Polyelectrolytes inhibition effect on crystallization of gypsum by Ö. Dogan, E. Akyol, and M. Öner

Crystal Research and Technology

Cryst. Res. Technol. 39, 1108 (2004) - Abstract -

Polyelectrolytes inhibition effect on crystallization of gypsum

Ö. Dogan, E. Akyol, and M. Öner

Yildiz Technical University, Chemical Engineering Department, Davutpasa 34210 Istanbul, Turkey

Keywords	crystal growth inhibition, gypsum precipitation, habit modification, polyelectrolytes
PACS	81.10.-h
DOI	10.1002/crat.200410297

The spontaneous precipitation of calcium sulfate dihydrate (gypsum) at 30 °C was investigated in the presence of polyelectrolytes. The degree of inhibition is measured as the reduction in initial crystallization rate, determined by conductivity of the crystallizing solution. The inhibition increases with acid content of the copolymer. Changing the butyl ester to a hydrophilic ethylene oxide resulted in higher inhibition efficiency. The inhibition efficiency is believed to arise from the closer chain packing on the crystal surface.

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