Catalytic system used for homogeneous hydroxylation reaction and its manufacturing method and application

A catalytic system, technology of carbonylation reaction, applied in the direction of carbon monoxide reaction to prepare carboxylic acid, physical/chemical process catalyst, organic compound/hydride/coordination complex catalyst, etc., can solve the problem of consumption of large promoter methyl iodide, catalyst solubility Not good, unable to achieve industrialization and other problems, to achieve good catalytic activity and stability, reduce the formation of precipitates, and coordinate stable effects
CN1517150AInactive Publication Date: 2004-08-04INST OF CHEM CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF CHEM CHINESE ACAD OF SCI
Publication Date
2004-08-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

A homologeous catalyst system for the hydroxylation reaction of methanol to obtain acetic acid or the carbonylating reaction of methyl acetate to obtain ethylanhydride is composed of the primary catalyst (rhodium acetate (or nitrate) as coordination center and potassium), cocatalyst (iodomethane), additive (lithium iodide, potassium iodide, or lithium acetate), and polar solvent (acetic acid, ethylanhydride, methyl acetate, or water). Its preparing process includes dissolving picolinic acid and hydrated potassium in methanol or water to obtain organic potassium ligand, dissolving in water or methanol solution, and dripping rhodium solution.
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Description

technical field

[0001] The present invention relates to a catalytic system for homogeneous hydroxylation reactions.

[0002] The present invention also relates to the preparation method of the main catalyst in the above catalytic system.

[0003] The present invention also relates to the application of the above-mentioned catalytic system in the carbonylation reaction of methanol and the carbonylation reaction of methyl acetate. Background technique

[0004] Since the 1970s, the Monsanto Company of the United States successfully invented the low-pressure methanol carbonylation acetic acid process, which gradually replaced the two-step process such as the ethylene process, and the acetic acid industry has developed rapidly. The active center of the catalyst used in this method is diiodide rhodium dicarbonyl, such as [Rh(CO) 2 I 2 ] - N + R 4 , [Roth, J.F.et al.Chem.Technol., 1971,600], this type of complex is very unstable in the reaction process, and it is very easy to...

Claims

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