After centrifugal extraction of the digested mash, the fibre contains 13% to 25% oil on dry matter and 45% to 55% of moisture. The percentage of residual oil in fibre is still too high amounting to 8% to 18% of the total oil. If the fibre is subjected to a pressure of 50 bar the residual oil can be further brought down to 8% – 9%. The extracted crude oil is very thick laden with solids. It contains approximately 20% oil. With centrifugal separation, only 80% to 85% of the oil can be separated due to the high solid content. The residual oil remained attached to cellular debris.