Preparation method of o-aminoanisole

A technology for o-anisole and o-nitroanisole, which is applied in the field of preparation of o-anisole, can solve the problems of huge waste of resources, serious environmental pollution, low preparation efficiency and the like, and achieves reduction of steam energy consumption, The effect of increased productivity

Inactive Publication Date: 2014-04-09
于宝江
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  • Summary
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Problems solved by technology

These methods have a series of defects such as low preparation effic

Method used

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Effect test

Embodiment 1

[0011] Add 4000 liters of o-nitroanisole into the reduction reactor with a feed pump, close all valves of the reduction reactor, replace the oxygen in the reactor with nitrogen, and after the replacement, start the agitator of the reduction reactor, add After the catalyst is 15kg, the temperature is raised to 60 degrees and 600 cubic meters of hydrogen gas is introduced, and the temperature is raised by the heat of reaction, and the temperature is kept at 130 degrees by cooling with a jacket and a coil; 3 hours; after the reaction is completed, the temperature in the kettle is reduced to 40 degrees, the stirring is stopped to settle the catalyst, the catalyst is filtered off, the anthranil is sent to the stratifier, the layers are static, and then rectification is obtained to obtain the refined anthranil .

[0012] The catalyst is palladium carbon and nickel alloy, and the weight ratio of the palladium carbon and nickel alloy is 1:1. The steam energy consumption can be reduce...

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PUM

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Abstract

The invention discloses a preparation method of o-aminoanisole. The preparation method comprises the following steps: adding 4000L of o-nitroanisole into a reduction reaction kettle by using a feeding pump; closing all valves of a reduction reactor; entirely replacing oxygen in the reaction kettle by nitrogen; turning on a stirring device of the reduction reactor after replacing; adding 15kg of a catalyst, heating to 60 DEG C and introducing 600m<3> of hydrogen; heating through reaction heat; keeping the temperature at 130 DEG C by using a jacket and a coiler to cool; controlling a reaction temperature at 60-150 DEG C and a reaction pressure within a range of 0.8-3.0MPa in a reaction process; reducing a temperature inside the kettle to 40 DEG C after the reaction; stopping stirring to settle the catalyst; filtering out the catalyst; sending o-aminoanisole to a layering device; standing for layering; and finally, rectifying to obtain refined o-aminoanisole. The preparation method disclosed by the invention has no need of distillation; the energy consumption of steam is reduced by more than 80%; the yield can be doubled.

Description

technical field [0001] The invention relates to a method for preparing anthranil, in particular to a method for preparing anthranil without using a solvent. Background technique [0002] Anisole, also known as o-anisidine; o-methoxyaniline, 2-methoxyaniline or 2-aminoanisole; can be used to prepare azo dyes; ice dyes and naphthol AS-OL and other dyes As well as medicines such as guaiacol and analgesia, vanillin can also be prepared. [0003] At present, the methods for preparing anthranil are mainly hydrogenation reduction method, alkali sulfide reduction method and electrochemical synthesis method. These methods have a series of defects such as low preparation efficiency, serious environmental pollution, and huge waste of resources. Contents of the invention [0004] The purpose of the present invention is to solve the above-mentioned deficiencies in the prior art and provide a method for preparing anthranil without using a solvent. The method does not use distillation,...

Claims

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Application Information

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IPC IPC(8): C07C217/84C07C213/02
Inventor 于宝江
Owner 于宝江
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