Hydrogenation, modification and pour point depression method by consideration of product quality of diesel oil

A technology for hydrotreating and improving product quality, applied in hydrotreating process, petroleum industry, processing hydrocarbon oil, etc., can solve the problem of diesel fraction freezing point, cold filter point property improvement not obvious, diesel fraction cetane number loss , limited effect and other problems, to achieve the effects of excellent selective ring opening cracking, improved low temperature fluidity, and easy operation

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, hydrofining technology mainly carries out reactions such as hydrodesulfurization, hydrodenitrogenation, and aromatic hydrocarbon saturation. This method can improve the sulfur content, nitrogen content, and oxidation stability of diesel products, but reduces the density and improves The effect of cetane number of diesel fraction is limited; hydro-upgrading technology mainly carries out hydrodesulfurization, hydrodenitrogenation, aromatics saturation, selective hydrocracking, etc. This method can effectively desulfurize, denitrify, reduce density, and improve diesel Cetane number of distillate fractions, but it does not significantly improve the properties of diesel fractions such as freezing point and cold filter point; the key to combined technologies such as hydrodecondensation and hydrofining-hydrodecondensation is to use catalysts containing type-selective molecular sieves to Paraffins are cracked into small molecular low-condensing components. By combining with hydrofining catalysts, this method completes hydrodesulfurization, hydrodenitrogenation, long-chain paraffin type-selective cracking and other reaction processes in the hydrogenation process, which can effectively reduce diesel oil. Condensation point, cold filter point, but in the process, the cetane number of the diesel fraction may lose

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  • Hydrogenation, modification and pour point depression method by consideration of product quality of diesel oil
  • Hydrogenation, modification and pour point depression method by consideration of product quality of diesel oil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054]The raw material oil A enters the hydrogenation reactor together with the hydrogen, and successively reacts with the hydrofining catalyst and the hydrogenation upgrading catalyst. The effluent after the reaction enters the high-pressure separator and the low-pressure separator without any intermediate separation, and is cooled and separated. The hydrogen-rich gas is recycled, and the liquid product enters the fractionation system to be separated into naphtha fraction and diesel fraction. The reaction conditions are shown in Table 2, and the product yield and properties are shown in Table 3.

[0055] It can be seen from Table 3 that both the freezing point and cold filtration point of diesel oil meet the requirements of -35 low-condensation diesel oil, the sulfur content is less than 10 μg / g, the freezing point is -47°C, the cold filtration point is -34°C, and the cetane number is 53.3. Compared with diesel feedstock, cetane number increased by 5.9 units.

Embodiment 2

[0057] The raw material oil A enters the hydrogenation reactor together with the hydrogen, and successively reacts with the hydrofining catalyst and the hydrogenation upgrading catalyst. The effluent after the reaction enters the high-pressure separator and the low-pressure separator without any intermediate separation, and is cooled and separated. The hydrogen-rich gas is recycled, and the liquid product enters the fractionation system to be separated into naphtha fraction and diesel fraction. The reaction conditions are shown in Table 2, and the product yield and properties are shown in Table 3.

[0058] It can be seen from Table 3 that the sulfur content of diesel oil is less than 10 μg / g, the freezing point is -27°C, the cold filter point is -10°C, and the cetane number is 57.5. Compared with diesel raw materials, the cetane number is increased by 10.1 units.

Embodiment 3

[0060] The raw material oil A enters the hydrogenation reactor together with the hydrogen, and successively reacts with the hydrofining catalyst and the hydrogenation upgrading catalyst. The effluent after the reaction enters the high-pressure separator and the low-pressure separator without any intermediate separation, and is cooled and separated. The hydrogen-rich gas is recycled, and the liquid product enters the fractionation system to be separated into naphtha fraction and diesel fraction. The reaction conditions are shown in Table 2, and the product yield and properties are shown in Table 3.

[0061] It can be seen from Table 3 that the freezing point and cold filtration point of diesel oil meet the requirements of -20 low-condensation diesel oil, the sulfur content is less than 10 μg / g, the freezing point is -36°C, the cold filtration point is -21°C, and the cetane number is 52.4. Compared with diesel feedstock, cetane number increased by 5.0 units.

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Abstract

The invention relates to a hydrogenation, modification and pour point depression method by consideration of product quality of diesel oil, which is characterized in that a mixture of a hydrocarbons raw material and hydrogen are introduced in a hydrofinishing reaction zone, and contacted with a hydrobon catalyst for hydrodesulfurization, hydrodenitrogenation and aromatics saturation reactions, the hydrofinishing reaction product is introduced in a hydrogenation modified reaction zone with any intermediate separation, and is contacted with the hydrogenation modified catalyst for the hydrogenation, modification and pour point depression reaction. According to the invention, the hydrogenation modified catalyst with hydrogenation function, selectivity ring opening function and isomerization function is selected, chemical reactions such as hydrodesulfurization, hydrodenitrogenation, aromatics saturation, annular hydrocarbons selectivity ring opening and cracking, and isomerization and chain hydrocarbon non-selectivity cracking can be realized during the process of hydrogenation modification, thereby the density is reduced, the diesel oil fraction cetane number is increased, diesel oil fraction condensation point and cold filter plugging point can be reduced, and the purpose of diesel oil low temperature fluidity improvement can be reached.

Description

technical field [0001] The invention relates to a method for hydrogenation and upgrading of low-quality diesel oil, more specifically, a method for increasing the cetane number of the diesel product while reducing the freezing point of the diesel product through hydrogenation and upgrading of the components of the low-quality diesel oil. Background technique [0002] In northern China, the climate is cold in winter, and the market has a greater demand for low-point diesel. Therefore, refineries need to produce the largest amount of low-point diesel in winter to meet market demand. [0003] On the other hand, with the increasingly stringent environmental protection legislation, countries around the world have put forward new requirements for automotive diesel standards. The new standards have put forward strict requirements for the sulfur content, aromatics content and cetane number of automotive diesel. For example, the National III diesel standard requires that the sulfur c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/12
Inventor 张毓莹蒋东红胡志海董松涛任亮
Owner CHINA PETROLEUM & CHEM CORP
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