Method for preparing 9, 9-bis(4-(2-hydroxyethoxy)phenyl)fluorene from ethylene oxide

Abstract

The invention relates to the technical field of 9, 9-bis(4-(2-hydroxyethoxy)phenyl)fluorene synthesis and especially relates to a method for preparing 9, 9-bis(4-(2-hydroxyethoxy)phenyl)fluorene from ethylene oxide. The method comprises that in the presence of a base, at a temperature of 30-80 DEG C, ethylene oxide and 9, 9-bis(4-hydroxyphenyl)fluorene undergo a reaction according to a mass ratio of 0.25: 1 to 0.35: 1 in a polar organic solvent. The preparation method adopts ethylene oxide and 9, 9-bis(4-hydroxyphenyl)fluorene as raw materials and a base as catalyst, and the reaction occurs at the normal temperature under the normal pressure so that a raw material cost is low. The preparation method does not produce waste gas and waste residues and has small pollution on the environment. The preparation method has the advantages of simple processes and low cost and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of bis-ether fluorene synthesis, in particular to a method for preparing bis-ether fluorene by catalyzing ethylene oxide. Background technique [0002] Diether fluorene, scientific name 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene, molecular formula C 29 h 26 o 4 , molecular weight 438.18, melting point 120 ℃ or 160 ℃ two melting points, white powdery substance, soluble in organic solvents such as toluene, absolute ethanol, acetone, ethyl acetate and methylene chloride. [0003] Diether fluorene is a new type of organic chemical raw material with high stability, which is mainly used to synthesize polymer monomers with excellent heat resistance, transparency and high refractive index (such as epoxy resin, polycarbonate, polyester, polyether or polyether, etc.), and these high refractive index polymers are mainly used in optical lenses, optical lenses, optical films, plastic optical fibers, optical disc subst...

AI Technical Summary

Problems solved by technology

For the metal-exchanged montmorillonite method in these technologies, the montmorillonite catalysts currently on the market are obtained by reacting with metal chlorides to produce metal exchange. First of all, because of the different sources and preparation methods of montmorillonite , so that the reaction performance is not the same, the yield of the synthesis reaction of catalyzed bis-ether fluorene is relatively low, and it is relatively difficult to purify the produced bis-ether fluorene to high purity and decolorize

Secondly, in order to improve the reaction yield, mercaptans such as β-mercaptopropionic acid are used as co-catalysts, resulting in sulfur remaining in the product, making the product susceptible to heat and turning yellow, reducing the purity and quality of the product

For the solid-supported heteropolyacid catalysis method in the prior art, the reaction liquid contains a large amount of unreacted phenoxy alcohols. Because of the high boiling point, bisether fluorene is easily soluble in it to form a thick liquid, and it is not easy to separate and purify. Reduce the chroma and purity of the product, increase the energy consumption, and increase the environmental burden, which is not conducive to industrial production

For the concentrated sulfuric acid catalyzed synthesis method of prior art, owing to use a large amount of concentrated sulfuric acid, waste water is more, cause environmental cost higher; It will reduce the chromaticity and purity of the product, and the chromaticity stability will also decrease; to improve the product purity and chromaticity, repeated purification operations are required, and a large amount of organic solvents are used for recrystallization, which increases environmental pollution and production costs

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