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Full-recycle hydro cracking process

A hydrocracking, full cycle technology, applied in hydrotreating process, petroleum industry, treatment of hydrocarbon oil, etc., can solve the problems of reducing the severity of the reaction, reducing the operating cost, low conversion rate per pass, etc., and achieving strong oil adaptability. , the effect of improving the reactivity

Inactive Publication Date: 2004-06-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0023] This process plan deals with a heavy distillate oil: 90% heavy vacuum distillate oil VGO blended with 10% coking wax oil CGO, the main properties of the petroleum hydrocarbon material are: specific gravity 0.9045cm 3 / g, distillation range 350℃-565℃, carbon residue 0.40wt%, sulfur 2.06wt%, nitrogen 2226μg / g.

[0024] The operating conditions of this process plan: the reaction pressure is 15MPa, the hydrogen-to-oil ratio is 1200, the full-cycle operation mode of >350°C is adopted, and the single-pass conversion rate is controlled to 70wt%. Middle oil selectivity calculations are calculated as middle distillate (jet fuel and / or diesel fractions) yield divided by converted liquid yield (100 minus tails).

[0025] The hydrotreating catalyst was 3936 catalyst, and the operating temperature was 370°C.

[0026] Hydrocracking Catalyst A:

[0027] The composition of Y zeolite hydrocracking catalyst is: Y zeolite 5wt%, silica-alumina (specific surface 520m 2 / g, SiO 2 35wt%, ...

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PUM

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Abstract

The invention relates to a full-circulation operation hydrocracking process, adopting the first-cracking after-refining flow, and circulating unconverted oil to the cracking segment for hydrocracking, applied to maximumly produce clean fuel. The hydrocracking catalyst is the combination of several different catalysts. It has advantages of high integral activity, good product quality and low operating cost.

Description

technical field [0001] The present invention relates to a hydrocracking process of full cycle operation, that is, a hydrocracking process for recirculating unconverted oil back to the cracking section for hydrocracking, which is used for producing clean fuel in maximum quantity. Background technique [0002] The hydrocracking process can be generally divided into one-stage method and two-stage method, and the operation mode can be mainly divided into full cycle and one-pass. There are special catalysts for specific processes and their operation methods. Precious metal hydrocracking catalysts are generally used in the two-stage process because they are sensitive to sulfur and nitrogen in the feed oil; non-precious metal hydrocracking catalysts are widely used in one-stage process or single-stage process in addition to the two-stage process. . According to the characteristics of the acid cracking center of the catalyst or the difference in the anti-nitrogen poisoning perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/12
Inventor 陈松关明华谷明镝王继锋
Owner CHINA PETROLEUM & CHEM CORP