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

Method for preparing aromatic aldehyde

A technology of aromatic aldehydes and aromatic hydrocarbons, applied in the field of preparation of aromatic aldehydes, can solve the problems of low conversion rate of aromatic hydrocarbons and low yield of aromatic aldehydes

Active Publication Date: 2019-12-06
CHINA PETROLEUM & CHEM CORP +1
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the low problem of aromatics conversion rate and aromatic aldehyde yield, and a new method for synthesizing aromatic aldehydes is provided, which has the characteristics of high aromatics conversion rate and high aromatic aldehyde yield

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing aromatic aldehyde
  • Method for preparing aromatic aldehyde
  • Method for preparing aromatic aldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Add Me to the 250mL autoclave 3 NCl-AlCl 3 81g, Rh(CH containing 15g Rh 3 COO) 3 and RuCl with 4gRu 3 , the air in the kettle is first filled with N 2 Replaced 3 times, then replaced 3 times with CO gas; stirred at 500rpm for 1h; added 50g of toluene, and replaced 3 times with CO gas; raised the temperature to 50°C, kept the CO pressure at 2.0MPa, stirred at 500rpm, and reacted for 5h to obtain p-methyl Product mixture of benzaldehyde.

[0046] For ease of comparison and illustration, the conversion rate of catalyst formula, toluene and the selectivity of p-toluene are listed in table 1.

Embodiment 2

[0048] Add Me to the 250mL autoclave 3 NCl-AlCl 3 81g, Rh(CH containing 15g Rh 3 COO) 3 and Zn(CN) containing 4gZn 2 , the air in the kettle is first filled with N 2 Replaced 3 times, then replaced 3 times with CO gas; stirred at 500rpm for 1h; added 50g of toluene, and replaced 3 times with CO gas; raised the temperature to 50°C, kept the CO pressure at 2.0MPa, stirred at 500rpm, and reacted for 5h to obtain p-methyl Product mixture of benzaldehyde.

[0049] For ease of comparison and illustration, the conversion rate of catalyst formula, toluene and the selectivity of p-toluene are listed in table 1.

Embodiment 3

[0051] Add Me to the 250mL autoclave 3 NCl-AlCl 3 81g, Co(CH containing 15g Co 3 COO) 2 and RuCl with 4g Ru 3 , the air in the kettle is first filled with N 2 Replaced 3 times, then replaced 3 times with CO gas; stirred at 500rpm for 1h; added 50g of toluene, and replaced 3 times with CO gas; raised the temperature to 50°C, kept the CO pressure at 2.0MPa, stirred at 500rpm, and reacted for 5h to obtain p-methyl Product mixture of benzaldehyde.

[0052] For ease of comparison and illustration, the conversion rate of catalyst formula, toluene and the selectivity of p-toluene are listed in table 1.

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 method for preparing aromatic aldehyde. The invention mainly aims to solve the problems of low conversion rate of aromatic hydrocarbon and low yield of aromatic aldehyde inthe prior art. The method comprises a step of subjecting aromatic hydrocarbon and CO to a carbonylation reaction under the catalysis of a catalyst so as to obtain aromatic aldehyde, wherein the catalyst comprises ionic liquid, a compound active metal and a compound auxiliary metal, the ionic liquid is quaternary ammonium salt type ionic liquid, the compound active metal comprises Zr, and the compound auxiliary metal comprises Ru. With such a technical scheme, the above technical problems are well solved, and the method can be used for industrial production of aromatic aldehyde.

Description

technical field [0001] The present invention relates to a process for the preparation of aromatic aldehydes. Background technique [0002] p-Tolualdehyde is one of the aromatic aldehydes, that is, 4-methylbenzaldehyde (p-Tolualdehyde, PTAL for short), is a colorless or light yellow transparent liquid with a gentle floral and almond aroma, which is harmful to the eyes and skin There is a certain irritation. P-tolualdehyde can be oxidized with high selectivity to synthesize terephthalic acid, and it is also an important intermediate in organic synthesis, which is widely used in the fields of fine chemicals and medicine. [0003] The synthesis methods of alkylaromatic aldehydes mainly include direct high temperature oxidation, indirect electrosynthesis and carbonylation. Take the synthesis of PTAL as an example: [0004] The direct high-temperature oxidation method uses p-xylene as raw material to prepare PTAL through photobromination, alkaline hydrolysis, and hydrogen perox...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/50C07C47/542B01J31/30B01J31/26
CPCC07C45/50B01J31/30B01J31/26C07C47/542
Inventor 王艳红肖忠斌杨运信
Owner CHINA PETROLEUM & CHEM CORP