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Method for widening catalytic reforming feedstock

A catalytic reforming and raw material technology, which is applied in the petroleum industry, hydroprocessing process, and hydrocarbon oil treatment, can solve the problems of unqualified nitrogen content in refined oil, affecting the processing capacity of the device, and unqualified sulfur content in products, etc. source, reduce pressure drop, and prevent channeling

Active Publication Date: 2011-05-04
PETROCHINA CO LTD +1
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  • Abstract
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Problems solved by technology

The problems existing in these two methods are: firstly, the FCC gasoline is cut, which increases equipment investment and energy consumption; secondly, the outlet temperature of the first stage of hydrogenation of the middle-weight gasoline fraction is relatively high, and hydrogenation is prone to occur. 2 Reaction of S with alkenes to produce mercaptans
However, using straight-run naphtha as the quenching oil is prone to uneven distribution of liquid in the bed, resulting in channel flow, and simultaneously using the outlet temperature of the second-stage reaction to control the feed rate of straight-run naphtha, which affects the processing capacity of the device; Third, there is no quenching measure in the hydrogenation reaction of medium gasoline fraction and straight-run naphtha, and it is not suitable for blending a large proportion of medium gasoline fraction, otherwise the bed outlet temperature will be too high and the sulfur content of the product will be unqualified
[0008] Zhang Dajin (Petroleum Refining and Chemical Industry, 2004, 35(11), P48-51) introduced the industrial application of straight-run gasoline blended with catalytic gasoline to produce reforming raw materials. Due to the limitation of pretreatment process conditions, the proportion of catalytic gasoline blended is the largest It can only reach 18wt%, and the nitrogen content of refined oil exceeding this ratio is unqualified

Method used

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  • Method for widening catalytic reforming feedstock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of FCC stabilized gasoline and a kind of straight-run naphtha are used as raw materials, and their properties are shown in Table 2. FCC stabilized gasoline and straight-run naphtha were mixed at a ratio of 20:80 (wt%) to obtain mixed naphtha A, whose properties are shown in Table 2. Mixed naphtha C is contacted with hydrogenation catalyst DN3110 in the reactor for hydrogenation reaction. Two reactors are used, the catalyst loading ratio is 50:50, and no quenching hydrogen is injected between the reactors. The reaction conditions are: reaction pressure 2.5MPa(g), first reactor inlet temperature 280°C, volume space velocity (LHSV) 2.5h -1 , hydrogen oil volume ratio 250Nm 3 / m 3 . The reaction product is stripped and fractionated to obtain refined naphtha. The operating conditions and product properties are shown in Table 3.

[0040] It can be seen from Table 3 that when blending low-proportion FCC-stabilized gasoline, due to the low olefin content, the temper...

Embodiment 2

[0042] The same FCC stable gasoline in Example 1 is mixed with straight-run naphtha at 50:50 (wt%) to obtain mixed naphtha B, whose properties are shown in Table 2. Mixed naphtha B was contacted with hydrogenation catalyst DN3110 in a reactor for hydrogenation reaction. The reaction conditions were the same as in Example 1, and the operating conditions and product properties were shown in Table 3.

[0043] It can be seen from Table 3 that when the proportion of blended FCC stable gasoline reaches 50wt%, the content of sulfur, nitrogen and olefins in the mixed oil is relatively high, the nitrogen content reaches 27μg / g, and the bromine value is 28gBr / 100g. Under the existing reaction conditions, the partial pressure of hydrogen can no longer meet the requirements of denitrification, and the nitrogen content of hydrogenation products exceeds the standard. At the same time, the content of olefins in the raw oil is high, and the temperature rise of the pre-hydrogenation reactor be...

Embodiment 3

[0045] The same mixed naphtha B in Example 2 was contacted with hydrogenation catalyst DN3110 in the reactor for hydrogenation reaction, the catalyst loading ratio was 40:60, and quenched hydrogen was injected between the reactors. The reaction conditions are: reaction pressure 3.6MPa(g), first reactor inlet temperature 280°C, volume space velocity (LHSV) 2.6h -1 , hydrogen oil volume ratio 300Nm 3 / m 3 . The operating conditions and product properties are shown in Table 3.

[0046] It can be seen from Table 3 that when the reaction pressure is increased to 3.6MPa(g), the catalyst loading ratio is 40:60 and cold hydrogen is injected, the sulfur and nitrogen content of the hydrogenation product meets the requirements of the reforming feed, and the secondary reaction outlet The temperature is only 319°C, and the content of impurities such as sulfur and nitrogen in the hydrogenation product meets the requirements of the reforming feed.

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Abstract

The invention relates to method for widening catalytic reforming feedstock. The comprises the following steps: mixing FCC (fluid catalytic cracking) stabilized gasoline and straight-run naphtha in a ratio of (50:50) to (70:30), filtering the obtained mixture by a feedstock filter so as to remove impurities in the mixture, and then removing the water carried in the mixed naphtha by a coalescer; mixing the mixed naphtha with hydrogen, and heating the obtained mixture to a reaction temperature by a heating furnace, then feeding the obtained mixture into a hydrogenation reactor to contact with a hydrogenation catalyst so as to be subject to olefin saturation, desulphurization and denitrification reactions; and condensating and cooling the obtained hydrogenation effluent, then separating the obtained product so as to obtain hydrogen-rich gas and hydrogenated gasoline, recycling the hydrogen-rich gas, and feeding the hydrogenated gasoline into an evaporation tower to be subject to strippingfractionation, thereby obtaining a refined naphtha meeting the reforming feeding requirements. By utilizing the method provided by the invention, the mixed naphtha containing more than 50 percent of the FCC stabilized gasoline can be subject to hydroprocessing so as to obtain the refined naphtha, wherein the content of the impurities in the refined naphtha satisfies the reforming feeding requirements, thereby solving the shortage problem of the reforming feedstock, and widening the source of the reforming feedstock.

Description

technical field [0001] The invention relates to a process for producing refined oil (reforming feed) in a hydrogen-facing environment, more specifically, a high-proportion FCC (catalytic cracking) stable gasoline mixed with straight-run naphtha for hydrogenation Process method for refining and producing reformed feedstock. Background technique [0002] With the increasingly stringent requirements of the world's environmental protection regulations, the production of environmentally friendly and clean fuels has become the main theme of the development of the oil refining industry in the 21st century. At present, my country's gasoline products are mainly FCC gasoline. FCC gasoline is the main blending component of gasoline, which has the characteristics of high sulfur and high olefins. More than 90% of the sulfur in finished gasoline comes from FCC gasoline. Therefore, improving the quality of FCC gasoline is the key to upgrading domestic gasoline quality. Catalytically refo...

Claims

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Application Information

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IPC IPC(8): C10G67/14
Inventor 邵文刘传强赵兴武李小娜朱元洪田慧谢崇亮孔飞
Owner PETROCHINA CO LTD
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