Process for preparing carboxylic acid anhydrides
AssigneeHalcon International, Inc.
InventorNabil Rizkalla
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Abstract
A carboxylic acid anhydride such as acetic anhydride, is prepared from a carboxylate ester or a hydrocarbyl ether in carbonylation processes comprising the use of a halide, carbon monoxide and a Group VIII noble metal in the presence of promoters comprising at least one metal of Groups IVB, VB, and VIB or a non-noble metal of Group VIII, or their compounds and an organo-nitrogen compound or an organo-phosphorus compound wherein the nitrogen and phosphorus are trivalent.
Claims26
In a process for the preparation of an anhydride of a monocarboxylic acid by reacting carbon monoxide, a halide which is an iodide or bromide and a compound selected from the group consisting of a carboxylate ester and a hydrocarbyl ether, under substantially anhydrous conditions in the presence of a Group VIII noble metal catalyst the improvement which comprises carrying out the reaction in the presence of a multiple promoter comprising (1) at least one metal of Group VIB or a non-noble metal of Group VIII and (2) an organo-nitrogen compound or an organo-phosphorus compound wherein the nitrogen and the phosphorus are trivalent.
In a process for the preparation of a lower alkanoic anhydride by reacting carbon monoxide, a halide which is an iodide or a bromide, and a compound selected from the group consisting of a lower alkyl lower alkanoate and a lower alkyl ether, under substantially anhydrous conditions in the presence of a Group VIII noble metal catalyst, the improvement which comprises carrying out the reaction in the presence of a multiple promoter comprising (1) at least one metal of Group VIB or a non-noble metal of Group VIII and (2) an organo-nitrogen compound or an organo-phosphorus compound wherein the nitrogen and the phosphorus are trivalent.
In a process for the preparation of acetic anhydride by reacting carbon monoxide, a halide which is an iodide or a bromide and a compound slected from the group consisting of methyl acetate and dimethyl ether, under substantially anhydrous conditions in the presence of a Group VIII noble metal, the improvement which comprises carrying out the reaction in the presence of a multiple promoter comprising (1) at least one metal of Group VIB or a non-noble metal of Group VIII and (2) an organo-nitrogen compound or an organo-phosphorus compound wherein the nitrogen and the phosphorus are trivalent.
Dependencies are inferred from the claim text.