Impact of texturing/cooling by Instant controlled pressure drop DIC on pressing and/or solvent extraction of vegetal oil


Abstract Instant controlled pressure drop process (DIC) was used as a texturing pretreatment in order to recover the highest part of oil content of various oleaginous materials such as jatrophacurcas, rapeseeds, camelina seeds and date seeds at 5% to 6% (dry basis) water content. Pressing and n-hexane 95% solvent extraction of oil from both DIC-textured and non-treated raw material RM seeds was achieved using separately ASE (Accelerated Solvent Extraction at high pressure and temperature,and short time) for quantifying the oil content, and conventional industrial solvent extraction of 2-hour Dynamic Maceration (DM) extraction at 68 oCto establish extraction kinetics and practical yields. Whatever the extraction process and the oilseed species were, optimized DIC treatment allowed increasing oil yields and extraction kinetics whilst perfectly preserving oil quality. It was possible to perform comparative studies and to optimize DIC treatment based on oil extraction yields. DIC treatment performed at 0.63 MPa between 45 and 105 s depending on oleaginous varieties allowed getting much higher oil yields: 96.4% instead of 81%, 92.6% instead of 76%, 93.4%, instead of 86.3%, and 79% instead of 63% of oil contents from rapeseeds, camelina seeds, Jatropha and date seeds, respectively. Besides, in terms of fatty acid composition, instant cooling via DICenabled the preservation of the oil lipid profile.

Keywords Instant controlled pressures drop (DIC), Solvent extraction, Oil pressing, oil seeds, solvent extraction, Fatty acids.

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