Reaction temperature stability maintaining system of system for producing adipic acid by nitric acid oxidation method

A nitric acid oxidation method and reaction temperature technology, applied in chemical/physical/physical chemical fixed reactors, chemical instruments and methods, preparation of organic compounds, etc., can solve problems such as temperature unevenness, achieve improved cooling effect, good economy Benefits, the effect of achieving stable control

Inactive Publication Date: 2020-07-10
HENAN SHENMA NYLON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the problem of heat of reaction in the production of adipic acid by nitric acid oxidation in the prior art, the present invention provides a reaction temperature maintenance system for the production of adipic acid by nitric acid oxidation. The cooling liquid is supplied separately to the lower coil and the lower coil, and according to the difference in the reaction heat caused by the position difference or the change of the reaction time of the outer coil, the inner coil and the lower coil, the flow rate of the respective cooling liquid is adjusted in a targeted manner, which can be obtained from Fundamentally solve the problem of uneven temperature in the reactor, and can precisely control the temperature in the reactor without being affected by the position or the reaction period, but can be maintained within a constant temperature range

Method used

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  • Reaction temperature stability maintaining system of system for producing adipic acid by nitric acid oxidation method
  • Reaction temperature stability maintaining system of system for producing adipic acid by nitric acid oxidation method

Examples

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Effect test

Embodiment 1

[0026] Such as figure 1 As shown, a reaction temperature maintenance system for producing adipic acid system by nitric acid oxidation method includes a reactor 2, the reactor 2 adopts the adipic acid reactor in the prior art, and the reactor 2 is provided with a gas phase port 9. The stirring paddle 10 and the second feeding pipe 11, the middle part of the reaction kettle 2 is provided with a first feeding pipe 22 and a discharge pipe 4, the outlet of the first feeding pipe 22 and the inlet of the discharge pipe 4 are provided with a baffle 54, And same as the prior art, the inner coil pipe 5 and the outer coil pipe 3 which are all spirally extending along the axial direction of the reactor are provided in the reactor 2 from the inside to the outside, and the bottom of the reactor is provided with There is a lower coil 1, cooling water circulates in the inner coil 5, outer coil 3 and lower coil 1, and the outlets of the inner coil 5, outer coil 3 and lower coil 1 are respectiv...

Embodiment 2

[0037] Such as figure 2 As shown, a reaction temperature maintenance system for producing adipic acid system by nitric acid oxidation method includes a reactor 2, the reactor 2 adopts the adipic acid reactor in the prior art, and the reactor 2 is provided with a gas phase port 9. The stirring paddle 10 and the second feeding pipe 11, the middle part of the reaction kettle 2 is provided with a first feeding pipe 22 and a discharge pipe 4, the outlet of the first feeding pipe 22 and the inlet of the discharge pipe 4 are provided with a baffle 54, And same as the prior art, the inner coil pipe 5 and the outer coil pipe 3 which are all spirally extending along the axial direction of the reactor are provided in the reactor 2 from the inside to the outside, and the bottom of the reactor is provided with There is a lower coil 1, cooling water circulates in the inner coil 5, outer coil 3 and lower coil 1, and the outlets of the inner coil 5, outer coil 3 and lower coil 1 are respecti...

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Abstract

The invention is based on the reaction heat problem of adipic acid production by a nitric acid oxidation method in the prior art. The invention provides a reaction temperature stability maintaining system of a system for producing adipic acid by a nitric acid oxidation method. Cooling liquids are supplied to an inner coil, an outer coil, an inner coil and a lower coil of an adipic acid reactor respectively; according to reaction heat difference caused by the position difference or the reaction time period change of the outer coil pipe, the inner coil pipe and the lower coil pipe, flows of therespective cooling liquids are regulated and controlled in a targeted manner, so that the problem of uneven temperature in the reactor can be fundamentally solved, and the temperature in the reactor can be accurately controlled not to be influenced by the position or the reaction time period and can be maintained in a constant-temperature interval.

Description

technical field [0001] The invention belongs to the technical field of adipic acid production, and in particular relates to a reaction temperature stabilization system for producing adipic acid by nitric acid oxidation. Background technique [0002] Adipic acid is a dibasic acid, which is usually condensed with diamines or diols to form high molecular polymers through esterification or amidation reactions. It is a dibasic carboxylic acid commonly used in industrial production, such as nylon-66 Production. In the current production practice of adipic acid, nitric acid oxidation method is widely used to produce adipic acid, specifically: the reaction raw material KA oil or cyclohexanol is put into the reactor, under the action of copper and vanadium catalyst, nitric acid is used as The oxidizing agent oxidizes to form adipic acid. For this method, at the initial stage of the reaction, the reaction system needs to be heated to promote the occurrence of oxidation reaction, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/18C07C51/27C07C55/14
CPCB01J19/18B01J2219/00081C07C51/27C07C55/14
Inventor 赵铎巩国顺史红军陈聚良张昌会华东旭代世磊孙浩杰刘镇江李东伟马晓鹏赵振忠张军明连书耀张敏朱宏志吕自豪孙涛涛李涛王永雷
Owner HENAN SHENMA NYLON CHEM
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