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51315-5770-Impact of Monoethylene Glycol and Fe²+ on Crystal Growth of CaCO4

Product Number: 51315-5770-SG
ISBN: 5770 2015 CP
Author: Marion Seiersten
Publication Date: 2015
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Calcium carbonate is one of the most abundant minerals forming scale or dispersed particles when brine is produced with the gas. When Monoethylene Glycol (MEG) is used as hydrate inhibitor it affects the precipitation of CaCO?. The solubility changes and MEG has a large impact on the precipitation kinetics. The presence of other divalent cations has a further influence the nucleation and growth rates of the CaCO3 polymorphs. The effect of ferrous (Fe²?) has been studied at 25-80°C with MEG concentration up to 90 wt%.The induction time for precipitation for the CaCO? polymorph vaterite is significantly increased when the solution contains 1-4 ppm Fe²?. The lower precipitation rate is a result of retarded crystal growth and not reduced nucleation rate. The growth rates at conditions similar to the MEG injection point were measured and found retarded by up to ~90% with 4 ppm Fe²? present. The effect is comparable in solutions with and without MEG. Ferric iron does not retard the growth rate of vaterite to the same extent as ferrous iron.

Calcium carbonate is one of the most abundant minerals forming scale or dispersed particles when brine is produced with the gas. When Monoethylene Glycol (MEG) is used as hydrate inhibitor it affects the precipitation of CaCO?. The solubility changes and MEG has a large impact on the precipitation kinetics. The presence of other divalent cations has a further influence the nucleation and growth rates of the CaCO3 polymorphs. The effect of ferrous (Fe²?) has been studied at 25-80°C with MEG concentration up to 90 wt%.The induction time for precipitation for the CaCO? polymorph vaterite is significantly increased when the solution contains 1-4 ppm Fe²?. The lower precipitation rate is a result of retarded crystal growth and not reduced nucleation rate. The growth rates at conditions similar to the MEG injection point were measured and found retarded by up to ~90% with 4 ppm Fe²? present. The effect is comparable in solutions with and without MEG. Ferric iron does not retard the growth rate of vaterite to the same extent as ferrous iron.

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