Multistage horizontal stirred airlift reactor for preparing ethylbenzene hydroperoxide and its application

A technology of ethylbenzene hydroperoxide and reactor, which is applied in chemical/physical/physicochemical stationary reactors, preparation of peroxygen compounds, chemical instruments and methods, etc., to achieve safe and reliable operation, improve flexibility, and improve gas The effect of distribution uniformity

Active Publication Date: 2021-04-20
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a multi-stage horizontal stirred airlift reactor for preparing ethylbenzene hydroperoxide, to overcome the problems existing in the existing horizontal reactor, improve the operational flexibility of the reactor, and improve the handling capacity of the production equipment. Ability to change market conditions

Method used

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  • Multistage horizontal stirred airlift reactor for preparing ethylbenzene hydroperoxide and its application
  • Multistage horizontal stirred airlift reactor for preparing ethylbenzene hydroperoxide and its application
  • Multistage horizontal stirred airlift reactor for preparing ethylbenzene hydroperoxide and its application

Examples

Experimental program
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Embodiment 1

[0041] use as figure 1 The reactor shown. The reactor 1 has a diameter of about 1.5 meters and a length of about 6 meters. The reactor was divided into four reaction compartments 20 by using three partitions 14, and a liquid flow channel with a diameter of 100 mm was left at the bottom of the partitions 14. The middle part of each compartment is provided with a guide tube 12 perpendicular to the direction of liquid flow, the diameter of the guide tube 12 is 40% of the diameter of the reactor 1, the height of the guide tube 12 is 50% of the diameter of the reactor 1, and the bottom of the guide tube 12 The distance to the reactor wall is 10% of the reactor 1 diameter. A stirring device 6 is arranged in the center of the guide tube 12, and the stirring device 6 includes two layers of stirring paddles 9, the lower layer is a six-concave-blade disc turbine, and the upper layer is a six-pitched-blade stirring paddle. A first gas distributor 10 and a second gas distributor 13 are...

Embodiment 2

[0045] The difference from Example 1 is that the diameter of the guide tube 12 is 60% of the diameter of the reactor 1, and the height of the guide tube 12 is 60% of the diameter of the reactor 1; the central stirring device of the guide tube 12 is changed to a single-layer six inclined blade mixer.

[0046] A first gas distributor 10 and a second gas distributor 13 are respectively provided outside and inside the guide tube 12, wherein the second gas distributor 13 adopts a ring-shaped gas distribution device, which is substantially flat with the lower end of the guide tube 12. Arranged uniformly, on which about 28 air distribution holes are arranged according to the gas flow of each compartment; similar figure 2 The gas distribution device shown includes two gas distribution main pipes 18, but the number of gas distribution branch pipes 19 is reduced from six to four, and about 22 gas distribution holes are arranged on it according to the gas flow rate of each compartment. ...

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Abstract

The invention discloses a multistage horizontal stirred air-lift reactor and its application in the preparation of ethylbenzene hydroperoxide. The liquid phase outlet at the opposite end, and a plurality of baffles arranged in the reactor at intervals along the longitudinal direction, a liquid phase channel is arranged between adjacent reaction compartments; the top of each reaction compartment is provided with an exhaust port, The middle part is provided with a guide tube and a stirring device; the upper and lower parts of the guide tube are connected, and the stirring parts of the stirring device are arranged in the guide tube; the first and second gas distribution chambers are also provided in the reaction compartment. The first gas distributor is arranged outside the guide cylinder, and the second gas distributor is arranged inside the guide cylinder. The reactor effectively improves the uniformity of gas distribution in the reactor, makes the operation of the reactor safer and more reliable when the gas flow rate is small, and improves the flexibility of the device to adapt to market changes.

Description

technical field [0001] The invention relates to a reactor for preparing organic peroxide, in particular to a multistage horizontal stirring airlift reactor for preparing ethylbenzene hydroperoxide and application thereof. 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] The preparation of ethylbenzene hydroperoxide by oxidation of ethylbenzene is the key of PO / SM method. Since ethylbenzene is oxidized to EBHP, EBHP will further undergo series side reactions, resulting in a decrease in the selectivity of EBHP. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/18C07C407/00C07C409/08
CPCB01J19/0053B01J19/18C07C407/00C07C409/08
Inventor 刘鹏丛振霞李广琼张鹏举陈琳陈晨于天勇
Owner WANHUA CHEM GRP CO LTD
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