What are solid desiccants

Introduction: common solid desiccants mainly include calcium oxide, calcium chloride and silica gel, as well as activated alumina and zeolite, which are all fixed desiccants Often eat small food friends, will find in the small food there will be desiccant, this desiccant is mainly to prevent the occurrence of food moisture, can maintain the drying of food The application of desiccant is more extensive, so there will be more types of desiccant, so today's small edition of Baibai safety net will introduce the solid desiccant in detail for you, which can make you pay more attention to desiccant 1 Anhydrous calcium chloride: it is widely used because of its low price and strong drying ability Fast drying speed, regeneration, dehydration temperature 473k It can not be used to dry ammonia, aldehyde, ester, etc 2 Anhydrous magnesium sulfate: it has a strong drying ability and generates mgso4.7h2o after absorbing water It is a good desiccant with rapid water absorption, high efficiency and low price It is often used to dry organic reagents 3 Solid sodium hydroxide and alkali lime: it is an excellent desiccant with fast water absorption, high efficiency and low price, but it can not be used to dry acid substances, such as CO2, H2S and SO2 4 Discolored silica gel: commonly used to keep the instrument and balance dry It turns red after absorbing water The invalid silica gel can be reused after drying and regeneration Dry amine, NH3, O2, N2, etc 5, active alumina (Al2O3): large water absorption, fast drying speed, regeneration (400-500k baking) 6 Anhydrous sodium sulfate: the drying temperature must be controlled within 30 ℃, and the dryness is worse than anhydrous magnesium sulfate 7 Calcium sulfate: it can dry H2, O2, CO2, Co, N2, Cl2, HCl, H2S, NH3, CH4, etc Desiccant refers to the material that can remove part of the moisture in the wet material For example, calcium sulfate and calcium chloride are combined with water to form hydrate for drying; physical desiccants, such as silica gel and active alumina, are dried by physically adsorbed water The control of moisture is closely related to the yield of the product In terms of food, under the appropriate temperature and humidity, the bacteria and mold in the food will propagate at an amazing speed, making the food rotten, causing moisture and color change Electronic products will also cause metal oxidation due to high humidity, resulting in poor performance The use of desiccant is to avoid the occurrence of defective products caused by excessive water To sum up, "what are the solid desiccants?" I'll talk about it today During the use of the dryer, we must pay more attention Because some friends have also heard some news about the explosion of the desiccant, we must properly deal with it in the process of contacting the desiccant to avoid the explosion of the desiccant To learn more about food additives and food safety, you can directly log in to Baibai safety net Editor in charge: he xianrob