Selective hydrogenation method for pyrolysis gasoline C8 fraction

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: 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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  • Selective hydrogenation method for pyrolysis gasoline C8 fraction
  • Selective hydrogenation method for pyrolysis gasoline C8 fraction
  • Selective hydrogenation method for pyrolysis gasoline C8 fraction

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0068] Example with the preparation of catalysts C1-C6:

[0069] Preparation of catalyst C1:

[0070] The concentration of 2L is 70g Al 2 O 3 The sodium metaaluminate solution of / L is put into the stainless steel container with the stirrer and the gas can be passed through the bottom of the tank, and then the nickel nitrate solution of a certain concentration is put into the container at the high position, and the nickel nitrate is controlled by the peristaltic pump for flow rate control. The solution was added to the sodium metaaluminate solution, and a mixed gas of carbon dioxide and air was introduced into the stainless steel container. The carbon dioxide concentration in the mixed gas was 60v%, and the flow rate was 3Nm. 3 / h, the gel formation temperature is 40°C, and the gel formation pH value is 9.2. After the gel formation is completed, stop feeding carbon dioxide, age for 45 minutes, age at 45°C, filter and separate the mother liquor, wash, and dry at 120°C for 8 h...

Embodiment 1

[0099] The catalyst 1 was loaded into a 250 mL adiabatic bed reaction device, and the reduction and activation of the catalyst was carried out first. Under the conditions of a pressure of 2.8 MPa, a bed temperature of 90 °C, and a hydrogen flow of 50 L / h, the catalyst was maintained for 10 h to complete the reduction and activation of the catalyst.

[0100] After the reduction, the pyrolysis gasoline carbon eight fraction was used as the raw material, and the method of lower feeding was adopted. The inlet temperature was 40°C, the reaction pressure was 0.5MPa, and the liquid hourly space velocity was 1.5h -1 200h under the condition of 20:1 volume ratio of hydrogen to oil, sampling and analyzing the content of styrene and phenylacetylene in the product every 24h, the average value of the analysis results is shown in Table 3.

Embodiment 2

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

[0105] After the activation, the pyrolysis gasoline carbon eight fraction is used as the raw material, and the method of lower feeding is adopted. The inlet temperature is 30°C, the reaction pressure is 0.4MPa, and the liquid hourly space velocity is 1.0h. -1 200h under the condition of 30:1 volume ratio of hydrogen to oil, sampling every 24h to analyze the content of styrene and phenylacetylene in the product, the average value of the analysis results is 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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IPC IPC(8): C10G45/40B01J23/89
CPCC10G45/40B01J23/8946C10G2300/70B01J35/613B01J35/615B01J35/635B01J35/633
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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