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Medium pressure hydrocracking and catalytic cracking combined process for producing low sulfur diesel oil

A hydrocracking and catalytic cracking technology, which is applied in the fields of hydrotreating process, hydrocarbon oil cracking, petroleum industry, etc., and can solve the problems that medium-pressure hydrocracking products cannot meet the index requirements of clean fuels, etc.

Inactive Publication Date: 2004-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And medium-pressure hydrocracking products cannot meet the requirements of clean fuel indicators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The scheme of the present invention is: (1) in the hydrocracking reactor, the petroleum hydrocarbon raw material and the hydrocracking catalyst are mixed at a volume space velocity of 0.92h -1 Contact to obtain material I; (2) in the hydrorefining reactor, the cracked material I and the mixed diesel oil to be refined are mixed at a volume space velocity of 0.92h -1 Contact with the hydrotreating catalyst to obtain material II; (3) material II enters the fractionation system after passing through the gas-liquid separator to obtain converted light products including wide fraction diesel oil III and unconverted bottom oil IV; (4) unconverted bottom oil IV enters the FCC unit for catalytic cracking to obtain light products including catalytic diesel oil V; (5) catalytic diesel oil V is returned to the hydrorefining reactor for refining and re-refining.

[0027] Catalyst loading scheme: Hydrofinishing reactor is loaded with 3936 hydrofinishing catalyst. A kind of Y zeolite ...

Embodiment 2

[0033] The process is the same as in Example 1, the changes are:

[0034] The hydrocracking catalyst selects an amorphous silicon catalyst, which consists of: (a) 50wt% acidic amorphous silica-alumina; (b) 20wt% small-pore alumina; (c) 21wt% tungsten oxide; (d) 9wt% nickel oxide %. Among them, the acidic invisible silicon aluminum has the following characteristics: SiO 2 The content is 45%, the specific surface area is 480m 2 / g, pore volume 1.0ml / g, infrared acidity 0.5mmol / g. The pore volume of the above-mentioned small-pore alumina is 0.4ml / g, and the specific surface area is 240m 2 / g.

[0035] The reaction temperature in the cracking section is 410°C, the reaction pressure is 9.5MPa, the hydrogen-to-oil ratio is 1500, and the space velocity in the hydrocracking section is 0.8h -1 , the average reaction temperature of the hydrofining section is 385°C, and the space velocity of the hydrofining section is 0.8h -1 . The conversion rate per pass is 45%. The sulfur cont...

Embodiment 3

[0037] The process is the same as in Example 1, the changes are:

[0038] Catalyst composition is: Y zeolite 10wt%, silicon aluminum (specific surface 520m 2 / g, SiO 2 35wt%, pore volume 1.2ml / g) 35wt%, small pore alumina (specific surface 240m 2 / g, pore volume 0.4ml / g) 25wt%, nickel oxide 8wt%, tungsten oxide 22wt%.

[0039] Wherein the modification process of Y zeolite is as follows: with Na 2 SiO with 3.0 wt% O content 2 / Al 2 o 3 Y zeolite with a value of 5 is used as a raw material, placed in a high-temperature roasting furnace, fed with steam, and roasted for 0.8 hours at 500°C and 0.5MPa pressure of steam. followed by ion exchange method to obtain Na 2 Y zeolite having an O content of less than 0.2 wt%. The above-prepared Na 2 Y zeolite with an O content of less than 0.2 wt% is placed in a high-temperature roasting furnace, and treated with steam at 650° C. and 0.8 MPa pressure for 2 hours to obtain superhydrophobic Y zeolite. The superhydrophobic Y zeolite o...

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Abstract

A combined medium-pressure hydrocracking-catalytic cracking process for preparing low-S diesel oil from heavy hydrocarbon and providing the hydrogenating material to FCC equipment features that the raw material sequentially passes through cracking stage and refining stage and the FCC diesel oil component is returned back to hydrorefining reactor for refining it further.

Description

technical field [0001] The invention relates to a one-pass medium-pressure hydrocracking process combined with an FCC unit. While producing partially hydrocracked light oil products, the process provides hydrogenation pre-refining feed for the FCC unit and further refines the output of the FCC unit. low-quality diesel. Background technique [0002] Environmental regulations make fuel oil quality indicators increasingly stringent. Take clean diesel production standards as an example: sulfur, nitrogen content, cetane number, density, aromatics content and other indicators are becoming increasingly stringent. For example, the sulfur content of Swedish Class II diesel is required to be less than 50 μg / g and aromatics less than 10%. The United States is preparing to implement the standard of sulfur content less than 30-50μg / g in 2007. [0003] Catalytic cracking (FCC) unit is an important source of gasoline, and it is also the main source of sulfur in gasoline and diesel. Redu...

Claims

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Application Information

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IPC IPC(8): C10G47/00C10G65/12C10G69/04
Inventor 陈松谷明镝关明华王继锋
Owner CHINA PETROLEUM & CHEM CORP
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