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Selective hydrogenation method of C3 fractions

A selective hydrogenation and fractionation technology, applied in hydrocarbons, chemical instruments and methods, hydrogenation hydrocarbon production, etc., can solve problems such as increasing the difficulty of operation, achieve selectivity improvement, improve economic benefits, and reduce the risk of overheating Effect

Active Publication Date: 2013-09-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method also increases the difficulty of operation

Method used

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Experimental program
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Effect test

Embodiment 1

[0043] Catalyst preparation: Weigh the average particle size of Φ2.5mm and the specific surface area of ​​100m 2 / g, the pore volume is 0.6ml / g, the bulk density is 0.6g / cm 3 spherical Al 2 o 3 Carrier 500g, then weighed 2.49gPd(NO 3 ) 2 2H 2 O, 15.10g Mg(NO 3 ) 2 ·6H 2 O, and 41.76g of hexamethylenetetramine were dissolved in deionized water to prepare a mixed solution, and the volume of the solution was 240ml. Spherical Al 2 o 3 Put the carrier into the mixed solution to make the solution completely absorbed, then move it into a container, react at 120°C for 12 hours, take out the solid particles after cooling down, wash thoroughly with deionized water, and dry at 120°C to obtain PdMgAl-CO 3 -LDHs / Al 2 o 3 Precursor.

[0044] Weigh 5.52g AgNO 3 and 10.6g NaSCN to prepare Ag(CNS) 2 - The complex ion solution has a volume of 330ml, and the pH value is adjusted to 4.5 with dilute nitric acid. PdMgAl-CO 3 -LDHs / Al 2 o 3 Put the precursor into the above-mentio...

Embodiment 2

[0059] The spherical shape with an average particle size of Φ3.5mm is used as the carrier, and the specific surface area is 15m 2 / g, the pore volume is 0.4g, and the bulk density is 0.9g / cm 3spherical Al 2 o 3 Carrier 500g.

[0060] Then weigh 6.23g Pd(NO 3 ) 2 2H 2 O, 45g Mg(NO 3 ) 2 ·6H 2 O and 10.5g urea are dissolved in deionized water to prepare a mixed solution, and the volume of the solution is 200ml. Spherical Al 2 o 3 Put the carrier into the mixed solution to make the solution completely absorbed, then move it into a container, react at 200°C for 5 hours, take out the solid particles after cooling down, wash thoroughly with deionized water, and dry at 120°C to obtain PdMgAl-CO 3 -LDHs / Al 2 o 3 Precursor.

[0061] Weigh 1.57g AgNO 3 and 1.74g Na 2 S 2 SO 3 , to prepare Ag(S 2 SO 3 ) complex ion solution, its volume is 180ml, and the pH value is adjusted to 6 with dilute nitric acid. PdMgAl-CO 3 -LDHs / Al 2 o 3 Put the precursor into the above-m...

Embodiment 3

[0079] Weigh 500g of a clover-shaped carrier, the length of the carrier is 5-10mm, and the specific surface area is 50.3m 2 / g, the pore volume is 0.45ml / g, the bulk density is 0.75g / cm 3 . The carrier contains Al 2 o 3 450g,TiO 2 50g.

[0080] Then weigh 2.9g PdCl 2 , 40.9g MgCl 2 ·6H 2 O and 19.04g urea, be dissolved in deionized water and be mixed with mixed solution, the volume of solution is 220ml (270ml). Spherical Al 2 o 3 Put the carrier into the mixed solution to absorb the solution, then move it into a container, react at 80°C for 24 hours, take out the solid particles after cooling down, wash thoroughly with deionized water, and dry at 120°C to obtain PdMgAl-CO 3 -LDHs / Al 2 o 3 -TiO 2 Precursor.

[0081] Weigh 10.99g AgNO 3 and 1.74g Na 2 S 2 SO 3 , was dissolved in deionized water to prepare a mixed solution, the volume of the solution was 225ml, and the pH of the solution was adjusted to 3 with dilute nitric acid. Put the carrier into the mixed ...

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Abstract

The invention relates to a selective hydrogenation method of C3 fractions. Hydrogenation materials are from the tower top of a sequence process depropanizing tower or a C2 front-end hydrogenation reactor and enter a fixed adiabatic bed reactor for liquid phase hydrogenation to remove alkynes and alkadiene. The method is characterized in that the inlet temperature of a reactor is 10-50 DEG C, the reaction pressure is 2.5-3.5 MPa, the liquid hourly space velocity is 10-100h<-1>, and the molar ratio of hydrogen / MA PD is 1-4:1; a catalyst is loaded on Al2O3, and 100% of catalyst by weight comprises 0.2-0.5% of Pd and 0.2-1.4% of Ag, and the total metal dispersion of the Pd and the Ag in the catalyst is 30-70%. The catalyst is preferentially prepared by in situ synthesizing LDHs containing Pd, Ag and Al as a catalyst precursor in the pores of Al2O3. The method can improve hydrogenation selectivity and reduce the risk of temperature runaway of the catalytic reactor, and improves the safety of device operation.

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. The main reason is that the catalyst is severely coked during gas-phase hydrogenation, which leads to short service life of the catalyst. Liquid-phase hydrogenation can better solve this problem. However, when the selectivity of the catalyst is not ideal, due to the high heat of reaction, excessive hydrogenation is prone to cause the catalytic reactor to overheat, which poses a threat to the safe operation of the device, and b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C7/163C07C7/167C07C5/09C07C5/05B01J23/50B01J37/00
CPCY02P20/52
Inventor 谭都平李殿卿景喜林车春霞梁琨赵育榕常晓昕刘兰华
Owner PETROCHINA CO LTD