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Full-recycle hydro cracking process

A hydrocracking and full-cycle technology, which is applied in the fields of hydrotreating process, petroleum industry, and hydrocarbon oil treatment, can solve the problems of reducing reaction severity, reducing operating cost, and low single-pass conversion rate, etc., and achieves strong oil adaptability , Improve the effect of reactivity

Inactive Publication Date: 2005-11-16
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 mixed with 10% coker wax oil CGO, the main properties of the petroleum hydrocarbon material are: specific gravity 0.9045cm 3 / g, distillation range 350°C-565°C, carbon residue 0.40wt%, sulfur 2.06wt%, nitrogen 2226μg / g.

[0024] The operating conditions of this process scheme: reaction pressure 15MPa, hydrogen-to-oil ratio 1200, adopt >350°C full-cycle operation mode, and control single-pass conversion rate to 70wt%. Mid-oil selectivity is calculated as middle distillate (jet fuel and / or diesel fraction) yield divided by converted liquids yield (100 minus tails).

[0025] The hydrorefining catalyst is 3936 catalyst, and the operating temperature is 370°C.

[0026] Hydrocracking catalyst A:

[0027] Y zeolite type hydrocracking catalyst consists of: Y zeolite 5wt%, silicon aluminum (specific surface 520m 2 / g, SiO 2 35wt%, pore volume 1.2ml / g) 40wt%, small pore alumina (specific ...

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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 invention relates to a hydrocracking process with a full cycle operation, that is, unconverted oil is recycled back to a cracking section for hydrocracking, and is used in a hydrocracking process for producing clean fuel in a maximum amount. Background technique [0002] In general, the hydrocracking process can be divided into one-stage method and two-stage method, and the operation mode can be mainly divided into full cycle and one-pass. Specific processes and their modes of operation have matching dedicated catalysts. Precious metal hydrocracking catalysts are generally used in the two-stage process because they are sensitive to sulfur and nitrogen in the raw oil; non-precious metal hydrocracking catalysts are widely used in the one-stage process or single-stage process in addition to the two-stage process . According to the characteristics of the acidic cracking center of the catalyst or the difference in the anti-nitrogen poisoning performan...

Claims

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Application Information

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