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Method for producing decahydronaphthalene and tetrahydronaphthalene by naphthalene hydrogenation

A technology of decahydronaphthalene and tetrahydronaphthalene, which is applied in the direction of hydrogenation, chemical recovery, etc., can solve the problems of complex catalyst, low yield, complicated process, etc., achieve reasonable temperature and pressure control, reduce production cost, and process simple effect

Inactive Publication Date: 2014-12-10
邯郸惠达化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technology of hydrogenation of naphthalene in the prior art is more complicated, and the yield is not high
CN102838439A discloses a method for hydrogenating naphthalene to produce decahydronaphthalene, which uses a nickel-based hydrogenation catalyst for the reaction, and the nickel-based hydrogenation catalyst used is composed of ZSM-5 molecular sieve, alkali metal, nickel oxide, molybdenum trioxide and silicon dioxide , the catalyst is complex, the cost is high, and the preparation of the catalyst requires special conditions to complete, and pre-reduction is required before use, which increases the complexity of the naphthalene hydrogenation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] In a 1000ml high-pressure reactor with a stirring device, add 500g of naphthalene and 12.5g of Raney nickel, replace the air in the kettle with nitrogen, then raise the temperature to 210 degrees, feed hydrogen, and maintain a pressure of 6Mpa to make it react, react After 5 hours, when the pressure did not drop, the reaction was finished, cooled to 35 degrees, filtered, and the filtrate was added to a 1000ml distillation flask, decompressed to -0.09Mpa and heated up for rectification, and 254g of decahydronaphthalene and 233g of tetralin were steamed out. The purity was 99.5%, 99.6%, respectively, and the yield was 97.4%.

Embodiment 2

[0015] In a 1000ml high-pressure reactor with a stirring device, add 500g of naphthalene and 25g of Raney nickel, replace the air in the kettle with nitrogen, then raise the temperature to 180 degrees, feed hydrogen, and maintain a pressure of 9Mpa to make it react, reaction 6 After one hour, when the pressure does not drop, the reaction ends, the temperature is lowered to 34 degrees, filtered, the filtrate is added in a 1000ml distillation bottle, the pressure is reduced to -0.09Mpa and the temperature is raised for rectification, and 282g of decahydronaphthalene and 197g of tetralin are steamed out. The purity was 99.1%, 99.3%, respectively, and the yield was 95.8%.

Embodiment 3

[0017] In a 1000ml high-pressure reactor with a stirring device, add 500g of naphthalene and 8.3g of Raney nickel, replace the air in the kettle with nitrogen, then raise the temperature to 240 degrees, feed hydrogen, and maintain a pressure of 2Mpa to make it react, react After 4 hours, when the pressure does not drop, the reaction ends, the temperature is lowered to 36 degrees, filtered, the filtrate is added in a 1000ml distillation flask, the pressure is reduced to -0.09Mpa and the temperature is raised for rectification, and 106g of decahydronaphthalene and 370g of tetralin are steamed out. The purity was 99.2%, 99.3%, respectively, and the yield was 95.2%.

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PUM

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Abstract

The invention discloses a method for producing decahydronaphthalene and tetrahydronaphthalene by naphthalene hydrogenation, belonging to the technical field of noncyclic or carbocyclic compounds. Under the catalytic action of Raney nickel, naphthalene is heated to react with hydrogen gas to obtain the tetrahydronaphthalene and decahydronaphthalene. The method has the advantages of simple technique, controllable and reasonable temperature and pressure, high yield and high product purity; the two products can be obtained by one hydrogenation step, so the reaction time is short; and the catalyst can be regenerated and reused, thereby greatly lowering the production cost.

Description

technical field [0001] The invention relates to the technical field of acyclic or carbocyclic compounds, especially the technical field of hydrogenation of naphthalene, in particular to a method for hydrogenating naphthalene to produce decahydronaphthalene and tetrahydronaphthalene. Background technique [0002] Decalin is mainly used as a solvent, paint remover, and lubricant for grease, resin, rubber, etc. Tetralin is a colorless liquid with an odor similar to naphthalene. It is insoluble in water and easily soluble in ethanol and ether. It is often used as a solvent, fuel for internal combustion engines, and also as a substitute for turpentine in glazing agents and paints. [0003] The process of hydrogenation of naphthalene in the prior art is complicated and the yield is not high. CN102838439A discloses a method for hydrogenating naphthalene to produce decahydronaphthalene, which uses a nickel-based hydrogenation catalyst for the reaction, and the nickel-based hydrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C13/50C07C13/48C07C5/10C07C5/11
CPCY02P20/584
Inventor 杜海林
Owner 邯郸惠达化工有限公司
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