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Acetylene hydrocarbon selective hydrogenation method

A technology for selective hydrogenation and alkynes, applied in chemical instruments and methods, purification/separation of hydrocarbons, hydrogenation hydrocarbon production, etc., can solve the problems of small liquid space velocity and high product circulation ratio, and increase the effective contact area , high hydrogenation stability, and the effect of avoiding adverse factors

Active Publication Date: 2009-05-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the liquid space velocity of this process is small, the product circulation rate is relatively high compared with the fresh material circulation, and a heat exchanger is installed between each section of the multi-section fixed-bed reactor.

Method used

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  • Acetylene hydrocarbon selective hydrogenation method

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Effect test

preparation example Construction

[0017] Preparation of Catalysts 1-7

[0018] Take Al 2 o 3 The carrier is calcined at 450-600°C for 8 hours, and then the alkali metal and / or alkaline-earth metal nitrate solution is prepared according to the acidity required by the catalyst, and the carrier is immersed in the solution, dried at 80-200°C for 2-6 hours, and then dried at 500-200°C Roast at 1100°C for 3 to 8 hours to obtain the carrier of the present invention; then prepare a palladium chloride or palladium nitrate solution according to the Pd content required by the catalyst, adjust the pH value of the solution to 1.0 to 3.0 with sodium carbonate or sodium bicarbonate, and impregnate the alkali Metal and / or alkaline earth metal carrier, remove the residual liquid after 10-30 minutes, wash with distilled water, then age, dry, and roast to obtain the catalyst precursor; finally prepare copper and IVA elements or cobalt, nickel, One or more soluble salt solutions of molybdenum, tungsten, lanthanum, silver, ceriu...

Embodiment 1

[0027] The raw materials are C4 fraction and raffinate C4 fraction rich in alkynes, and the weight ratio of C4 fraction and raffinate C4 fraction is 1:3. The hydrogenation reactor uses catalyst 1, the catalyst carrier is alumina, the hydrogenation reactor adopts a single-stage isothermal fixed bed, the reaction temperature is 45°C, the reaction pressure is 1.5MPa, and the liquid space velocity is 13.4h -1 , the molar ratio of hydrogen to alkyne is 2.0, Table 2 is the composition of materials before and after the reaction.

[0028] Table 2 Composition of materials before and after reaction

[0029]

Embodiment 2

[0031] The raw material is C4 cut and raffinate C4 cut rich in alkyne, the weight ratio of C4 cut and raffinate C4 cut rich in alkyne is 1:2.8, and hydrogenation reactor adopts catalyst 2, and catalyst carrier is Alumina, the hydrogenation reactor adopts a single-stage isothermal fixed bed, the reaction temperature is 50°C, the reaction pressure is 2.0MPa, and the liquid space velocity is 15.0h -1 , the molar ratio of hydrogen to alkyne is 1.50, Table 3 is the composition of materials before and after the reaction.

[0032] Table 3 Composition of materials before and after reaction

[0033]

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Abstract

The invention relates to a selective hydrogenation method of high unsaturated hydrocarbons in C4 fractions, which is characterized in that salvage stores which are rich in acetylene hydrocarbon and prepared by extracting butadiene are used as the material, and a fixed bed reactor is adopted to obtain 1, 3-budiene by selective hydrogenation under the existence of a catalyst. The adopted process conditions are as follows: the reaction temperature is between 30 DEG C and 90 DEG C, the reaction pressure is between 1.0 MPa and 4.0 MPa and the liquid space velocity is 7 to 20h<-1>. The catalyst is preferably a palladium system catalyst with alumina as a carrier, the specific surface is 50 to 150m<2> / g and the specific pore volume is 0.25 to 1.0ml / g. The method has remarkable good effects on reducing waste of resources and improving economic benefits by effectively utilizing the salvage stores rich in acetylene hydrocarbon and prepared by extracting butadiene.

Description

technical field [0001] The invention relates to a method for selective hydrogenation of highly unsaturated hydrocarbons in C4 fractions, in particular to a method for selective hydrogenation of alkyne-rich residual materials obtained after butadiene extraction. Background technique [0002] During the high-temperature pyrolysis of hydrocarbon steam to produce ethylene, a certain amount of C4 fractions will be produced by-product. In addition to about 40-60% of 1,3-butadiene, these C4 fractions also contain about 0.5-2.0% of alkyne impurities, mainly including methylacetylene (MA), ethylacetylene (EA ), vinyl acetylene (VAC) and butyne, etc. [0003] In industry, this part of C4 fraction is often treated with alkyne removal to recover high-purity 1,3-butadiene, which is used as raw material for synthetic rubber and resin. At present, the extraction of 1,3-butadiene mostly adopts two-stage solvent extraction rectification and one-stage direct rectification. Due to the high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/08C07C7/167C07C11/167
Inventor 钱颖郑云弟梁顺琴蒋彩兰常晓昕孙利民吕龙刚吴杰王廷海王宗宝康宏敏
Owner PETROCHINA CO LTD
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