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Selective hydrogenation method

A selective, hydrogenation catalyst technology, applied in the direction of selective hydrorefining, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as catalyst activity decline

Active Publication Date: 2018-11-23
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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Examples

Experimental program
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Effect test

preparation example Construction

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

[0073] Preparation of Catalyst C1:

[0074] Concentrate 5L to 60g Al 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 48°C, the pH value of the gelling is 9.3, after the gelling is completed, stop feeding carbon dioxide, age for 60 minutes, and the aging temperature is 50°C, filter and separate the mother liquor, wash, and dry at 120°C for 8 hours to obtain nickel-c...

Embodiment 1

[0103] Put the catalyst 1 into a 250mL adiabatic fixed-bed reaction device, first carry out the reduction and activation of the catalyst, and maintain it for 8 hours under the conditions of a pressure of 2.8MPa, a bed temperature of 110°C, and a hydrogen flow rate of 125L / h to complete the reduction and activation of the catalyst.

[0104] After the restore is complete, use C 6 -C 7 The distillate is used as raw material, at an inlet temperature of 40°C, a reaction pressure of 3.0MPa, 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.

Embodiment 2

[0108] Catalyst 2 was loaded into a 250mL adiabatic fixed-bed reactor, and the catalyst reduction and activation treatment method was the same as in Example 1.

[0109] After the restore is complete, use C 6 -C 7 The distillate is used as raw material, at an inlet temperature of 50°C, a reaction pressure of 3.5MPa, and a liquid hourly space velocity of 2.0h -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.

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Abstract

The invention provides a selective hydrogenation method. According to the selective hydrogenation method, a fixed bed reactor is utilized, a Pd-Ag series hydrogenation catalyst is put into the reactor, and pyrolysis gasoline and hydrogen enter the reactor after being mixed and preheated; the hydrogenation technological conditions are that a reaction temperature is 30 to 120 DEG C, reaction pressure is 2 to 6MPa, a space velocity is 0.5 to 4h<-1>, and a volume ration of hydrogen to oil is (100 to 600) to 1; one part of a hydrogenated product serve as internal circulation of a one-stage hydrogenation reaction, and the other part of the hydrogenated product is sent into a two-stage hydrogenation reactor to be hydrogenated and refined. By means of the catalyst which is prepared from the specific crystal form nickel-containing aluminum oxide carrier prepared by the selective hydrogenation method disclosed by the invention, dispersity and a utilization rate of reactive metal are greatly improved; meanwhile, selected activity assisting ingredients are added to achieve a synergistic effect, and hydrogenation performance and selectivity of the catalyst are improved.

Description

technical field [0001] The present invention relates to a selective hydrogenation method, in particular to a Pd-Ag based hydrogenation catalyst selective hydrogenation method, the present invention is especially suitable for pyrolysis gasoline C 5 -C 8 、C 6 -C 7 、C 6 -C 8 One-stage selective hydrogenation of the distillate. 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 significantly Reducing the selectivity of the extr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G45/40B01J23/89
CPCC10G45/40B01J23/002B01J23/8946B01J2523/00B01J35/613B01J35/615B01J35/635B01J35/633B01J2523/18B01J2523/824B01J2523/847B01J2523/13B01J2523/22B01J2523/3712B01J2523/23B01J2523/11B01J2523/3706
Inventor 马好文胡晓丽孙利民展学成王斌郑云弟钱颖梁顺琴南洋常晓昕王书峰蒋彩兰潘曦竹李平智谢培思
Owner PETROCHINA CO LTD
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