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US 4,233,235 AGranted
Method for making diperoxyacids
AssigneeThe Procter & Gamble Company
InventorsJames B. Camden, Mark L. McCarty
Life of this patent
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Abstract
A continuous process for making aliphatic diperoxyacids comprising continuously adding a dibasic acid having from about 8 to about 16 carbon atoms, sulfuric acid, hydrogen peroxide and water to a continuous stirred reactor. The diperoxyacid formed is continuously withdrawn from the reactor.
Claims10
A continuous process for making diperoxyacids of the formula ##STR4## wherein n is from about 6 to about 14, said diperoxyacids having a crystalline form and an average crystal size substantially greater than about 19 microns, comprising:
- (a) continuously adding to a stirred reactor of temperature from about 15.degree. C. to about 45.degree. C. the following materials:
- (1) hydrogen peroxide;
- (2) water;
- (3) sulfuric acid;
- and
- (4) a dibasic acid of the formula ##STR5## wherein n is from about 6 to about 14;
- (b) continuously withdrawing from the reactor diperoxyacid product formed as a result of the oxidation of the dibasic acid;
- (c) filtering the diperoxyacid product;
- and
- (d) washing the diperoxyacid product with water and drying it;
- wherein the inlet flow rates to the reactor of sulfuric acid, hydrogen peroxide and water are sufficient to maintain a liquid concentration of about 60% to about 80% sulfuric acid, about 0.5% to about 15% hydrogen peroxide, and about 5% to about 39.5% water in the reactor.
8 more elements
Dependencies are inferred from the claim text.