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Selective Hydrogenation of Carbon Distillates

A selective hydrogenation and fractionation technology, applied in hydrocarbons, chemical instruments and methods, purification/separation of hydrocarbons, etc., can solve problems such as complex process flow, insufficient loading of active components, and increased catalyst cost

Active Publication Date: 2018-02-02
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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  • Selective Hydrogenation of Carbon Distillates
  • Selective Hydrogenation of Carbon Distillates
  • Selective Hydrogenation of Carbon Distillates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 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.

[0062] Dissolve 39.42g 4,4-dihydroxy-2,2-bipyridine in 700mL ethanol solution, immerse the above-mentioned carrier in the above-mentioned solution, and let it stand for 2h so that the dihydroxy-2,2-bipyridine is completely loaded on alumina After being on the carrier, dry at 60°C for 10 hours to obtain hydroxy-bipyridine / Al 2 O 3 Forebody.

[0063] Weigh 0.18g Pd(NO 3 ) 2 , 0.24g AgNO 3 , Dissolve in 500mL deionized water, add 10mL nitric acid and stir until completely dissolved, adjust the pH to 2.8, and prepare a mixed solution. The above hydroxy-bipyridine / Al 2 O 3 Add the precursor to the prepared solution, stir for 10 minutes, let stand for 2 hours, pour out the remaining liquid to obtain PdAg-hydroxy-bipyridine / Al 2 O 3 Precursor (number of moles of hydroxyl-bipyridine: (Pd+Ag)=100). After drying at 120℃, calcining in air atmosphere at 5...

Embodiment 2

[0074] Weigh Φ3.5×3.5mm, the specific surface area is 13m 2 / g, 500g cylindrical carrier with pore volume 0.38ml / g, which contains Al 2 O 3 400g, TiO 2 100g, Al 2 O 3 It is a mixed crystal form of θ and α.

[0075] Dissolve 61.28g 4,4-dihydroxy-2,2-bipyridine in 800mL ethanol solution, immerse the above-mentioned carrier in the above-mentioned solution, and let it stand for 8h so that the dihydroxy-2,2-bipyridine is completely loaded on alumina After being on the carrier, dry at 90°C for 8 hours to obtain hydroxy-bipyridine / Al 2 O 3 Forebody.

[0076] Weigh 0.49g Pd(NO 3 ) 2 ,1.18g AgNO 3 , Dissolved in 600mL deionized water, add 10ml of nitric acid and stir until completely dissolved, adjust the pH to 2.5, prepare a mixed solution, and combine the above-mentioned hydroxy-bipyridine / Al 2 O 3 The precursor was added to the prepared solution, stirred for 60 minutes, allowed to stand for 8 hours, and the remaining liquid was poured out. The remaining solid was dried at 110°C for 6 hour...

Embodiment 3

[0094] Weigh Φ3.0mm, the specific surface area is 3.0m 2 / g, 500g tooth spherical carrier with pore volume of 0.25ml / g and bulk ratio of 0.95g / ml, of which α-Al 2 O 3 460g, 40g titanium oxide.

[0095] Dissolve 1.14g of 6,6'-dihydroxy-3,3'-bipyridine in 600mL ethanol solution, immerse the above carrier in the above solution, and let it stand for 12h to make 6,6'-dihydroxy-3,3' -After bipyridine is completely loaded on the alumina carrier, dry at 120°C for 4 hours to obtain hydroxy-bipyridine / Al 2 O 3 Forebody.

[0096] Weigh 0.62gPd(NO 3 ) 2 ,1.57gAgNO 3 , Dissolved in 600mL of deionized water, add 10ml of nitric acid and stir until completely dissolved, adjust the pH to 3.2, prepare a mixed solution, combine the above hydroxy-bipyridine / Al 2 O 3 The precursor was added to the prepared solution, stirred for 60 minutes, allowed to stand for 12 hours, and the remaining liquid was poured out. The remaining solid was dried at 100°C for 8 hours to obtain PdAg-hydroxy-bipyridine / Al 2 O 3 ...

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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-Ag-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 production, prolong the service life of the catalyst, and at the same time ensure that the hydrogenation of acetylene is qualified, achieving the goal of improving the efficiency of the device. operational stability.

Description

Technical field [0001] The invention relates to a selective hydrogenation method, in particular to a method for selective hydrogenation of carbon two fractions to remove acetylene. Background technique [0002] Polymer grade ethylene production 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 meets the standard, the selectivity of the catalyst is excellent, which can make ethylene generate as little ethane as possible, which is helpful for improving the entire process. The ethylene yield of the process is of great significance to improve the economic efficiency of the device. [0003] The pyrolysis C2 fraction contains 0.5%-2.5% mole fraction of acetylene. When ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C7/167B01J23/50
CPCY02P20/52
Inventor 车春霞谭都平路明韩伟黄德华何崇慧梁玉龙张峰吕龙刚梁顺琴高源巩红光石岚常晓昕杨珊珊王玲玲谷丽芬程琳
Owner PETROCHINA CO LTD