Unlock instant, AI-driven research and patent intelligence for your innovation.

Bimetallic catalyst for homogeneous methanol carhonylation and its prepn

A bimetallic catalyst, methanol carbonylation technology, applied in the direction of carbon monoxide reaction to prepare carboxylic acid, physical/chemical process catalyst, carbon monoxide or formate reaction preparation, etc., can solve the problem of increasing equipment corrosion

Inactive Publication Date: 2003-08-13
INST OF CHEM CHINESE ACAD OF SCI
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore in actual production, generally adopt to keep the partial pressure of carbon monoxide and add excessive hydrogen iodide to exist in the state of protecting rhodium (I), but this has greatly increased the corrosiveness of reaction medium to equipment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh equimolar pyridine-2-carboxylic acid and lithium hydroxide and dissolve in methanol, reflux reaction for 1 hour under stirring, cool to room temperature, add dirhodium tetracarbonyl dichloride equivalent to 1 / 2 mole of pyridine-2-carboxylic acid , continue to stir for 20 minutes, add the sodium tetraphenylborate methanol solution with the same molar number as tetracarbonyl dirhodium dichloride, and react for ten minutes, precipitate with excess ether, and wash the lemon yellow precipitate twice with methanol at 0°C. Dry under reduced pressure at room temperature to constant weight to obtain a bidentate coordinated catalyst product.

Embodiment 2

[0029] Weigh equimolar pyridine-3-carboxylic acid and lithium hydroxide, dissolve in methanol, reflux reaction for 1 hour under stirring, cool to room temperature, add tetracarbonyl dichlorodichloride equivalent to 1 / 2 mole of pyridine-3-carboxylic acid Rhodium, continue to stir for 20 minutes, add sodium acetate methanol solution with the same molar number as tetracarbonyl dirhodium dichloride, after reacting for ten minutes, precipitate and filter with excess ether to obtain precipitate, wash twice with methanol at 0°C, and reduce to room temperature Press and dry to constant weight to obtain bidentate coordinated catalyst finished product.

Embodiment 3

[0031] Weigh equimolar pyridine-4-carboxylic acid and lithium hydroxide and dissolve them in methanol, reflux reaction for 1 hour under stirring, cool to room temperature, add dirhodium tetracarbonyl dichloride equivalent to 1 / 2 mole of pyridine-4-carboxylic acid , continue to stir for 20 minutes, use excess ether to precipitate, the precipitate is filtered, washed twice with methanol at 0°C, and dried under reduced pressure at room temperature to constant weight to obtain a finished monodentate coordinated catalyst.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a homogeneous carboxylation reaction bimetal catalyst. It is a cis-dicarbonyl lawrencium and lithium dimetal compound. In said catalyst the cocatalyst assistant and polar solvent can be added to form a catalytic system, under the condition of moderate reaction said catalytic system can quickly catalyze methyl alcohol to implement carboxylation to obtain acetic acid and methyl acetate or catalyze methyl acetate to obtain acetic anhydride. Said catalyst possesses good activity and stability.

Description

technical field [0001] The invention relates to a homogeneous bimetallic catalyst for methanol carbonylation and a preparation method thereof. This catalyst has high catalytic activity and selectivity for methanol carbonylation reaction. Background technique [0002] In the early 1970s, Monsanto Corporation of the United States developed the low-pressure process of carbonylation of methanol to produce acetic acid, and successfully realized industrialization, which is an important technical route for the acetic acid industry. The reaction process is that methanol reacts with carbon monoxide to prepare acetic acid through the action of a rhodium catalyst. The catalyst uses an anionic small molecule rhodium complex such as: [Rh(CO) 2 I 2 ] - NR 4 + , [0003] [Roth, J. F. et al. Chem. Technol, 1971, 600]. Since this type of rhodium active species is unstable in the reaction, it is easy to convert into dicarbonyl tetraiodo rhodium (III) [Rh(CO) 2 I 4 ] - Anionic comple...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01J31/22C07C51/12C07C53/08C07C67/37C07C69/14
Inventor 袁国卿潘平来邹瑾
Owner INST OF CHEM CHINESE ACAD OF SCI