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with silica and tcl 4 Method for preparing highly active propylene and hydrogen peroxide gas-phase epoxidation catalyst by gas-solid phase reaction

A technology of oxidation catalyst and white carbon black, which is applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of reducing the catalytic activity of the catalyst, reducing the reliability of the catalyst, and affecting the diffusion performance of the catalyst.

Active Publication Date: 2021-07-06
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But unfortunately, even if polymethylhydrogensiloxane with a low degree of polymerization is used as a modifier, the large size of the polymer will affect the diffusion performance of the catalyst in the liquid phase reaction, thereby reducing the catalyst's Catalytic activity
Moreover, this increasingly complex post-modification treatment significantly reduces the reliability of the catalyst
[0041] It can be seen from the above reports that even for liquid-phase epoxidation reactions, by adding TiCl 4 Amorphous Ti / SiO Grafted on SiO 2 Catalysts also have limitations

Method used

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  • with silica and tcl <sub>4</sub> Method for preparing highly active propylene and hydrogen peroxide gas-phase epoxidation catalyst by gas-solid phase reaction
  • with silica and tcl <sub>4</sub> Method for preparing highly active propylene and hydrogen peroxide gas-phase epoxidation catalyst by gas-solid phase reaction
  • with silica and tcl <sub>4</sub> Method for preparing highly active propylene and hydrogen peroxide gas-phase epoxidation catalyst by gas-solid phase reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] The first step is to dry and pre-calcine the white carbon black raw material.

[0092] In this example, a commercially available fumed silica is used as the raw material, and its main specifications are characterized by a specific surface area of ​​380m 2 / g. In order to facilitate the drying and roasting pretreatment under the flowing atmosphere in the laboratory, the silica was first pressed into tablets and sieved, and the silica with a particle size of 20-40 mesh was selected as the experimental sample. The drying and roasting pretreatment of the experimental samples were carried out in situ on the gas-solid phase grafting reaction device. A schematic diagram of the reaction apparatus is attached figure 1 .

[0093] Add 6g of white carbon black with a particle size of 20-60 mesh into the reaction tube of the reaction device. Then, the silica was subjected to drying pretreatment in a nitrogen flow (60 ml / min), the drying temperature was 110° C., and the drying ti...

Embodiment 2

[0116] Repeat embodiment 1, but in the hydrothermal crystallization treatment stage of the 3rd step, the consumption of tetrapropyl ammonium hydroxide is mold silicon ratio (TPA + / SiO 2 ) by changing the template solution concentration to 0.03, 0.039, 0.048 respectively, keeping the water-to-silicon ratio unchanged, and prolonging the hydrothermal crystallization time to 72 hours. It corresponds to the mold-to-silicon ratio (TPA + / SiO 2 ) were 0.03, 0.039 and 0.048 in sequence, and the gas phase epoxidation reaction results of propylene in the sample were: the conversion rate of propylene was 6.3%, 11.8% and 15.2% in sequence, and the effective utilization rate of hydrogen peroxide was 27.6%, 50.7% and 67.8% in sequence .

[0117] This example illustrates that the die-to-silicon ratio (TPA + / SiO 2 ) is the influence of silica TiCl 4 important factor in the outcome of hydrothermal crystallization of grafts. But adopt catalyst preparation method provided by the inventi...

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Abstract

with silica and TiCl 4 The invention relates to a method for preparing a highly active propylene and hydrogen peroxide gas-phase epoxidation catalyst by gas-solid phase reaction, belonging to the technical field of petrochemical catalysts. In this method, the TiCl 4 Grafted onto silica by gas-solid phase reaction to obtain titanium grafts of silicon oxide, and then disperse the titanium grafts in tetrapropyl quaternary ammonium cation TPA + In this case, the dispersion will not form a gel, and only a small amount of tetrapropyl quaternary ammonium cationic template needs to be added to obtain the crystallized product of TS-1 zeolite. The present invention is beneficial to reduce the synthesis cost of TS-1 zeolite crystallization product, and the crystallization product has high crystallinity, more importantly, its catalytic activity to the gas-phase epoxidation reaction of propylene and hydrogen peroxide is very high, thus in the reaction competition Effectively suppress the ineffective decomposition reaction of hydrogen peroxide reaction raw materials, and greatly improve the effective utilization rate of hydrogen peroxide under gas phase epoxidation reaction conditions.

Description

technical field [0001] The invention belongs to the technical field of petrochemical catalysts, and relates to a preparation method of a catalyst for gas-phase epoxidation of propylene and hydrogen peroxide. Background technique [0002] Propylene oxide (PO) is the target product of gas-phase epoxidation of propylene and hydrogen peroxide. PO is an important downstream product of propylene, mainly used in the production of polyether polyols, propylene glycol and propylene glycol ethers. The downstream industrial chain of PO is very developed, and the terminal applications involve many fields such as chemical industry, home appliances, automobiles, construction, aerospace, food, tobacco, medicine and cosmetics. [0003] At present, the industrial production process of PO has three technical routes: chlorohydrin method, co-oxidation method (including co-oxidation of isobutane, ethylbenzene and cumene) and liquid-phase epoxidation method of propylene and hydrogen peroxide (HPP...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/89C01B39/08C07D301/12C07D303/04
CPCB01J29/89C01B39/08C01P2002/72C01P2002/84C01P2004/03C07D301/12C07D303/04
Inventor 郭洪臣刘宏伟祝全仁
Owner DALIAN UNIV OF TECH
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