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Selective hydrogenation method of alkyne in C4 hydrocarbon stream

A technology for selective hydrogenation and C-tetrahydrocarbons, which is applied in the purification/separation of hydrocarbons and hydrocarbons, chemical instruments and methods, etc. It can solve the problems of complex catalyst composition and cumbersome preparation process, and achieve high selectivity and high reaction. The effect of performance, good stability

Active Publication Date: 2014-02-05
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 of alkyne in C4 hydrocarbon stream
  • Selective hydrogenation method of alkyne in C4 hydrocarbon stream

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take 13.5ml 10mg / ml PdCl 2 Solution, add 1mol / L NaOH solution dropwise to adjust the pH to 5.6, then spray to 100.0g Al 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

[0043] 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 of alkyne in a C4 hydrocarbon stream. The selective hydrogenation method comprises the steps of introducing the C4 hydrocarbon stream containing alkyne together with hydrogen into a hydrocarbon reactor with a supported palladium catalyst, carrying out selective hydrocarbon on alkyne in the C4 hydrocarbon stream at the inlet temperature of 10-80 DEG C in a molar ratio of hydrogen to alkyne of 1-10 at the reaction pressure of 0.1-4MPa so as to form olefin / alkadiene, then removing alkyne, wherein the supported palladium catalyst comprises a carrier, palladium and a selectable modified component. In the invention, a carbon monoxide absorption in situ infrared spectroscopy is used so as to test olefin / alkadiene at the temperature of 40 DEG C, and in the obtained infrared spectrogram, the area ratio of bridge type absorption peak at the part of 1930-1990cm<-1> to bridge type absorption peak at the part of 1870-1930cm<-1> is less than 0.2, more preferably 0.15. The method has high selectivity on the selective hydrogenation of alkyne in the C4 hydrocarbon stream and can operate for a long period.

Description

technical field [0001] The present invention relates to a method for selective hydrogenation, more specifically, the present invention relates to a method for selective hydrogenation of alkynes in C4 hydrocarbon streams. Background technique [0002] 1,3-Butadiene is an important chemical raw material for the production of synthetic rubber. Cracking mixed C4 contains about 50% 1,3-butadiene, which is the main source of butadiene. At present, the process of separating butadiene from mixed carbon four mainly adopts two-stage solvent extraction and rectification, wherein one stage separates butene, butane, etc. from crude butadiene, and the second stage separates alkynes ( Including vinyl acetylene (VA), ethyl acetylene (MA) and methyl acetylene (MA)) removal, followed by rectification and purification to obtain polymer grade butadiene. The disadvantages of this process are high energy consumption, high material loss and low process economy. [0003] Alkyne removal from C4 f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/167C07C5/09C07C7/167B01J37/34B01J23/44B01J23/63G01N21/3504G01N21/3563
Inventor 乐毅戴伟于海波彭晖张齐朱云仙杨栋毛祖旺穆玮卢红亮
Owner CHINA PETROLEUM & CHEM CORP
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