Salt addition in ultrafiltration purification of solutions of polymeric colorants
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United States of America Patent
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Feb 19, 1980
Grant Date -
N/A
app pub date -
Nov 18, 1976
filing date -
Nov 18, 1976
priority date (Note) -
Expired
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Abstract
The ultrafiltration purification of aqueous solutions of polymeric colorants, wherein low molecular weight impurities are removed in an ultrafiltrate leaving a purified polymeric colorant-bearing retentate, is carried out with improved efficiency when, during at least two diavolumes of ultrafiltration, the salt content of the retentate is maintained above about 1% by weight.
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