Abstract: A process for producing bio-diesel is described in which a consolidator in the form of a hydrocyclone is located between the processor or reactor and a separator to improve the efficiency of the overall formation of bio-diesel. The present of the consolidator in which the major constituents of the bio-diesel is in one part or in one flow both within the consolidator and the by-products are in another part of flowpath within the consolidator acts to condition the mixture from the processor so that more efficient separation can take place in the separator thereby reducing the time taken to achieve separation of the bio-diesel component from the by-product.