Selection of threshold agents for calcium sulfate scale control on the basis of chemical structure |
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| Authors: | S Sarig F Kahana R Leshem |
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| Affiliation: | The Casali Institute of Applied Chemistry, The Hebrew University of Jerusalem Israel |
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| Abstract: | The effects of polyvinyl sulfonate (PVS) and polyglutamic acid (PGA) on the precipitation of 2CaSO4· H2O and CaSO4 · 2H2O were compared. PGA strongly retards CaSO4 · 2H2O precipitation from sea water, and also significantly changes its crystal habit. PVS has a similar effect on 2CaSO4 · H2O precipitated at ca. l00°C. The selectivity is related to structural compatibility between the additive and the crystal lattice. A possible mechanism of heterogeneous nucleation of the two crystallographic species upon the suitable polymers is proposed. The hardening of scale in the presence of an unsuitable additive is explained within the framework of the proposed mechanism. |
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