A simple but sound approach for processing crystal growth kinetic data

作者：Khaddour Issam^*; Martins Fernando; Rocha Fernando

来源：Chemical Engineering Research and Design, 2011, 89(10A): 2049-2053.

DOI：10.1016/j.cherd.2010.12.014

• Sucrose
• Growth
• Rate
• Mechanism
• Data smoothing

The effects of common data smoothing techniques, on the estimating of the kinetic and thermodynamic parameters of the crystal growth process, were discussed in the light of birth and spread model. Adoption of the moving average, and filtration caused a noticeable misunderstanding of the real ruling growth mechanism, especially, during the early period of the crystal growth.
In this work, a MATLAB routine was developed with standard, and reliable method to treat the prolonged concentration-time data sets, as obtained from continuous recording of refractometric degrees Brix readings of pure sucrose solutions in laboratory batch crystallization process. The method consists of finding the median of the residence time for every degrees Brix concentration, with and without interference of previous and post readings. In addition to 30% reduction in the evaluated interfacial free energies, up to 5-folds of increase in the estimates of the overall kinetic coefficients were reported using the common smoothing techniques instead of the proposed routine.

• 出版日期2011-10