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System for producing diesel of high quality and method thereof

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

Active Publication Date: 2011-04-20
BEIJING GRAND GOLDEN BRIGHT ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • System for producing diesel of high quality and method thereof
  • System for producing diesel of high quality and method thereof
  • System for producing diesel of high quality and method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0050] 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.

[0051] Such as figure 1 As shown, the distillation range is 160-425 ° C, the sulfur content is 5000ppm, the density is 874.1kg / m3, the aromatics content is 29%, and the mixture of straight-run diesel oil and residual oil with a cetane number of 43 (the properties of the raw materials are shown in the table 1-1) The flow rate of 100 tons / hour and the solvent are added to the extraction tower 1 at a flow rate of 540 tons / hour for extraction. The temperature of the extraction tower 1 is 175 ° C, the pressure is 0.8 MPa, and the solvent ratio is 6. The solvent used is sulfolane, the obtained raffinate has a distillation range of 160-398°C, a sulfur content of 1333ppm, and a density of 853.2kg / m 3 , the c...

Embodiment 2

[0054] 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.

[0055] Such as figure 1 As shown, the distillation range is 160-425°C, the sulfur content is 2000ppm, and the density is 879.2kg / m 3 , the aromatics content is 50%, the mixture of straight-run diesel oil and residual oil with a cetane number of 32 (see Table 1-2 for the properties of the raw material) is added together with a flow rate of 100 tons / hour and a solvent with a flow rate of 864 tons / hour. Extraction tower 1 carries out extraction, and the temperature of extraction tower 1 is 150 ℃, and pressure is 0.65MPa, and solvent ratio is 5, and solvent used is N-methylpyrrolidone, and the distillation range of gained raffinate is 160-399 ℃, sulfur The content is 667ppm, the density is 855.6kg / m 3 ,...

Embodiment 3

[0059] 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.

[0060] Such as figure 2 As shown, the distillation range is 160-395°C, the sulfur content is 4000ppm, and the density is 857.6kg / m 3 , the aromatics content is 38%, the mixture of straight-run diesel oil and residual oil with a cetane number of 38 (see Table 1-3 for raw material properties) is added together with a flow rate of 100 tons / hour and a solvent with a flow rate of 600 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 160-365 ℃, sulfur The content is 1000ppm, the density is 846.2kg / m 3, the content...

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Abstract

The present invention relates to a system for producing diesel of high quality and method thereof. The system comprises an extraction unit. The system is characterized in that the top of the extraction unit is connected with a raffinate-oil washing tower via pipes, the top of the raffinate-oil washing tower is connected with a hydrogenation reaction system via pipes, products are extracted from the bottom of the hydrogenation reaction system via pipes, the bottom of the extraction unit is connected with a return washing tower via pipes, the top of the return washing tower is connected with an extract-oil washing tower via pipes, the bottom of the return washing tower is connected with a recovery tower, the top of the extract-oil washing tower is connected with a extract-oil cutting tower via pipes, the top of the extract-oil cutting tower is connected respectively with the bottom of the extraction unit and connected with the bottom of the return tower via pipes, light aromatic hydrocarbon products are directly extracted out from the side lines of the extract-oil cutting tower via pipes, heavy aromatic hydrocarbon products are directly extracted out from the bottom of the extract-oil cutting tower via pipes, the top of the recovery tower is connected respectively with the bottom of the extraction unit and the bottom of the return tower, and the bottom of the recovery tower is connected with the top of the extraction unit via pipes. The hydrogenation unit is only applied to raffinate oil and extract oil with special requirements, so that the scale is small and the cost is low. Moreover, the diversification of raw materials processed by the system is obvious. Not only can straight-run diesel oil can be processed, but also the catalyzed diesel oil and the coking diesel oil can be processed. In addition, the invention separates aromatic hydrocarbon from diesel oil, therefore the cetane number of the diesel oil is improved greatly.

Description

technical field [0001] The invention relates to a diesel oil preparation system and a method thereof, in particular to a system and a method for preparing high-quality diesel oil by catalyzing hydrocarbon recombination. 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 Cutting tower fractionation 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...

Claims

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Application Information

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IPC IPC(8): C10G67/00
Inventor 丁冉峰
Owner BEIJING GRAND GOLDEN BRIGHT ENG & TECH
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