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Suspension catalyst distillation process for epoxidizing alkene directly

A technology of catalytic distillation and process method, which is applied in the field of direct epoxidation of olefins to prepare epoxy compounds, can solve the problems of temperature control dependence, high reaction pressure, complicated structure, etc., and achieves prevention of thermal decomposition of hydrogen peroxide, improvement of selectivity, and energy consumption. reduced effect

Inactive Publication Date: 2006-04-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of the reactor is complex, the reaction pressure is high, and the temperature control depends on large-scale circulation of materials. After the reaction, the solvent needs to be evaporated and separated for recycling, so the energy consumption is very high.

Method used

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  • Suspension catalyst distillation process for epoxidizing alkene directly
  • Suspension catalyst distillation process for epoxidizing alkene directly
  • Suspension catalyst distillation process for epoxidizing alkene directly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0025]The powdery solid titanium-silicon molecular sieve catalyst and solvent are added to the catalyst storage tank, mixed evenly, and enter the tower together with hydrogen peroxide from the upper part of the reaction section of the tower, and flow countercurrently with the olefins entering the tower from the lower part of the reaction section in one or more ways during the descent process Touch and react. After the epoxides produced by the reaction, the remaining olefins and part of the solvent are vaporized by the heat released by the reaction, they enter the gas-liquid separator through the distillation section and the condenser, and the unreacted gas olefins are recycled after being deoxygenated. The liquid from the gas-liquid separator enters the distillation tower, the crude epoxy product comes out from the top of the tower, and the solvent comes out from the bottom of the tower, part of which flows back into the tower through the intermediate tank, and the other part g...

Embodiment approach 2

[0027] The powdery solid titanium-silicon molecular sieve catalyst and solvent enter the catalyst storage tank, and after being fully mixed, enter the tower together with hydrogen peroxide from the upper part of the reaction section of the tower. Contact and react in countercurrent. The remaining olefins and solvents in the reaction are vaporized by the heat released by the reaction, and enter the gas-liquid separator through the distillation section and condenser, and the separated non-condensable gas is emptied, and the liquid enters the distillation tower, and the unreacted olefins are discharged from the top of the tower for recycling A part of the solvent from the bottom of the tower is used as a diluent to go to the catalyst intermediate tank, and the other part is returned to the tower through the intermediate tank. The unvaporized material in the reaction section goes down into the stripping section, and all the olefins and solvents are taken out to enter the reaction ...

Embodiment approach 3

[0029] The powdered solid titanium-silicon molecular sieve catalyst and solvent enter the catalyst storage tank, and after being fully mixed, enter the tower from the upper part of the reaction section of the tower together with hydrogen peroxide; at the same time, olefins enter the tower from the upper part of the reaction section in one or more ways , and react with the catalyst. The material vaporized by the heat of reaction goes up into the distillation section, in which the olefin returns to the reaction section through fractionation, the solvent vapor enters the gas-liquid separator after being condensed by the condenser, the separated non-condensable gas is emptied, and part of the liquid solvent is refluxed through the intermediate tank to In the tower, the other part is used as diluent to go to the catalyst intermediate tank. The unvaporized material in the reaction section goes down into the stripping section, and all the solvent is returned to the reaction section. ...

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Abstract

The suspended catalytic distillation process of epoxidizing olefin directly includes the simultaneous entering the reaction of catalytic distilling tower of powdered Ti-Si molecular sieve catalyst, solvent, hydrogen peroxide and olefin; simultaneous flow and reaction of catalyst and liquid material mixture inside the tower; separation of solvent from the easy-to-gasify material for reuse; separation of un-gasified material from the catalyst before the catalyst returns to the reaction section; separation of un-reacted olefin from tower top of reactor material for reuse; and obtaining epoxidized product via separating tower top of reactor material. The said process has reaction and separation completed in the same tower, direct application of great amount of reaction heat in evaporating and separating residual reactant and solvent resulting in high reaction heat utilization and lowered power consumption; less side reactions, high selectivity of epoxidized product and other advantages.

Description

technical field [0001] The invention relates to a method for preparing epoxy compounds through direct epoxidation of olefins. More specifically, the present invention relates to the epoxidation reaction of olefins and hydrogen peroxide under the catalysis of fine-grained titanium-silicon molecular sieves and the simultaneous distillation and separation to generate organic epoxides with high selectivity. Background technique [0002] Traditional olefin epoxidation processes include gas phase molecular oxygen oxidation, co-oxidation and chlorine water oxidation. The most successful application of the gas-phase molecular oxygen oxidation method is the production of ethylene oxide. Silver is used as a catalyst to catalyze the direct epoxidation of ethylene and oxygen to produce ethylene oxide. The production process is basically pollution-free and has advanced technology and economy. The co-oxidation method is currently successfully used to produce propyl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D301/12C07D303/04
CPCY02P20/10
Inventor 杜泽学张永强凌云闵恩泽
Owner CHINA PETROLEUM & CHEM CORP
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