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

Method for producing acetovanillone and acetic acid by biomass directional catalysis

A vanilla ethyl ketone, biomass technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of complex catalyst preparation process, high substrate purity requirements, and high reactor cost, and achieve sustainable development. The effect of good performance, low equipment requirements and low reaction temperature

Active Publication Date: 2020-06-19
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned method for preparing vanillyl ethyl ketone mainly has the following disadvantages: (1) the catalyst preparation process is complicated, the temperature is higher, and the preparation time is longer; (2) the reaction temperature is high , the process needs to use microwave heating, and the cost of the reactor is relatively high; (3) the production process produces a large amount of acid and alkali wastewater; (4) the substrate has high purity requirements

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

[0019] Mix methanol and choline chloride according to the molar ratio of 1:1 to prepare alcohol ionic liquid, add alkali lignin at a concentration of 10% by mass, and according to the amount of alkali lignin, according to alkali lignin: copper salt: 1 , the mass ratio of 10-phenanthroline is 8:1:1 and copper acetate and 1,10-phenanthroline are added, and 0.4MPa of O is charged into the reactor. 2 , reacted at 60° C. for 3 h to obtain the product, the yield of vanillyl ethyl ketone was 46.09%, the yield of acetic acid was 40.62% (calculated based on the mass of alkali lignin), and the conversion rate of alkali lignin was 90%.

Embodiment 2

[0021] Mix methanol and choline chloride at a molar ratio of 4:1 to prepare an alcohol-based ionic liquid. According to the amount of lignin in the hydrothermally pretreated corn cob, add the hydrothermal pretreatment with a lignin concentration of 5% by mass. Corn cob (hydrothermal pretreatment method is based on the method reported in Cellulose, 24(11), 4899-4909), and the mass ratio of lignin: copper salt: 1,10-phenanthroline is 4:1:1. Copper acetate and 1,10-phenanthroline, and fill the reactor with 2MPa of O 2 , reacted at 80°C for 30 minutes to obtain the product, the yield of vanillyl ethyl ketone was 23.50%, the yield of acetic acid was 37.51% (calculated based on the quality of lignin), and the conversion rate of lignin in the hydrothermally pretreated corn cob was 65%. .

Embodiment 3

[0023] Methanol and choline chloride were mixed according to the molar ratio of 8:1 to prepare the alcohol ionic liquid, according to the amount of lignin in the untreated corn cob, the lignin concentration was 1% mass percent concentration, and the untreated corn cob was added, and Add copper acetate and 1,10-phenanthroline according to lignin: copper salt: 1,10-phenanthroline mass ratio of 1:1:1, and fill the reactor with 3MPa of O 2 , reacted at 100° C. for 1 h to obtain the product, the yield of vanillyl ethyl ketone was 27.91%, the yield of acetic acid was 21.49% (calculated based on the mass of lignin), and the conversion rate of lignin in untreated corn cob was 52%.

[0024] The foregoing examples prove that by using the alcohol ionic liquid system described above, different forms of lignin substrates are directly converted into vanillyl ethyl ketone and acetic acid, the reaction temperature is low, the time is short, and the purity of the target product is high; While ...

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 discloses a method for producing acetovanillone and acetic acid by biomass directional catalysis. According to the method, by constructing an alcohol ionic liquid conversion system, lignin reaction substrates existing in various forms are directly converted into acetovanillone and acetic acid, the reaction temperature is low, the reaction time is short, and the target product selectivity is high; and while the aromatic structure in the lignin is converted into acetovanillone, the side chain is converted into a large amount of chemical acetic acid, so that the concept of atom economy is met. Compared with the existing method for industrially producing acetovanillone, the method provided by the invention has better sustainability and greater application potential.

Description

technical field [0001] The invention relates to the field of catalytic transformation of biomass, in particular to a method for producing vanillyl ethyl ketone and acetic acid through directional catalytic conversion of biomass. Background technique [0002] As a derivative of guaiacyl, one of the lignin monomers, vanillyl ethyl ketone is an important raw material for organic synthesis, which can be used to synthesize psychotropic drugs and a variety of new antimalarial drugs. At the same time, it is also an antioxidant, and it is also commonly used as a cardiotonic and diuretic in medicine. Currently, a series of propylation reactions, Friedel-Crafts acylation reactions, and selective depropylation reactions are performed on guaiacol to obtain a mixture of vanillyl ethyl ketone and isovanillyl ethyl ketone, and then the two are separated. The process of this method is complicated, and it fails to take advantage of its advantages as a derivative of lignin monomer. With the...

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): C07C45/00C07C49/84C07C51/00C07C53/08
CPCC07C45/00C07C51/00C07C49/84C07C53/08
Inventor 余强宋振龙陈小燕张宇王闻孙永明王忠铭
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI