Journal of Siberian Federal University. Biology: Scale-Up of the Downstream Process for Polyhydroxyalkanoate Copolymer P(HB‑co-HHx) Extraction with Nonhalogenated Solvents

Journal of Siberian Federal University. Biology / Scale-Up of the Downstream Process for Polyhydroxyalkanoate Copolymer P(HB‑co-HHx) Extraction with Nonhalogenated Solvents

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Issue: Journal of Siberian Federal University. Biology. 2021 14 (4)
Authors: Thiele, Isabel; Jan Hendrik Rose; Gutschmann, Björn; Tofaily, Samantha; Schöttel, Julie; Widmer, Torsten; Neubauer, Peter; Grimm, Thomas; Riedel, Sebastian L.
Contact information: Thiele, Isabel: Technische Universität Berlin Berlin, Germany; ORCID: 0000-0003-2871-7399; Jan Hendrik Rose: ANiMOX GmbH Berlin, Germany; Gutschmann, Björn: Technische Universität Berlin Berlin, Germany; ORCID: 0000-0003-0166-8734; Tofaily, Samantha: ANiMOX GmbH Berlin, Germany; Schöttel, Julie: ANiMOX GmbH Berlin, Germany; Widmer, Torsten: ANiMOX GmbH Berlin, Germany; Neubauer, Peter: Technische Universität Berlin Berlin, Germany; ORCID: 0000-0002-1214-9713; Grimm, Thomas: ANiMOX GmbH Berlin, Germany; Riedel, Sebastian L.: Technische Universität Berlin Berlin, Germany; ; ORCID: 0000-0003-1373-417X
Keywords: P(HB‑co-HHx); mcl-PHA; nonhalogenated solvents; PHA recovery
Abstract: Biobased and biodegradable polyhydroxyalkanoates (PHAs) are promising alternatives to common plastics. Due to their high production costs, only a minimal share of global plastic production is composed of PHA. A major contributor to the high costs minimizing the potential to occupy a larger market share is the downstream process. To obtain high recovery yields and pure products, most approaches rely on large amounts of solvents. While short-chain-length PHA (scl-PHA) is poorly soluble in nonhalogenated solvents, medium-chain-length PHA (mcl-PHA) was shown to be soluble in nonhalogenated solvents. In this study, an approach to recover poly(hydroxybutyrate-co-hydroxyhexanoate) with acetone and 2-propanol was scaled up 30-fold to 300 g of lyophilized cells per recovery cycle. High PHA purities of 90–100 % were reached from extractions at moderate temperatures from 30–58 °C. In two-stage extractions, up to 100 % PHA was recovered, while the molecular weight was not reduced. Solvents were recovered by distillation in a concentration step and after precipitation. Furthermore, the material properties were analyzed. PHA recovered from the distillation bottom had an increased HHx content compared to the first and second extractions using recovered solvents and was of low purity, indicating efficient and pure precipitation of the recovered PHA during the 2-stage extractions
Pages: 454–464
DOI: 10.17516/1997-1389-0364
Paper at repository of SibFU: https://elib.sfu-kras.ru/handle/2311/145134

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