Fractionation of Rapeseed from Oil Extraction to Minor Products
Steffen Hruschka, GEA Westfalia Separator Group GmbH 
Oelde, Germany
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Starting with the composition of the seed, the presentation illustrates the breakdown of the seeds, mainly by mechanical processes. 
The main product is still the oil. But since different factors have a negative impact on the oil price, oil refining costs are more and more in focus and other by-products and new processes are becoming more interesting for oil producers .  
Different steps will be illustrated: 1) Seed and pre-treatment, 2) De-oiling, 3) Oil and derivate processing, 4) Cake and flakes processing and finally there are some reflections on the 5) By-products from both sides: those from the oil fraction and those from the cake or expeller side.
The oil and the protein content, the hull thickness and therefore the fibre content, the sinapin and phytic acid content, the glycosinolate content etc. are not only given and fixed in the incoming raw material. This can be influenced already with the first step: the pre-treatment and the kind of process used for the oil extraction.
Consequently, the oil refining starts between 10 ppm phosphorous or < 1000 ppm phosphorus in the oil depending on the extraction technique, but what is not in the extracted oil remains in the cake or expeller, meaning phosphorus, too. That influences the percentage of the substances in each fraction and ultimately the processes itself. 
Sometimes the focus of the process is in the reduction of hulls and fibre in the cake used for feed without any reduction of the nativity of the proteins. Other research teams are looking for purified protein isolates with a high potential to adsorb water and/or oil or to be a good emulsifier. Research projects like SynRG (financed by FNR/BMELV) are supported in order to isolate minor components like polyphenols and to implement these in polymerization of dicarbonic acids made out of plant seed oils.