Determination of crystallization kinetics from batch experiments

Three types of batch crystallization model experiments are considered: a) crystallization in which a constant supersaturation is maintained throughout the experiment (e.g. by programmed cooling); b) crystallization during which supersaturation is produced at a constant rate; c) crystallization (e.g. by precipitation) in which an initial supersaturation produced at the beginning gradually decreases during the run. The kinetic data obtained in the first case are of the same kind as those obtained in a continuous MSMPR (mixed suspension - mixed product removal) crystallizer. The two remaining types of experiment, on the other hand, can only provide relative kinetic data with respect to a reference run.

Download Full-text

Determination of crystallization kinetics from batch experiments II

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19832767 ◽

1983 ◽

Vol 48 (10) ◽

pp. 2767-2776 ◽

Cited By ~ 2

Author(s):

Jaroslav Nývlt ◽

Stanislav Žáček

Keyword(s):

Crystal Growth ◽

Size Distribution ◽

Crystallization Kinetics ◽

Kinetic Data ◽

Batch Experiments ◽

Aluminium Sulphate ◽

Batch Crystallization ◽

Relative Kinetic ◽

Crystal Product

Relations have been derived for the size distribution of crystal product of batch crystallization with constant and variable supersaturation, applicable where the distribution cannot be approximated by the relation holding for continuous MSMPR crystallizers. In the cases considered, relative kinetic data, but not the kinetic exponents of nucleation and crystal growth, can be evaluated for model experiments involving any variation of supersaturation with time. Application of the relationships is illustrated by treating data for potassium aluminium sulphate precipitation.

Download Full-text

Mixed suspension - mixed product removal crystallization kinetics: Effect of the method of supersaturation generation

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19870072 ◽

1987 ◽

Vol 52 (1) ◽

pp. 72-80 ◽

Cited By ~ 3

Author(s):

Stanislav Žáček ◽

Jaroslav Nývlt ◽

John William Mullin

Keyword(s):

Kinetic Data ◽

Crystal Size ◽

Crystallization Kinetic ◽

Alcohol Concentration ◽

Aluminium Sulphate ◽

Salting Out ◽

Mixed Product ◽

Continuous Crystallization ◽

Product Removal ◽

Mixed Suspension

Three methods of continuous crystallization of potassium aluminium sulphate have been compared: crystallization by cooling, precipitation from solutions of component salts (potassium sulphate and aluminium sulphate) and salting-out with ethanol. Crystal size distribution of the products has been used to obtain crystallization kinetic data in two parallel ways, viz. using the concept of population balance and that of mass oversize distribution, both of which led to similar conclusions. The results of cooling and precipitation are comparable, but crystallization by salting-out with ethanol leads to smaller crystals and the results strongly depend on the alcohol concentration, which can be explained by the influence of micromixing.

Download Full-text

Crystallization of Pentaerythritol II. Model Experiments

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19941270 ◽

1994 ◽

Vol 59 (6) ◽

pp. 1270-1278 ◽

Cited By ~ 3

Author(s):

Miloslav Karel ◽

Jaroslav Nývlt ◽

Angelo Chianese

Keyword(s):

Crystal Growth ◽

Laboratory Experiments ◽

Secondary Nucleation ◽

Mixed Product ◽

Model Experiments ◽

Product Removal ◽

Mixed Suspension ◽

Kinetics Of ◽

Kinetics Of Crystal Growth

Kinetics of crystallization of the pentaerythritol has been determined in laboratory experiments: MSMPR (Mixed Suspension Mixed Product Removal) crystallizer experiments served for determination of the kinetics of secondary nucleation and of the kinetics of crystal growth.

Download Full-text