Modeling, Operation and Optimization of Experimental Seeded Batch Crystallization of Adipic Acid
碩士 === 國立臺灣大學 === 化學工程學研究所 === 104 === Crystallization is a commonly used process for the production of pure substances or separating phases. Therefore, it is important to understand the characteristics of the crystallization process through kinetic considerations. General target of this thesis is t...
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ndltd-TW-104NTU050630972017-06-25T04:38:16Z http://ndltd.ncl.edu.tw/handle/79488775560908710033 Modeling, Operation and Optimization of Experimental Seeded Batch Crystallization of Adipic Acid 己二酸晶種式批次結晶槽之模擬、操作及最適化 Hung-Chih Cho 卓竑志 碩士 國立臺灣大學 化學工程學研究所 104 Crystallization is a commonly used process for the production of pure substances or separating phases. Therefore, it is important to understand the characteristics of the crystallization process through kinetic considerations. General target of this thesis is the experimental examination of the batch-wise crystallization process of adipic acid in water and the determination of relevant kinetic parameters. In this work, a seeded batch crystallization experiment was developed to go through several operation policies. The experiment data at different experimental conditions were collected and were used to determine the kinetic parameters of crystal growth rate and crystal nucleation rate. Then the experiment was made use of investigate the effect of cooling trajectory and seed properties on the product crystal quality and crystal size distribution. In results, compare to the effect on the crystal size distribution between different seed loading and different temperature trajectories, to change the seed loading ratio is a more effective way to suppress nucleation and obtain better product equality. For a given seed loading, linear trajectory perform significantly worse than convex trajectories such as cubic, quartic, and Mullin-Nvylt trajectories. The performance of optimal trajectory is the best. Finally the experiment was used to test the phenomena proposed, which are called ‘early growth’ trajectories and ‘late growth’ trajectories. The ‘early growth’ trajectories give the larger supersaturation in the beginning of the batch than the end of the batch, which will produce a larger number of nuclei but a smaller nucleation mass. In contrast, ‘late growth’ trajectories give the smaller supersaturation in the beginning of the batch than the end of the batch, and it will produce a larger number of nuclei but a smaller nucleation mass. The results confirmed the theoretical prediction to be consistent again. Jeffrey D,Ward 吳哲夫 2016 學位論文 ; thesis 92 en_US |
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碩士 === 國立臺灣大學 === 化學工程學研究所 === 104 === Crystallization is a commonly used process for the production of pure substances or separating phases. Therefore, it is important to understand the characteristics of the crystallization process through kinetic considerations. General target of this thesis is the experimental examination of the batch-wise crystallization process of adipic acid in water and the determination of relevant kinetic parameters.
In this work, a seeded batch crystallization experiment was developed to go through several operation policies. The experiment data at different experimental conditions were collected and were used to determine the kinetic parameters of crystal growth rate and crystal nucleation rate. Then the experiment was made use of investigate the effect of cooling trajectory and seed properties on the product crystal quality and crystal size distribution.
In results, compare to the effect on the crystal size distribution between different seed loading and different temperature trajectories, to change the seed loading ratio is a more effective way to suppress nucleation and obtain better product equality. For a given seed loading, linear trajectory perform significantly worse than convex trajectories such as cubic, quartic, and Mullin-Nvylt trajectories. The performance of optimal trajectory is the best.
Finally the experiment was used to test the phenomena proposed, which are called ‘early growth’ trajectories and ‘late growth’ trajectories. The ‘early growth’ trajectories give the larger supersaturation in the beginning of the batch than the end of the batch, which will produce a larger number of nuclei but a smaller nucleation mass. In contrast, ‘late growth’ trajectories give the smaller supersaturation in the beginning of the batch than the end of the batch, and it will produce a larger number of nuclei but a smaller nucleation mass. The results confirmed the theoretical prediction to be consistent again.
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author2 |
Jeffrey D,Ward |
author_facet |
Jeffrey D,Ward Hung-Chih Cho 卓竑志 |
author |
Hung-Chih Cho 卓竑志 |
spellingShingle |
Hung-Chih Cho 卓竑志 Modeling, Operation and Optimization of Experimental Seeded Batch Crystallization of Adipic Acid |
author_sort |
Hung-Chih Cho |
title |
Modeling, Operation and Optimization of Experimental Seeded Batch Crystallization of Adipic Acid |
title_short |
Modeling, Operation and Optimization of Experimental Seeded Batch Crystallization of Adipic Acid |
title_full |
Modeling, Operation and Optimization of Experimental Seeded Batch Crystallization of Adipic Acid |
title_fullStr |
Modeling, Operation and Optimization of Experimental Seeded Batch Crystallization of Adipic Acid |
title_full_unstemmed |
Modeling, Operation and Optimization of Experimental Seeded Batch Crystallization of Adipic Acid |
title_sort |
modeling, operation and optimization of experimental seeded batch crystallization of adipic acid |
publishDate |
2016 |
url |
http://ndltd.ncl.edu.tw/handle/79488775560908710033 |
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