Chemistry of inorganic compounds – Carbon or compound thereof – Oxygen containing
Reexamination Certificate
2007-07-10
2007-07-10
Anthony, Joseph D. (Department: 1714)
Chemistry of inorganic compounds
Carbon or compound thereof
Oxygen containing
C423S415100, C423S421000, C423S275000, C252S186270, C252S186320, C510S444000, C510S446000, C510S456000, C427S213000, C427S215000, C427S314000
Reexamination Certificate
active
10223351
ABSTRACT:
The invention relates to a process for the preparation of coated granular sodium percarbonate having a low TAM value. The preparation is carried out by fluidized-bed spray granulation at a temperature TGin the range from 45 to 75° C., and the coating is effected by the spray application of an aqueous solution containing at least one coating component in a fluidized bed at a temperature TUin the range from 35 to 100° C. According to the invention, a) after the fluidized-bed spray granulation but before the coating, drying is carried out at TNTof greater than TG, or b) the fluidized-bed granulation is carried out in at least two steps at TG1, TG2. . . TGn, TG2or TGnbeing higher than TG1, and drying being unnecessary if ⅔ of the granulate have been formed at TG1, or c) drying takes place not after the granulation but after the coating, at TUNT, TUNTbeing at least 20° C. higher than TG.
REFERENCES:
patent: 3917663 (1975-11-01), Kegelart et al.
patent: 4428914 (1984-01-01), Brichard et al.
patent: 5294427 (1994-03-01), Sasaki et al.
patent: 5560896 (1996-10-01), Bewersdorf et al.
patent: 5714201 (1998-02-01), Bewersdorf et al.
patent: 5851420 (1998-12-01), Kim et al.
patent: 5935708 (1999-08-01), Schuette et al.
patent: 6113805 (2000-09-01), Schutte et al.
patent: 6231828 (2001-05-01), James et al.
patent: 6482385 (2002-11-01), James et al.
patent: 2002/0041843 (2002-04-01), Jakob et al.
patent: 2002/0086807 (2002-07-01), Lee et al.
patent: 2002/0127168 (2002-09-01), Jakob et al.
patent: 2003/0104967 (2003-06-01), Jakob et al.
patent: 27 33 935 (1978-02-01), None
patent: 100 48 514 (2002-04-01), None
patent: 0 962 424 (1999-12-01), None
patent: 0 970 917 (2000-01-01), None
patent: WO 95/06615 (1995-05-01), None
patent: WO 97/19890 (1997-06-01), None
patent: WO 99/06321 (1999-09-01), None
Hessberger Waldemar
Jakob Harald
Lattich Juergen
Overdick Ralph
Anthony Joseph D.
Degussa GmbH
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
LandOfFree
Process for the preparation of coated granular sodium... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the preparation of coated granular sodium..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of coated granular sodium... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3786762