To provide a method for continuously regenerating waste sulfuric acid containing organic matter generated during production of an aromatic hydrocarbon-formaldehyde resin, characterized in that colorless regenerated sulfuric acid is obtained by continuously reducing a CODMn value through hydrogen peroxide treatment and continuously concentrating it so that no hydrogen peroxide remains, and the obtained regenerated sulfuric acid is reused as a catalyst for producing aromatic hydrocarbon-formaldehyde resin or utilized for drainage neutralization.
Waste sulfuric acid containing organic matter generated during production of the aromatic hydrocarbon-formaldehyde resin is added with hydrogen peroxide by two to ten times moles that of remaining formaldehyde. The resulting material is reaction treated at 105 to 115°C and under pressure of 710 mmHg to atmospheric pressure while continuously distilling low boiling point components away. Thereafter, the resultant material is concentrated at 150 to 190°C and under pressure of 150 mmHg to atmospheric pressure.
MORI NAOSHI
KITA SEIJI
OGIWARA MASASHI
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