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Selective hydrogenation method for allylene and allene in propylene material flow

A technology for selective hydrogenation and propadiene, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, hydrogenation to hydrocarbons, etc., can solve the problems of complex catalyst composition and cumbersome preparation process, and achieve High propylene selectivity, high reactivity, energy saving effect

Active Publication Date: 2011-11-23
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 need to include specific Pd precursors or crystal form control agents in the preparation process, the composition of the catalyst becomes complicated and the preparation process is more cumbersome
In addition, the adsorption capacity of the reactants on the surface of the catalyst noble metal is an important factor affecting its activity and selectivity, which has not been reflected in the existing literature.

Method used

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  • Selective hydrogenation method for allylene and allene in propylene material flow
  • Selective hydrogenation method for allylene and allene in propylene material flow
  • Selective hydrogenation method for allylene and allene in propylene material flow

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Take 13.5ml 10mg / ml PdCl 2 Solution, add 1mol / L NaOH solution dropwise to adjust the pH to 5.6, then spray to 100.0gAl 2 o 3 Spherical carrier surface, use 20ml of 50% v / v isopropanol aqueous solution to wet the carrier, and use it under vacuum 60 The Coγ radiation source was irradiated at room temperature for 15 hours, and the absorbed dose rate was 35Gy / min. After irradiation, the sample was placed in an oven, and dried at 80° C. and 120° C. for 12 hours in turn to obtain the catalyst A, which had a gray-black appearance and a Pd content of 0.135 wt%.

Embodiment 2

[0042] Take 30ml 10mg / ml PdCl 2 solution, sprayed to 100.0g of La and K modified Al 2 o 3 Spray 5ml of 1mol / L NaOH solution on the surface of the toothed spherical carrier, use 20ml of 50% v / v isopropanol aqueous solution to wet the carrier, and use it under vacuum 60 The Coγ radiation source was irradiated at room temperature for 15 hours, and the absorbed dose rate was 70Gy / min. After irradiation, the sample was placed in an oven, and dried at 80° C. and 120° C. for 12 hours in turn to obtain the catalyst B, which had a gray appearance and a Pd content of 0.300 wt%.

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Abstract

The invention provides a selective hydrogenation method for allylene and allene in propylene material flow. The method comprises the following steps of: introducing the propylene material flow containing 1-(methylamino)-2,3-propanediol (MAPD) and hydrogen into a hydrogenation reactor filled with a supported palladium catalyst, and performing selective hydrogenation on the MAPD in the propylene material flow at the inlet temperature of between 10 and 80 DEG C and a molar ratio of the hydrogen to the MAPD of 1-5 under the reaction pressure of 0.1-4Mpa, so that the MAPD becomes propylene and is removed, wherein the catalyst comprises a carrier, palladium and optional modifying components; and a carbon monoxide adsorption in situ infrared ray spectroscopy is used for testing the catalyst at 40DEG C, and an area ratio of a bridge absorption peak at a position of 1,930-1,990cm<-1> to a bridge absorption peak at a position of 1870-1,930cm<-1> in an infrared spectrum is less than 0.2 and preferably less than 0.15. By the method, the selective hydrogenation reaction for the allylene and allene in the propylene material flow has high selectivity, and can be stably performed for a long period.

Description

technical field [0001] The present invention relates to a selective hydrogenation process, more particularly, the present invention relates to a selective hydrogenation process for propyne and propadiene in propylene streams. Background technique [0002] Propylene is usually produced by thermal cracking of liquid or gaseous hydrocarbons. After the cracked gas is separated, the content of propyne and propadiene (collectively called MAPD) ​​in the C3 fraction can reach 5-7 mol%. Because the presence of alkynes and dienes will seriously affect the quality of polyolefin products and increase the consumption of polymerization catalysts, it is generally required that the content of acetylene or MAPD be less than 5ppm or even lower for polymerization grade ethylene and propylene. The selective hydrogenation method is often used in the industry to selectively hydrogenate the MAPD in the C3 fraction to generate propylene, and finally obtain high-purity ethylene and propylene produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C5/09C07C5/05C07C7/167C07C7/163B01J37/34B01J23/44B01J23/63G01N21/35G01N21/3504
CPCY02P20/52
Inventor 于海波戴伟毛祖旺彭晖张齐乐毅穆玮卢红亮
Owner CHINA PETROLEUM & CHEM CORP
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