Unlock instant, AI-driven research and patent intelligence for your innovation.

Catalyst for selective hydrogenation of cracked gasoline and preparation and application thereof

A technology for pyrolysis gasoline and selective hydrogenation, which is applied to the C5-C9 fraction of pyrolysis gasoline, the preparation of the catalyst, and the field of catalysts for selective hydrogenation of C8-C9 heavy fractions, which can solve the problems of selectivity, low-temperature activity and selectivity. Improvement, low temperature activity needs to be improved, etc.

Active Publication Date: 2012-07-04
CHINA PETROLEUM & CHEM CORP +1
View PDF7 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low-temperature activity and selectivity of the catalyst need to be improved
[0006] Chinese patent application publication CN1361231A discloses a catalyst for selective hydrogenation of diolefins, the carrier is an aluminum-titanium composite oxide carrier prepared by chemical co-precipitation method, wherein the weight percentage content of alumina is 1-99%, and the carrier The pore size distribution has double peaks at 50nm and 1000nm. It supports Pd active components and optional IB and / or IA or IIA group metals. It has the advantages of high activity, high selectivity, strong resistance to sulfur and arsenic, but its low temperature Activity still needs to be improved
However, its selectivity still needs to be improved

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Catalyst for selective hydrogenation of cracked gasoline and preparation and application thereof
  • Catalyst for selective hydrogenation of cracked gasoline and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] step 1

[0060] (1) Using TiCl 4 Prepare 0.25mol / L TiCl with deionized water 4 Aqueous solution (A);

[0061] (2) Using Al(NO 3 ) 3 9H 2 O crystal and deionized water prepare the aluminum nitrate aqueous solution (B) of 1.55mol / L;

[0062] (3) Using Mg(NO 3 ) 2 ·6H 2 O and deionized water prepare the magnesium nitrate aqueous solution (C) of 0.025mol / L;

[0063] (4) According to Al 2 o 3 weight of TiCl 4 with TiO 2 The content of magnesium nitrate in terms of MgO is 20% by weight and the content of magnesium nitrate in terms of MgO is 1% by weight, the solutions A, B and C are mixed to obtain a mixed solution (D) containing Mg, Ti and Al;

[0064] (5) Using the co-current co-precipitation method, in a constant temperature water bath at 40°C, 0.5mol / L (NH 4 ) 2 CO 3 Aqueous solution and prepared mixed solution (D) containing Mg, Ti and Al, wherein the rate of addition of mixed solution (D) is 60 drops / min, (NH 4 ) 2 CO 3 The rate of addition of the aqu...

Embodiment 2

[0072] Repeat the steps 1-3 of embodiment 1, difference is: in the sub-step (4) of step 1, according to based on aluminum nitrate with Al 2 o 3 weight of TiCl 4 with TiO 2 Solutions A, B, and C were mixed in an amount in which the content of magnesium nitrate was 5% by weight as MgO and the content of magnesium nitrate was 3% by weight as MgO, to obtain a mixed solution (D) containing Mg, Ti, and Al.

[0073] As a result, in the magnesia-titania-alumina composite oxide support obtained in Step 1, the content of MgO was 3% by weight based on the weight of alumina, and TiO 2 The content of is 5% by weight; and the specific surface area of ​​the carrier is 132m 2 / g, the most probable pore diameter is 18.5nm, and the pore volume is 0.5ml / g.

[0074] As a result, palladium-based catalyst B was obtained through step 3. The palladium content of palladium-based catalyst B is 0.3% by weight, the calcium content is 2.2% by weight, the yttrium content is 0.29% by weight, and the cr...

Embodiment 3

[0076] Repeat steps 1-3 of Example 1, except that the impregnating solution used in step 2 for impregnating the composite carrier is replaced with 90 ml of 3.5 mol / L (0.14 g / ml, calculated as calcium) calcium nitrate aqueous solution.

[0077] As a result, the catalyst semifinished product obtained in step 2 contained 2.2% by weight of calcium, and palladium-based catalyst C was obtained through step 3. The palladium content of the palladium-based catalyst C is 0.3% by weight, the calcium content is 2.2% by weight, and the crushing strength is 21 N / mm; in the carrier of the catalyst, the content of MgO is 1% by weight based on the weight of alumina, TiO 2 The content based on the weight of alumina is 20% by weight; and the specific surface area of ​​the support is 128m 2 / g, the most probable pore diameter is 18nm, and the pore volume is 0.52ml / g.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
pore sizeaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a catalyst for selective hydrogenation of cracked gasoline. The catalyst comprises a magnesium oxide-titanium oxide-aluminum oxide composite oxide serving as a carrier, a metal palladium active component loaded on the composite oxide carrier and an auxiliary metal of the IIA group and / or IIIB group metal, wherein the content of metal palladium is 0.25-0.35% by weight, the content of auxiliary metal is 0.2-3% by weight, and in the carrier, the content of magnesium oxide based on aluminum oxide is 0.1-3% by weight, and the content of titanium oxide is 5-20% by weight. The catalyst can be applied to the selective hydrogenation of cracked gasoline, and has high low-temperature activity, high selectivity, strong resistance against impurities of As, S, O and N, large gel capacity and stable activity in long-term operation. Moreover, the invention also relates to preparation of the catalyst and application in the selective hydrogenation of cracked gasoline. Finally, the invention also relates to a method for preparing the composite oxide carrier by a parallel-flow coprecipitation method.

Description

technical field [0001] The invention relates to a catalyst for selective hydrogenation of petroleum hydrocarbons, especially cracked gasoline C 5 -C 9 Fractions, especially C 8 -C 9 Catalysts for hydrogenation of heavy fractions. The invention also relates to the preparation method and application of the catalyst. Background technique [0002] pyrolysis gasoline C 5 -C 9 Distillate is a by-product of the ethylene industry. According to different cracking raw materials and cracking depths, its output accounts for more than 50% by weight of ethylene production capacity, and the content of aromatics accounts for 40-80% by weight, so it is the main source of aromatics. Cutting C on industrial production 8 and C 9 The distillate undergoes one-stage hydrogenation to remove highly unsaturated hydrocarbons, such as chain conjugated dienes, styrene, alkynes and cyclic conjugated dienes, and then undergoes two-stage hydrodesulfurization to remove monoenes, sulfur, and nitrogen...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/02B01J32/00B01J23/63B01J23/58C10G45/40
Inventor 纪玉国柴忠义季静任玉梅杜周
Owner CHINA PETROLEUM & CHEM CORP