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Selective hydrogenation method for C2 fraction

A selective hydrogenation and fractionation technology, applied in the direction of hydrocarbons, chemical instruments and methods, purification/separation of hydrocarbons, etc., can solve the problem of weak complexation, insufficient loading of active components, and complicated process And other issues

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 functionalized polymer and Pd The complexation 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 flow

Method used

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  • Selective hydrogenation method for C2 fraction
  • Selective hydrogenation method for C2 fraction
  • Selective hydrogenation method for C2 fraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 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.

[0054] Dissolve 39.42g of 4,4-dihydroxy-2,2-bipyridine in 700mL ethanol solution, impregnate the above carrier in the above solution, and let it stand for 2 hours to fully load 4,4-dihydroxy-2,2-bipyridine After being placed on the alumina carrier, it was dried at 60°C for 10 hours to obtain hydroxy-bipyridine / Al 2 o 3 Prebody.

[0055] Weigh 0.18gPd(NO 3 ) 2 , 0.24gAgNO 3 , dissolved in 500mL of deionized water, added 10ml of nitric acid and stirred until completely dissolved, adjusted the pH value to 2.6, and prepared a mixed solution. The above-mentioned hydroxyl-bipyridine / Al 2 o 3 The precursor was added to the prepared solution, stirred for 10 minutes, left to stand for 2 hours, and the residue was poured out to obtain PdAg-hydroxyl-bipyridine / Al 2 o 3 Precursor (number of moles of hydroxyl-bipyridine: (Pd+Ag)=100). Afte...

Embodiment 2

[0074] Weigh Φ4.0×4.0mm, the specific surface area is 7m 2 / g, 500g of cylindrical carrier with a pore volume of 0.38ml / g, which contains α-Al 2 o 3 460g,TiO 2 40g.

[0075] Dissolve 104.89g of 4,4-dihydroxy-2,2-bipyridine in 800mL of ethanol solution, impregnate the above carrier in the above solution, let stand for 8 hours to fully load 4,4-dihydroxy-2,2-bipyridine After being placed on the alumina support, it was dried at 90°C for 8 hours to obtain hydroxy-bipyridine / Al 2 o 3 Prebody.

[0076] Weigh 0.49gPd(NO 3 ) 2 , 0.79gAgNO 3 , dissolved in 500mL deionized water, add 10ml nitric acid and stir until completely dissolved, adjust the pH value to 2.5, and prepare a mixed solution, 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 4 hours to obtain PdAg-hydroxy-bipyridine / Al 2 o 3 Precursor (number of moles...

Embodiment 3

[0097] Weigh Φ3.7mm, the specific surface area is 20m 2 Al 2 o 3 It is a mixed crystal form of θ and α.

[0098] Dissolve 4.4g 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.

[0099] Weigh 0.61gPd(NO 3 ) 2 ,1.57gAgNO 3 , dissolved in 500mL of deionized water, added 10ml of nitric acid and stirred until completely dissolved, adjusted to pH 3.0, prepared into a mixed solution, the above-mentioned hydroxyl-bipyridine / Al 2 o 3 Add the precursor to the prepared solution, stir for 60 minutes, let it stand for 12 hours, pour out the residual liquid, and dry the remaining solid at 100°C for 8 hours to obtain PdAg-hydroxy-bipyridine / Al 2 o 3 Precursor (number of hydroxyl-bipyridine moles: (Pd+Ag)=2).

[0100] The precursors prepared a...

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Abstract

The invention relates to a selective hydrogenation method for a C2 fraction. In the method, a front hydrogenation process method with front depropanization is employed, wherein a material flow discharged from the top of a front depropanizing column in an ethylene apparatus is fed into a fixed bed reactor to perform the selective hydrogenation. A Pd-Ag-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 reduces influences on an apparatus due to temperature runaway, improves operation safety, ensures qualified hydrogenation on the acetylene, and improves the stability of operation in the 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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IPC IPC(8): C07C7/167C07C11/04B01J23/50
CPCY02P20/52
Inventor 梁玉龙车春霞谭都平钱颖韩伟王涛张峰高源谷丽芬程琳胡晓丽李晓银丛日新黄德华蔡小霞
Owner PETROCHINA CO LTD
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