碳酸钙
化学
吸附
降水
成核
聚天冬氨酸
钙
碳酸盐
化学工程
无机化学
矿物学
有机化学
原材料
气象学
物理
工程类
作者
Norinda Chhim,Elsi Haddad,Thibaut Neveux,C. Bouteleux,Sébastien Teychené,Béatrice Biscans
出处
期刊:Water Research
[Elsevier]
日期:2020-11-01
卷期号:186: 116334-116334
被引量:14
标识
DOI:10.1016/j.watres.2020.116334
摘要
Cooling circuits in many industrial sectors are faced with daily issues of scaling. One preventive treatment consists in injecting a polymer additive in the circuit to inhibit precipitation of calcium carbonate. Among the used additives, very few are "green" and the efficiency of new candidates are difficult to test directly in industrial conditions. The present study compared performance between two "green" polymer additives, polyaspartic acid (PASP) and polyepoxysuccinic acid (PESA), versus a traditional gold-standard, homopolymer of acrylic acid (HA) in a laboratory scale set-up designed to be representative of an industrial circuit. Results showed that HA and PASP are both inhibitors of calcium carbonate crystal growth. This inhibition resulted from adsorption of polymer additive molecules on the crystal surface, as confirmed by adsorption measurement. Under the same conditions, PESA additive, showed a high rate of calcium ion complexation and a very low inhibition rate. But, PESA was shown to be a nucleation delayer. Mixing PESA and PASP can gave nucleation retardation of about 19 h, which approximates the 24 h water residence time in industrial cooling circuits, as well as almost 90% calcium carbonate crystal growth inhibition. This synergy offers promising prospects for preventive scaling treatment.
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