Abstract
The solubility of the quaternary system sodium carbonate + ethanol + hydrogen peroxide + water was determined at 293.15 K using Schreinemaker's wet residue method. The phase diagram was constructed according to the Jãneck method. There were three solid phases formed in the quaternary system, which corresponded to Na2CO3·10H2O, Na2CO3·1.5H2O2·H2O, and Na2CO3·2H2O2·H2O. The crystalline region of Na2CO3·1.5H2O2·H2O was larger than that of the other two solids, Na2CO3·10H2O and Na2CO3·2H2O2·H2O. Adding the ethanol into the Na2CO3 + H2O2 + H2O system could promote further crystallization and recover a greater fraction of Na2CO3·1.5H2O2·H2O. The concentrations of sodium carbonate and hydrogen peroxide in the mother liquor after separation from Na2CO3·1.5H2O2·H2O would be lowered as a result of the presence of ethanol. The solubility data and the phase diagram of the quaternary system could provide the fundamental basis and serve as a guide for the preparation of sodium percarbonate.
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