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Molecular sieves are those types of desiccants that have almost the same appearance as silica gel but have different, completely different properties compared to silica gel. This desiccant is produced synthetically with the help of metal amino silicates. Molecular sieves are safe to use with food items as it is nontoxic but, at the same time, highly porous. It appears to have a pinkish color, tiny opaque beads which have several internal cavities connected with the help of internal window openings. All the windows are of similar diameter. Diameter plays an important role in the working of molecular sieves. Its accurate diameter is the unique identification that differentiates it from the other desiccants. Different types of Molecular sieves are 3A, 4A, 5A, 13X. So, if the molecules of the elements have a smaller diameter than the window opening of the desiccant, the process of absorption happens. Otherwise, it will not.

As it has a high network of pores, Molecular sieves can be the ultimate source of moisture absorption. This feature makes it demanding in the industrial sector. This absorbent is synthetically produced from Zeolite and has innumerable internal cavities, which absorb moisture and lock it inside them. These desiccants can either be used individually, or you also have the option to use them in combination with other desiccants; in this way, you can get an optimal solution. Different types of desiccants have different types of absorbing qualities. In the case of molecular sieves, they can absorb moisture or gas up to 20 times their weight. Since it is one of the most effective and aggressive absorbents available, it costs slightly higher than the other desiccants. This desiccant is used in various organizations like the pharmaceutical and medical industry, the food, and refrigeration industry, and the cosmetics and petroleum industry. It is also widely used in the electronic and computer industry.  

The other type of desiccant is dehydrated ethanol. Ethanol dehydration means a process where the water molecules or something equivalent to water molecules is removed from the substance. Ethane and water are produced by dehydrating ethanol by heating it over a certain temperature with sulfuric acid. The vapors of ethanol can be easily dehydrated, bypassing any heated catalyst, which will produce methane gas. This process is also called ethanol drying.Sorbead India's molecular sieve 3A used for ethanol purification in PSA plants.