C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
209/85, 260/221.
C08L 3/00 (2006.01) B41M 5/124 (2006.01) C08B 30/04 (2006.01)
Patent
CA 1129816
Large Granule Starch Recovery System Using 3 Hydrocyclones ABSTRACT A large granule starch protective material for pressure sensitive microencapsulated coatings, particularly carbonless copy duplicating paper. A previously dried cereal starch selected from, the group consisting of wheat, barley and rye is subjected to wet process separation to obtain a large granule starch from the starting starch, which has a characteristic particle size distribution including smaller granules ranging in size from 2 microns to about 16 microns, and a second group of larger granules, mostly ranging in size from 16 microns to about 35 microns. An improved yield of large granule starch is made possible by the method of the invention which includes partially separating the large granule portion of a wheat starch using a primary hydrocyclone, and second and third hydrocyclones which supply recirculation streams to the feed stream to the first hydrocyclone. The underflow from the second hydrocyclone is a high yield, large granule starch product stream, and the overflow is a re- circulation stream which is fed back to the primary hydrocyclone feed stream. The overflow from the primary hydrocyclone is directed into a third hydro- cyclone. The underflow from the third hydrocyclone is also fed back as a recirculation stream to the primary hydrocyclone feed stream, and the over- flow from the third hydrocyclone is led away as a small granule by product, which may be subjected to further processing, or may be dried and sold as a small granule product. It has been found that the best balance of the system, and the highest yield of large granule product is obtained when the particle size distribution of the recirculation feed streams matches, or nearly matches, the particle size distribution of the feed stream. The large granule cereal starch product collected from the under- flow of the second hydrocyclone may be further upgraded in average particle size by blending a minor amount of a large granule starch therewith. Refined pea starch, sago starch, arrowroot starch, horse bean starch, or other starch having an average particle size in the range of 20-40 microns, preferably 20-35 microns, may be blended with large granule cereal starch product for this purpose. The above recirculation system improves the percentage yield of useful protective starch material derived from prime grade, wheat, barley or rye starch by as much as 15-25%.
306836
Fetherstonhaugh & Co.
Henkel Corporation
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