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Gas assisted oilseed pressing

机译：气辅油压

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摘要

Recently oils from rapeseed and soybeans have gained increased importance in the alimentary sector and as regenerative energy source. Therefore, new technologies for enhanced oilseed expression are becoming increasingly interesting. In conventional seed oil production oil is recovered by mechanical solid-fluid separation using a screw press and/or by continuous solvent extraction with hexane (M. Bockisch, Handbuch der Lebensmitteltechnologie: Nahrungsfette und -Ole, Verlag Eugen Ulmer, Stuttgart, 1993, M. Bockisch, Fats and Oils Handbook, AOCS Press, Illinois, 1998). The new process of gas assisted oilseed pressing is a mechanical solid-fluid separation aided by the application of a dense gas. The gas is contacted with the oilseed before or during pressing in order to achieve lower residual oil contents. Different experimental studies could demonstrate the effectiveness of gas assisted oil pressing, especially using carbon dioxide. In uniaxial pressing experiments oil yield could be increased from 27% to as much as 71%. Against this background the omission of the solvent extraction step becomes a worthwhile option. It has been attempted to prove theoretically and experimentally the predominant effects, which can be divided into dissolution related and gas flow related effects. It became clear that the dominance of one mechanism or another depends on processing conditions, particularly residence time and dimension of the press cake.
机译：最近，来自菜籽油和大豆的油在食品领域和作为再生能源越来越重要。因此，用于增强油料种子表达的新技术变得越来越有趣。在常规的种子油生产中，通过使用螺旋压榨机进行机械固液分离和/或通过使用己烷进行连续溶剂萃取来回收油（M. Bockisch，Handbuch der Lebensmitteltechnologie：Nahrungsfette und -Ole，Verlag Eugen Ulmer，斯图加特，1993，M （Bockisch，《油脂手册》，AOCS出版社，伊利诺伊州，1998年）。气体辅助油料压制的新方法是通过施加浓密气体辅助的机械固液分离。在压榨之前或期间，气体与油料接触，以实现较低的残留油含量。不同的实验研究可以证明气辅油压制的有效性，尤其是使用二氧化碳时。在单轴压制实验中，油的产率可以从27％提高到71％。在这种背景下，省略溶剂萃取步骤成为值得的选择。已经尝试在理论上和实验上证明主要作用，该作用可分为溶解相关作用和气流相关作用。很明显，一种机理或另一种机理的优势取决于加工条件，特别是停留时间和压饼的尺寸。

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