METHOD FOR PREPARING PHTHALIC ANHYDRIDE FROM VAT WASTE RESIN IN MANUFACTURE OF PHTHALIC ANHYDRIDE Russian patent published in 2005 - IPC

Abstract RU 2265589 C2

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to the improved method for preparing phthalic anhydride from vat waste resin in manufacture of phthalic anhydride. Method involves treatment of vat waste resin in manufacture of phthalic anhydride with dimethylformamide at stirring at temperature 60-70°C and isolation of phthalic anhydride. Resin is a toxic waste in manufacture. Using a solvent under optimal conditions in resin treatment provides the wasteless manufacture and value product - phthalic acid is recovered. Phthalic acid is used in synthesis of pigment, phthalocyanine.

EFFECT: improved preparing method.

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RU 2 265 589 C2

Authors

Shirjaeva L.S.

Shirjaev O.M.

Mikhajlov V.A.

Dates

2005-12-10—Published

2003-12-19—Filed