EP 0722010 A1 19960717 - Process for bleaching a micronized vegetable powder
Title (en)
Process for bleaching a micronized vegetable powder
Title (de)
Verfahren zur Bleichung von mikronisiertem pflanzlichem Pulver
Title (fr)
Procédé de blanchiment d'une poudre végétale micronisée
Publication
Application
Priority
FR 9500093 A 19950106
Abstract (en)
Process for bleaching a vegetable material in the form of a micronised powder using H2O2 in the presence of a base, comprising (a) if necessary drying the micronised powder to a moisture content of less than 30 wt.%, pref. 4-15 wt.% w.r.t. total wt., and heating to a temp. ta of 20-100 degrees C, (b) impregnating the powder simultaneously or successively (in either order) with separate solns. A and B in which soln. A is an aq. H2O2 soln. contg. an alkaline agent, in relative amts. such that the two solns. are completely absorbed by the powder so that it remains in a free flowing solid powder state with a water content of 10-50 wt.% w.r.t. total wt., and the impregnated powder has a temp. tb of 40-100 degrees C, and (c) maintaining the impregnated powder at a temp. tc of 40-100 degrees C until at least 75% of the initial amt. of H2O2 has been consumed.
Abstract (fr)
Dans ce procédé, on imprègne une poudre végétale micronisée par deux solutions distinctes A et B de façon à ce que les deux solutions soient totalement absorbées par la poudre qui reste ainsi à l'état de poudre solide, A étant constituée par une solution aqueuse de peroxyde d'hydrogène, B étant constituée par une solution aqueuse basique contenant un agent alcalin.
IPC 1-7
IPC 8 full level
D21C 9/16 (2006.01); D21H 17/02 (2006.01)
CPC (source: EP)
D21C 9/163 (2013.01); D21H 17/02 (2013.01)
Citation (search report)
- [A] US 5069919 A 19911203 - WEIBEL A THOMAS [US]
- [AD] WO 9015900 A1 19901227 - GOMEZ DANIEL [FR]
- [AD] EP 0419385 A2 19910327 - ATOCHEM ELF SA [FR]
- [A] US 2199376 A 19400430 - REICHERT JOSEPH S, et al
- [A] US 5332474 A 19940726 - MAXHAM JOHN V [US]
Designated contracting state (EPC)
AT BE CH DE ES FR GB IT LI MC PT SE
DOCDB simple family (publication)
EP 0722010 A1 19960717; CA 2166242 A1 19960707; CA 2166242 C 20000321; CN 1075144 C 20011121; CN 1136493 A 19961127; CZ 284990 B6 19990414; CZ 6296 A3 19960717; FI 960065 A0 19960105; FI 960065 A 19960707; FR 2729096 A1 19960712; FR 2729096 B1 19970207; JP H08232184 A 19960910; NO 960023 D0 19960104; NO 960023 L 19960708; PL 181230 B1 20010629; PL 312152 A1 19960708; SK 1196 A3 19960807
DOCDB simple family (application)
EP 95402756 A 19951207; CA 2166242 A 19951228; CN 96100617 A 19960105; CZ 6296 A 19960108; FI 960065 A 19960105; FR 9500093 A 19950106; JP 21796 A 19960105; NO 960023 A 19960104; PL 31215296 A 19960104; SK 1196 A 19960103