NOVELTY - Multi-stage substantially continuous process for separating a source stream having a pH of above 5, comprises providing a first stream comprising dried distiller grains with solubles, separating, from the source stream, a stream comprising predominantly proteins and oil in a water mixture form and a stream comprising predominantly fiber materials, separating a stream containing predominantly oil and a stream containing predominantly proteins from the water mixture, and progressively concentrating the stream containing predominantly proteins in at least one additional step.    USE - The multi-stage substantially continuous process is useful for separating a source stream including fibers, proteins and oil, having a pH of above 5 into three streams each containing predominantly one component (claimed). The oil is useful as cooking oil and biofuel. The protein is useful in the manufacture of commercial products including coatings for paper cups and candy, nuts, fruit, pills, and other encapsulated foods and drugs, soda bottle cap linings, clothing fabric, buttons, adhesives and binders. The fiber is useful in the production of lignocellulosic ethanol.    DETAILED DESCRIPTION - Multi-stage substantially continuous process for separating a source stream having a pH of above 5, comprises providing a first stream comprising dried distiller grains with solubles, where the dried distiller grain stream contains water, oil, protein and fibers, which contain hemicellulose and cellulose components, separating, from the source stream, a stream comprising predominantly proteins and oil in a water mixture form and a stream comprising predominantly fiber materials, separating a stream containing predominantly oil and a stream containing predominantly proteins from the water mixture, and progressively concentrating the stream containing predominantly proteins in at least one additional step, where the source stream intermixedly contains fibers, proteins and oil, and the source stream contains dried distiller grains with solubles.