Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Xylan-base carbon-based solid acid and method for catalyzed synthesis of benzoxanthenes compounds by using same

A xylan-based carbon-based, solid acid catalyst technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, catalytic reactions, etc., can solve product separation difficulties, pollution of the environment, and corrosion of equipment. and other problems, to achieve the effect of high catalytic activity, simple operation and low cost

Inactive Publication Date: 2017-01-04
SOUTH CHINA UNIV OF TECH
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon-based solid acid catalyst is a new type of solid acid catalyst, which can solve the problems of difficult separation of products, corrosion of equipment, and environmental pollution when liquid inorganic acids (such as sulfuric acid and hydrochloric acid) are used as acid catalysts in industry.

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
  • Xylan-base carbon-based solid acid and method for catalyzed synthesis of benzoxanthenes compounds by using same
  • Xylan-base carbon-based solid acid and method for catalyzed synthesis of benzoxanthenes compounds by using same
  • Xylan-base carbon-based solid acid and method for catalyzed synthesis of benzoxanthenes compounds by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Accurately weigh 3g of xylan hemicellulose in a crucible and place it in a tube furnace. Under a nitrogen atmosphere, heat it from room temperature to 200°C and keep it warm for 180min. After the reaction is completed, cool it to room temperature to obtain a black powdery incomplete carbonization product of xylan hemicellulose;

[0036] (2) The product obtained in step (1) is mixed with concentrated sulfuric acid in a ratio of 1:30 (g:mL) and then placed in a reaction kettle with a polytetrafluoroethylene liner. Under a nitrogen atmosphere, the reaction The system was heated from room temperature to 250°C for 12 hours;

[0037] (3) Add the reaction mixture obtained in step (2) dropwise to 1000 mL of ice-water mixture under constant stirring. After the dropwise addition, wait for the solution to cool to room temperature, filter, and fully wash the solid with hot water (>80°C) The substance was dried until the eluent was neutral, and then vacuum-dried at 80° C. to ob...

Embodiment 2

[0039] (1) Accurately weigh 3g of xylan hemicellulose in a crucible and place it in a tube furnace. Under a nitrogen atmosphere, heat it from room temperature to 350°C and keep it warm for 90 minutes. After the reaction is completed, cool it to room temperature to obtain a black powdery incomplete carbonization product of xylan hemicellulose;

[0040] (2) The product obtained in step (1) is mixed with concentrated sulfuric acid in a ratio of 1:30 (g:mL) and then placed in a reaction kettle with a polytetrafluoroethylene liner. Under a nitrogen atmosphere, the reaction The system was heated from room temperature to 150°C for 15 hours;

[0041] (3) Add the reaction mixture obtained in step (2) dropwise to 1000 mL of ice-water mixture under constant stirring. After the dropwise addition, wait for the solution to cool to room temperature, filter, and fully wash the solid with hot water (>80°C) The substance was dried until the eluent was neutral, and then vacuum-dried at 80° C. t...

Embodiment 3

[0043] (1) Accurately weigh 3g of xylan hemicellulose in a crucible and place it in a tube furnace. Under a nitrogen atmosphere, heat from room temperature to 400°C and keep it warm for 60 minutes. After the reaction is completed, cool to room temperature to obtain black powdery incomplete carbonization product of xylan hemicellulose;

[0044] (2) The product obtained in step (1) is mixed with concentrated sulfuric acid in a ratio of 1:30 (g:mL) and then placed in a reaction kettle with a polytetrafluoroethylene liner. Under a nitrogen atmosphere, the reaction The system was heated from room temperature to 100°C for 18 hours;

[0045] (3) Add the reaction mixture obtained in step (2) dropwise to 1000 mL of ice-water mixture under constant stirring. After the dropwise addition, wait for the solution to cool to room temperature, filter, and fully wash the solid with hot water (>80°C) The substance was dried until the eluent was neutral, and then vacuum-dried at 80° C. to obtain...

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 belongs to the technical field of organic catalytic synthesis, and discloses xylan-base carbon-based solid acid and a method for catalyzed synthesis of benzoxanthenes compounds by using same. The xylan-base carbon-based solid acid catalyst is prepared by the steps of enabling xylan hemicellulose to have a reaction for 60-180min at the temperature of 200-400 DEG C to obtain an incomplete carbonized product; after that, enabling the obtained incomplete carbonized product to react with concentrated sulfuric acid for 12-18h at the temperature of 100-250 DEG C; dripping the obtained reaction mixture into a mixture of ice and water under the condition of stirring, filtering, and washing and drying the solid matter. The benzoxanthenes compounds are obtained by adding the xylan-base carbon-based solid acid catalyst, aldehydes compounds, 2-naphthol and 1,3-cyclohexanediones compounds into a reactor, and carrying out a reaction for 1-3h at the temperature of 70-110 DEG C. As a catalyst, the xylan-base carbon-based solid acid has the advantages of environmental friendliness, bio-compatibility, high catalytic activity, recyclability, and the like.

Description

technical field [0001] The invention belongs to the technical field of organic catalytic synthesis, in particular to a xylan-based carbon-based solid acid and a method for catalyzing and synthesizing benzoxanthene compounds therefrom. Background technique [0002] Oxygen-containing heterocyclic compounds are widely found in various natural products and pharmaceutically active molecules, and they are also important intermediates in organic synthesis. The synthesis and transformation of oxygen-containing heterocycles is of great significance to the fields of medical development and natural product synthesis. As an important class of oxygen-containing heterocyclic compounds, xanthenes were mainly used as chemical fluorescent fuels in the fields of laser technology and biomolecular fluorescent labeling in the early days. With the in-depth development of research, researchers have found that xanthenes, especially benzoxanthenes, have rich biological activities and medicinal valu...

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): B01J31/02C07D311/78
CPCC07D311/78B01J31/0229B01J2231/42
Inventor 彭新文马纪亮邓青钟林新林佳纯孙润仓
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com