A method for selective hydrogenation of carbon eight fractions of pyrolysis gasoline

A pyrolysis gasoline, selective hydrogenation technology, applied in the direction of selective hydrofining, chemical instruments and methods, treatment of hydrocarbon oil, etc., can solve the problem of catalyst activity decline and other issues

Active Publication Date: 2021-01-01
PETROCHINA CO LTD
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  • 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 carbon eight fractions of pyrolysis gasoline
  • A method for selective hydrogenation of carbon eight fractions of pyrolysis gasoline
  • A method for selective hydrogenation of carbon eight fractions of pyrolysis gasoline

Examples

Experimental program
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Effect test

preparation example Construction

[0068] The preparation of embodiment with catalyst C1-C6:

[0069] Preparation of Catalyst C1:

[0070] Dilute 2L to a concentration of 70g 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 60v%, and the flow rate is 3Nm 3 / h, the gelling temperature is 40°C, the pH value of the gelling is 9.2, after the gelling is completed, stop feeding carbon dioxide, age for 45 minutes, and the aging temperature is 45°C, filter and separate the mother liquor, wash, and dry at 120°C for 8h to obtain...

Embodiment 1

[0099] Put catalyst 1 into a 250mL adiabatic 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 90°C, and hydrogen flow rate 50L / h to complete the reduction and activation treatment of the catalyst.

[0100] After the reduction is complete, use the C8 fraction of pyrolysis gasoline as the raw material, and adopt the method of lower feeding. -1 1. Operate for 200 hours under the condition of hydrogen oil volume ratio of 20:1, and sample and analyze the content of styrene and phenylacetylene in the product every 24 hours. The average analysis results are shown in Table 3.

Embodiment 2

[0104] Catalyst 2 was loaded into a 250mL adiabatic bed reactor, and the catalyst reduction and activation treatment method was the same as in Example 1.

[0105] After the activation is completed, use the C8 fraction of pyrolysis gasoline as the raw material, and adopt the method of lower feeding. -1 1. Operate for 200 hours under the condition of hydrogen oil volume ratio of 30:1, and sample and analyze the content of styrene and phenylacetylene in the product every 24 hours. The average analysis results are shown in Table 3.

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Abstract

The invention provides a method for selective hydrogenation for phenylacetylene removal by using a raw material of pyrolysis gasoline C8 fraction, wherein the C8 fraction is preheated and enters a fixed bed hydrogenation reactor, a lower feeding mode is adopted, and the reactor is filled with a catalyst; hydrogenation process conditions are: inlet temperature is 10-70 DEG C, space velocity is 0.1-6.0h<-1>, pressure is between 0.1 and 2.0 MPa, the volume ratio of hydrogen to fresh oil is (1-100):1, and a hydrogenation product is a raw material for extracting styrene; Pd-Mo series catalysts prepared by using a nickel-containing alumina carrier having a specific crystalline form prepared by the selective hydrogenation method for the pyrolysis gasoline C8 fraction can greatly improve the dispersion and utilization ratio of active metal, and active components are added to play synergistic effects to improve hydrogenation activity and selectivity of the catalyst.

Description

technical field [0001] The invention provides a method for selectively hydrogenating and removing phenylacetylene by using the C8 fraction of pyrolysis gasoline as a raw material; in particular, it relates to a method for selectively hydrogenating the C8 fraction of cracking gasoline with a Pd-Mo catalyst. Background technique [0002] Styrene (ST) is an important monomer for the production of polystyrene, ABS resin and styrene-butadiene rubber. It is difficult to meet the market demand for styrene by the technology of dehydrogenation of ethylbenzene alone, and the dehydrogenation of ethylbenzene exists The disadvantage of high production costs. The production of styrene from the by-product C8 fraction of cracking ethylene is becoming an attractive new way to increase the production of styrene. [0003] Pyrolysis gasoline is a by-product of the ethylene industry, and its output is about 60-70% of the ethylene production capacity. The C8 fraction is used to extract and recov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G45/40B01J23/89
CPCB01J23/8946B01J35/1014B01J35/1019B01J35/1038B01J35/1042C10G45/40C10G2300/70
Inventor 王斌胡晓丽孙利民马好文郑云弟展学成杨红强梁顺琴钱颖常晓昕潘曦竹李平智谢培思
Owner PETROCHINA CO LTD
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