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Pour-point depressing method for increasing diesel product yield and quality

A diesel and product technology, applied in the field of hydrorefining diesel, can solve the problems of long process flow and so on

Active Publication Date: 2007-06-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process can reduce the gas yield to a certain extent and increase the yield of the target product, the whole process is long and requires two types of catalysts, and the superimposed products need to be post-refined

Method used

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  • Pour-point depressing method for increasing diesel product yield and quality

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Embodiment 1

[0036] Taking a catalytic diesel oil as a raw material, the method disclosed in the present invention is used to depressurize and desulfurize it. First, the raw material is cut into light and heavy components according to the cutting point of 305°C, and then the heavy components are subjected to pour point reduction, and finally the light components and the heavy components after pour point reduction are subjected to hydrorefining.

[0037] The parameters of the pour point reduction process are: the partial pressure of the reaction hydrogen is 6.4MPa, the heavy diesel oil (accounting for 40% of the weight of the catalytic diesel raw material), the hydrogen oil ratio at the inlet of the pour point reduction reactor is 600Nm 3 / m 3 , volume airspeed 1.1h -1 , the average reaction temperature is 360 ℃; the product stream from the pour point depressurization reactor and the light diesel oil fraction are mixed into the hydrotreating reactor, the partial pressure of reaction hydrog...

Embodiment 2

[0039] A mixed oil of catalytic diesel oil and heavy straight-run diesel oil (the mixing ratio is 100:10) is used as the raw material, and the method disclosed in the present invention is used for pour point depressurization and desulfurization. First, the raw material is cut into light and heavy components according to the real boiling point distillation range of 300 ° C, and then the heavy components are depressurized, and finally the light components and the heavy components after the depressurization are subjected to hydrorefining.

[0040] The process parameters are: reaction hydrogen partial pressure 6.4MPa, heavy diesel oil (accounting for 50% of the raw material weight), the hydrogen-oil ratio at the inlet of the pour point depressurization reactor is 600Nm 3 / m 3 , volume airspeed 1.0h -1 , the average reaction temperature is 365 ℃; the product stream from the pour point depressurization reactor and the light diesel oil fraction are mixed into the hydrofinishing reac...

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Abstract

This invention relates to a method for reducing the pour point for increasing the yield of products and quality of diesel oil, first of all, a diesel oil raw material is cut into light and heavy components, then the heavy one is hydrofined and hydrodewaxed orderly, finally, the light one and the hydrodewaxed heavy one are hydrofined again, which can produce low-freezing and low sulphur diesel oil of over 90%(weight).

Description

technical field [0001] The present invention relates to a method for hydrorefining hydrocarbon oil, and more particularly, the present invention relates to a method for hydrorefining diesel oil. Background technique [0002] At present, the demand for high-quality middle distillates, especially high-quality diesel, in domestic and foreign markets continues to grow, and the growth rate of its demand exceeds that of gasoline. On the other hand, with the increasingly stringent environmental protection requirements around the world, various petroleum products, including diesel, are facing an urgent situation of upgrading product quality. For diesel products, the new specifications call for lower sulfur and aromatics content and higher cetane numbers. The demand for high-quality low-condensation diesel in the northern market of my country has increased by a large amount in winter. In recent years, my country's domestic low-sulfur and low-condensation veh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G65/04
Inventor 高晓冬蒋东红熊震霖黄卫国龙湘云
Owner CHINA PETROLEUM & CHEM CORP