Apparatus for producing sodium perborate monohydrate and product

Details Apparatus for producing sodium perborate monohydrate and product Apparatus for producing sodium perborate monohydrate and product

1995-05-25

1997-01-21

Bennett, Henry A.

Drying and gas or vapor contact with solids

Apparatus

With fluid current conveying of treated material

34582, 34586, 34588, 34 68, 34210, 34218, 422142, 422146, F26B 1700

Patent

active

055950019

ABSTRACT:
Method and apparatus for producing sodium perborate monohydrate by dehydrating sodium perborate tetrahydrate in a fluid bed with heated air. Contact surfaces are arranged inside the fluid bed whose total area is the same as up to 500 times the area of the approach-flow bottom of the fluid bed. The contact surfaces are advantageously designed as heat exchangers whose surface temperature is adjusted to maintain 90.degree. to 110.degree. C. at the contact surfaces. The method results in a sodium perborate monohydrate with especially high abrasion resistance. In addition, the energy requirement is lower than that provided in the previously known method commonly used in the industry.

REFERENCES:
patent: 3914380 (1975-10-01), Dillenburg et al.
patent: 4704804 (1987-11-01), Wyatt et al.
patent: 4942025 (1990-07-01), Condo et al.
patent: 5104631 (1992-04-01), Reginato
patent: 5133137 (1992-07-01), Petersen
patent: 5229092 (1993-07-01), Dugua
Brochure of Sulzer Escher Wyss "Fliessbett-Technik" p. 10.
DIN ISO 3310 concerning seiving specimens subsequent to ball milling on cover of ISO 3310 and discused on p. 15 of the application.
"Sodium perborates for industrial use--Determination of degree of attrition", International Standard ISO 5937, International Organization for Standardization, Nov. 1, 1980.
John H. Perry, Chemical Engineers' Handbook, 4th ed., McGraw-Hill Book Co. (1963), pp. 20-50 to 20-53.

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