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Selective hydrogenation method for C2 fraction

A selective hydrogenation and fractionation technology, applied in hydrocarbons, chemical instruments and methods, purification/separation of hydrocarbons, etc., can solve problems such as inability to form strong interactions, migration and aggregation of metal particles

Active Publication Date: 2013-07-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, after impregnation, no strong interaction can be formed between the metal salt species and the carrier, and high-temperature calcination will easily lead to the migration and aggregation of metal particles to form larger grains.

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

[0065] Catalyst preparation:

[0066] A. Functionalized polyvinyl chloride (PVC) / Al 2 o 3 preparation of

[0067] Weigh Φ4.5mm, length is 4.5mm, specific surface area is 20m 2 / g, the pore volume is 0.30ml / g, the bulk density is 1.0g / cm 3 Columnar Al 2 o 3 Carrier 250g.

[0068] Dissolve 3.0g of PVC completely in 400ml of tetrahydrofuran (THF), impregnate the above-mentioned carrier into the above-mentioned solution, stir for 0.5h and let stand to deposit PVC on Al 2 o 3 Surface, dry and set aside.

[0069] Add 30g of hydroxylamine hydrochloride and 2.0g of Na 2 CO 3 , add 253g PVC / Al 2 o 3 Reflux with 500ml distilled water for 2 hours, cool to room temperature, wash with deionized water until neutral, and dry to obtain functionalized PVC / Al 2 o 3 (In terms of moles, the number of moles of complexing agent hydroxylamine hydrochloride / the number of moles of reactive groups Cl in the macromolecule=9).

[0070] B. (Pd-Ag)-polymer / Al 2 o 3 Precursor preparation

...

Embodiment 2

[0087] Catalyst preparation:

[0088] A. Functionalization-SAN / Al 2 o 3 preparation of

[0089] Weigh 4.5×4.5mm, the specific surface area is 2m 2 / g, the pore volume is 0.12ml / g, and the bulk density is 1.2g / cm 3 Cylindrical carrier Al 2 o 3 Carrier 250g.

[0090] Weigh 15g of polystyrene SAN resin, dissolve it in 300ml of DMF solvent, stir at room temperature to completely dissolve the SAN resin, add 20g of hydroxylamine hydrochloride, add 5g of K 2 CO 3 , heated until it is completely dissolved. After stirring for half an hour, the Al 2 o 3 Add 250g of carrier to the above solution, add 200ml of ethanol dropwise, and keep stirring, take out the product after 1 hour, wash until neutral, and dry to obtain functionalized SAN / Al 2 o 3 . In terms of moles, the number of moles of complexing agent hydroxylamine hydrochloride / the number of moles of reactive groups CN in the macromolecule=1.2.

[0091] B. (Pd-Ag)-polymer / Al 2 o 3 Precursor preparation

[0092] Weigh...

Embodiment 3

[0110] Catalyst preparation

[0111] The carrier is spherical Al 2 o 3 , with a specific surface area of ​​1m 2 / g, the pore volume is 0.15ml / g,

[0112] A. Functionalized polyacrylamide / Al 2 o 3 preparation of

[0113] Weigh 8.0 g of polyacrylamide resin, dissolve it in 300 ml of water, stir at room temperature to completely dissolve the polyacrylamide resin, add the above-mentioned weighed carrier into this solution, stir it well, let it stand for 1 hour, separate the solvent and dry it to obtain Polyacrylamide / Al 2 o 3 .

[0114] The polyacrylamide / Al obtained above 2 o 3 , add to 500ml deionized water, add 25g hydroxylamine hydrochloride, add 5.0gNa 2 CO 3 , heated until it was completely dissolved, and refluxed for 1 hour. After cooling, the product was taken out, washed to neutrality, and dried to obtain functionalized polyacrylamide / Al 2 o 3 . In moles, moles of complexing agent hydroxylamine hydrochloride / reactive group CONH in the polymer 2 Number of ...

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Abstract

The invention relates to a selective hydrogenation method for C2 fraction, which employs a front-end hydrogenation process method of front-end depropanization. The selective hydrogenation method is characterized in that a Pd-Ag catalyst is loaded in a heat-insulation bed reactor, wherein the Pd-Ag catalyst contains Al2O3 used as a carrier, and the contents of Pd and Ag are 0.010-0.4% and 0.02-0.2% respectively if assumed that the weight percentage of the catalyst is 100%, and the Pd-Ag catalyst has a specific surface area of 1-20 m<2> / g and a pore volume of 0.1-0.35 mL / g; during the preparation process of the catalyst, an organic polymer metal complex is formed; and the reaction conditions are as follows: the inlet temperature of the used heat-insulation bed reactor is 45-100 DEG C, the reaction pressure is 3.5-4.5 MPa, and the volume airspeed of gas is 3500-25000 h<-1>. Using the method provided by the invention, the improvement of selectivity facilitates the operation of hydrogenation reaction and excessive hydrogenation is not easy to occur; moreover, at high reaction temperature, the catalyst has good activity, and alkyne leakage is not easy to occur.

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 ethylene is the leader of the petrochemical industry. The selective hydrogenation of acetylene in steam cracking products plays an extremely important role in the ethylene processing industry. In addition to ensuring that the content of acetylene at the outlet of the hydrogenation reactor meets the standard, the selectivity of the catalyst is excellent. It can make ethylene produce as little ethane as possible, which is of great significance for improving the ethylene yield of the whole process and improving the economic benefit of the device. [0003] In the current carbon distillate hydrogenation and removal of alkynes, more and more carbon distillate pre-hydrogenation processes are used. The feature of this process method is that the hydrogenati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C7/167C07C7/163B01J23/50
CPCY02P20/52
Inventor 谭都平王建明梁琨颉伟车春霞高源梁玉龙林宏李耀
Owner PETROCHINA CO LTD
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