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Method for preparing high-quality diesel oil by increasing cetane number through non-hydrodesulfurization

A cetane number, non-hydrogenation technology, which is applied in the field of non-hydrodesulfurization to increase the cetane number to prepare high-quality diesel oil, can solve the problems of low cetane number of diesel oil, small adjustment margin, and high operating costs. Achieve the effects of increasing cetane number, no hydrogen consumption, and easy handling

Inactive Publication Date: 2014-01-22
BEIJING GRAND GOLDEN BRIGHT ENG & TECH
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  • Claims
  • Application Information

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Problems solved by technology

Under the new standard, the existing processing method of catalyzed diesel oil through fractionation tower fractionation shows the following deficiencies: one is that the quality of diesel oil produced by this treatment method needs to be improved, the cetane number of diesel oil is low, and the stability does not meet the requirements ; Second, the scale of hydrogenation required by the above-mentioned treatment method is too large, resulting in high hydrogen consumption in the whole plant; third, the cetane number of the diesel produced is too low to meet market requirements
The cetane number of diesel oil is the core issue of diesel quality. At present, the main measures to increase the cetane number of catalytic diesel oil are high-pressure hydrogenation and high-pressure hydrogenation combination technology. Catalytic diesel oil processed by high-pressure hydrogenation and high-pressure hydrogenation combination technology The cetane number has been greatly improved, but the construction investment of this technology is huge, the operation cost is high, and it is limited by hydrogen resources.
[0004] The above measures have the following problems: ①The construction investment is huge, the operating cost is high, the scale is limited by raw materials, and there are irrational utilization of resources; ②The use of new catalysts can increase the cetane number of diesel oil, but it will lead to hydrogen consumption ③Adjust the distillation range of diesel oil and increase the cetane number of diesel oil, the adjustment margin is not large, and it will also lead to the increase of sulfur content in diesel oil

Method used

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  • Method for preparing high-quality diesel oil by increasing cetane number through non-hydrodesulfurization
  • Method for preparing high-quality diesel oil by increasing cetane number through non-hydrodesulfurization
  • Method for preparing high-quality diesel oil by increasing cetane number through non-hydrodesulfurization

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Embodiment 1

[0028] figure 1 It is a schematic flow diagram of this embodiment. Some auxiliary equipment such as separation tanks and pumps are not shown in the figure, but this is well known to those of ordinary skill in the art.

[0029] Such as figure 1 As shown, the distillation range is 160-350℃, the sulfur content is 3200ppm, and the density is 844.2kg / m 3 , The aromatic content is 12%, the cetane number is 40.0 light diesel (see Table 1-1 for raw material properties) and the solvent are added to the light diesel extraction tower at a flow rate of 20 tons / hour and 30 tons / hour respectively 1-1 for extraction. The temperature of the light diesel extraction tower 1-1 is 140°C, the pressure is 0.7 MPa, the solvent ratio is 2, the solvent used is sulfolane, the light raffinate oil is drawn at the top, and the light drawn oil is drawn at the bottom. The distillation range of the obtained light raffinate oil is 185-280℃, the sulfur content is 290ppm, and the density is 810.9kg / m 3 , The aro...

Embodiment 2

[0031] figure 1 It is a schematic flow diagram of this embodiment. Some auxiliary equipment such as separation tanks and pumps are not shown in the figure, but this is well known to those of ordinary skill in the art.

[0032] Such as figure 1 As shown, the distillation range is 163-351℃, the sulfur content is 4500ppm, and the density is 837.3kg / m 3 , The aromatic content is 15%, the cetane number is 39.6 light diesel (see Table 1-1 for raw material properties) and the solvent is added to the light diesel extraction tower at a flow rate of 25 tons / hour and a flow rate of 37.5 tons / hour respectively 1-1 for extraction. The temperature of the light diesel extraction tower 1-1 is 150°C, the pressure is 0.9 MPa, the solvent ratio is 3, the solvent used is sulfolane, the light raffinate oil is drawn at the top, and the light drawn oil is drawn at the bottom. The distillation range of the obtained light raffinate oil is 185-280℃, the sulfur content is 270ppm, and the density is 805.5...

Embodiment 3

[0034] figure 1 It is a schematic flow diagram of this embodiment. Some auxiliary equipment such as separation tanks and pumps are not shown in the figure, but this is well known to those of ordinary skill in the art.

[0035] Such as figure 1 As shown, the distillation range is 188-303℃, the sulfur content is 5000ppm, and the density is 836.5kg / m 3 , The aromatic content is 18%, the cetane number is 40.5 light diesel (see Table 3-1 for raw material properties) and the solvent are added to the light diesel extraction tower at a flow rate of 30 tons / hour and a flow rate of 45 tons / hour respectively. 1-1 for extraction. The temperature of the light diesel extraction tower 1-1 is 160°C, the pressure is 1.1 MPa, the solvent ratio is 4, the solvent used is sulfolane, the light raffinate oil is drawn at the top and the light drawn oil is drawn at the bottom. The obtained light raffinate has a distillation range of 190-275°C, a sulfur content of 340ppm, and a density of 809.5kg / m 3 , ...

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Abstract

The invention relates to a method for preparing high-quality diesel oil by increasing a cetane number through non-hydrodesulfurization. The method comprises the following steps of: mixing light straight-run diesel oil or coking diesel oil or catalytic diesel oil or a mixture of the light straight-run diesel oil, the coking diesel oil and the catalytic diesel oil in any ratio with a solvent, and adding the mixture into a light diesel oil extraction column for extracting; and mixing heavy straight-run diesel oil or heavy coking diesel oil or heavy catalytic diesel oil or a mixture of the heavy straight-run diesel oil, the heavy coking diesel and the heavy catalytic diesel in any ratio with a solvent, and introducing the mixture into a heavy diesel oil extraction column for extracting. Compared with the ordinary diesel oil hydrogen refining way, the method has the advantages of no consumption of hydrogen, diversified treated raw materials and capability of treating the straight-run diesel oil, the catalytic diesel oil and the coking diesel oil and the mixture of the straight-run diesel oil, the catalytic diesel oil and the coking diesel oil; moreover, aromatic hydrocarbon is separated out of diesel oil, so that the cetane number of diesel oil is greatly increased, and the solidifying point of diesel oil is lowered; lastly, light aromatic hydrocarbon and heavy aromatic hydrocarbon in diesel oil aromatic hydrocarbon can be separated from each other for separate treatment in a refinery.

Description

Technical field [0001] The invention relates to a method for preparing diesel oil, in particular to a method for preparing high-quality diesel oil by non-hydrodesulfurization and increasing cetane number. Background technique [0002] Catalytic cracking, catalytic cracking and heavy oil catalytic cracking technology is the core technology of oil refining. Catalytic cracking is divided into wax oil catalytic cracking and heavy oil catalytic cracking; the oil produced from these processes is collectively referred to as catalytic hydrocarbons, and the resulting catalytic hydrocarbons are processed, generally Fractionation tower fractionation can fractionate dry gas, liquefied gas, diesel, diesel, heavy oil and other products, among which diesel and diesel account for more than 70% of the total supply of diesel and diesel in the market. [0003] As environmental protection requirements become more and more stringent, the specifications of petroleum products (fuels) have become more and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/16
Inventor 丁冉峰
Owner BEIJING GRAND GOLDEN BRIGHT ENG & TECH
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