Evaluation of controlled cooling for seeded batch crystallization incorporating dissolution

Crystallization is an essential solid-liquid separation technique which is widely used in the industry such as in pharmaceuticals, pigments, food, plastics, semi-conductors and others due to its capability to produce high quality of crystals. The final specification of the crystal product usually is...

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Main Authors: Siti Zubaidah, Adnan, Suriyati, Saleh, Noor Asma Fazli, Abdul Samad
Format: Conference or Workshop Item
Language:English
Published: AIP Publishing LLC. 2019
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Online Access:http://umpir.ump.edu.my/id/eprint/25821/2/Evaluation%20of%20controlled%20cooling%20for%20seeded%20batch%20crystallization%20incorporating%20dissolution.pdf
http://umpir.ump.edu.my/id/eprint/25821/
https://doi.org/10.1063/1.5117102
https://doi.org/10.1063/1.5117102
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spelling my.ump.umpir.258212019-11-22T07:39:17Z http://umpir.ump.edu.my/id/eprint/25821/ Evaluation of controlled cooling for seeded batch crystallization incorporating dissolution Siti Zubaidah, Adnan Suriyati, Saleh Noor Asma Fazli, Abdul Samad TP Chemical technology Crystallization is an essential solid-liquid separation technique which is widely used in the industry such as in pharmaceuticals, pigments, food, plastics, semi-conductors and others due to its capability to produce high quality of crystals. The final specification of the crystal product usually is given in terms of crystal size distribution (CSD), shape and purity. However achieving the target CSD for the case of batch seeded cooling crystallization is always a challenge due to the limited control on the production of fine crystals. Generally crystallization process is controlled to be operated in the metastable zone where the crystal particles will grow until the end of the operation. If the crystallization process is operated beyond the metastable concentration, excessive nucleation is expected due to the high supersaturation. As a consequence the target crystal product is able to achieve but there is unnecessary amount of fine crystals by the end of the operation. This unnecessary nucleation can be reduced by incorporating the crystallization process with dissolution phenomena where the temperature of the solution is controlled so that the solution is operated in the undersaturated condition. This condition is enabling the grown crystal particles to dissolve back into solution. Thus reducing the amount of fine crystals in the overall CSD. Therefore the objective of this study is to develop and evaluate controlled cooling for batch seeded crystallization of potassium nitrate incorporating dissolution phenomena. The mathematical model for potassium nitrate crystallization is developed and simulated in MATLAB software where it is validated against experimental data. The optimization algorithm is then developed in order to determine the set-point trajectory for closed­ loop control. Based on this optimal trajectory a closed-loop control is proposed to maintain the crystallization operation at its set-point using two types of controller which consists of Proportional (P) and Proportional-Integral (PI) controllers. Two important criteria are measured in the closed-loop simulation which are the performance of PI controller to follow the given set-point trajectory and the achievement of target CSD. Based on the closed-loop control it is shown that the PI control is more superior than P control by maintaining the operation at its set-point and successfully achieved the desired CSD. In addition the production of fines particle is greatly reduced indicating this new optimal trajectory is capable of producing the target CSD and minimizes the effects of nucleation. AIP Publishing LLC. 2019-07-24 Conference or Workshop Item PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/25821/2/Evaluation%20of%20controlled%20cooling%20for%20seeded%20batch%20crystallization%20incorporating%20dissolution.pdf Siti Zubaidah, Adnan and Suriyati, Saleh and Noor Asma Fazli, Abdul Samad (2019) Evaluation of controlled cooling for seeded batch crystallization incorporating dissolution. In: 6th International Conference on Environment: Empowering Environment and Sustainable Engineering Nexus Through Green Technology, ICENV 2018, 11 - 13 Disember 2018 , Penang, Malaysia. pp. 1-9., 2124. ISSN 0094243X ISBN 978-073541864-6 https://doi.org/10.1063/1.5117102 https://doi.org/10.1063/1.5117102
institution Universiti Malaysia Pahang
building UMP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang
content_source UMP Institutional Repository
url_provider http://umpir.ump.edu.my/
language English
topic TP Chemical technology
spellingShingle TP Chemical technology
Siti Zubaidah, Adnan
Suriyati, Saleh
Noor Asma Fazli, Abdul Samad
Evaluation of controlled cooling for seeded batch crystallization incorporating dissolution
description Crystallization is an essential solid-liquid separation technique which is widely used in the industry such as in pharmaceuticals, pigments, food, plastics, semi-conductors and others due to its capability to produce high quality of crystals. The final specification of the crystal product usually is given in terms of crystal size distribution (CSD), shape and purity. However achieving the target CSD for the case of batch seeded cooling crystallization is always a challenge due to the limited control on the production of fine crystals. Generally crystallization process is controlled to be operated in the metastable zone where the crystal particles will grow until the end of the operation. If the crystallization process is operated beyond the metastable concentration, excessive nucleation is expected due to the high supersaturation. As a consequence the target crystal product is able to achieve but there is unnecessary amount of fine crystals by the end of the operation. This unnecessary nucleation can be reduced by incorporating the crystallization process with dissolution phenomena where the temperature of the solution is controlled so that the solution is operated in the undersaturated condition. This condition is enabling the grown crystal particles to dissolve back into solution. Thus reducing the amount of fine crystals in the overall CSD. Therefore the objective of this study is to develop and evaluate controlled cooling for batch seeded crystallization of potassium nitrate incorporating dissolution phenomena. The mathematical model for potassium nitrate crystallization is developed and simulated in MATLAB software where it is validated against experimental data. The optimization algorithm is then developed in order to determine the set-point trajectory for closed­ loop control. Based on this optimal trajectory a closed-loop control is proposed to maintain the crystallization operation at its set-point using two types of controller which consists of Proportional (P) and Proportional-Integral (PI) controllers. Two important criteria are measured in the closed-loop simulation which are the performance of PI controller to follow the given set-point trajectory and the achievement of target CSD. Based on the closed-loop control it is shown that the PI control is more superior than P control by maintaining the operation at its set-point and successfully achieved the desired CSD. In addition the production of fines particle is greatly reduced indicating this new optimal trajectory is capable of producing the target CSD and minimizes the effects of nucleation.
format Conference or Workshop Item
author Siti Zubaidah, Adnan
Suriyati, Saleh
Noor Asma Fazli, Abdul Samad
author_facet Siti Zubaidah, Adnan
Suriyati, Saleh
Noor Asma Fazli, Abdul Samad
author_sort Siti Zubaidah, Adnan
title Evaluation of controlled cooling for seeded batch crystallization incorporating dissolution
title_short Evaluation of controlled cooling for seeded batch crystallization incorporating dissolution
title_full Evaluation of controlled cooling for seeded batch crystallization incorporating dissolution
title_fullStr Evaluation of controlled cooling for seeded batch crystallization incorporating dissolution
title_full_unstemmed Evaluation of controlled cooling for seeded batch crystallization incorporating dissolution
title_sort evaluation of controlled cooling for seeded batch crystallization incorporating dissolution
publisher AIP Publishing LLC.
publishDate 2019
url http://umpir.ump.edu.my/id/eprint/25821/2/Evaluation%20of%20controlled%20cooling%20for%20seeded%20batch%20crystallization%20incorporating%20dissolution.pdf
http://umpir.ump.edu.my/id/eprint/25821/
https://doi.org/10.1063/1.5117102
https://doi.org/10.1063/1.5117102
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score 13.211869