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B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
B01D—SEPARATION
B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
Verfahren zur Reinigung organischer Farbstoffe undVerfahren zur Reinigung organischer Farbstoffe und deren Zwischenprodukte unter Wahrung oder Erzeugu deren Zwischenprodukte unter Wahrung oder Erzeugung des kolloidalen Zustandes. ng des kolloidalen Zustandes.