NIPL refinery plants are specifically designed to give the maximum output results with minimum operational cost. OIL Refining Plant Batch Refining / Continuous Refining. Refining of COTTON SEED oil is essential to ensure removal of gums, waxes, and free fatty acid (F. F.A.) from the oil, to impart uniform colour by removal of colouring pigments and to get rid of unpleasant smell from the oil. Equipments involves:-  Neutralizer Bleacher Deodorizer Heat Exchanger Vacuum