SELECTIVE WATER SORBENTS FOR MULTIPLE APPLICATIONS .3. CACL2 SOLUTIONCONFINED IN MICROPOROUS AND MESOPOROUS SILICA-GELS - PORE-SIZE EFFECTON THE SOLIDIFICATION-MELTING DIAGRAM

In this communication we present a low-temperature ''solidification-me lting'' phase diagram for CaCl2/H2O solutions confined in KSK and KSM silica gels. At salt concentrations of 0-48 wt.%, the diagram has been found to he below the diagram reported for the bulk system by 15-30 d egrees C. It shows a depression of the solution melting point due to i ts confinement to the pores. Several other peculiarities of melting an d solidification in this system are also reported and discussed. Besid e fundamental interest, the data obtained could be of importance in ma ny commercial areas such as refrigeration, accumulation of low tempera ture heat, frost prevention in building materials, etc.