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Evaluation and modelling of continuous flow sub-critical water hydrolysis of biomass derived components; lipids and carbohydrates

Baig M.N., Santos R.C.D., King J., Pioch D., Bowra S.. 2013. Chemical Engineering Research and Design, 91 (12) : p. 2663-2670.

DOI: 10.1016/j.cherd.2013.05.029

Sub-critical water is widely accepted as an environmentally benign solvent, for extraction but also as a catalytic medium therefore has the potential to support processing of multiple components found in biomass. The manuscript demonstrates the versatility of sub-critical water as a generic medium to support hydrolysis of rice bran (carbohydrates) and sunflower oil (lipid substrates), substrates that possess very different physio-chemically properties within a continuous flow process configuration. Response surface methodologies (RSM) were used to assist modelling the multiple process parameters that impact sub-critical water mediate hydrolysis of sunflower oil. Successful validation, of the models illustrate that 100% FFA yield would be achieved at temperature 385 °C; pressure 20 MPa; residence time of 35 min; oil to water ratio 1:1.8 (v/v) represents 65% water. Experiments conducted under these conditions yielded 93.5%, thereby confirming the utility of the RSM as a tool to assist in process development.

Mots-clés : biomasse; technique analytique; extraction au fluide supercritique; eau; extraction par solvant; glucide; lipide; modèle; hydrolyse; huile de tournesol; son; riz; son de riz

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