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Calcium Carbonate Scale Formation in Water- Monoethylene Glycol (MEG)

The influence of mono ethylene glycol (MEG) on the precipitation of calcium carbonate was investigated at constant supersaturation 25oC pH 8.5. Both seeded and unseeded experiments were done in aqueous supersaturated calcium carbonate solutions containing MEG over the concentration range 0-80 % v/v. The presence of MEG affected the induction times and the subsequent rates of precipitation in unseeded spontaneous precipitation of calcium carbonate. At low values of the supersaturation ratio (SRcalcite=19.95-60.26) and for MEG concentrations in the range 30-80% v/v the solutions were stable for four days. At lower than 30% v/v MEG concentrations calcium carbonate precipitation took place past induction periods between 160-500min. The morphological examination of the precipitates showed that in the presence of low MEG concentrations (10-20 % v/v) precursor vaterite was stabilized. The homogeneous nucleation and growth of calcium carbonate in the absence and in the presence of MEG was also investigated by the inoculation of stable supersaturated solutions with quartz and calcite seed crystals. In both cases nucleation and growth of calcium carbonate was significantly reduced with increasing MEG concentration in the solutions.

Product Number: 51319-12817-SG
Author: Petros Koutsoukos
Publication Date: 2019
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