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A method for selective hydrogenation of pyrolysis gasoline

A technology for pyrolysis gasoline and selective hydrogenation, which is applied in the field of pyrolysis gasoline C5-C9, C6-C9 fractions, and can solve problems such as the decrease of catalyst activity

Active Publication Date: 2021-01-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The results show that the desulfurization activity of the catalyst activated at 500 °C is significantly higher than that of the catalyst activated at 600 °C, which is due to the strong interaction between the metal in the catalyst and the alumina support to form a spinel structure when activated at 600 °C lead to a significant decrease in catalyst activity

Method used

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  • A method for selective hydrogenation of pyrolysis gasoline
  • A method for selective hydrogenation of pyrolysis gasoline
  • A method for selective hydrogenation of pyrolysis gasoline

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0072] The preparation of embodiment with catalyst C1-C6:

[0073] Preparation of Catalyst C1:

[0074] Concentrate 3L to 50gAl 2 o 3 / L of sodium metaaluminate solution is put into a stainless steel container with a stirrer and the bottom of the tank can be fed with gas, and then a certain concentration of nickel nitrate solution is put into a high-position container, and the flow rate of the nickel nitrate is controlled by a peristaltic pump. The solution is added to the sodium metaaluminate solution, and a mixed gas of carbon dioxide and air is introduced into the stainless steel container at the same time, the concentration of carbon dioxide in the mixed gas is 70v%, and the flow rate is 3Nm 3 / h, the gelling temperature is 40°C, the pH value of the gelling is 9.3, after the gelling is completed, stop feeding carbon dioxide, age for 45 minutes, the aging temperature is 45°C, filter and separate the mother liquor, wash, and dry at 120°C for 8 hours to obtain nickel-contai...

Embodiment 1

[0103] Put the catalyst 1 into a 100mL isothermal fixed-bed reaction device, first carry out the reduction and activation of the catalyst, and maintain it for 10 hours under the conditions of pressure 2.8MPa, bed temperature 80°C, and hydrogen flow rate 50L / h to complete the reduction and activation treatment of the catalyst.

[0104] After the restore is complete, use C 5 -C 9 The distillate is the raw material, at an inlet temperature of 75°C, a reaction pressure of 4.0MPa, and a liquid hourly space velocity of 3.0h -1 1. Run for 200 hours under the condition of hydrogen oil volume ratio 300:1, sample and analyze the diene value and bromine value in the product every 24 hours, and the average value of the analysis results is shown in Table 3.

Embodiment 2

[0108] Catalyst 2 was loaded into a 100 mL isothermal fixed-bed reaction device, and the catalyst reduction and activation treatment method was the same as in Example 1.

[0109] After the restore is complete, use C 5 -C 9 The distillate is used as raw material, at an inlet temperature of 70°C, a reaction pressure of 5.0MPa, and a liquid hourly space velocity of 2.0h -1 1. Operate for 200 hours under the condition of hydrogen oil volume ratio of 200:1, and sample and analyze the diene value and bromine value in the product every 24 hours. The average value of the analysis results is shown in Table 3.

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Abstract

The invention provides a selective hydrogenation method for pyrolysis gasoline, wherein an isothermal fixed bed reactor is adopted, the reactor is provided with a Pd-Mo series hydrogenation catalyst,and the hydrogenation process conditions are: reaction temperature is 50-100 DEG C, reaction pressure is 3-7 MPa, sapce velocity is 1-5h<-1>, and the volume ratio of hydrogen to oil is (100-600):1; ahydrogenation product is sent to the second-stage hydrogenation reactor for hydrorefining; Pd-Mo series hydrogenation catalysts prepared by using a nickel-containing alumina carrier having a specificcrystalline form prepared by the selective hydrogenation method for the pyrolysis gasoline can greatly improve the dispersion and utilization ratio of active metal, and active components are added toplay synergistic effects to improve hydrogenation activity and stability of the catalysts.

Description

technical field [0001] The present invention relates to a method for selective hydrogenation of pyrolysis gasoline fractions, in particular to a method for selective hydrogenation of pyrolysis gasoline with a Pd-Mo hydrogenation catalyst. The selective hydrogenation method of the present invention is especially suitable for pyrolysis gasoline C 5 -C 9 、C 6 -C 9 fraction. Background technique [0002] Pyrolysis gasoline is an important by-product of steam cracking ethylene plant, and its output is 50%-80% (mass fraction) of the ethylene production capacity. The content of aromatics is as high as 50%, and it is an important raw material for extracting aromatics. Pyrolysis gasoline also contains a large amount of unsaturated hydrocarbons (dienes, monoenes) and impurities such as sulfur and nitrogen, resulting in poor stability of pyrolysis gasoline and the formation of colloids, and these unsaturated hydrocarbons and impurities such as sulfur and nitrogen will increase signi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G45/40B01J23/89
CPCB01J23/002B01J23/8993B01J35/1014B01J35/1019B01J35/1038B01J35/1042B01J2523/00C10G45/40B01J2523/824B01J2523/847B01J2523/68B01J2523/11B01J2523/23B01J2523/3706B01J2523/3712B01J2523/13B01J2523/22
Inventor 马好文胡晓丽郑云弟王斌展学成孙利民梁顺琴钱颖常晓昕南洋潘曦竹李平智谢培思蒋彩兰尹玲玲王书峰
Owner PETROCHINA CO LTD
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