Method of synthesizing alkyl methyl tetra hydronaphthalene using alkyl benzene and isopentadiene as raw material

Abstract

A process for synthesizing naphthalene alkylmethyltetrahydride from alkylbenzene and isopentandiene includes alkylation reaction between C1-C5 alkylbenzene and isopentandiene under the existance of Lewis acid or Y-type molecular sieve to obtain pentenylalkyl benzene, and cyclizing reaction under existance of Y-type molecular sieve. Its advantages are simple process and low cost.

Description

technical field [0001] The invention relates to a method for synthesizing alkylmethyl tetrahydronaphthalene from alkylbenzene and isoprene. Background technique [0002] 2,6-dialkylnaphthalene is an important fine chemical product, and its main use is as a raw material for the manufacture of high-performance engineering plastic polyethylene naphthalate (PEN). Compared with polyester materials such as polyethylene terephthalate (PET), the fibers and films produced by PEN have more excellent thermal properties, mechanical properties, optical properties, etc. Compared with PET, the heat resistance temperature of PEN is 35-55°C higher, the tensile strength is 50% higher, and the gas barrier properties (especially carbon dioxide, oxygen and water vapor) are 5 times that of PET. Therefore, PEN is especially suitable for manufacturing Packaging materials for food and beverages, tire cords, audio and video tapes and electronic components, etc. At the same time, 2,6-dialkylnaphthal...

AI Technical Summary

Problems solved by technology

The disadvantage of the synthesis of dialkyltetralins from dialkylbenzenes and butadiene is the relatively high price of the two raw materials

In the prior art, dialkyl tetrahydronaphthalene is synthesized by replacing dialkylbenzene with relatively low price monoalkylbenzene or substituting butadiene with relatively low price propylene, but a third kind of tetrahydronaphthalene must be added during synthesis. raw materials to increase the carbon source, such as adding CO, the disadvantage is that the addition of a third raw material increases the complexity of the reaction

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