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A kind of method for preparing ethylbenzene hydroperoxide by reactive distillation of ethylbenzene and reactive distillation tower thereof

A technology of ethylbenzene hydroperoxide and rectification tower, which is applied to the preparation of peroxygen compounds, chemical instruments and methods, separation methods, etc., and can solve the problem that the reactor volume cannot be effectively used, the reactor temperature control is complicated, and the horizontal placement Problems such as large footprint, to achieve the effect of improving conversion rate and selectivity, simple production, and simplified subsequent processing

Active Publication Date: 2021-10-01
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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  • A kind of method for preparing ethylbenzene hydroperoxide by reactive distillation of ethylbenzene and reactive distillation tower thereof
  • A kind of method for preparing ethylbenzene hydroperoxide by reactive distillation of ethylbenzene and reactive distillation tower thereof
  • A kind of method for preparing ethylbenzene hydroperoxide by reactive distillation of ethylbenzene 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

Disclosed is a method for preparing ethylbenzene hydroperoxide by reactive rectification of ethylbenzene and a reactive rectification tower thereof. Catalyst packages are fixed between gas-lift hoods of the trays, and the catalyst packages further include strip-shaped catalysts. The invention has high efficiency, and the raw material passes through the catalyst and the plate separation and purification unit for many times, thereby improving the conversion rate and selectivity; meanwhile, the preparation is simple, the installation and disassembly are convenient, and the subsequent 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 formula (1). Its reaction scheme is briefly described as the following three steps: [0003] 1) Liquid ethylbenzene reacts with air to form ethylbenzene hydroperoxide (EBHP); [0004] 2) The resulting 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 dehydrated to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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