Crystallization of Pentaerythritol II. Model Experiments

1994 ◽  
Vol 59 (6) ◽  
pp. 1270-1278 ◽  
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.

Kinetics of secondary nucleation with attrition and the mean size of product crystals from the continuous stirred crystalliser

1981 ◽  
Vol 46 (1) ◽  
pp. 79-85 ◽  
Author(s):  
Jaroslav Nývlt
Keyword(s):  
Experimental Data ◽  
Kinetic Equation ◽  
Residence Time ◽  
Secondary Nucleation ◽  
Mixed Product ◽  
Product Removal ◽  
Mixed Suspension ◽  
Mean Size ◽  
The Mean ◽  
Kinetics Of

A form of kinetic equation of nucleation has been proposed expressing also the mechanism of attrition of crystals. In limiting cases this equation expresses the secondary nucleation due to attrition or caused by other mechanisms while both limit expressions are quite different. The resulting relation enables correlation of experimental data also in the case when it is not possible to neglect any of the mentioned phenomena. Relation has been derived for the mean size of product crystals from the MSMPR (mixed suspension, mixed product removal) crystalliser showing that in cases with the prevailing attrition of crystals it might be advantageous to operate at a larger crystalliser output i.e. with a shorter residence time of crystals in the unit.

scholarly journals Crystallization kinetics of ZnS precipitation; an experimental study using the mixed-suspension-mixed-product-removal (MSMPR) method

2004 ◽  
Vol 39 (8) ◽  
pp. 675-685 ◽  
Author(s):  
Mousa Al-Tarazi ◽  
A. Bert M. Heesink ◽  
Mohammed O. J. Azzam ◽  
Salah Abu Yahya ◽  
Geert F. Versteeg
Keyword(s):  
Experimental Study ◽  
Crystallization Kinetics ◽  
Mixed Product ◽  
Product Removal ◽  
Mixed Suspension ◽  
Kinetics Of

Analysis of the system precipitation reactor-separator. Effect of crystal growth mechanism on the filtration properties of a suspension produced in a continuous reactor

1985 ◽  
Vol 50 (9) ◽  
pp. 2053-2059 ◽  
Author(s):  
Otakar Söhnel
Keyword(s):  
Crystal Growth ◽  
Growth Mechanism ◽  
Solid Phase ◽  
Continuous Reactor ◽  
Mixed Product ◽  
Product Removal ◽  
Mixed Suspension ◽  
Crystal Growth Mechanism ◽  
Dependent Growth ◽  
Filtration Properties

The filtration properties of a suspension of a sparingly soluble substance produced in a MSMPR (mixed suspension mixed product removal) crystallizer with a mean residence time tz have been studied as a function of the crystal growth mechanism. The slope, n, of the log α vs log tz plot, where α is the specific mass filtration resistance, takes values of 0, 1, and 2 for the mononuclear, diffusion, and screw-dislocation mechanisms, respectively. If solid phase coagulation occurs, n takes values below 2. For the size-dependent growth, n may become greater than 2.

Control of Crystal Properties in a Mixed-Suspension Mixed-Product Removal Crystallizer: General Methods and the Effects of Secondary Nucleation

2019 ◽  
Vol 19 (5) ◽  
pp. 3070-3084 ◽  
Author(s):  
Dejiang Zhang ◽  
Xinyi Wang ◽  
Joachim Ulrich ◽  
Weiwei Tang ◽  
Shijie Xu ◽  
...  
Keyword(s):  
Secondary Nucleation ◽  
Mixed Product ◽  
Product Removal ◽  
Mixed Suspension ◽  
Crystal Properties

Determination of crystallization kinetics from batch experiments

1982 ◽  
Vol 47 (12) ◽  
pp. 3384-3392 ◽  
Author(s):  
Jaroslav Nývlt
Keyword(s):  
Kinetic Data ◽  
Batch Experiments ◽  
Mixed Product ◽  
Batch Crystallization ◽  
Product Removal ◽  
First Case ◽  
Mixed Suspension ◽  
Constant Rate ◽  
Relative Kinetic

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.

Sign in / Sign up

Export Citation Format

Share Document