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Method for preparing ethylbenzene hydroperoxide through ethylbenzene reactive distillation and reactive distillation tower thereof

A technology of ethylbenzene hydroperoxide and rectification tower, which is applied in the preparation of peroxy compounds, chemical instruments and methods, separation methods, etc. The temperature control of the reactor is complex and other problems, so as to meet the reaction contact time, simplify the follow-up treatment, and improve the conversion rate and selectivity.

Active Publication Date: 2021-01-05
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of this type of reactor are: in the horizontally placed cylinder, the interface along the radial direction changes greatly, and complex partition internals, gas distributors and heat exchange equipment need to be arranged, and the reactor volume cannot be effectively used. In addition, , the volume of the reactor is too large, and the horizontal placement occupies a large area
Wanhua Chemical discloses a vertical multi-stage bubble column oxidation reactor in patent CN201510624458.9, which improves the total conversion rate and total selectivity of the reaction through step-by-step cooling operation, but the temperature control of each stage reactor is relatively complicated

Method used

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  • Method for preparing ethylbenzene hydroperoxide through ethylbenzene reactive distillation and reactive distillation tower thereof
  • Method for preparing ethylbenzene hydroperoxide through ethylbenzene reactive distillation and reactive distillation tower thereof
  • Method for preparing ethylbenzene hydroperoxide through ethylbenzene reactive distillation and reactive distillation tower thereof

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Effect test

Embodiment 1

[0051] The method and device thereof for preparing ethylbenzene hydroperoxide by catalytic reaction rectification of the present embodiment are as described above, and the specific operating parameters are:

[0052] Catalytic reaction rectification tower, tower diameter 1.8m, 3m packing in rectification section, 3m packing in stripping section, 40 layers of catalytic reaction rectification trays in catalytic reaction section, the number of hoods on the trays in catalytic reaction section is 20, The total area of ​​each catalyst package is 1.05m 2 , with a volume of 0.12m 3 , The quality of each layer of catalyst is 250kg.

[0053] The operating conditions are: tower top pressure 0.2MPaG, tower top temperature 42°C, tower bottom temperature 83°C, reflux ratio 6, space velocity 4h -1 .

[0054] After normal operation, the conversion rate of ethylbenzene is 10.52%, and the selectivity of EBHP is 91.5%.

Embodiment 2

[0060] The method and device thereof for preparing ethylbenzene hydroperoxide by catalytic reaction rectification of the present embodiment are as described above, and the specific operating parameters are:

[0061] Catalytic reaction rectification tower, tower diameter 1.8m, 3m packing in rectification section, 3m packing in stripping section, 40 layers of catalytic reaction rectification trays in catalytic reaction section, the number of hoods on the trays in catalytic reaction section is 24, The total area of ​​each catalyst package is 1.20m 2 , with a volume of 0.15m 3 , The quality of each layer of catalyst is 300kg.

[0062] The operating conditions are: tower top pressure 0.4MPaG, tower top temperature 61°C, tower bottom temperature 98°C, reflux ratio 4, space velocity 5h -1 .

[0063] After normal operation, the conversion rate of ethylbenzene is 10.63%, and the selectivity of EBHP is 92.8%.

Embodiment 3

[0065] The method and device thereof for preparing ethylbenzene hydroperoxide by catalytic reaction rectification of the present embodiment are as described above, and the specific operating parameters are:

[0066] Catalytic reaction rectification tower, tower diameter 1.8m, rectification section 3m packing, stripping section 3m packing, catalytic reaction section 40 catalytic reaction rectification trays, the number of hoods on the catalytic reaction section tray is 22, The total area of ​​each catalyst package is 1.12m 2 , with a volume of 0.14m 3 , The quality of each layer of catalyst is 275kg.

[0067] The operating conditions are: tower top pressure 0.8MPaG, tower top temperature 80°C, tower bottom temperature 123°C, reflux ratio 8, space velocity 5h -1 .

[0068] After normal operation, the conversion rate of ethylbenzene is 10.56%, and the selectivity of EBHP is 94.3%.

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Abstract

The invention discloses a method for preparing ethylbenzene hydroperoxide through ethylbenzene reactive distillation and a reactive distillation tower thereof. A catalyst bag is fixed between gas raising covers of a tower plate, and the catalyst bag further comprises a strip-shaped catalyst. The method is high in efficiency, raw materials pass through the catalyst and the tower plate separation and purification element repeatedly, and the conversion rate and selectivity are improved. Meanwhile, the manufacturing is easy, the mounting and dismounting are convenient, and follow-up treatment is simplified.

Description

technical field [0001] The invention belongs to the technical field of organic peroxide preparation, and in particular relates to a method for preparing ethylbenzene hydroperoxide by reactive distillation of ethylbenzene and a reactive distillation tower thereof. Background technique [0002] Ethylbenzene hydroperoxide (EBHP) is an important intermediate in the co-production process of propylene oxide (PO) and styrene (SM). The joint production process of propylene oxide (PO) and styrene (SM) is referred to as PO / SM process, and its reaction process is shown in Figure (1). Its reaction scheme is briefly described as the following three steps: [0003] 1) Liquid-phase ethylbenzene contacts with air to generate ethylbenzene hydroperoxide (EBHP); [0004] 2) The generated ethylbenzene hydroperoxide (EBHP) undergoes an epoxidation reaction with liquid-phase propylene to generate propylene oxide and α-methylbenzyl alcohol (MBA); [0005] 3) α-Methylbenzyl alcohol (MBA) was deh...

Claims

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Application Information

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IPC IPC(8): C07C407/00C07C409/08B01D3/00
CPCB01D3/009C07C407/00C07C409/08Y02P20/10
Inventor 刘继东刘会燕吕建华
Owner HEBEI UNIV OF TECH
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