METHOD FOR CONCENTRATING 1-NAPHTHOL-5-SULFOACID FROM AQUEOUS SOLUTIONS Russian patent published in 2005 - IPC

FIELD: organic chemistry, analytical chemistry, chemical technology.

SUBSTANCE: invention describes a method for concentrating 1-naphthol-5-sulfoacid from aqueous solutions in the presence of ammonium sulfate. Method involves extraction with trioctylamine oxide solution taken in the concentration 0.5 mole/dm³ in toluene medium wherein trioctylamine oxide is impregnated preliminary in polyurethane foam and wherein the mass part of the solution with respect to polyurethane foam is 55-60%, and mass of impregnated tablets changes from 0.093 ± 0.001 to 0.096 ± 0.001 g per 25 cm³ of 1-naphthol-5-sulfoacid an aqueous solution. Extraction is carried out by extractive-sorption method. Under conditions of the complete extraction of 1-naphthol-5-sulfoacid from aqueous solutions the proposed method provides increase of the concentrating coefficient by above 5 times. Invention can be used in concentrating 1-naphthol-5-sulfoacid in analytical control of purified sewage in plants manufacturing dyes.

EFFECT: improved concentrating method.

2 tbl, 15 ex