Method for preparing bisphenol F by using 1-alkyl-3-methylimidazole acidic ionic liquid

A technology of acidic ionic liquids and methylimidazoles, applied in chemical instruments and methods, preparation of organic compounds, production of bulk chemicals, etc., can solve problems such as rapid decline in catalyst activity, impact on product scale application, and short catalyst life. To achieve the effect of avoiding difficult recycling and low utilization rate, maintaining good catalytic activity, and being easy to recycle and reuse

Inactive Publication Date: 2012-07-18
XIANGTAN UNIV
View PDF13 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Patents JP08268943, JP08198790 and other patents report the catalytic synthesis of bisphenol F with organic acids such as oxalic acid and acetic acid, with an acid-aldehyde ratio of 5-50 and a temperature of 60-100°C. This method has a mild reaction and is less corrosive to equipment, but side reactions Many, the phenolic ratio is too high, and the yield is relatively low
[0007] Patent JP11269113 reports a method for synthesizing bisphenol F using zeolite molecular sieves as a catalyst, and patent CN101987812A discloses a method for synthesizing bisphenol F using mesoporous molecular sieves with a silicon-aluminum ratio of 60:1 to 150:1 as a catalyst. Product separation and catalyst recovery are relatively easy, but the phenol-formaldehyde ratio and reaction temperature are high, the reaction is dif

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 bisphenol F by using 1-alkyl-3-methylimidazole acidic ionic liquid
  • Method for preparing bisphenol F by using 1-alkyl-3-methylimidazole acidic ionic liquid
  • Method for preparing bisphenol F by using 1-alkyl-3-methylimidazole acidic ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 0.1mol 1-alkyl-3-methylimidazole acidic ionic liquid [Hmin][HSO 4 ] and 0.6mol phenol into the three-necked flask, the temperature was raised to 90°C, and 0.1mol formaldehyde was added dropwise. And samples were taken and analyzed at 0.5h, 1h, 2h, 3h, 4h, 5h, and 6h respectively. After the reaction was finished, it was cooled, washed with water and separated into layers. The aqueous phase was dehydrated by rotary evaporation under reduced pressure, and the remaining ionic liquid was recycled; the organic phase was distilled under reduced pressure to recover phenol to obtain a crude product, which was recrystallized from xylene to obtain bisphenol F product with a yield of 70.68%.

Embodiment 2

[0024] Take 0.1mol 1-alkyl-3-methylimidazole acidic ionic liquid [Emin][HSO 4 ] and 0.7 mol of phenol were added to the three-necked flask, the temperature was raised to 80°C, and 0.1 mol of formaldehyde was added dropwise. And samples were taken and analyzed at 0.5h, 1h, 2h, 3h, 4h, 5h, and 6h respectively. After the reaction was finished, it was cooled, washed with water and separated into layers. The aqueous phase was dehydrated by rotary evaporation under reduced pressure, and the remaining ionic liquid was recycled; the organic phase was distilled under reduced pressure to recover phenol to obtain a crude product, which was recrystallized from xylene to obtain bisphenol F product with a yield of 65.53%.

Embodiment 3

[0026] Take 0.1mol 1-alkyl-3-methylimidazole acidic ionic liquid [Bmin][HSO 4 ] and 0.8mol of phenol were added to the three-necked flask, the temperature was raised to 60°C, and 0.05mol of formaldehyde was added dropwise. And samples were taken and analyzed at 0.5h, 1h, 2h, 3h, 4h, 5h, and 6h respectively. After the reaction was finished, it was cooled, washed with water and separated into layers. The aqueous phase was dehydrated by rotary evaporation under reduced pressure, and the remaining ionic liquid was recycled; the organic phase was distilled under reduced pressure to recover phenol to obtain a crude product, which was recrystallized from xylene to obtain bisphenol F product with a yield of 69.58%.

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 bisphenol F by using a 1-alkyl-3-methylimidazole acidic ionic liquid. According to the invention, phenol and formaldehyde are used as raw materials, and the 1-alkyl-3-methylimidazole acidic ionic liquid is used as a solvent and a catalyst, and bisphenol F can be prepared by condensation reaction. As for the method, other organic solvents easy to volatilize are not used, the defects that the reaction time is long, recovery is difficult, the service life is short, the corrosivity is strong and the like when the bisphenol F is subjected to catalytic synthesis by common bronsted acid can be solved, and the method provided by the invention is a novel bisphenol F preparing method which is efficient and environment-friendly.

Description

technical field [0001] The invention relates to a method for preparing bisphenol F. Background technique [0002] The chemical name of bisphenol F (BPF) is dihydroxydiphenylmethane. It is an important chemical intermediate, due to its special chemical structure characteristics, when synthesizing epoxy resin, polyester resin and as phenolic resin modifier and flame retardant, the heat resistance and moisture resistance of the obtained product, insulation Performance and processing, injection molding, burning and casting are superior to similar products made of bisphenol A as raw material. Because of the many excellent properties of its finished products, it is widely used in the synthesis of high-solid coatings, electronic grade epoxy resins, special low-viscosity resins for injection molding and casting, high-performance polyester resins and polycarbon resins, and phenolic resins Modifiers and high-performance flame retardants. [0003] Catalyst is the key condition for t...

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
IPC IPC(8): C07C39/16C07C37/20
CPCY02P20/542Y02P20/54
Inventor 刘跃进刘杰王庆陈桂李勇飞田娟
Owner XIANGTAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap