Patent GB-671935-A (GB)
Title: A method of recovering protein from protein-containing material
IPC: A23J1/14
Filed: 1949-02-17
Abstract: In recovering protein from a protein-containing material, e.g peanuts or soya beans, ground after removal of oil, the material is suspended in a liquid with a pH value at which the proteins are dissolved, and the suspension, after coarse straining, is subjected to a first centrifugal separation at which the main part of the suspended impurities is removed as a concentrate in a centrifugal separator constructed for continuous discharge of the concentrate, e.g. a nozzle type separator, the separated liquid component is then subjected to a second separation in centrifugal separators, preferably of the yeast separator type, from which is discharged a purified, protein-containing liquid and a concentrate of finer impurities, the concentrates from the first and second centrifugal separations are mixed and subjected to a third separation in a centrifugal separator with continuous discharge of the solid substances through openings or nozzles in the wall of the separator bowl, the throughput and separating ability of this separator being such that the discharged liquid component is sufficiently pure that it can be returned into the process without causing, in continuous operation, any increase of the amount of finer impurities in the system or in the purified liquid discharged from the second separation centrifuges.  The concentrates from the first and second separations may be mixed with water or other liquid adjusted to a pH value at which the proteins are dissolved.  The liquid component from the third separation may be brought together with the liquid component from the second separation, may be conducted to the inlet of the separator of the second separation, or may be employed for dissolving protein in the initial material.ALSO:In recovering protein from a protein-containing material, the material is suspended in a liquid with a pH value at which the proteins are dissolved, and the suspension, after coarse straining, is subjected to a first centrifugal separation at which the main part of the suspended impurities is removed as a concentrate in a centrifugal separator constructed for continuous discharge of the concentrate, e.g. a nozzle type separator, the separated liquid component is then subjected to a second separation in centrifugal separators, preferably of the yeast separator type, from which is discharged a purified, protein-containing liquid and a concentrate of finer impurities, the concentrates from the first and second centrifugal separations are mixed and subjected to a third separation in a centrifugal separator with continuous discharge of the solid substances through openings or nozzles in the wall of the separator bowl, the throughput and separating ability of this separator being such that the discharged liquid component is sufficiently pure that it can be returned into the process without causing, in continous operation, any increase of the amount of finer impurities in the system or in the purified liquid discharged from the second separation centrifuges.  The concentrates from the first and second separations may be mixed with water or other liquid adjusted to a pH value at which the proteins are dissolved.  The liquid component from the third separation may be brought together with the liquid component from the second separation, may be conducted to the inlet of the separator of the second separation, or may be employed for dissolving protein in the initial material.