	US 7,562,419 B2
	Process for purification of cotton linters
Paul C. Gillette, Newark, Del. (US); and Charles Ernest Hall, Wilmington, Del. (US)
Assigned to Hercules Incorporated, Wilmington, Del. (US)
Filed on Jul. 13, 2005, as Appl. No. 11/179,301.
Prior Publication US 2006/0010669 A1, Jan. 19, 2006
Int. Cl. D01B 1/04 (2006.01)

U.S. Cl. 19—41

11 Claims

1. A process for purifying raw cotton linters comprising

a) cutting a first, second, third, or mill run cut raw cotton linters torn particle size that passes through a 2,500 micrometer screen, and

b) mechanically separating the cut raw cotton linters into clean and unclean fractions,

whereby the clean fraction contains purified cut raw linters and the unclean fraction contains the impurities, wherein the mechanically separating step (b) is performed by either one or more progressively finer sieves, or an air classifier.