Silica gel desiccant chemical properties and chemical use

Silica gel desiccant chemical properties and chemical use

Amorphous silica gel desiccant with a porous amorphous structure , does not have any x-ray diffraction in the external structure of silica gel chromatography, and industrial water treatment category . There is the appearance of silica gel desiccant silanol groups and siloxane bond disclosure silanol groups are strongly adsorbed polar groups , and siloxane bond is a hydrophobic group . Siloxane bond by the action of a key on the enhanced oxygen atom lone pair of electrons involved in the role of the donor can not participate in the interaction between the receptor does not constitute hydrogen .

However, due to the hydrophobic interaction of the siloxane bond , some non- polar solvent capable of adsorbing molecules. On silicone modified , the silanol critical than siloxane much . Silanol groups can be isolated and paired twins and association vicinal exist in different ways, such as silica gel desiccant appearance. Recently study indicated , only the association of two or more silanol groups can form an aggregate bonding pair, and even pairs of silanol groups can be bonded to form pairs.

Silicone exterior structure determination can be implemented through a number of ways . Under normal circumstances , with the appearance of the plot than the growth of the appearance of silica gel desiccant concentration of silanol groups decreased slightly . Determination of alcohol content is usually silicon isotope exchange method method, titration, spectroscopy and aluminum alkyl law.

Chemical stability , an important component of silica gel desiccant is silica. Does not go out . Silica gel desiccant is an amorphous silica dust content of the workshop should be controlled to less than 10 mg / m need for increased ventilation, wear a mask when operating . On human skin can occur boring role , silica gel desiccant has a strong adsorption ability. Therefore, the operator should wear good clothes tasks . If silica gel desiccant into the eyes , need a small amount of water and seek medical treatment.
Toxic blue silica gel desiccant because it contains a large number of cobalt chloride . Should be prevented and food contact and inhalation of the mouth , such as intoxication things should immediately seek medical treatment.

When the adsorption decreased , silica gel desiccant in the use of the process of the medium due to the adsorption of water vapor or other inorganic substances. Can be regenerated after repeated use . Gas parting and pollution of the high skill, silica gel desiccant PSA translucent or semi- translucent appearance glassy . PSA silica gel desiccant is important for the recovery of carbon dioxide , respectively, and pollution , for the decomposition of ammonia industry , food and beverage processing industry , etc. Preparation of carbon dioxide can be used for dry, dehydrated moisture and inorganic products such as refining .