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A kind of pyrolysis gasoline selective hydrogenation catalyst and its preparation method and application

A technology for selective hydrogenation and pyrolysis of gasoline, applied in the direction of catalyst activation/preparation, selective hydrorefining, chemical instruments and methods, etc., can solve the problem of catalyst hydrogenation stability, many control and influencing factors, and easy coking of pores Problems such as clogging can be avoided, and the effect of easy preparation and production, improved preparation method and good glue capacity can be achieved.

Active Publication Date: 2016-08-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN85100761A discloses a fiber-supported catalyst for the selective hydrogenation of diolefins in pyrolysis gasoline fractions. Due to the use of η-Al2O3 porous fiber-shaped supports, the catalyst has high activity, but the pore size is too small. When the colloid in the raw material , arsenic content, and water content exceed the standard, the pores on the catalyst are easy to coke and block, which affects the hydrogenation stability of the catalyst
[0008] Traditionally, the microemulsion system is composed of water phase, oil phase, surfactant and co-surfactant, the system is relatively complex, and there are many controlling and influencing factors

Method used

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  • A kind of pyrolysis gasoline selective hydrogenation catalyst and its preparation method and application
  • A kind of pyrolysis gasoline selective hydrogenation catalyst and its preparation method and application
  • A kind of pyrolysis gasoline selective hydrogenation catalyst and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0037] Pipette 50mgPd / mlPd(NO 3 ) 2 Solution 5ml, weigh 1200mg of polyvinylpyrrolidone (PVP), and dilute to 12g with deionized aqueous solution. Mix 12g Brij35 with 20g cyclohexane in a constant temperature water bath at 65°C under magnetic stirring, then add the prepared PVP and Pd(NO 3 ) 2 Solution, magnetically stirred until a transparent microemulsion is obtained; adding hydrazine hydrate to the above microemulsion to make the Pd(NO in the microemulsion 3 ) 2 Reduced to elemental Pd; weigh 100g Al 2 o 3 Carrier, impregnating the reduced microemulsion onto the carrier. Then dry and calcined to prepare the catalyst A, wherein the Pd content is 0.25wt%.

Embodiment 2

[0039] Weigh 200mgPd / ml of PdCl respectively 2 Solution 1.5ml, 50mgPb / ml PbCl 2 Solution 6ml, weigh polyacrylamide (PAM) 200mg. Dilute to 15g with deionized water, mix 5g AOT with 25g n-octane under magnetic stirring in a constant temperature water bath at 70°C, then add the prepared PAM and metal salt solution, and stir magnetically until a transparent microemulsion is obtained; A certain amount of potassium borohydride hydrate is added to the microemulsion to make the PdCl in the microemulsion 2 and PbCl 2 Reduced to elemental Pd and Pb; weigh 100g SiO 2 Carrier, impregnating the reduced microemulsion onto the carrier. Then dry and roast to prepare the catalyst B, wherein the Pd content is 0.3wt%, and the Pb content is 0.3wt%.

Embodiment 3

[0041] 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 10.55g Mg(NO 3 ) 2 ·6H 2 O and weigh 100 mg of hydroxymethyl cellulose and put it into the aqueous solution of Pd and Pb. Dilute to 20g with deionized water, mix 10g Brij30 and 8g AOT with 22g n-butane in a constant temperature water bath at 40°C under magnetic stirring, then add the prepared hydroxymethylcellulose and metal salt solution, and magnetically stir until A transparent microemulsion is obtained; a certain amount of hydrazine hydrate is added to the above microemulsion to reduce the metal salt solution in the microemulsion to an elemental state. Weigh 100g Al 2 o 3 Carrier, the reduced microemulsion is sprayed onto the carrier, then dried and roasted 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% of the total mass.

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Abstract

The invention discloses a pyrolysis gasoline selective hydrogenation catalyst which comprises a carrier and a metal active component loaded on the carrier, wherein the metal active component is prepared in a micro-emulsion method system of a non-auxiliary surface active agent containing high-molecular polymer water phase, and the carrier is one selected from aluminum oxide, titanium oxide, magnesium oxide, zinc oxide, kieselguhr, molecular sieve, kaolin and cordierite; the active component comprises a main active component and an auxiliary active component, wherein the main active component is palladium, and the content of the main active component is 0.01-1.0wt% of the total weight of the carrier; the high-molecular polymer is water-soluble high-molecular polymer. The pyrolysis gasoline selective hydrogenation catalyst is higher in activity, better in selectivity and better in glue dissolution capability in a reaction, the preparation technology of the catalyst is simple and convenient, and the particle shape of the catalyst can be well controlled.

Description

technical field [0001] The invention relates to a selective hydrogenation catalyst for petroleum hydrocarbon products and its preparation method and application, in particular to a one-stage selective hydrogenation catalyst for pyrolysis gasoline and its preparation method and application. Background technique [0002] Pyrolysis gasoline is an important by-product of steam cracking industrial production of ethylene and propylene, 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, and xylene (collectively referred to as BTX) are about 50-90%, and unsaturated hydrocarbons are 25-30%. According to the characteristics of a large amount of aromatics in pyrolysis gasoline, it has a wide range of us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/02B01J35/00B01J23/44B01J23/62C10G45/40C10G45/52
Inventor 戚文新李前卫国宾彭晖戴伟刘海江
Owner CHINA PETROLEUM & CHEM CORP
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