LAPSE:2020.0157
Published Article
LAPSE:2020.0157
A Hybrid Framework for Simultaneous Process and Solvent Optimization of Continuous Anti-Solvent Crystallization with Distillation for Solvent Recycling
Jiayuan Wang, Lingyu Zhu, Richard Lakerveld
February 3, 2020
Anti-solvent crystallization is frequently applied in pharmaceutical processes for the separation and purification of intermediate compounds and active ingredients. The selection of optimal solvent types is important to improve the economic performance and sustainability of the process, but is challenged by the discrete nature and large number of possible solvent combinations and the inherent relations between solvent selection and optimal process design. A computational framework is presented for the simultaneous solvent selection and optimization for a continuous process involving crystallization and distillation for recycling of the anti-solvent. The method is based on the perturbed-chain statistical associated fluid theory (PC-SAFT) equation of state to predict relevant thermodynamic properties of mixtures within the process. Alternative process configurations were represented by a superstructure. Due to the high nonlinearity of the thermodynamic models and rigorous models for distillation, the resulting mixed-integer nonlinear programming (MINLP) problem is difficult to solve by state-of-the-art solvers. Therefore, a continuous mapping method was adopted to relax the integer variables related to solvent selection, which makes the scale of the problem formulation independent of the number of solvents under consideration. Furthermore, a genetic algorithm was used to optimize the integer variables related to the superstructure. The hybrid stochastic and deterministic optimization framework converts the original MINLP problem into a nonlinear programming (NLP) problem, which is computationally more tractable. The successful application of the proposed method was demonstrated by a case study on the continuous anti-solvent crystallization of paracetamol.
Keywords
crystallization, Distillation, PC-SAFT, process design, solvent design
Suggested Citation
Wang J, Zhu L, Lakerveld R. A Hybrid Framework for Simultaneous Process and Solvent Optimization of Continuous Anti-Solvent Crystallization with Distillation for Solvent Recycling. (2020). LAPSE:2020.0157
Author Affiliations
Wang J: School of Chemical Engineering, Zhejiang University of Technology, Hang Zhou 310014, China; Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Hong Kong 999077, China
Zhu L: School of Chemical Engineering, Zhejiang University of Technology, Hang Zhou 310014, China
Lakerveld R: Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Hong Kong 999077, China
Journal Name
Processes
Volume
8
Issue
1
Article Number
E63
Year
2020
Publication Date
2020-01-02
Published Version
ISSN
2227-9717
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PII: pr8010063, Publication Type: Journal Article
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LAPSE:2020.0157
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doi:10.3390/pr8010063
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Feb 3, 2020
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Calvin Tsay
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