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US 5,214,205 AGranted
Process for the preparation of acetic anhydride from methyl formate
AssigneeSollac, A French Body Corporate
InventorsYves Castanet, Bruno Seuillet, Andre Mortreux, Francis Petit
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Abstract
The invention relates to a process for the preparation of acetic anhydride, characterized in that a gas containing essentially CO, at a pressure of at least 1 MPa, is reacted with methyl formate in the presence of a) a rhodium-based catalyst, b) two iodine-containing promoters of different kind, successively ionic and covalent, and c) an N-substituted cyclic amide as solvent.
Claims12
A process for the preparation of acetic anhydride, wherein a gas containing essentially CO, at a pressure of at least 1 MPa, is reacted with methyl formate in the presence of
- a) a rhodium-based catalyst;
- b) a first iodine-containing promoter of ionic-type, which is present at the beginning of reaction;
- c) a second iodine-containing promoter of covalent-type, which is added during reaction;
- and
- d) an N-substituted cyclic amide as solvent, wherein the proportion of solvent relative to methyl formate is higher than 2/3 (v/v).
2 more elements
Dependencies are inferred from the claim text.