Desiccant

摘要

A process for producing a desiccant for HFC-32, HFC-152a and mixed refrigerants which contain HFC-32 and/or HFC-152a comprises immersing mouldings of a zeolite of type 3A, in which 20 to 60%, expressed as ion-equivalent mass, of sodium ions have been replaced by potassium ions, in an aqueous solution of at least one member selected from the group consisting of sodium silicate and potassium silicate, as a result of which SiO2 is deposited on the mouldings, removing the SiO2-coated mouldings from the aqueous solution, drying the wet mouldings and subsequently activating the dry mouldings. A desiccant for HFC-32, HFC-152a and mixed refrigerants which contain HFC-32 and/or HFC-152a is also provided which was prepared by this process.