calcium Oxide
CaO
-
slow
Alkaline
Cannot reproduce
Activated anhydrous copper sulfate
CuSO 4
Big
-
Weakly acidic
150 drying regeneration
Magnesium sulfate
MgSO 4
Big
fast
Weakly acidic
200 drying regeneration
Sodium sulfate
Na 2 SO 4
Big
slow
neutral
Dry regeneration
Potassium carbonate
K 2 CO 3
in
slow
Alkaline
100 drying regeneration
Sodium metal
Na
-
-
Alkaline
Cannot reproduce
Note: Be careful when using perchlorate. Carbon, sulfur, phosphorus, and all organic matter must not be in contact with it. Otherwise, a violent explosion will occur, causing danger. [4]

IN OTHER LANGUAGES

Was this article helpful? Thanks for the feedback Thanks for the feedback

How can we help? How can we help?