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Preparing method of ultra low sulfur diesel fuel possessing modified color quality

A technology of ultra-low sulfur diesel oil, properties, applied in the treatment of hydrocarbon oil, petroleum industry, liquid carbon-containing fuels, etc., can solve the problem of increasing sulfur content, unable to achieve sulfur content equal to or less than 10ppm, etc.

Active Publication Date: 2006-08-30
SK INNOVATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Regarding the present invention, the inventor has carried out in-depth and thorough research on the preparation of ultra-low sulfur diesel oil, in order to avoid the problems encountered in the related prior art, and obtain the specific operating conditions required for the preparation method of ultra-low sulfur diesel oil, thereby through Solved due to the conventional two-step process (including hydrodesulfurization followed by H without separation 2 Hydrotreating under the condition of S) in the second step of hydrotreating, the recombination of sulfur causes the increase of sulfur content and cannot reach the standard of sulfur content equal to or less than 10ppm, so that the existing depth can be utilized to the maximum extent Simultaneous improvement of color properties in desulfurization equipment

Method used

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  • Preparing method of ultra low sulfur diesel fuel possessing modified color quality
  • Preparing method of ultra low sulfur diesel fuel possessing modified color quality
  • Preparing method of ultra low sulfur diesel fuel possessing modified color quality

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] image 3The sulfur content and color index of the deep HDS product are shown as a function of LHSV at a fixed temperature of 370°C. As shown in the graph, as the LHSV decreases, the sulfur content in the product decreases to equal to or less than 5 ppm, but the color properties further deteriorate.

Embodiment 2

[0057] Changes in sulfur content before and after hydrotreatment for color improvement (LHSV: 5, reaction temperature: 260° C.) were compared according to deep HDS conditions. Figure 4 Shown is the change in sulfur content as a function of LHSV of the desulfurization reaction before and after hydrotreatment at a fixed temperature (370°C). in addition, Figure 5 is shown at fixed LHSV (0.94 hr -1 ), the change of sulfur content with the reaction temperature of HDS before and after hydrotreatment.

[0058] Depend on Figure 4 It can be seen that as the LHSV decreases in HDS conditions, the sulfur content in the fluid to be fed to the hydrotreating reactor decreases. However, the sulfur content increases again during hydrotreatment. When applying hydrotreatment to improve color properties, it was confirmed that LHSV changes in HDS have little effect on the sulfur content in the final product.

[0059] according to Figure 5 , when the reaction temperature in the deep HDS c...

Embodiment 3

[0063] By observing whether any kind of sulfur compounds increase during hydrotreating, it is possible to detect whether the increase in sulfur compounds is due to measurement error or the formation of other sulfur compounds. For this purpose, sulfur species were analyzed by gas chromatography, Figure 6 Chromatograms of three samples are shown. From Figure 6 As can be seen, it is confirmed that the increase in sulfur content during hydrotreating is due to the formation of new sulfur compounds and not due to measurement errors.

[0064] The chromatogram of a sample of 360R2-1 (S: 22 ppm) desulfurized at 360°C followed by hydrotreating agrees with the chromatogram of sulfur compounds in the product desulfurized by conventional methods. Peaks C and D show the refractory sulfur compounds 4-methylthiophene (dibenzothiophene) and 4,6-dimethylthiophene.

[0065] The 385R1-1 (S: 7 ppm) sample corresponds to the feed for hydrotreatment after the desulfurization reaction at 385°C. ...

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Abstract

Disclosed herein is a two-step process for preparing ultra low sulfur diesel fuel having improved properties and sulfur content of 10ppm or less, comprising deep hydrodesulfurization followed by hydrotreatment, wherein the recombination of sulfur causing the increase in sulfur content upon the hydrotreatment is effectively suppressed. According to the present invention, color improvement and ultra deep desulfurization effects can be simultaneously realized while maximally utilizing the already existing equipments, thus generating economic benefits.

Description

technical field [0001] The present invention relates to a method for preparing ultra-low sulfur diesel with improved color properties by a two-step hydrogen catalysis reaction. More specifically, the present invention relates to a method for preparing ultra-low-sulfur diesel oil with a sulfur content equal to or less than 10 ppm, which can effectively suppress the increase in sulfur content during hydrotreating after ultra-deep hydrodesulfurization (HDS), The color properties of the product are thereby improved. Background technique [0002] In order to prevent the pollution of the atmospheric environment and the progress of global warming, various alternative energy sources have been developed. However, in terms of vehicle fuel, it is estimated that gasoline and diesel, which have been mainly used so far, will continue to be used in the future. In addition, the demand for high-quality automotive fuel is still growing. [0003] Since 2000, desulfurization technology using...

Claims

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Application Information

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IPC IPC(8): C10G65/04
CPCC10G45/08C10G2300/202C10G2300/4006C10L1/08
Inventor 刘益相金明俊南龙沅朴哲佑柳在旭李永奎申池宣
Owner SK INNOVATION CO LTD
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