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A kind of selective hydrogenation method

A selective hydrogenation catalyst technology, applied in the direction of selective hydrogenation refining, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of catalyst activity decline and other problems

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 kind of selective hydrogenation method
  • A kind of selective hydrogenation method
  • A kind of selective hydrogenation method

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 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, which adopts a fixed-bed reactor. The reactor is equipped with a Pd-Ag series hydrogenation catalyst. The cracked gasoline and hydrogen are mixed and preheated before entering the reactor. The hydrogenation process conditions are: reaction Temperature 30~120℃, reaction pressure 2~6MPa, space speed 0.5~4h ‑1 , the volume ratio of hydrogen to oil is 100~600:1; part of the hydrogenation product is used as an internal cycle of the first-stage hydrogenation reaction, and the other part is sent to the second-stage hydrogenation reactor for hydrogenation and refining. The catalyst prepared by using the nickel-containing alumina carrier with a specific crystal form prepared by the present invention can greatly improve the dispersion and utilization rate of active metals. At the same time, the addition of selected co-active components has a synergistic effect and improves the performance of the catalyst. Hydrogenation performance and selectivity.

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 Patents(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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