Method for purification of cresidine sulfonic acid by solvent ex

Details Method for purification of cresidine sulfonic acid by solvent ex Method for purification of cresidine sulfonic acid by solvent ex

1981-11-09

1984-03-13

Spear, Jr., Frank A.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

B01D 1104

Patent

active

044366256

ABSTRACT:
A method for removing residual cresidine from impure p-cresidine sulfonic acid which impure p-cresidine sulfonic acid contains from above about two parts per billion to about 1500 parts per million of cresidine. The method comprises contacting an aqueous solution of the impure p-cresidine sulfonic acid with sufficient liquid hydrocarbon of from five to eighteen carbon atoms for a sufficient time to extract the cresidine from the p-cresidine sulfonic acid to a concentration of less than two parts per billion of cresidine in the p-cresidine sulfonic acid.

REFERENCES:
Dictionary of Organic Compounds, vol. 1, 1965, p. 109.
Hamilton et al., Industrial Toxicology, 1949, pp. 450-454.
Wilson et al., Textbook of-Pharmaceutical Chemistry, 1954, p. 483.

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