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A kind of method and equipment for producing adipic acid by oxidizing alcohol and ketone with nitric acid

A technology for oxidizing alcohols and ketones and oxidizing acids, which is applied in the field of nitric acid oxidation of alcohols and ketones to adipic acid, which can solve the problems of cumbersome equipment and low conversion rate, and achieve the effects of suppressing side reactions, stable reaction, and wide reaction temperature range

Active Publication Date: 2016-09-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method and equipment for producing adipic acid by oxidizing alcohol and ketone with nitric acid, so as to solve the problems of cumbersome equipment and low conversion rate in the prior art

Method used

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  • A kind of method and equipment for producing adipic acid by oxidizing alcohol and ketone with nitric acid
  • A kind of method and equipment for producing adipic acid by oxidizing alcohol and ketone with nitric acid
  • A kind of method and equipment for producing adipic acid by oxidizing alcohol and ketone with nitric acid

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Experimental program
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Effect test

Embodiment 1-4

[0022] The equipment used for the preparation of adipic acid by nitric acid oxidation of alcohol and ketone comprises alcohol and ketone storage tank 1, oxidation acid storage tank 2, buffer tank 3, absorption tank 4, reaction kettle 5, oxidation acid feed pump 6, alcohol and ketone feed pump 7. Vacuum pump 8, condenser 9;

[0023] The outlet of the oxidizing acid storage tank 2 is connected to the reaction kettle equipped with an agitator through a pipeline, or connected to the inlet of the oxidizing acid feed pump 6 through a pipeline, and the outlet of the alcohol and ketone storage tank 1 is connected through a pipeline Connect with the feed inlet of alcohol and ketone feed pump 7, the outlet of oxidation acid feed pump, the outlet of alcohol and ketone feed pump are connected with reactor 5 through pipeline; Reactor is connected with condenser 9 through pipeline, The condenser is connected with the buffer tank 3 through the pipeline, the buffer tank is connected with the ...

Embodiment 5-8

[0032]Under the condition of reaction temperature 65~105℃, stirring speed 300rpm, negative pressure -0.020~-0.005Mpa (gauge pressure), the oxidizing acid reacts with alcohol and ketone, the oxidizing acid is excessive, and the oxidizing acid in the oxidizing acid storage tank passes through The feed pump is continuously added to the reaction kettle at a certain speed, and the alcohol and ketone in the alcohol and ketone storage tank are continuously added to the reaction kettle at a certain speed through the alcohol and ketone feed pump under the conditions of heating, stirring and negative pressure, so that the oxidation acid and alcohol and ketone Reaction, oxidation acid excess, oxidation reaction continues. The gas generated by the reaction enters the buffer tank after being condensed by the condenser, and the non-condensable gas enters the absorption tank after passing through the buffer tank. After being absorbed by water, the non-water-soluble gas is discharged through t...

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Abstract

The invention relates to a method and device for preparation of adipic acid through alcohol ketone oxidation by nitric acid. Oxidizing acid in an oxidizing acid storage tank automatically flows into a reaction kettle through liquid level difference, or is added into the reaction kettle continuously through an oxidizing acid feed pump, under the conditions of a reaction temperature of 60-110DEG C, a stirring speed of 100-600rpm, and a gauge pressure of minus 0.030-0Mpa, the alcohol ketone in an alcohol ketone storage tank is added into the reaction kettle continuously through an alcohol ketone feed pump so as to make the oxidizing acid react with the alcohol ketone, the oxidizing acid is excessive, the oxidation reaction proceeds intermittently or continuously, the reaction generated gas is condensed by a condenser and then enters a buffer tank, non-condensable gas passes through the buffer tank and then enters an absorption tank, after water absorption, non-water soluble gas is discharged by a vacuum pump, and by means of subsequent treatment, the adipic acid product with purity greater than 99.5% can be obtained. According to the invention, the process flow is simplified, the device is simple, the operation is easy, the harm caused by water soluble corrosive exhaust gas to human body and the environment is eliminated, and the discharge of harmful gas to the outside can be reduced.

Description

technical field [0001] The invention relates to a method and equipment for preparing adipic acid by oxidizing alcohol and ketone with nitric acid. Background technique [0002] The largest consumption field of adipic acid in my country is the polyurethane industry, which is mainly concentrated in the stock solution and slurry of shoe soles to form polyurethane for shoes and polyurethane for leather. A small amount of adipic acid can also be used in plasticizers, plastic additives, food additives, etc. . [0003] There are three main routes for industrial production of adipic acid: cyclohexane method, cyclohexanol method and butadiene carbonylation method. Among them, the air oxidation of cyclohexane to produce adipic acid through cyclohexanone and cyclohexanol is the main route. At present, this route accounts for about 93% of the total global production capacity. At present, the most commonly used cyclohexane route in the industry is the catalytic hydrogenation of pure ben...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C55/14C07C51/27
CPCC07C51/27C07C55/14
Inventor 石鸣彦程光剑张元礼刘家伟李民曹微翟国栋黄集钺徐天祝李多春李志宇韩秋萍
Owner PETROCHINA CO LTD