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Method for preparing 2, 6-diisopropylnaphthalene through naphthalene shape-selective alkylation

A technology of diisopropylnaphthalene and alkylation, applied in chemical instruments and methods, organic chemistry, chemical recovery and other directions, can solve the problems of low conversion rate and selectivity of 2,6-DIPN, and achieve convenient operation and low cost. Inexpensive and simple to operate

Active Publication Date: 2022-06-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, the conversion and selectivity of 2,6-DIPN from naphthalene are still low

Method used

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  • Method for preparing 2, 6-diisopropylnaphthalene through naphthalene shape-selective alkylation
  • Method for preparing 2, 6-diisopropylnaphthalene through naphthalene shape-selective alkylation
  • Method for preparing 2, 6-diisopropylnaphthalene through naphthalene shape-selective alkylation

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0041] Preparation Example 1 Catalyst Preparation

[0042] Take 10 g of MOR molecular sieve (Si / Al=19) and place it in a tube furnace, heat up to 500°C under nitrogen protection, stop feeding nitrogen, inject 25% ammonia water, and feed 50 g / h, and after 60 min of treatment, The feed was switched to nitrogen purging for 30 min to cool down. The resulting catalyst was named MOR(19)-500-60.

preparation example 2～8

[0043] Preparation Examples 2-8 Catalyst Preparation

[0044] The operation steps are the same as those of Preparation Example 1, the types of molecular sieves, and the treatment temperature and time are shown in Table 1.

[0045] Table 1 Preparation conditions table of catalysts

[0046]

[0047] Note: *Si / (Si+Al+P)=0.20 in SAPO-5

[0048] Evaluation of the reaction performance of the catalysts of Examples 1-18

[0049] A 500mL reaction kettle was used for evaluation. 10 g of the catalyst was loaded into a tube furnace, activated under the protection of inert gas nitrogen at 500° C. for 240 min, and then lowered to room temperature. The catalyst was taken out and put into the reaction kettle, 200 g of industrial naphthalene and 7.91 mg of 1,3,5-trimethylpyridine were added, and the mixture was stirred evenly, replaced with inert gas nitrogen three times, and the reaction kettle was sealed. 131 g of propylene was injected using a high pressure pump. The temperature was...

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Abstract

The invention discloses a method for preparing 2, 6-diisopropylnaphthalene through shape-selective alkylation of naphthalene. The method comprises the following steps: mixing a mixed material containing a naphthalene source and an organic amine compound with an alkylation reagent and a catalyst to obtain a mixed system, and reacting to obtain a product containing 2, 6-diisopropylnaphthalene. The conversion per pass of naphthalene and 2-isopropyl naphthalene reaches 85% or above, the selectivity of 2, 6-diisopropyl naphthalene in a disubstituted product is higher than 75%, and the ratio of 2, 6 / 2, 7-diisopropyl naphthalene is larger than 3. The method is simple and easy to operate and suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of diisopropylnaphthalene, in particular to a preparation method of 2,6-diisopropylnaphthalene, and belongs to the field of chemical industry. Background technique [0002] 2,6-Dialkylnaphthalene is a key raw material for the production of high-performance polyester fibers and plastics. Polyethylene naphthalate (PEN) is obtained by the polymerization of its oxidation product, 2,6-naphthalenedicarboxylic acid and ethylene glycol. It is a new type of polyester material with great potential and application prospects. PEN has unique heat resistance, mechanical properties, gas barrier properties, chemical stability and radiation resistance, etc., and can be widely used in electronic components, instrumentation, insulating materials, food packaging films, beer bottles, aerospace and other manufacturing industries . At present, the bottleneck of large-scale application of PEN lies in the complicated preparation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/58C07C2/66B01J29/18B01J29/70B01J29/85
CPCC07C2/66B01J29/18B01J29/7007B01J29/70B01J29/85B01J2229/36B01J2229/38C07C15/58Y02P20/584
Inventor 袁扬扬许磊赵晓炜张毅张晓敏王弋戈
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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