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

A technology of alkyl methyl tetralin and isoprene, applied in the field of alkyl methyl tetralin, can solve the problems of high price, increase the complexity of the reaction and the like, and achieve the effect of simple process flow

Inactive Publication Date: 2005-05-25
SINOPEC SHANGHAI PETROCHEMICAL CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment 1～10

[0018] In a batch reactor with a volume of 5 liters, with stirring device and heating device, add 1.5L alkylbenzene and the catalyst of required amount, control the pressure of the reactor, and the material in the reactor is heated to the required temperature reflex. After starting the stirring, slowly add the required amount of isoprene into the reactor to carry out the alkylation reaction. The reaction start time was counted from the addition of isoprene, and the reaction was terminated after the required reaction time.

[0019] After the reaction product is discharged, the catalyst is separated (if the catalyst adopts Y-type molecular sieve, the separation of the catalyst is not carried out), then the reaction product is placed in the above-mentioned reactor, and the required amount of catalyst Y-type molecular sieve is added to carry out the ring-forming reaction, and the reaction is controlled. The pressure of the device and the heating temperature of the material. Afte...

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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...

Claims

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Application Information

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IPC IPC(8): C07C2/58C07C15/24
Inventor 曹发海房鼎业郭世卓冷志光简敏李欣欣
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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