A device and method for oxidation of organic matter

A technology of ethylbenzene hydroperoxide and bubbling reactor, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problem of decreased production capacity of equipment, insufficient contact between gas and liquid, and return of liquid phase. mixed problems

Active Publication Date: 2021-07-23
WANHUA CHEM GRP CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] Although the above-mentioned reactor is widely used in the peroxidation reaction of organic matter, there is still the problem of insufficient contact between gas and liquid.
Shell has publicly reported (Chemical Engineering Science, 62(2007) 5495-5502) that there is a lack of oxygen in some areas of this type of reactor, resulting in a decline in equipment production capacity
[0007] In addition, the oxidation process of organic matter generally follows the mechanism of free radicals, and a certain initiation time is required in the initial stage of the reaction.
During the normal operation of the horizontal reactor, most of the fluid flows in the horizontal direction, and the liquid phase back-mixing is low. Although this feature is conducive to improving the reaction selectivity, it also leads to a low reaction rate in the initial stage of the reaction and a long initiation time. reduce equipment capacity

Method used

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  • A device and method for oxidation of organic matter
  • A device and method for oxidation of organic matter
  • A device and method for oxidation of organic matter

Examples

Experimental program
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Effect test

Embodiment 1

[0061] use as figure 1 In the shown device, the diameter of the vertical bubbling reactor 1 is about 0.8 meters, and the total height is about 3 meters. The diameter of the guide tube 4 is 0.3 meters, and the height is 1.2 meters. Arranged between the guide tube and the inner wall of the reactor, the opening diameter is 2mm, and the opening ratio is 0.02%. The horizontal bubble reactor 11 has a diameter of about 1.6 meters and a length of about 3.66 meters. The reactor was divided into four reaction compartments 21 by using three partitions 14, and a liquid flow channel 22 with a diameter of 110 mm was left at the bottom of the partitions 14. Each compartment 21 contains 4 gas distribution porous tubes, the gas distribution porous tubes are evenly and symmetrically distributed along the arc of the lower part of the reactor, the opening diameter is 2mm, and the opening ratio is 0.05%. Such as figure 2 As shown, two symmetrical vertical baffles are arranged on the inside of t...

Embodiment 2

[0065] Change the diameter of the guide tube 4 in Example 1 to 0.5 meters, and the height of the guide tube to 1.0 meters, change the opening ratio of the gas distributor in the horizontal bubbling reactor to 10%, repeat the experiment in Example 1, and control the vertical The temperature of the horizontal bubble reactor is 138°C, the reaction temperature of the second compartment of the horizontal bubble reactor is 136°C, the reaction temperature of the third compartment is 135°C, the reaction temperature of the fourth compartment is 134°C, and the gas phase pressure of the reactor is about 3.5barG .

[0066] Adopt above-mentioned conditions to carry out experiment, the reaction liquid mixture that the outlet of reactor liquid phase can obtain ethylbenzene hydroperoxide content is about 7.3wt%, and vertical bubbling reactor outlet ethylbenzene hydroperoxide concentration is 1.33%, ethylbenzene Hydroperoxide selectivity is about 88.4%.

Embodiment 3

[0076] Using the same reactor structure as in Example 1, in this example the liquid phase flowing out from the vertical reactor directly enters the first compartment of the horizontal reactor, and then flows through the second, third and fourth compartments in sequence. In this example, the total residence time remains the same as Example 1 by adjusting the reactor liquid level. Other reaction conditions are all identical with embodiment 1, repeat the experiment of embodiment 1.

[0077] Under above-mentioned conditions, can obtain the reaction liquid mixture that ethylbenzene hydroperoxide content is about 7.2wt% at reactor liquid phase outlet, and vertical bubble reactor outlet ethylbenzene hydroperoxide concentration is about 1.21%, ethylbenzene The overall selectivity to hydroperoxides is about 88.7%.

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Abstract

The invention discloses a device and a method for organic oxidation, in particular a method for preparing ethylbenzene hydroperoxide by reacting ethylbenzene with an oxygen-containing gas. The device comprises a vertical bubbling reactor and a The horizontal bubbling reactor of the reaction product outlet of the vertical bubbling reactor, the horizontal bubbling reactor is provided with multi-stage reaction compartments arranged along its axial direction, and the adjacent reaction compartments are provided with liquid channel. Through the clever combination of the reactors, the method enables the oxidation reaction of organic matter to be carried out under more favorable conditions, thereby improving the production capacity of the equipment.

Description

technical field [0001] The invention relates to a method for oxidizing organic matter such as ethylbenzene or cumene or cyclohexane, in particular to a method for preparing ethylbenzene hydroperoxide by contacting and reacting ethylbenzene with oxygen-containing gas. Background technique [0002] Propylene oxide (PO) and styrene (SM) co-production method (PO / SM method) is currently one of the best processes for producing propylene oxide. The PO / SM method mainly includes three steps: ①Ethylbenzene is contacted with air to oxidize ethylbenzene hydroperoxide (EBHP); ②EBHP oxidizes propylene to propylene oxide, and itself is reduced to phenylmethyl alcohol; ③Benzene Dehydration of methyl alcohol to styrene. Its reaction route available formula (1) expression: [0003] [0004] Among them, the oxidation of ethylbenzene to prepare ethylbenzene hydroperoxide is the key of PO / SM method. Since ethylbenzene is oxidized to EBHP, EBHP will further undergo series side reactions, re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/24B01J19/00C07C407/00C07C409/08
CPCB01J19/245B01J19/0053C07C407/00C07C409/08B01J4/004B01J19/006B01J2219/00768B01J2219/0004B01J2219/182B01J2219/185B01J2208/00557B01J2208/0061B01J10/002
Inventor 刘鹏孙犀璨朱发明丛振霞乔小飞
Owner WANHUA CHEM GRP CO LTD
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