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

A technology of lithium pyridine carboxylate and catalyst, which is applied in the direction of organic compound/hydride/coordination complex catalyst, catalyst activation/preparation, carboxylic anhydride preparation, etc. It can solve the problems of catalyst instability and achieve excellent catalytic activity and reaction The effect of stability

Inactive Publication Date: 2011-10-19
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 temperatur

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 1 molar part of pyridine-2,3 lithium dicarboxylate in 100 molar parts of acetic acid, add 1 molar part of rhodium acetate under stirring, continue stirring for about 20 minutes, then add an excess amount of diethyl ether relative to the volume of the reaction product Precipitate and filter to obtain pyridine-2,3 dicarboxylate lithium-rhodium acetate complex catalyst solid.

[0021] Using the same method as above, replace lithium pyridine-2,3 dicarboxylate with lithium pyridine-2,6 dicarboxylate or lithium pyridine-3,5 lithium dicarboxylate to obtain pyridine-2,6 lithium dicarboxylate- Rhodium acetate complex catalyst or pyridine-3,5 lithium dicarboxylate-rhodium acetate complex catalyst.

Embodiment 2

[0023] Dissolve 1 molar part of pyridine-2,6 dicarboxylate lithium in 200 molar parts of acetic acid, add 1 molar part of rhodium acetate under stirring, continue stirring for about 20 minutes, then add an excess amount of diethyl ether relative to the volume of the reaction product Precipitate and filter to obtain pyridine-2,6 dicarboxylate lithium-rhodium acetate complex catalyst solid.

[0024] Using the same method as above, replace lithium pyridine-2,6 dicarboxylate with lithium pyridine-2,3 lithium dicarboxylate or lithium pyridine-3,5 dicarboxylate to obtain pyridine-2,3 lithium dicarboxylate- Rhodium acetate complex catalyst or pyridine-3,5 lithium dicarboxylate-rhodium acetate complex catalyst.

Embodiment 3

[0026] In a 250ml autoclave, add pyridine-2 prepared in Example 1, 0.30 g of lithium dicarboxylate-rhodium acetate complex catalyst, 0.8 mol of methanol, 0.19 mol of methyl iodide, 1.12 mol of acetic acid, and 2.1 g of lithium iodide; Carbon monoxide was introduced, the temperature was raised to 150° C., the stirring speed was 500 rpm, the reaction pressure was controlled at 3.0 MPa, and the reaction time was 13 minutes to obtain acetic acid. The conversion rate of methanol is 96%, and the space-time yield of acetic acid is 20.1molAcOH / L.h.

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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...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01J37/00C07C53/08C07C51/12C07C53/12C07C51/56
Inventor 袁国卿闫芳李峰波钱庆利
Owner INST OF CHEM CHINESE ACAD OF SCI
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