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Use of infrared spectroscopy to produce high lubricity, high stability, Fischer-Tropsch diesel fuels and blend fuel

A spectrum and gasoline technology, applied in the distillation control/regulation of hydrocarbon oil, fuel, refined hydrocarbon oil, etc., can solve problems such as fuel corrosion

Inactive Publication Date: 2001-05-02
EXXON RES & ENG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Removal of olefins and oxygenated organics is desirable because high olefin content is directly related to poor oxidation stability and carboxylic acids contribute to fuel corrosiveness

Method used

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  • Use of infrared spectroscopy to produce high lubricity, high stability, Fischer-Tropsch diesel fuels and blend fuel
  • Use of infrared spectroscopy to produce high lubricity, high stability, Fischer-Tropsch diesel fuels and blend fuel
  • Use of infrared spectroscopy to produce high lubricity, high stability, Fischer-Tropsch diesel fuels and blend fuel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Hydroisomerized Fischer-Tropsch diesel fuel with a nominal boiling range from 250-700°F was sequentially spiked with 20, 80, and 200 ppm caproic acid. Using a 1mm pathlength sample cell and a 2cm-1 The spectral resolution is measured in the mid-infrared spectrum. Adopt 1755cm -1 and 1685cm -1 The linear corrected baseline drawn between. (Other cell path lengths, spectral resolutions, and baseline correction methods may be used). The peak absorbance is taken at 1711-1715cm -1 The highest absorbance value in the range. The reported absorbance value was determined by measuring the absorbance at the peak maximum relative to the baseline absorbance value at this frequency. figure 2 Show caproic acid concentration and 1713cm -1 The linear relationship of absorbance.

Embodiment 2

[0021] The following example illustrates a pair of 1713cm -1 Absorbance is monitored to predict fuel corrosivity. Fuel corrosion is measured by the method of ASTM D130 standard copper strip test, with the following improvements: 1) the copper strip must be weighed before and after the experiment to detect the weight loss caused by the corrosion of the sample; 2) after the experiment, the used fuel is tested ICP analysis to detect dissolved (corroded) Cu in solution; 3) The test was performed at 100°C instead of 50°C. The amount of copper corroded into the solution is 1713cm -1 Infrared absorbance plot. It can be clearly seen that 1713cm -1 Absorbance at is very sensitive in predicting the onset of corrosion. If a sample cell with a 1mm optical path length is used, the production process should be adjusted to ensure that the final product is 1713cm -1 The absorbance at is less than 0.05 Å. image 3 shows the solubilized copper pair 1713cm -1 The relationship between IR a...

Embodiment 3

[0023] Hydroisomerized Fischer-Tropsch diesel fuels with nominal boiling ranges from 250-700°F were sequentially spiked with 0.02, 0.1, 0.5 and 1 wt% 1-decene. Using a 1mm pathlength sample cell and a 2cm -1 The spectral resolution is measured in the mid-infrared spectrum. Use 1658cm -1 and 1630cm -1 The linear corrected baseline drawn between. (Other cell path lengths, spectral resolutions, and baseline correction methods may be used). The peak absorbance is taken at 1640-1644cm -1 The highest absorbance value in the range. The reported absorbance value was determined by measuring the absorbance at the peak maximum relative to the baseline absorbance value at this frequency. Figure 4 shows the concentration of 1-decene with 1642cm -1 The linear relationship of absorbance.

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Abstract

The present invention is a method for controlling a process for producing a distillate fuel heavier than gasoline. The process includes several different fractions, streams, including alcohols, olefins, and acids. At least one of the streams or is irradiated with IR radiation, allowing the determination of the concentrations of at least one of alcohols, olefins and acids. The temperature of the separator or is then adjusted to change the concentrations to pre-determined values.

Description

Background of the invention [0001] Typical crude products from high alpha Fischer-Tropsch hydrocarbon synthesis (FT-HCS) are too heavy and waxy to be used as diesel fuel. Therefore, the method of hydrotreating the FT-HCS product is widely used to reduce the boiling point and improve the cold flow performance at the same time. Also, hydrotreating can remove any oxygenates and olefins produced during the FT-HCS process by converting them to the corresponding paraffins. Removal of olefins and oxygenates is desirable because high olefin content is directly related to poor oxidation stability and carboxylic acids contribute to fuel corrosivity. However, it is not expected to completely remove oxygenated organics including high molecular weight linear primary alcohols, and the Fischer-Tropsch distillate retaining the original long-chain primary alcohols exhibits surprisingly high lubricity. Prior art approaches maximize desired oxygenates while minimizing undesired carboxylic acid...

Claims

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Application Information

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IPC IPC(8): C10L1/10C10G2/00C10G7/12C10G32/04C10G35/00C10G45/72C10G67/02
CPCC10G2/30C10G45/72C07C5/13
Inventor B·R·库克P·J·勃罗维兹R·L·鲁克
Owner EXXON RES & ENG CO
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