Feedback control of a ternary solvent system with increased productivity

Iben Østergaard*, Botond Szilagyi, Zoltan K. Nagy, Heidi Lopez de Diego, Haiyan Qu

*Kontaktforfatter for dette arbejde

Publikation: Konferencebidrag uden forlag/tidsskriftPaperForskning


In this work, increased productivity of the model compound indomethacin (IMC) was obtained using the ternary solvent mixture of acetone-methanol-water system compared to the pure sol-vents. IMC is a nonsteroidal anti-inflammatory drug and it has been reported to form five polymorphs and several solvates, which lead to significant challenges in the crystallization process as the product has to be crystallized with the desired solid form and the preferred parti-cle size and shape. However, the metastable α-IMC having needle-like crystal shape and the thermodynamically most stable γ-IMC having plate-like crystal shape are most commonly ob-served.
The crystallization behaviour of IMC is studied by antisolvent crystallization and was carried out with acetone-methanol (66.5-33.5 wt%) as solvent and water as an antisolvent. The benefits of using different feedback strategies with various process analytical technologies (PATs) were investigated to control the crystal size distribution (CSD) and simultaneously obtaining the de-sired polymorph.
The obtained results show how feedback control of a ternary solvent mixture increases produc-tivity and simultaneously ensures a unimodal CSD and desired polymorphism.
Publikationsdatosep. 2019
StatusUdgivet - sep. 2019
BegivenhedThe International Workshop on Industrial Crystallization - Vistec, Rayong, Thailand
Varighed: 25. aug. 201927. nov. 2019
Konferencens nummer: 26


KonferenceThe International Workshop on Industrial Crystallization

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