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US 4,127,944 AGranted
Method for drying water-absorbent compositions
AssigneeNational Starch and Chemical Corporation
InventorBartolo J. Giacobello
Life of this patent
Estimating the term…
Abstract
Improved particle agglomeration of water-absorbent compositions of matter together with improved "wet-out" and consequent absorbent properties are provided by a method for drum drying said compositions under controlled conditions.
Claims9
A method for drying a water-absorbent composition comprising the steps of:
- (a) forming a slurry or wet cake of said composition with water and a water-miscible alcohol such that the slurry contains from 20 to 35% solids, by weight, and from 15 to 85% water on solids, by weight, and the wet cake contains 36 to 55% solids, by weight, and from 15 to 50% water on solids, by weight;
- (b) feeding the slurry or wet cake onto a heated drum dryer having a surface temperature of 250.degree. to 380.degree. F. at a rate to produce a film of from 10 to 100 mils in thickness;
- (c) recovering the dried product in flake form from the drum surface, whereby the dried product is obtained in granular, agglomerated form and has improved water dispersibility and absorbent properties.
Dependencies are inferred from the claim text.