Ultrafiltration purification of solution of polymeric anthraquin

Details Ultrafiltration purification of solution of polymeric anthraquin Ultrafiltration purification of solution of polymeric anthraquin

1976-11-18

1978-05-09

Spear, Jr., Frank A.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

260369, B01D 1300

Patent

active

040885720

ABSTRACT:
The ultrafiltration purification of aqueous solutions of polymeric anthraquinone colorants, wherein low molecular weight impurities are removed in an ultrafiltrate leaving a purified anthraquinone colorant-bearing retentate, is carried out with improved efficiency when pyridine is present and maintained in the aqueous solutions at a level of from 1 to 20% by volume.

REFERENCES:
patent: 1890040 (1932-12-01), Luttringhaus et al.
patent: 2660580 (1953-11-01), Von
Porter et al., "Membrane Ultrafiltration", from Chem. Tech., Jan., 1971, pp. 56-63.

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