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A kind of method for preparing 1-chloronaphthalene

A technology of chloronaphthalene and chlorine gas, which is applied in the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problems of low yield and affecting the production of 1-chloronaphthalene, and achieve the goal of improving conversion rate and saving energy Effect

Active Publication Date: 2021-03-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The yield of 1-chloronaphthalene production process is below 85%, which has affected the production of 1-chloronaphthalene for a long time because of its low yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Naphthalene 30g, kerosene 50ml, stirring, feeding chlorine, reaction temperature 55°C, catalyst 0.3g iron sulfide, reaction pressure normal pressure, reaction time 160 minutes, reaction liquid analysis, naphthalene conversion rate 100%, 1-chlorine in the reaction liquid The naphthalene content is 91.2%.

Embodiment 2

[0016] Naphthalene 30g, kerosene 60ml, stir, pass into chlorine gas, reaction temperature 50 ℃, catalyst adopts ferrous sulfide 0.3g, reaction pressure normal pressure, reaction time 135 minutes, reaction liquid analysis, naphthalene conversion rate 100%, in the reaction liquid 1- The content of chloronaphthalene is 92.5%.

Embodiment 3

[0018] Naphthalene 30g, kerosene 70ml, stirring, feeding chlorine gas, reaction temperature 65°C, catalyst 0.3g copper sulfide, reaction pressure normal pressure, reaction time 170 minutes, reaction liquid analysis, naphthalene conversion rate 100%, 1-chlorine in the reaction liquid The naphthalene content is 91.6%.

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PUM

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Abstract

The invention specifically relates to a novel preparation method for 1-chloronaphthalene, belonging to the technical field of fine chemical engineering. The preparation method comprises a step of reacting naphthalene with chlorine at 50 to 80 DEG C and at a normal pressure so as to obtain a reaction solution in the presence of a solvent and a catalyst, wherein the solvent is kerosene; the catalystis one or more selected from a group consisting of ferric sulfide, ferrous sulfide and copper sulfide; reaction temperature is 50 to 80 DEG C; and reaction time is 2 to 3 h. According to the preparation method for 1-chloronaphthalene, the conversion rate of naphthalene is 100%, the content of 1-chloronaphthalene in the reaction solution is 90% or more, and the reaction is carried out at normal temperature and normal pressure; so energy consumption is lowered, and the conversion rate is increased.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a new method for preparing 1-chloronaphthalene. Background technique [0002] 1-Chloronaphthalene is a chemical with a wide range of uses, mainly used in pharmaceutical intermediates, and can also be used as organic solvents, gas chromatography stationary liquids, analytical reagents, fungicides, antifungal agents, and wood preservatives [0003] 1-Chloronaphthalene is usually obtained by direct chlorination of naphthalene: the chlorination reaction uses zinc, iron, etc. as catalysts, the ratio of naphthalene to chlorine is 1:0.84-1.17, the amount of catalyst is 0.4-0.5% of the weight of naphthalene, and the chlorine passage time is 3- 6h, the reaction temperature is 90-95°C, the average yield of 1-chloronaphthalene is 81.7%, and the product purity is 96% after secondary fractionation. Iodine can also be used as a catalyst to react in the solvent chlorobenzene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/12C07C25/22
CPCC07C17/12C07C25/22
Inventor 赵福宝吕锋李海涛
Owner CHINA PETROLEUM & CHEM CORP