Lithium pyridine carboxylate-rhodium acetate complex catalyst for synthesizing acetic acid and acetic anhydride through carbonylation, and preparation method and application thereof

Abstract

The invention belongs to the field of synthesis of acetic acid and acetic anhydride through carbonylation, and relates to a lithium pyridine carboxylate-rhodium acetate complex catalyst for synthesizing acetic acid and acetic anhydride through carbonylation of methanol, and a preparation method and application of the catalyst. When the catalyst is used for catalyzing carbonylation reaction of the methanol to prepare the acetic acid and catalyzing carbonylation reaction of methyl acetate to prepare the acetic anhydride, the catalyst has good catalytic activity and reaction stability. Under the relative mild conditions, the catalyst can catalyze the carbonylation of the methanol to prepare the acetic acid and catalyze the carbonylation of the methyl acetate to prepare the acetic anhydride at high speed and high selectivity. The catalyst has an active ingredient of rhodium; and a coordination structure formed by the rhodium active ingredient and the lithium pyridine carboxylate is shown as the specifications.

Description

technical field [0001] The invention belongs to the field of carbonylation of acetic acid and acetic anhydride, and relates to a lithium pyridine carboxylate-rhodium acetate complex catalyst for carbonylation of methanol to acetic acid and methyl acetate carbonylation of acetic anhydride, and a preparation method and application of the catalyst. Background technique [0002] Under the effect of homogeneous rhodium catalyst, methyl alcohol low-pressure carbonylation reaction prepares acetic acid is the invention of the people (US 3 769 329) of U.S. Monsanto company Paulik et al. in the early 1970s, and this invention has opened up a new important way for the carbonylation of methanol process route. On this basis, later Halcon (BE 819 455) Ealtman, Ajinamoto (Japan Kokai 50 / 30,820), Showa Denko (Japan Kokai 50 / 47,922), BP (B.Von Schlotheim, Chem.Industrie 1994, 9 / 89.80) and Hoechst (DE 24 50 965) converts the same [Rh(CO) 2 I 2 ] - A breakthrough has been made in the resea...

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Problems solved by technology

Higher activity and good selectivity are the obvious advantages of this type of catalyst; however, the instability of this type of catalyst tends to generate trivalent rhodium precipitation, especially at a higher temperature that is conducive to the reaction, or in the flash separation of part of the carbon monoxide fraction. This is especially true when the pressure is low, and the above-mentioned shortcomings have been recognized by people.

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