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One-stage selective hydrogenation catalyst for pyrolysis gasoline and its preparation method and application

A technology for selective hydrogenation and pyrolysis gasoline, which is applied in the field of selective hydrogenation catalyst and its preparation in the first stage of pyrolysis gasoline. To avoid problems such as decreased performance, to achieve good dispersion, mild experimental conditions, and high selectivity

Active Publication Date: 2016-01-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the presence of metal palladium ions in each part, the hydrogenation selectivity decreases
[0005] Chinese patent CN1184289C discloses a catalyst for selective hydrogenation of pyrolysis gasoline and its preparation method and application. The weight of palladium is 0.25-0.35% based on the total weight of the catalyst. Although the catalyst has the characteristics of high space velocity, good selectivity and stability, it does not explain its anti-interference ability, gel capacity and water resistance
[0006] Chinese patent CN85100761A discloses a kind of fiber-supported catalyst for the selective hydrogenation of pyrolysis gasoline fraction diolefins, due to the adoption of η-Al 2 o 3 Porous fibrous carrier, so the catalyst has high activity, but the pore size is too small. When the content of colloid, arsenic and water in the raw material exceeds the standard, the pores on the catalyst are easy to coke and block, which affects the hydrogenation stability of the catalyst

Method used

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  • One-stage selective hydrogenation catalyst for pyrolysis gasoline and its preparation method and application
  • One-stage selective hydrogenation catalyst for pyrolysis gasoline and its preparation method and application
  • One-stage selective hydrogenation catalyst for pyrolysis gasoline and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Pipette 50mgPd / ml of PdCl 25ml of solution, diluted to 10ml with deionized water; 15.8ml of Tx100 and 13.4ml of n-propanol were mixed with 25ml of cyclohexane in a constant temperature water bath at 25°C under magnetic stirring, and then PdCl diluted with water was added 2 Solution, magnetically stirred for a certain period of time until a transparent microemulsion was obtained; a certain amount of hydrazine hydrate was added to the above microemulsion to make the PdCl in the microemulsion 2 Reduced to elemental Pd; weigh 100g Al 2 o 3 Carrier, impregnating the reduced microemulsion onto the carrier. Then dried and calcined to prepare the catalyst A, wherein the Pd content is 0.25wt%.

Embodiment 2

[0040] Weigh out 200mgPd / ml of Pd(NO 3 ) 2 Solution 1.25ml, 200mgPb / ml of Pb(NO 3 ) 2 2.5ml of the solution, diluted to 10ml with deionized water; 16.2ml of NP-10 and 12.2ml of n-butanol mixed with 20ml of isooctane in a constant temperature water bath at 25°C under magnetic stirring, and then added the metal salt solution diluted with water, Magnetic stirring for a certain period of time until obtaining a transparent microemulsion; adding a certain amount of hydrazine hydrate to the above microemulsion to make the Pd(NO in the microemulsion 3 ) 2 and Pb(NO 3 ) 2 Reduced to elemental Pd and Pb; weigh 100g Al 2 o 3 Carrier, impregnating the reduced microemulsion onto the carrier. Then it was dried and calcined to prepare the catalyst B, wherein the Pd content was 0.25wt%, and the Pb content was 0.50wt%.

Embodiment 3

[0042] Weigh out 200mgPd / ml of Pd(NO 3 ) 2 Solution 1.25ml, 200mgPb / ml of Pb(NO 3 ) 2 Solution 2.5ml, mixed, then weighed 10.55gMg(NO 3 ) 2 ·6H 2 Put O into the aqueous solution of Pd and Pb, dilute to 10ml with deionized water; mix 15ml of Tween80 and 10ml of n-butanol with 25ml of n-hexane under magnetic stirring in a constant temperature water bath at 25°C, and then add the metal salt solution diluted with water , magnetic stirring for a certain period of time until a transparent microemulsion is obtained; adding a certain amount of hydrazine hydrate to the above microemulsion to reduce the metal ions in the metal salt solution in the microemulsion to a simple state. Weigh 100gAl 2 o 3 Carrier, the reduced microemulsion is sprayed on the carrier, then dried and calcined to prepare the catalyst C, wherein the Pd content is 0.25wt%, the Pb content is 0.50wt%, and the Mg content is 1.0wt%.

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Abstract

The invention provides a pyrolysis gasoline first stage hydrogenation catalyst, a preparation method and applications thereof. According to the present invention, active components of the catalyst are prepared through a microemulsion method, and are loaded on a carrier, the active components are metal atoms or low valence metal ions, and the main active component Pd of the catalyst has characteristics of particle size of less than 10 nm, controllable and uniform particle size, and good dispersion; the catalyst preparation method has characteristics of simpleness, easy operation, and mild operation conditions; and with application of the catalyst in selective hydrogenation reactions of diene and styrene, high activity, good selectivity and good adhesive capacity performance are provided.

Description

technical field [0001] The invention relates to a supported selective hydrogenation catalyst and its preparation method and application, in particular to a pyrolysis gasoline one-stage selective hydrogenation catalyst and its preparation method and application. Background technique [0002] Pyrolysis gasoline is an important by-product of ethylene industrial production, including C5-C10 fractions. The composition of pyrolysis gasoline is very complex, mainly including benzene, toluene, xylene, mono-olefins, di-olefins, straight-chain alkanes, cycloalkanes, and organic compounds of nitrogen, sulfur, oxygen, chlorine and heavy metals, etc., a total of more than 200 components, of which Benzene, toluene, xylene (collectively referred to as BTX) are about 50-80% aromatics and 25-30% unsaturated hydrocarbons. Industrially, pyrolysis gasoline is used for the extraction of aromatics after selective hydrogenation of the first stage to remove diolefins and styrene, and second stage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01J23/62C10G49/06
Inventor 穆玮卫国宾王秀玲戴伟杨思源乐毅
Owner CHINA PETROLEUM & CHEM CORP
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