期刊
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
卷 50, 期 23, 页码 13561-13567出版社
AMER CHEMICAL SOC
DOI: 10.1021/ie201040y
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资金
- NSFC [21176219]
- National High-Tech R&D Program of China [2006AA03Z385]
- Ministry of Education, China
Through vapor pressure measurements, water activities of the glycerol water solution were first examined under temperatures of 30-85 degrees C and glycerol concentrations of 0-50 mol %. The water activity is the only determinant of phase-transition point among CaSO4 center dot 2H(2)O (DH), alpha-CaSO4 center dot 0.5H(2)O (alpha-HH), and CaSO4 (AR) in glycerol water solution. Accordingly, a phase-transition diagram was constructed as a function of temperature (0-140 degrees C) and glycerol concentration (0-50 mol %), which provided a thermodynamic preparation window of alpha-HH from DH. Controlling glycerol concentration and temperature within the window, direct transition of DH to alpha-HH can be regulated. However, the window is apt to shrink as the operating time is shortened, indicating that its available profile is directed by transition kinetics of DH to alpha-HH besides transition thermodynamics. Overall, the glycerol water solution could act as a novel category of nonelectrolyte medium for alpha-HH preparation from DH.
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