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Selective hydrogenation method for C3 fraction

A technology for selective hydrogenation and fractionation. It is applied in the fields of hydrocarbons, chemical instruments and methods, and hydrocarbon purification/separation. It can solve problems such as increasing the difficulty of operation, improve safety, reduce the risk of overheating, and improve Effect of liquid phase volumetric space velocity

Active Publication Date: 2011-10-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also increases the difficulty of operation

Method used

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  • Selective hydrogenation method for C3 fraction
  • Selective hydrogenation method for C3 fraction
  • Selective hydrogenation method for C3 fraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Catalyst preparation:

[0061] A. Functionalized polyvinyl chloride (PVC) / Al 2 o 3 preparation of

[0062] Weigh Φ4.5mm, length is 4.5mm, specific surface area is 100m 2 / g, columnar Al with a pore volume of 0.60ml / g 2 o 3 Carrier 250g.

[0063] Dissolve 10g of PVC completely in 400ml of tetrahydrofuran (THF), impregnate the above-mentioned carrier into the above-mentioned solution, stir and let stand to deposit PVC on Al 2 o 3 Surface, dry. Get 260gPVC / Al 2 o 3 product.

[0064] Add 80g of dicyandiamide to 500ml of distilled water, stir to dissolve completely, then add 260g of PVC / Al 2 o 3 Reflux for 120min, cool to room temperature, wash with deionized water until neutral, and dry to obtain functionalized PVC / Al 2 o 3 . In moles, the moles of complexing agent dicyandiamide / moles of reactive groups Cl in the macromolecule=59.5.

[0065] B. (Pd-Ag)-polymer / Al 2 o 3 Precursor preparation

[0066] Weigh 1.65gPd(NO 3 ) 2 , 0.8gAgNO 3 , measure 0.5ml o...

Embodiment 2

[0083] Catalyst preparation:

[0084] A. Functionalized polystyrene acrylonitrile (SAN) / Al 2 o 3 preparation of

[0085] Weigh Φ2.5mm, the specific surface area is 50m 2 / g, the pore volume is 0.38ml / g 3 spherical Al 2 o 3 Carrier 250g.

[0086] Weigh 1.1g of SAN resin, dissolve it in 300ml of dimethylformamide (DMF) solvent, stir at room temperature to completely dissolve the SAN resin, add the above-mentioned weighed carrier in this solution, let it stand for 60min after fully stirring, and separate the solvent After drying, SAN / Al 2 o 3 .

[0087] The above obtained SAN / Al 2 o 3 , added to 500ml of deionized water, 28.8g of ethylenediamine was added, refluxed for 300min, the product was taken out after cooling, washed until neutral, and dried to obtain functionalized SAN / Al 2 o 3 . In terms of moles, the number of moles of complexing agent ethylenediamine / the number of moles of reactive groups CN in the macromolecule=23.96.

[0088] B. (Pd-Ag) polymer polymer...

Embodiment 3

[0106] Catalyst preparation:

[0107] A. Preparation of functionalized polyvinyl chloride (PVC)

[0108] Weigh 5g of PVC and completely dissolve it in 400ml of THF, add 40g of dicyandiamide, reflux for 120min, cool to room temperature, and obtain functionalized PVC for later use after washing. In terms of moles, the number of moles of complexing agent dicyandiamide / the number of moles of reactive Cl groups in the macromolecule=5.94.

[0109] B. (Pd-Ag)-polymer complex / Al 2 o 3 Precursor preparation

[0110] Weigh Φ4.5mm, length is 4.5mm, specific surface area is 15m 2 / g, the pore volume is 0.3ml / g 3 Columnar Al 2 o 3 Carrier 250g.

[0111] Weigh 1.75gPd(NO 3 ) 2 , 0.24gAgNO 3 , Measure 6ml of nitric acid, add to the above functionalized PVC solution, stir for 5min to obtain (Pd-Ag)-PVC.

[0112] 250g Al 2 o 3 The carrier was added into the mixed solution, and after being fully stirred and allowed to stand for 1 h, the above product was washed with deionized wate...

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Abstract

The invention relates to a selective hydrogenation method for a C3 fraction. The method is characterized in that: an adiabatic bed reactor is provided with a Pd-Ag catalyst, the Pd-Ag catalyst contains Al2O3 used as a carrier, 0.2-0.4% of Pd and preferable 0.05-0.2% of Ag based on 100wt% of the catalyst, the specific surface area of the catalyst is 15-100 m<2> / g, the pore volume of the catalyst is 0.3-0.6 mL / g, and the catalyst forms an organic polymer metal complex during preparation process; and the hydrogenation process conditions are as follows: the inlet temperature of the fixed bed reactor is 10-50 DEG C, the reaction pressure is 2.5-3.5 MPa, the liquid phase volume space velocity is 5-100 h<-1> and the mol ratio of hydrogen to propyne and propadiene is (1-5):1. The selective hydrogenation method provided by the invention improves the hydrogenation activity and selectivity, greatly broadens the reaction space velocity range, greatly improves the running safety and efficiency of an apparatus and greatly improves economical benefits of 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 three fractions to remove acetylene. Background technique [0002] The acquisition of high-purity propylene is the prerequisite for the production of polypropylene, and the key to the production of high-purity propylene is to remove propyne (MA) and propadiene (PD) in the C3 fraction, generally by selective hydrogenation. [0003] The current hydrogenation process mainly adopts liquid-phase hydrogenation. Since propyne and propadiene (MA+PD) in the carbon three components have a strong tendency to polymerize, it is easy to form coke on the surface of the catalyst. As a result, the activity of the catalyst is reduced, the quality of the hydrogenation product is unqualified, and the operating life of the catalyst is shortened. [0004] In the hydrogenation process of C3 fraction without prehydrogenation, that is, in the sequenti...

Claims

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Application Information

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IPC IPC(8): C07C11/06C07C7/167C07C7/163B01J23/50
CPCY02P20/52
Inventor 谭都平梁琨车春霞常晓昕周爱文梁玉龙高源吴江张峰刘其武
Owner PETROCHINA CO LTD
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