Mixed hydrogenation method for catalytic cracking gasoline and coking diesel oil

A technology for catalytically cracking gasoline and coking diesel, which is applied in hydrotreating process, petroleum industry, processing hydrocarbon oil, etc., to avoid coking, reduce octane number loss, and have a simple structure.

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] Aiming at the problem of coking in heat exchangers and heating furnaces and selective desulfurization of catalytic cracking gasoline selective hydrodesulfurization technology, the present invention provides a hybrid hydrogenation method of catalytic cracking (FCC) gasoline and coked diesel oil

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  • Mixed hydrogenation method for catalytic cracking gasoline and coking diesel oil

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Embodiment 1~3

[0027] Embodiment 1~3 adopts figure 1 The process flow shown.

[0028] The catalyst used for alkali-free deodorization of FCC gasoline is the AFS-12 prefabricated catalyst developed by China University of Petroleum. The same process conditions are used for alkali-free deodorization: reaction pressure 0.6MPa, reaction temperature 40°C, feed space velocity 0.9h -1, the air flow / feed volume ratio is 0.7.

[0029] After alkali-free deodorization, FCC gasoline is fractionated in the hydrogenation pre-fractionator, and the cutting temperature of light gasoline and heavy gasoline is 50°C. Heavy gasoline is mixed with coked diesel oil and hydrogen and enters the hydrorefining reactor for reaction. After the hydrorefining products are separated and fractionated, refined heavy gasoline and light gasoline are blended to obtain gasoline products.

[0030] The hydrodesulfurization catalyst is selected from the FGH-21 / FGH-31 combination catalyst developed by Fushun Petrochemical Researc...

Embodiment 1～3

[0033] Table 2 Hydrodesulfurization Process Conditions of Examples 1-3

[0034] Example 1 Example 2 Example 3 Raw oil FCC heavy gasoline / coking diesel 1=2 FCC heavy gasoline / coking diesel 2=3 FCC heavy gasoline / coking diesel 3=4 Feed nitrogen content, μg / g 425 473 436 Reaction temperature, °C 260 280 300 Reaction pressure, MPa 1.6 1.6 1.6 volumetric space velocity, h -1 3.0 3.0 2.5 Hydrogen oil volume ratio 300 300 300

[0035] Table 3 Properties of blended gasoline products obtained in Examples 1-3

[0036] Example 1 Example 2 Example 3 Density(20℃) / g·cm -3 0.7314 0.7312 0.7268 Distillation range (ASTM D 86), °C initial boiling point 35 35 35 10% 55 56 54 50% 98 97 98 90% 170 169 170 end point 191 190 189 Sulfur, μg / g 132 27 8 RON 94.1 93.8 92.8 RON loss 0.4 0.7 1.7 Stable operation period, h 8000 8...

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Abstract

The invention discloses a mixed hydrogenation method for catalytic cracking gasoline and coking diesel oil. The method comprises: subjecting FCC (fluid catalytic cracking) gasoline to alkali-free deodorization, making the deodorized catalytic gasoline enter a prefractionator to be fractionated into light gasoline and heavy gasoline; mixing the heavy gasoline with coking diesel oil, then performing hydrodesulfurization, separating the desulfurization product to obtain hydrogenated heavy gasoline and treated coking diesel oil, and blending the hydrogenated heavy gasoline with the light gasoline to obtain a clean gasoline product. According to the method provided in the invention, when the coking diesel oil and the heavy gasoline are mixed for hydrogenation, the nitride brought in by the coking diesel oil undergoes competitive adsorption at a catalyst hydrogenation center and causes poisoning of the hydrogenation center, thus reducing olefin hydrogenation selectivity and decreasing the octane number loss of hydrogenation. On the other hand, when the mixed feed flows through a heat exchanger and heating furnace, the raw materials are in a gas-liquid mixed phase in the heating furnace and the heat exchanger, so that a coke material can be dissolved and taken away, coking can be avoided in the heat exchanger and the heating furnace, and the operation cycle of the equipment can be prolonged.

Description

technical field [0001] The invention relates to a hybrid hydrogenation method of catalytic cracking gasoline and coking diesel oil, in particular to a combined method for improving the selectivity of catalytic gasoline hydrogenation desulfurization and prolonging the operating cycle of a hydrogenation desulfurization device and a downstream coking diesel hydrogenation device. Background technique [0002] With the development of the automobile industry and the increase in the number of automobiles, people are paying more and more attention to the pollution of the air caused by the harmful substances emitted by automobile exhaust. The specifications of gasoline used by various countries such as olefin content and sulfur content are increasing day by day. Reducing the content of sulfur and olefins in finished vehicle gasoline can effectively reduce the emission of harmful substances in vehicle exhaust. Therefore, the state has not only formulated increasingly stringent "Automo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/00
Inventor 柳伟刘继华李扬宋永一牛世坤李士才徐大海丁贺赵桂芳
Owner CHINA PETROLEUM & CHEM CORP
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