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Citation: ZHU Zhi-Liang, ZHANG Bing-Ru, LI Ji-Wen, SU Yao-Dong, NI Ya-Ming. Kinetic Study of Induction Periods of Calcium Sulfate Crystal Formation in Presence of Scale Inhibiting Agents[J]. Chinese Journal of Applied Chemistry, ;2001, 18(3): 192-195. shu

Kinetic Study of Induction Periods of Calcium Sulfate Crystal Formation in Presence of Scale Inhibiting Agents

1.
Department of Chemistry, Tongji University, Shanghai 200092

Received Date: 20 June 2000
Available Online: 21 November 2000
Fund Project:

The dynamic growth process of CaSO₄·2H₂O crystal was studied by seeded crystallization of the supersaturated solution.The induction periods of CaSO₄·2H₂O crystal under the condition of adding nine different scale inhibitors have been determined.It was found that PAA and PMAAA had a better inhibiting action to the scale formation of calcium sulfate.The higher solution pH and the lower solution temperature,the higher their inhibition ability.The PAA or PMAAA of lower molecular weight showed much higher inhibiting ability.It has been demonstrated that the possible mechanism of scale inhibition is the adsorption of inhibitors on the active sites of the surfaces of crystal CaSO₄·2H₂O.The adsorption of PAA and PMAAA on the crystal surfaces accorded with the characters of Langmuir model.
- calcium sulfate,
- crystal growth,
- inhibition action,
- scale inhibitor,
- polyacrylic acid,
- poly (maleic acid-co-acrylic acid)
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