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Method of front hydrogenation of C2 fraction with front deethanization

A technology of pre-hydrogenation and pre-removal, which is applied in the fields of hydrocarbons, chemical instruments and methods, and hydrogenation to hydrocarbons, etc., can solve the problems of complex process flow, increased catalyst cost, weak complexation, etc., and achieves obvious alloy structure. , excellent activity and selectivity, strong effect of alloying

Active Publication Date: 2016-07-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this patented method, the carrier adsorbs a specific polymer compound through the chemical adsorption of the hydroxyl group of alumina and the polymer, and the amount of the polymer compound adsorbed by the carrier will be limited by the number of hydroxyl groups of alumina; The cooperation effect is not strong, and sometimes the loading capacity of the active components does not meet the requirements, and some active components remain in the impregnation solution, resulting in an increase in the cost of the catalyst; the preparation of carbon dioxide hydrogenation catalysts by this method also has the disadvantage of complicated process

Method used

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  • Method of front hydrogenation of C2 fraction with front deethanization
  • Method of front hydrogenation of C2 fraction with front deethanization
  • Method of front hydrogenation of C2 fraction with front deethanization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Weigh Φ4.5mm, length is 4.5mm, specific surface area is 17m 2 / g, columnar α-Al with a pore volume of 0.22ml / g 2 o 3 Carrier 500g.

[0065] Dissolve 27.9g of 4,4-dihydroxy-2,2-bipyridine in 700mL ethanol solution, immerse the above-mentioned carrier in the above-mentioned solution, and let the dihydroxy-2,2-bipyridine be completely loaded on the alumina carrier after standing for 2 hours After drying, dry at 60°C for 10 hours to obtain hydroxy-bipyridine / Al 2 o 3 Prebody.

[0066] Weigh an appropriate amount of palladium chloride, chloroauric acid dissolved in 500mL deionized water containing an appropriate amount of hydrochloric acid, adjust the pH to 2.3, and prepare a mixed solution. The above-mentioned hydroxyl-bipyridine / Al 2 o 3 Add the precursor to the prepared solution, stir for 10 minutes, let it stand for 2 hours, and pour off the residual liquid to obtain PdAu-hydroxy-bipyridine / Al 2 o 3 Precursor (number of moles of hydroxyl-bipyridine: (Pd+Au)=100)...

Embodiment 2

[0078] Weigh Φ3.5×3.5mm, the specific surface area is 37m 2 / g, 500g of cylindrical carrier with a pore volume of 0.38ml / g, containing Al 2 o 3 400g,TiO 2 100g, Al 2 o 3 It is a mixed crystal form of θ and α.

[0079] Dissolve 42.89g of 4,4-dihydroxy-2,2-bipyridine in 800mL ethanol solution, immerse the above carrier in the above solution, and let the dihydroxy-2,2-bipyridine be completely loaded on the alumina carrier after standing for 8 hours After drying at 90°C for 8 hours, the hydroxyl-bipyridine / Al 2 o 3 Prebody.

[0080]Weigh an appropriate amount of palladium chloride, chloroauric acid is dissolved in 600mL deionized aqueous solution containing an appropriate amount of hydrochloric acid, adjust the pH value to 3.0, and prepare a mixed solution, and the above-mentioned hydroxyl-bipyridine / Al 2 o 3 Add the precursor to the prepared solution, stir for 60 minutes, let it stand for 8 hours, pour out the residual liquid, and dry the remaining solid at 110°C for 6 h...

Embodiment 3

[0098] Weigh Φ3.0mm, the specific surface area is 3.0m 2 / g, the pore volume is 0.25ml / g, the heap ratio is 0.95g / ml toothed spherical carrier 500g, in which α-Al 2 o 3 460g, 40g of titanium oxide.

[0099] Dissolve 1.14g of 6,6'-dihydroxy-3,3'-bipyridine in 600mL ethanol solution, impregnate the above carrier in the above solution, and let 6,6'-dihydroxy-3,3'- After the bipyridine was completely loaded on the alumina carrier, it was dried at 120°C for 4 h to obtain the hydroxyl-bipyridine / Al 2 o 3 Prebody.

[0100] Weigh an appropriate amount of palladium chloride, chloroauric acid is dissolved in 600mL deionized aqueous solution containing an appropriate amount of hydrochloric acid, adjust the pH to 3.5, and prepare a mixed solution. The above-mentioned hydroxyl-bipyridine / Al 2 o 3 Add the precursor to the prepared solution, stir for 60min, let it stand for 12h, pour out the residual liquid, and dry the remaining solid at 100°C for 8h to obtain PdAu-hydroxy-bipyridine / ...

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Abstract

The invention relates to a selectivity method of front hydrogenation of a C2 fraction. In the method, a front hydrogenation process method with front deethanization is employed, wherein a material flow discharged from the top of a front deethanization column in an ethylene apparatus is fed into a fixed bed reactor to perform the selective hydrogenation. A Pd-Au-series catalyst is arranged in an adiabatic bed reactor. During preparation of the catalyst, an alumina-series carrier is combined with a bipyridine derivative having a hydroxyl group, wherein a metal complex is formed from the hydroxyl bipyridine derivative combined on the carrier and an active component. The method greatly improves activity and selectivity of hydrogenation reaction, reduces generation quantity of green oil, prolongs catalyst service life, ensures qualified hydrogenation on the acetylene and increases the yield of the ethylene apparatus.

Description

technical field [0001] The invention relates to a method for selective hydrogenation, in particular to a method for selective hydrogenation of carbon distillates to remove acetylene. Background technique [0002] The production of polymer grade ethylene is the leader of the petrochemical industry, and polymer grade ethylene and propylene are the most basic raw materials for downstream polymerization units. Among them, the selective hydrogenation of acetylene has an extremely important impact on the ethylene processing industry. In addition to ensuring that the acetylene content at the outlet of the hydrogenation reactor reaches the standard, the selectivity of the catalyst is excellent, which can make ethylene generate as little ethane as possible, which is beneficial to improving the entire process. It is of great significance to improve the ethylene yield of the process and improve the economic benefits of the device. [0003] The cracked carbon distillate contains acetyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C7/167C07C5/09C07C7/163B01J23/52
CPCY02P20/52
Inventor 景喜林谭都平车春霞高源梁玉龙韩伟张忠东常晓昕付含琦谷丽芬王玲玲杨珊珊景丽胡晓丽蔡小霞
Owner PETROCHINA CO LTD
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