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

Method for producing 2,4,5-trialkyl-benzaldehyde

A technology for trialkylbenzene and formaldehyde, which is used in the production field of 2,4,5-trialkylbenzaldehyde

Inactive Publication Date: 2004-12-01
NIPPON SHOKUBAI CO LTD
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, 1,2,4-trialkylbenzenes are not addressed in this paper, and there is room for further improvement of the technology to increase the efficiency of production of 2,4,5-trialkylbenzaldehydes

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

[0024] Add 6.7 grams of 1,2,4-trimethylbenzene into a 100 mL autoclave, and then slowly add 50 grams of trifluoromethanesulfonic acid. After purging with carbon monoxide, the reaction was carried out at a carbon monoxide partial pressure of 5 MPa and 0° C. for 90 minutes. After the reaction, the reaction compound was poured into ice water, and then the product was extracted with ether. The ether solution thus obtained was analyzed by gas chromatography. The results of the analysis showed the formation of 2,4,5-trimethylbenzaldehyde in a 93% yield on a molar basis. The selectivity of 2,4,5-trimethylbenzaldehyde over converted 1,2,4-trimethylbenzene was 98%.

[0025] From the analysis results of GC and NMR, it can be seen that neither positional isomers nor by-products produced by the disproportionation reaction were detected. Although there were two trace by-product peaks, mass spectral analysis revealed that these were high molecular species, presumed to be dimers and trimers...

Embodiment 2-11

[0027] The reaction of Example 1 was carried out with the reaction temperature, the ratio of trifluoromethanesulfonic acid to 1,2,4-trimethylbenzene, the pressure of carbon monoxide, the reaction time and the stirring rate respectively changed as shown in Table 1. The results are listed in Table 1.

[0028] The values ​​in Table 1 are calculated by the following formula:

[0029] Catalyst / substrate=[the amount of added trifluoromethanesulfonic acid (in moles)] / [the amount of added 1,2,4-trimethylbenzene (in moles)]

[0030] Conversion ratio=[the amount of 1,2,4-trimethylbenzene reacted (in moles)] / [the amount of 1,2,4-trimethylbenzene added (in moles)]×100

[0031] Yield=[the amount of 2,4,5-trimethylbenzaldehyde generated (in moles)] / [the amount of 1,2,4-trimethylbenzene added (in moles)]×100

[0032] Selectivity=[the amount of 2,4,5-trimethylbenzaldehyde (in moles)] / [the amount of 1,2,4-trimethylbenzene reacted (in moles)]×100

[0033] Example

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

It is an object of the present invention to provide a production method of 2,4,5-trialkylbenzaldehyde from 1,2,4-tribenzaldehyde at low cost and safely. The present invention provides a production method of a 2,4,5-trialkylbenzaldehyde which comprises carbonylating a 1,2,4-trialkylbenzene with carbon monoxide in the presence of a catalyst, said catalyst comprising trifluoromethanesulfonic acid.

Description

technical field [0001] The present invention relates to the production method of 2,4,5-trialkylbenzaldehyde. More specifically, the present invention relates to a process for the production of 2,4,5-trialkylbenzaldehydes as intermediates for a number of chemical products, in particular as raw materials for pyromellitic anhydride. Background technique [0002] Aromatic aldehydes, which are intermediates of many chemical products, are compounds of great utility, and specifically, trialkylbenzaldehydes, which are precursors of aromatic polycarboxylic acids, are intermediates that occupy an important position in industry. In particular, 2,4,5-trialkylbenzaldehyde is a very important compound as a raw material of pyromellitic anhydride. In recent years, the importance of this compound as a resistant resin, plasticizer, and epoxy resin curing agent has increased. steadily rising. [0003] Known production methods of trialkylbenzaldehydes include meth...

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 Patents(China)
IPC IPC(8): C07C45/49
CPCC07C45/49C07C47/542
Inventor 徐柏庆大轩康夫高桥典
Owner NIPPON SHOKUBAI CO LTD