Process for the preparation of practically formic acid-free acetic acid
AssigneeHoechst Aktiengesellschaft
InventorsGunter Roscher, Helmut Schaum, Heinz Schmitz
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Abstract
A process is provided for the preparation of practically formic acid-free acetic acid by oxidation of acetaldehyde in the liquid phase with oxygen or oxygen-containing gases in the presence of mixtures of cobalt, nickel and manganese salts as catalysts.
Claims7
In a process for the preparation of acetic acid substantially free of formic acid by oxidation of acetaldehyde with oxygen in the liquid phase in the presence of a catalyst at a temperature of from 40.degree. C. to 120.degree. C., the improvement which comprises oxidizing liquid acetaldehyde in the presence of a catalytic mixture of cobalt, nickel, and manganese compounds, one of said compounds being present in an amount up to five times the sum of the amounts of the other compounds.
In a process for the preparation of acetic acid substantially free of formic acid by oxidation of acetaldehyde with oxygen in the liquid phase in the presence of a catalyst at a temperature of from 40.degree. C. to 120.degree. C., the improvement which comprises oxidizing liquid acetaldehyde in the presence of a catalytic mixture of cobalt, nickel and manganese compounds, one of said compounds being present in an amount up to five times the sum of the amounts of the other compounds;
- separating crude acetic acid containing catalytic mixture;
- distilling said crude acetic acid to obtain a distillate of low-boiling substances and acetic acid;
- distilling the distillate of said second distillation and further distilling the distillate of the third distillation;
- and returning to the oxidation zone the bottom product of said fourth distillation.
Dependencies are inferred from the claim text.