Recycle-cracking hydrocracking process
A hydrocracking and process technology, applied in hydrotreating process, petroleum industry, treatment of hydrocarbon oil, etc., can solve the problems of reducing the severity of the reaction, lowering the operating cost, and being unable to make full use of it, so as to improve the reaction activity and increase the yield. The effect of strong adaptability of raw oil and raw oil
Inactive Publication Date: 2005-05-18
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
Although the process uses a special hydrogen stripping separator containing a hydrogenation zone, the recycled unconverted material is cleaner, and the severity of the reaction is reduced, such as the pressure can be reduced by about 10%, but it still belongs to high-pressure hydrogenation , the operating cost will not be significantly reduced, and the existing equipment and processes cannot be fully utilized, which increases the cost of equipment transformation
In addition, the single-pass conversion rate of this process is relatively low, generally at 15-45wt%, mainly at 10-40wt%
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment
[0028] This process scheme deals with a heavy distillate oil: 90% heavy vacuum distillate oil VGO blended with 10% coking wax oil CGO. The main properties of this petroleum hydrocarbon material are: specific gravity 0.9045cm 3 / g, distillation range 350℃-565℃, carbon residue 0.40m%, sulfur 2.06m%, nitrogen 2226μg / g.
[0029] The operating conditions of this process scheme: reaction pressure 15MPa, hydrogen-oil ratio 1200, adopting a partial cycle operation mode> 350°C, and controlling a single-pass conversion rate of 70 wt%. The medium oil selectivity is calculated by dividing the yield of the middle distillate (jet fuel and / or diesel fraction) by the converted liquid yield (100 minus the tail oil).
[0030] The hydrofining catalyst is 3936 catalyst, and the operating temperature is 370°C.
[0031] Hydrocracking catalyst A: a hydrocracking catalyst containing beta zeolite
[0032] Weigh a kind of macroporous acidic amorphous silicon aluminum (specific surface 520m 2 / g, SiO 2 35wt...
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Abstract
The present invention relates to a reverse hydrocracking process with dual cracking agents for cyclic cracking, which is characterized in that it adopts the process of first cracking and then refining, and the unconverted oil is circulated to the second cracking section and contacted with the second hydrocracking catalyst for cyclic cracking. The first stage of stage hydrocracking adopts β zeolite hydrocracking catalyst, and the second stage adopts Y zeolite hydrocracking catalyst. On the one hand, the process of the present invention makes full use of the dual functions of the hydrocracking catalyst, and in addition, through the combined use of different types of hydrocracking catalysts, the process of the present invention has high overall activity, high selectivity for medium oil, good product quality, and low operating cost. advantage. The process of the invention mainly processes heavy petroleum hydrocarbon raw materials to produce high-quality middle distillates.
Description
Technical field [0001] The invention relates to a hydrocracking process, in particular to a cyclic cracking hydrocracking process for processing heavy petroleum hydrocarbon raw materials to produce middle distillate oil. Background technique [0002] The hydrocracking process can generally be divided into one-stage method and two-stage method. The operation mode can be divided into full cycle and one-pass. There are special catalysts for specific processes and operation methods. Precious metal hydrocracking catalysts are generally used in two-stage processes because they are sensitive to sulfur and nitrogen in the feedstock; non-precious metal hydrocracking catalysts can be widely used in one-stage processes or single-stage processes in addition to the two-stage process. . According to the characteristics of the acidic cracking center of the catalyst or the difference in the resistance to nitrogen poisoning, it can be divided into one-stage series or single-stage single-agent pro...
Claims
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IPC IPC(8): C10G65/12
Inventor 陈松王继锋谷明镝关明华
Owner CHINA PETROLEUM & CHEM CORP