Process for the preparation of adipic acid
AssigneeEastman Kodak Company
InventorsGuy R. Steinmetz, Norma L. Lafferty, Charles E. Sumner, Jr.
Life of this patent
Estimating the term…
Abstract
Disclosed is an improved process for the preparation of adipic acid by the air oxidation of cyclohexane in the presence of acetic acid and a catalyst system comprising cobalt and zirconium and/or hafnium.
Claims4
Process for the preparation of adipic acid which comprises contacting cyclohexane with air in the presence of acetic acid and a catalytic amount of a combination of a soluble cobalt compound and a soluble zirconium and/or hafnium compound at a temperature of about 80.degree. to 160.degree. C. and a pressure of about 2 to 100 bar, wherein the atomic ratio of Zr:Co, Hf:Co or Zr +Hf:Co is about 0.001 to 1,000.
Process for the preparation of adipic acid which comprises contacting cyclohexane with air at a temperature of about 90.degree. to 120.degree. C. and a pressure of about 2 to 30 bar in the presence of acetic acid containing a soluble cobalt compound in an amount which gives a cobalt concentration of about 0.01 to 0.50 weight percent based on the weight of the acetic acid and a soluble zirconium compound in an amount which gives a Zr:Co atomic ratio of about 0.01 to 10.0.
Dependencies are inferred from the claim text.