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Method for preparing high-quality diesel by extract oil hydrogenation

A high-quality, oil-extraction technology, which is applied in the fields of hydroprocessing, petroleum industry, and hydrocarbon oil treatment, can solve the problems of low cetane number of diesel oil, large hydrogenation scale, and unsatisfactory stability.

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

AI Technical Summary

Problems solved by technology

Under the new standard, the existing catalytic diesel oil processing method through cutting 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 by extract oil hydrogenation
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  • Method for preparing high-quality diesel by extract oil hydrogenation

Examples

Experimental program
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Embodiment 1

[0046] Such as figure 1 Shown is a schematic flow diagram of an embodiment of the present invention, and some auxiliary equipment such as tanks, pumps, heat exchangers, condensers, etc. are not marked in the figure, but this is well known to those of ordinary skill in the art.

[0047] Such as figure 1 As shown, the distillation range is 160-365°C, the sulfur content is 4000ppm, and the density is 815.2kg / m 3 , the aromatics content is 22%, and the straight-run diesel oil of cetane number 49 (see Table 1-1 for raw material properties) is fed into extraction tower 1 with the flow rate of 100 tons / hour and solvent with the flow rate of 360 tons / hour and carries out extraction Extraction, the temperature of extraction tower 1 is 175 ℃, and pressure is 0.8MPa, and solvent ratio is 6, and solvent used is sulfolane, and the distillation range of gained raffinate is 160-341 ℃, and sulfur content is 585.4ppm, and density is 801.4kg / m 3 , the content of aromatics is 6.7%, the cetan...

Embodiment 2

[0049] Such as figure 1 Shown is a schematic flow diagram of an embodiment of the present invention, and some auxiliary equipment such as tanks, pumps, heat exchangers, condensers, etc. are not marked in the figure, but this is well known to those of ordinary skill in the art.

[0050] Such as figure 1 As shown, the distillation range is 160-365°C, the sulfur content is 2900ppm, and the density is 843.8kg / m 3 , the aromatics content is 52%, the catalytic diesel oil of cetane number 30 (see Table 2-1 for raw material properties) is fed into extraction tower 1 with the flow rate of 100 tons / hour and solvent with the flow rate of 920 tons / hour and carries out extraction , the temperature of extraction tower 1 is 150°C, the pressure is 0.65MPa, the solvent ratio is 4, the solvent used is N-methylpyrrolidone, the distillation range of the raffinate obtained is 160-343°C, the sulfur content is 1020.4ppm, and the density 827.2kg / m 3 , the content of aromatics is 19.1%, the cetane ...

Embodiment 3

[0052] Such as figure 2 Shown is a schematic flow diagram of an embodiment of the present invention, and some auxiliary equipment such as tanks, pumps, heat exchangers, condensers, etc. are not marked in the figure, but this is well known to those of ordinary skill in the art.

[0053] Such as figure 2 As shown, the distillation range is 160-365°C, the sulfur content is 2900ppm, and the density is 825.2kg / m 3 , the aromatics content is 24%, the mixture of straight-run diesel oil and coked diesel oil with cetane number 41 (see Table 3-1 for raw material properties) is fed together with a flow rate of 100 tons / hour and a solvent with a flow rate of 420 tons / hour. Extraction tower 1 carries out extraction, and the temperature of extraction tower 1 is 90 ℃, and pressure is 0.5MPa, and solvent ratio is 2, and used solvent is dimethyl sulfoxide, and the distillation range of gained raffinate is 160-341 ℃, sulfur The content is 440.5ppm, the density is 811.4kg / m 3 , the content ...

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Abstract

The invention relates to a method for preparing a high-quality diesel by extract oil hydrogenation, which comprises the following steps: adding raw materials to an extraction unit and isolating raffinate oil and extract oil; delivering the raffinate oil to a raffinate oil water scrubbing tower by the extraction unit and isolating diesel extract oil to an raffinate oil hydrogenation system; taking the recovered diesel as a blending diesel to be directly recovered; delivering the extract oil to a back washing tower and a water scrubbing tower and isolating mixed aromatic hydrocarbon and feeding into an extract oil cutting tower; and mixing the diesel and light aromatic hydrocarbon obtained by isolating at the side or heavy aromatic hydrocarbon obtained by isolating at the bottom and then recovering. Compared with the purified mode of the common diesel hydrogenation, the hydrogenation unit of the invention only aims at the raffinate oil or the extract oil in accordance with special requests; the invention can treat various raw materials and can isolate the aromatic hydrocarbon from the diesel, thereby improving cetane number of the diesel and reducing condensation point of the diesel; and the invention further can blend parts of or all aromatic hydrocarbon components to be delivered to the diesel under the condition of satisfying the condensation point of the diesel and content of the aromatic hydrocarbon, thereby improving diesel yield.

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 through hydrogenation of extracted oil. Background technique [0002] Catalytic cracking, catalytic cracking and heavy oil catalytic cracking technologies are the core technologies 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 called catalytic hydrocarbons, and the obtained catalytic hydrocarbons are generally The fractionation tower can fractionate dry steam, 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) are also becoming more and more stringent. Taking die...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/00
Inventor 丁冉峰
Owner BEIJING GRAND GOLDEN BRIGHT ENG & TECH