Process for spray drying sodium dichloroisocyanurate
AssigneeNiro Atomizer A/S
InventorJens C. T. Moller
Life of this patent
Estimating the term…
Abstract
A stable, free-flowing sodium dichloroisocyanurate dihydrate powder is prepared by spray drying an aqueous solution or slurry of sodium dichloroisocyanurate to form a particulate product having a moisture content from about 12.0 to about 20.0% by weight and subjecting this product to specific stabilizing and cooling after-treatment steps in a plurality of fluidized and/or vibrating beds. During the stabilizing step the product is dried to the final moisture level, if necessary, and the water of hydration is uniformly distributed and firmly bound to the particulate product.
Claims19
A process for the production of a stable, free-flowing particulate sodium dichloroisocyanurate dihydrate product comprising the steps of:
- (a) forming a particulate sodium dichloroisocyanurate product having a moisture content in the range of about 12.0 to about 13.5% by weight and a temperature of about 60.degree. C. to about 80.degree. C. by spraying an aqueous solution or slurry of sodium dichloroisocyanurate spray with a heated drying gas flowing through said chamber;
- (b) stabilizing said particulate product by agitating said product in a confined treating zone for a period of from about 1 to about 30 minutes, and at a temperature below which further reduction of the moisture content of said product will occur, whereby the water of hydration contained in said sodium dichloroisocyanurate product becomes uniformly distributed and firmly bound to said product;
- (c) cooling the stabilized particulate product to a temperature below 40.degree. C. in at least one fluidized or vibrating-fluidized bed;
- and
- (d) recovering a dry, stable, free-flowing particulate sodium dichloroisocyanurate dihydrate product from said cooling step.
A process for the production of a stable, free-flowing particulate sodium dichloroisocyanurate dihydrate product comprising the steps of:
- (a) forming a particulate sodium dichloroisocyanurate product having a moisture content in the range of about 13.5 to about 20.0% by weight and a temperature of about 60.degree. C. to about 80.degree. C. by spraying an aqueous solution or slurry of sodium dichloroisocyanurate into a drying chamber and contacting the sodium dichloroisocyanurate spray with a heated drying gas flowing through said chamber;
- (b) stabilizing said particulate product by agitating said product in a confined treating zone for a period of from about 1 to 30 minutes, and at a temperature sufficient to reduce the moisture content of said product to a value in the range of about 12.0% to about 13.5% by weight whereby the water of hydration contained in said sodium dichloroisocyanurate product becomes uniformly distributed and firmly bound to said product;
- (c) cooling the stabilized particulate product to a temperature below 40.degree. C. in at least one fluidized or vibrating-fluidized bed;
- and
- (d) recovering a dry, stable, free-flowing particulate sodium dichloroisocyanurate dihydrate product from said cooling step.
Dependencies are inferred from the claim text.