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Process for preparing 2.6-naphthalene diisoproply by essential naphthalene critical hydrogen isopropylation

A technology of diisopropylnaphthalene and hydroisopropyl, which is applied in the field of polymer monomer preparation, can solve the problems that affect the smooth progress of the reaction, the purity and yield of the target product are unclear, and the mordenite is easy to coke and deactivate. , to achieve the effect of improving the utilization rate

Inactive Publication Date: 2008-01-30
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mordenite is easy to coke and deactivate, which affects the smooth progress of the reaction. The patent does not propose improvement measures
In addition, the purification method of 2,6-DIPN only mentions fractional crystallization without specifying the process, so the final purity and yield of the target product are unclear

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The present invention will be further stated below in combination with specific embodiments.

[0023] 1. Hydroisopropylation of Refined Naphthalene

[0024] In a 0.5L stainless steel autoclave, add 100g of coal tar refined naphthalene and 7g of activated catalyst SDHM, and use H 2 Purge and maintain the pressure at 0.4MPa. Heat the autoclave, start stirring, and when the temperature rises to 275°C, turn on the micropump and press C 3 h 6 / C 10 h 8 =1.8:1 (molar ratio) input propylene. The reaction was stopped after 7 hours, the reaction material was sucked out, the catalyst was filtered out for continuous use in the lower kettle, and the filtrate was analyzed by GC. Since the above reaction needs to carry out 7 kettles continuously, the catalyst will inevitably be lost during filtration. In order to avoid the impact of the reduction of catalyst amount on the reaction, 0.5g SDHM was added to each kettle from the second kettle to the seventh kettle, and the effect ...

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Abstract

The invention discloses a method to made 2,6-diisopropyl naphthalene by refined naphthalene hydrogen isopropylizing that could improve the purity and yield of 2,6-diisopropyl naphthalene. It includes the following steps: refined naphthalene hydrogen isopropylizing, 2,6-diisopropyl naphthalene separating and purifying, and recycle the isopropyl naphthalene. The average content of 2,6-diisopropyl naphthalene could be over 35%, and the purity could be over 99%. Other isopropyl naphthalene could be recycled to make many other kind of target production. The 2,6-diisopropyl naphthalene is the precursor of crucial organic macromolecule monomer 2,6-naphthalene dicarboxylic acid.

Description

technical field [0001] The present invention relates to the preparation method of macromolecule monomer, especially a kind of method of preparing 2,6-diisopropylnaphthalene by hydroisopropylation of refined naphthalene Background technique [0002] 2,6-Diisopropylnaphthalene (2,6-DIPN for short) is the precursor of an important organic polymer monomer 2,6-naphthalene dicarboxylic acid. The latter is used to prepare high-performance thermotropic liquid crystal polymers and a new generation of polyester polyethylene naphthalate (PEN). Compared with general-purpose polyester PET, PEN has better physical and mechanical properties, heat resistance, gas barrier properties and anti-ultraviolet radiation properties, and has been used to make ultra-thin video tape substrates, F-class insulating films, electronic components and Food and drug packaging film, etc., the application prospect is very broad. [0003] Naphthalene isopropylation is a series of reactions, and a large amount ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/66C07C15/24
Inventor 田正华赵桂利贾宏敏王沛李犇胡伟琪
Owner UNIV OF SCI & TECH LIAONING