| 摘要 |
1378944 Solutions of dyes CIBA-GEIGY AG 14 Feb 1972 [15 Feb 1971] 6796/72 Heading C4P [Also in Division D1] Solutions of water-soluble anionic and cationic dyes are concentrated by cooling to a temperature below 0‹ C., the ice formed thereby being crushed and removed from the concentrated solution of the dye. Cooling may be effected down to - 30‹ C., separation of the ice may be effected by centrifuging in a screening centrifuge, the final solution preferably containing 3 to 20 per cent by weight of dye. |
