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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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

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  • Method for widening catalytic reforming feedstock

Examples

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Example Embodiment

[0038] Example 1

[0039] A kind of FCC stabilized gasoline and a kind of straight-run naphtha are 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. The mixed naphtha C and the hydrogenation catalyst DN3110 were contacted in the reactor to carry out the hydrogenation reaction. Two reactors were used, and the catalyst loading ratio was 50:50, and no quenching hydrogen was injected between the reactors. The reaction conditions were as follows: the reaction pressure was 2.5MPa (g), the inlet temperature of the first reactor was 280°C, and the volume space velocity (LHSV) was 2.5h. -1 , the volume ratio of hydrogen oil is 250Nm 3 / m 3 . The reaction product is subjected to stripping and fractional distillation to obtain refined naphtha. The operating conditions and product properties are shown in Table 3.

[0040] As ...

Example Embodiment

[0041] Example 2

[0042] The same FCC stabilized gasoline and straight-run naphtha in Example 1 were mixed at a ratio of 50:50 (wt %) to obtain mixed naphtha B, the properties of which are shown in Table 2. Mixed naphtha B and hydrogenation catalyst DN3110 were contacted in the reactor to carry out 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 FCC stabilized gasoline blended reaches 50wt%, the mixed oil has high sulfur, nitrogen and olefin content, nitrogen content reaches 27μg / g, and bromine value is 28gBr / 100g. Under the existing reaction conditions, the hydrogen partial pressure can no longer meet the requirements of denitrification, and the nitrogen content of the hydrogenation product exceeds the standard. At the same time, the olefin content in the feed oil is high, and the temperature rise of the p...

Example Embodiment

[0044] Example 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 were as follows: the reaction pressure was 3.6MPa (g), the inlet temperature of the first reactor was 280°C, and the volumetric space velocity (LHSV) was 2.6h. -1 , the volume ratio of hydrogen oil is 300Nm 3 / m 3 . The operating conditions and product properties are shown in Table 3.

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

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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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