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Nozzle impinging stream rearrangement reactor

A technology for reactors and nozzles, which is applied in the field of reactors for the preparation of caprolactam by liquid-phase rearrangement reaction using impingement flow technology. It can solve the problems of rearrangement reactions that have not been discovered, solve the serious corrosion of equipment, and reduce the generation of side reaction products. , Improve conversion rate and selectivity effect

Active Publication Date: 2013-04-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No patent and non-patent literature reports on the use of impinging flow reactors for rearrangement reactions in the production of caprolactam

Method used

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Embodiment 1

[0018] Nozzle impingement flow rearrangement reactor of the present invention such as figure 1 , figure 2 As shown, it mainly includes a reactor 2, which is provided with an agitator 5 and a nozzle 4 arranged horizontally and symmetrically. The nozzle is installed in a tangential feeding manner, and the agitator is installed at the bottom of the reactor. An upwardly opening immersion impact chamber 3 is provided at the exit of the nozzle, and a defogging cover 2 is arranged above the immersion impact chamber. The outside of the nozzle is connected to the feed line.

[0019] In order to make full use of the turbulent kinetic energy in the multiphase fluid of the impinging flow technology, strengthen the microscopic mixing between the fluid liquid groups, and strengthen the instantaneous and rapid reaction of the reactants, such as figure 2 As shown, two layers of feed assemblies 6 are arranged in the reactor, and each layer is two pairs of feed assemblies. The two layers of...

Embodiment 2

[0022] Lab implementation. Using the coupling competition series secondary reaction system of α-naphthol (A) and p-aminobenzenesulfonic acid diazonium salt (B, referred to as diazonium salt), the nozzle impingement flow rearrangement reactor of the present invention and the traditional stirred tank reactor Microscopic mixing time is measured, the principle is to determine the reaction time constant through the selectivity of slow reaction products to define the microscopic mixing characteristic time constant .

[0023] The experimental equipment of the present invention and the stirred tank reactor are all made of transparent plexiglass, with an inner diameter of 320 mm, which is about 1 / 10 of the diameter of the actual rearrangement reactor. Among them, four baffles are arranged on the inner wall of the stirred tank reactor, and the width of each baffle is 1 / 10 of the tank diameter, and the stirring paddle is a standard six-bladed Rushton turbine paddle.

[0024] while m...

Embodiment 3

[0027] Industrial Implementation in Caprolactam Rearrangement Process. The operation process is as follows: Dissolve cyclohexanone oxime in n-hexane, then mix the amidation reaction solution and cyclohexanone oxime solution according to the required mass ratio (preferably 0.46:1) and introduce them into the rearrangement reactor for rearrangement reaction. Among them, the preferred flow rate of the amidation reaction solution entering the rearrangement reactor is about 23 t / h, and the feed temperature is preferably 71°C; the preferred flow rate of the cyclohexanone oxime solution is about 50 t / h, and the feed temperature is preferably 61°C. ℃. The pressure of the rearrangement reactor is controlled at slightly positive pressure, the pressure is controlled at about 5 kPa, and the rotational speed of the stirrer is controlled at 80-180 rpm.

[0028] When the traditional rearrangement reactor is used for rearrangement reaction, when the production capacity is 70 kt / a, the conve...

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Abstract

The present invention relates to a nozzle impinging stream rearrangement reactor, which mainly comprises a reaction kettle, wherein a stirring device and nozzles are arranged inside the reaction kettle, the nozzles are arranged horizontally and symmetrically, and are installed in a tangent line material feeding manner, the outlet position of the nozzle is provided with an immersion impinging chamber with an upward opening, a defogging cover is arranged above the immersion impinging chamber, and 1-5 layers of material feeding assemblies are arranged inside the reaction kettle, wherein each layer comprises 1-5 pairs of the material feeding assemblies, and every layer of the material feeding assemblies are axially arranged in a parallel manner. According to the present invention, turbulent flow kinetic energy in a multiphase fluid is adopted to strengthen micro mixing between fluid masses, increase conversion rate and selectivity of a caprolactam rearrangement reaction, and reduce reaction byproduct eight formation. The nozzle impinging stream rearrangement reactor is used for rearrangement processes of caprolactam production and chemical engineering production processes of multiphase liquid rapid reactions.

Description

technical field [0001] The invention relates to a device for preparing caprolactam, in particular to a reactor for preparing caprolactam by liquid-phase rearrangement reaction using impinging flow technology. Background technique [0002] Production of caprolactam by benzene method with oleum or free SO 3 The feed liquid is a catalyst, and the intermediate product cyclohexanone oxime is rearranged and converted into caprolactam. The rearrangement reaction is a rapid liquid-liquid reaction in milliseconds. The microscopic mixing of the reaction liquid is extremely important for the rearrangement reaction. The effect of microscopic mixing directly affects the conversion rate and selectivity of the rearrangement reaction. The effect of micro-mixing is determined by the mixing method and mixing equipment. [0003] The existing rearrangement reactor is composed of a nozzle reactor, an agitator, a static mixer and a conduit, and the agitation effect of the agitator is used to en...

Claims

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Application Information

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IPC IPC(8): B01J19/26C07D223/10C07D201/06
Inventor 毛在砂潘九海杨超王文生汪洋王仲霞程景才范平
Owner CHINA PETROLEUM & CHEM CORP
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