Preparation method of isopropyl naphthalene heat conducting oil and isopropyl naphthalene heat conducting oil prepared by the method

By optimizing the preparation process of isopropyl naphthalene using a molecular sieve-supported phosphotungstic acid catalyst, the problem of low catalyst activity was solved, and high conversion and high selectivity of isopropyl naphthalene heat transfer oil were achieved, making it suitable for high-temperature environments.

CN122167244APending Publication Date: 2026-06-09CHINA PETROLEUM & CHEMICAL CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2024-12-06
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The existing catalysts used in the preparation of isopropylnaphthalene have low reactivity and low selectivity for diisopropylnaphthalene, making it difficult to achieve continuous preparation of high-performance heat transfer oil.

Method used

By using a phosphotungstic acid catalyst supported on a molecular sieve and optimizing the preparation process, including mixing, stirring, drying, and calcination steps, the isopropylation reaction of naphthalene and propylene can be achieved.

Benefits of technology

The conversion rate of naphthalene and the selectivity of diisopropylnaphthalene were improved, and an isopropylnaphthalene heat transfer oil with low viscosity, low pour point and good thermal stability was prepared. It is suitable for high-temperature environments and has good application prospects.

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Patent Text Reader

Abstract

This invention discloses a method for preparing isopropylnaphthalene heat-conducting oil and the prepared isopropylnaphthalene heat-conducting oil. The method comprises the following steps: reacting raw materials containing naphthalene and propylene in the presence of a catalyst to prepare isopropylnaphthalene heat-conducting oil; the catalyst is a phosphotungstic acid catalyst supported on a molecular sieve. This invention fully utilizes the high catalytic efficiency of phosphotungstic acid and the large specific surface area and good thermal stability of molecular sieves. The catalyst obtained by supporting phosphotungstic acid on a molecular sieve exhibits high conversion rate and selectivity for diisopropylnaphthalene in the isopropylation reaction of naphthalene and propylene, without the need for complex separation operations. In the isopropylation reaction of naphthalene and propylene of this invention, the conversion rate of naphthalene can reach over 98%, and the selectivity for diisopropylnaphthalene can reach over 60%.
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