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

Method of preparing benzaldehyde in fluorine two-phase system

A technology of benzaldehyde and system, applied in the field of preparation of benzaldehyde, can solve the problems of complex process and large catalyst input, and achieve the effect of simple process operation

Inactive Publication Date: 2008-08-13
NANJING UNIV OF SCI & TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this preparation method are: the input amount of catalyst is large, and the catalyst needs to be filtered, eluted and dried before being reused, and the process is complicated.
However, there is no report on the application of fluorine two-phase technology to the selective oxidation of benzyl alcohol to prepare benzaldehyde.

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 of preparing benzaldehyde in fluorine two-phase system
  • Method of preparing benzaldehyde in fluorine two-phase system
  • Method of preparing benzaldehyde in fluorine two-phase system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] combine figure 1 , figure 2 , the present invention prepares the method for benzaldehyde in fluorine two-phase system, comprises the following steps:

[0021] In the first step, in a reactor containing 20g of water, add 0.04g of ytterbium oxide with a content > 99%, and 0.3g of perfluorooctane sulfonic acid with a content > 98%, and stir for 6 hours under boiling, and the reaction produces a white gel The product was washed with water to a pH value of 6-7, and the jelly was vacuum-dried at 150°C to obtain a perfluorooctane sulfonate ytterbium catalyst. In addition to ytterbium oxide, there are rare earth oxides such as lanthanum oxide, praseodymium oxide, and lutetium oxide RE 2 o 3 Rare earth metal salts of perfluorooctanesulfonic acid can be prepared by adding perfluorooctanesulfonic acid, wherein RE=Sc, Y, La~Lu.

[0022] In the second step, dissolve yt...

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 process of preparing benzaldehyde in two fluoric phase system includes the following steps: dissolving RE oxide and perfluoro octyl sulfonic acid in the molar ratio of 1 to 6-8 in water and stirring to react to obtain while jelly; water washing the jelly to pH 6-7 and vacuum drying to obtain RE metal salt of perfluoro octyl sulfonic acid; dissolving the RE metal salt serving as catalyst in perfluoro solvent at normal temperature to obtain fluoric phase containing catalyst; feeding benzyl alcohol and the fluoric phase containing catalyst into a reactor, dropping 69 wt% concentration nitric acid solution in the same molar amount to produce oxidation reaction while heating, and cooling to separate and recover the fluoric phase; neutralizing the separated mixed solution and drying to obtain benzaldehyde. The present invention has simple technological process, low catalyst consumption, environment friendship, high conversion rate, high selectivity and other advantages.

Description

a technical field [0001] The invention relates to a technology for preparing benzaldehyde by selective oxidation of benzyl alcohol, in particular to a method for preparing benzaldehyde in a fluorine two-phase system. Two background technology [0002] The selective oxidation of benzyl alcohol to benzaldehyde is an extremely important process in organic synthesis. Existing oxidation methods to achieve this process use a large amount of toxic heavy metal salts or synergistic oxidants, resulting in many disadvantages in the oxidation process, such as poor selectivity, many side reactions, unrecoverable catalysts, difficult product separation, and serious environmental pollution. Such as the method with the help of phase transfer catalyst, not only the synthesis of phase transfer agent is complicated and expensive, but also the quaternary ammonium salt has certain toxicity, which causes environmental pollution. More importantly, the application of phase transfer catalyst technol...

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): C07C47/54C07C45/29
Inventor 易文斌蔡春
Owner NANJING UNIV OF SCI & TECH