Patent GB-425936-A (GB)
Title: Improvement in starch making system
IPC: C08B30/04
Filed: 1934-04-04
Abstract: 425,936. Making starch. INTERNATIONAL PATENTS DEVELOPMENT CO., 17, Battery Place, New York, U.S.A. April 4, 1934, No. 10174. Convention date, April 26, 1933. [Class 121] In a wet process of obtaining starch from corn by steeping and comminuting the corn and separating from the germ and slop a mixture of starch and gluten in water, some of the starch, substantially free from gluten is separated from the starch and gluten mixture, e.g. in a settling vessel, and the residue of the mixture is then treated, e.g. on starch tables, to separate the remainder of the starch. According to the arrangement shown, the corn is steeped in water containing sulphur dioxide in tank A, the steep water being discharged to evaporators by pipe 11. The steeped corn is ground in mill B and passed to a separator C. The germs floated in the separator pass to the germ wash D, the liquid from which is passed back to the separator through pipe 15. The germs, containing a small amount of water, are discharged through pipe 16. The degerminated corn passes to reel E and the slop from this reel passes via pipe 18 to the mill G The liquid from the reel passes to a shaker F, the grits from which also pass to the mill G. The slop and grits ground in mill G pass to the coarse slop wash H, the coarse slop containing a small amount of water being discharged from the system by pipe 22. The liquid from slop wash H passes to a shaker I, from which the fine slop passes through pipe 24 to the fine slop wash J, from which the fine slop is discharged. The mill starch from the slop wash J passes to the separator-concentrator N, which classifies the material into preferably three strata : in the lower part, starch, substantially free from gluten, which passes through pipe 26 to the filter S ; water in the upper part of the apparatus which passes via pipes 27 and 28 partly to the germ wash D and partly to the coarse slop wash H; and a middle stratum of starch and gluten which is drawn off into the mixing vessel U into which is also discharged mill starch from the shakers F and I. This mixture is passed over the starch tables O, the water and gluten passing to the gluten settlers P, from which the gluten water is returned to the steep tank A by the pipes 31. The settled gluten passes to press Q, the water from which is passed back to the settler via pipe 33, the gluten being discharged by pipe 34. The starch flushed from the tables by water from pipe 35 passes to the first filter R, where it is de-watered and washed with fresh water from pipe 37, the filtrate being delivered via pipes 38 and 39 to the coarse slop wash H and the fine slop wash J. The starch is passed to a dilution tank T where fresh water is added, and then to the second filter S where it is de-watered and washed with fresh water together with the starch from the separator-concentrator N. The filtrate passes partly to the fine slop wash J and partly into the flushing water pipe 35 for the starch tables O. The starch is discharged via pipe 46. In an alternative arrangement, the water stratum from the concentrator N, instead of being returned to the germ wash D and coarse slop wash H, is sent to a separate set of starch tables, the separated starch being returned to the concentrator N, or possibly discharged from the system if the gluten content is sufficiently low. The gluten and water from these tables pass into a settler, the water separated being returned to the germ wash D and coarse slop wash H. Specifications 277,572, [Class 121], and 419,286 are referred to.