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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  • Abstract
  • Description
  • Claims
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No patent and non-patent literature reports on the use of impinging flo

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  • Nozzle impinging stream rearrangement reactor
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  • Nozzle impinging stream rearrangement reactor

Examples

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Example Embodiment

[0017] Example 1

[0018] The nozzle impinging stream rearrangement reactor of the present invention is such as figure 1 , figure 2 As shown, it mainly includes a reactor 2 in which a stirrer 5 and a nozzle 4 arranged horizontally and symmetrically are arranged. The nozzles are installed in a tangential feeding manner, and the stirrer is installed at the bottom of the reactor. An upwardly opening immersion impact chamber 3 is provided at the nozzle outlet, and a demister 2 is provided above the immersion impact chamber. The outside of the nozzle is connected with the feed pipe.

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

Example Embodiment

[0021] Example 2

[0022] Laboratory implementation. Using α-naphthol (A) and diazonium p-sulfanilic acid diazonium salt (B, referred to as diazonium salt) in a coupled competition series two-stage reaction system, the nozzle impinging stream rearrangement reactor of the present invention and the traditional stirred tank reactor Micro-mixing time is measured, the principle is to selectively determine the reaction time constant through slow reaction products Time constant .

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

[0024] While maintaining the initial molar ratio , PH=10, appar...

Example Embodiment

[0026] Example 3

[0027] Industrial implementation of caprolactam rearrangement process. The operation process is as follows: dissolve cyclohexanone oxime in n-hexane, and then mix the amidation reaction solution and cyclohexanone oxime solution into the rearrangement reactor according to the required mass ratio (preferably 0.46:1). Rearrangement reaction. Among them, the preferred flow rate of the amidation reaction liquid 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 ℃. The pressure of the rearrangement reactor is controlled at slightly positive pressure, the pressure is controlled at about 5 kPa, and the 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 conversion rate of cyclo...

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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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