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A method for hydrogenation before deethanization of carbon distillate

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

Active Publication Date: 2017-11-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A method for hydrogenation before deethanization of carbon distillate
  • A method for hydrogenation before deethanization of carbon distillate
  • A method for hydrogenation before deethanization of carbon distillate

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, impregnate the above-mentioned carrier in the above-mentioned solution, and let the dihydroxy-2,2-bipyridine be completely loaded on the alumina after standing for 2 hours After being mounted on the carrier, 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-bipyrid...

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, impregnate the above-mentioned carrier in the above-mentioned solution, and let the dihydroxy-2,2-bipyridine be completely loaded on the alumina after standing for 8 hours After being mounted on the carrier, dry at 90°C for 8 hours to obtain hydroxy-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...

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' -Bipyridine was completely loaded on the alumina support, and dried at 120°C for 4h to obtain hydroxy-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 / Al 2 o 3 Precurso...

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Abstract

The invention relates to a method for selective hydrogenation of carbon distillates, which adopts a pre-deethanizer pre-hydrogenation process, enters the top effluent from the pre-deethanizer tower in an ethylene plant into a fixed-bed reactor for selective hydrogenation, It is characterized in that the adiabatic bed reactor is equipped with a Pd-Au-based catalyst, and the catalyst is combined with a bipyridine derivative with a hydroxyl group through an alumina-based carrier during the preparation process, and the hydroxy-bipyridine derivative combined on the carrier has an activity The components form metal complexes; the method of the present invention can greatly improve the activity and selectivity of the hydrogenation reaction, reduce the amount of green oil produced, prolong the service life of the catalyst, and at the same time ensure that the hydrogenation of acetylene is qualified, effectively Increase device ethylene increment.

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 Patents(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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