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
Subjects:	TP Chemical technology
Online Access:	http://umpir.ump.edu.my/id/eprint/25821/ http://umpir.ump.edu.my/id/eprint/25821/ http://umpir.ump.edu.my/id/eprint/25821/ http://umpir.ump.edu.my/id/eprint/25821/2/Evaluation%20of%20controlled%20cooling%20for%20seeded%20batch%20crystallization%20incorporating%20dissolution.pdf

id	ump-25821
recordtype	eprints
spelling	ump-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
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
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/ http://umpir.ump.edu.my/id/eprint/25821/ http://umpir.ump.edu.my/id/eprint/25821/ http://umpir.ump.edu.my/id/eprint/25821/2/Evaluation%20of%20controlled%20cooling%20for%20seeded%20batch%20crystallization%20incorporating%20dissolution.pdf
first_indexed	2023-09-18T22:39:52Z
last_indexed	2023-09-18T22:39:52Z
_version_	1777416842737876992

Evaluation of controlled cooling for seeded batch crystallization incorporating dissolution

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