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Method for preparing high-quality diesel by raffinate oil hydrogenation

A high-quality raffinate technology, applied in hydrotreating process, petroleum industry, hydrocarbon oil treatment, etc., can solve problems such as low cetane number of diesel oil, small adjustment margin, and increased hydrogen consumption

Inactive Publication Date: 2014-03-05
BEIJING GRAND GOLDEN BRIGHT ENG & TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

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 by raffinate oil hydrogenation
  • Method for preparing high-quality diesel by raffinate oil hydrogenation
  • Method for preparing high-quality diesel by raffinate oil hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] figure 1 It is a schematic flow diagram of the present embodiment, and some auxiliary equipment such as separation tanks, pumps, etc. are not marked in the figure, but this is well known to those of ordinary skill in the art.

[0045] like figure 1 As shown, the distillation range is 160-365°C, the sulfur content is 3200ppm, and the density is 817.3kg / m 3 , the aromatics content is 202%, and the straight-run diesel oil of cetane number 50.5 (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 300 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 160~345 ℃, and sulfur content is 451.8ppm, and density is 801.4kg / m 3 , the content of aromatics is 7.5%, the cetane number is 55.7; the distillation range of t...

Embodiment 2

[0048] figure 1 It is a schematic flow diagram of the present embodiment, and some auxiliary equipment such as separation tanks, pumps, etc. are not marked in the figure, but this is well known to those of ordinary skill in the art.

[0049] like figure 1 As shown, the distillation range is 160-365°C, the sulfur content is 3400ppm, and the density is 843.8kg / m 3 , the aromatics content is 41%, the catalytic diesel oil of cetane number 36.5 (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 700 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 160~344°C, the sulfur content is 786.4ppm, and the density 827.2kg / m 3 , the content of aromatics is 13.3%, the cetane number is 47.5; the distillation range of the o...

Embodiment 3

[0051] figure 1 It is a schematic flow diagram of the present embodiment, and some auxiliary equipment such as separation tanks, pumps, etc. are not marked in the figure, but this is well known to those of ordinary skill in the art.

[0052] like figure 1 As shown, the distillation range is 160-365°C, the sulfur content is 1800ppm, and the density is 835.6kg / m 3 , the aromatics content is 33%, the mixture of straight-run diesel oil and coked diesel oil with cetane number 40 (see Table 3-1 for the properties of raw materials) is fed together with a flow rate of 100 tons / hour and a solvent with a flow rate of 500 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 160-342 ℃, sulfur The content is 360ppm, the density is 817.7kg / m 3 , the content of aromatics is 10.6%, the cetane number is ...

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Abstract

A system for producing high quality diesel comprises an extraction apparatus (1), a raffinate water washing column (2-1), a backwash column (5), an extract water washing column (2-2), a recovery column (6), an extract fractioning column (4) and a hydrogenation system (3), wherein the top of the extraction apparatus(1) is connected to the raffinate water washing column (2-1) via a pipeline, diesel is recovered from the top of the raffinate water washing column (2-1), the bottom of the extraction apparatus (1) is connected to the backwash column (5) by a pipeline, the top of the backwash column (5) is connected to the extract water washing column (2-2) via a pipeline, the bottom of the backwash column (5) is connected to the recovery column (6) via a pipeline, the top of the extract water washing column (2-2) is connected to the middle portion of the extract fraction column (4) via a pipeline, the top of the recovery column (6) is connected to the backwash column (5) and the extraction apparatus (1) respectively via pipelines, the bottom of the extract fractioning column (4) is connected to the hydrogenation system (3) via a pipeline, mixed aromatics are directly recovered from the bottom of the hydrogenation system (3), the top of the extract fractioning column (4) is connected to the recovery column (6), the lower portion of the extraction apparatus (1) and the lower portion of the backwash column (5) via pipelines respectively, and the bottom of the recovery column (6) is connected to the upper portion of the extraction apparatus (1) via a pipeline. A method for producing high quality diesel using this system is also provided.

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 raffinate 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
CPCC10L1/08C10G67/04
Inventor 丁冉峰
Owner BEIJING GRAND GOLDEN BRIGHT ENG & TECH
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