Optimal design of continuous crystallizers

Citation for published version (APA):Porru, M., Ozkan, L., & Kalbasenka, A. (2016). Optimal design of continuous crystallizers. Poster sessionpresented at Advanced Process Modelling Forum (APMF 2016), April 20-21, 2016, London, UK, London, UnitedKingdom.

Document status and date:Published: 01/04/2016

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Download date: 01. May. 2020

www.ispt.euInstitute for Sustainable Process Technology

Analysis of C1 through simulations

Optimal design of continuous crystallizersMarcella Porru*, Leyla Özkan*, Alex Kalbasenka+.

*Eindhoven University of Technology, Control Systems Group+Corbion, Gorinchem, Netherlands

Scope of the project IMPROVISEClosing the gap between offline and online use of rigorous

process models in daily operation of chemical plants.

www.ISPT.eu/media/PSE-20-01-IMPROVISE.pdf

Project goals with respect to crystallization

• Batch crystallization operation and modelling studies.

• Online model-based monitoring and control.

•Optimal design of continuous crystallizers.

Motivation

Overcome typical drawbacks of the (semi) batch operation

(low batch to batch reproducibility, controllability,

observability, and scale up problems).

C1: Single MSMPR C2: Single MSMPR with recycle

C3: Series of two crystallizers

Analysis of C2 through simulations

The recycle ratio does not have influence on yield and PSD.

Analysis of C3 through simulations

Optimization problem

C1

C2

C3

maximize𝑌𝑌𝑌𝑌𝑌𝑌𝑌𝑌𝑌𝑌Pressure

subject to: 𝐷𝐷𝐷𝐷 > 𝜀𝜀𝐷𝐷𝐷𝐷model

maximize𝑌𝑌𝑌𝑌𝑌𝑌𝑌𝑌𝑌𝑌Pressure, Recycle

subject to: 𝐷𝐷𝐷𝐷 > 𝜀𝜀𝐷𝐷𝐷𝐷model

Yield penalized if large crystals are

desired

No solution

maximize𝐷𝐷𝐷𝐷Pressure P1

subject to: max𝑃𝑃2

𝑌𝑌𝑌𝑌𝑌𝑌𝑌𝑌𝑌𝑌

model

At high yields there is margin to improve the dimension of the

crystals

Conclusion and future work

• C1: The optimal pressure for the single MSMPR is the result

of a compromise between high yield and large D50.

• C2: The addition of a recycle stream does not improve the

crystallization performance.

• C3: Optimal setting of pressures of the first and second

crystallizer allows to operate at the maximum yield and obtain

larger crystals compared with the use of a single unit.

• Cost estimation under study to evaluate the costs/profits

associated with the addition of a second crystallizer.

C3: Optimization of P1 and P2 through gCRYSTAL

Process configurations under study