It is a chemical way to extract oil.
This kind of extraction uses chemical solvent to dissolve oil content contained in cake or oil seeds.
Oil is collected by vaporizing solvent out which is later recycled.
about 2% oil in the final cake (meal).
This method results in higher capacity; Lower power consumption, lower wear & tear / maintenance and high extract efficiency.
Thus it could be used as complement equipment to extract the oil remained in cake, which gives extra profit to entrepreneurs.
Or the solvent extraction could be configured to process raw soybean and some other seeds directly.