Method and apparatus for controlling FCC effluent with near-infrared spectroscopy

Inactive Publication Date: 2008-04-03
MARATHON PETROLEUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]The novel of NIR is the ability to conduct RMS testing on-line. The NIR will provide a near instantaneous prediction of unit yields and does not require the physical collection of samples for distillation and analysis by an outside laboratory. This facilitates all the benefits of the current RMS objectives and allows for more frequent optimization.

Problems solved by technology

The collection of effluent sample from the overhead line essentially decouples the reactor-regenerator section from the main fractionator, often making it unnecessary to line out the fractionator and gas plant before taking the next sequential set of RMS samples.

Method used

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  • Method and apparatus for controlling FCC effluent with near-infrared spectroscopy
  • Method and apparatus for controlling FCC effluent with near-infrared spectroscopy
  • Method and apparatus for controlling FCC effluent with near-infrared spectroscopy

Examples

Experimental program
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example 1

[0040]Different feedstocks will result in different yields from the FCC process. If the unit is operating against a constraint, the process will need to adjust to avoid exceeding an equipment limitation. Typical process variables include feed rate, reactor temperature, feed preheat and pressure. The process response from each of the variables is non-linear. The optimum set of conditions to maximize profitability to unit constraints will typically vary depending upon the feed quality. The following is an example of different operating conditions required to maximize profitability for a change in feed:

New FeedNew FeedNew Feed withwith Onlywith OnlyNormalMultivariableRateROTOperationOptimizationVariedVariedFeed PropertiesAPI24.621.821.821.8UOP K11.6911.7711.7711.77Concarbon (%)0.150.590.590.59Nitrogen (ppm)1150162162162Sulfur (%)0.340.550.550.551-ring Aromatics35292929(%)2-ring Aromatics34262626(%)3-ring Aromatics17252525(%)4-ring14202020Aromatics+(%)ProcessConditionsFeed Rate10095.383...

example 2

[0042]FIG. 2 is a Table which shows samples, including hydrotreater chargers and products and FCC feeds used to control weight percents of each hydrocarbon class.

[0043]Two hundred fifty samples, including hydrotreater charges and products and FCC feeds were used to create a PLS model for predicting weight percents of each hydrocarbon class. The samples were analyzed using the online NIR. Wavelengths were chosen for each group and a summary appears in FIG. 2.

example 3

The Effect or Riser Temperature

[0044]One of the most common types of process variable studies completed via the use of reaction effluent testing is the impact of riser outlet temperature on FCC reactor yields. This is one of the most fundamental sets of data required to optimize the performance of the FCC unit. Table 1 contains results from a riser temperature test runs series. For this study, reactor effluent samples were collected at three different riser outlet temperatures, with the maximum riser temperature constrained by the ability to handle gas volumes in the FCC gas plant.

TABLE 1Effect of Riser Outlet Temperature on FCC Product YieldsRiser Outlet Temperature: F.+15° F.Base−18° F.Unit Conversion: Volume % FF+1.4Base−3.2Gasoline Yield: Volume %−0.3Base+0.2Total C3 plus C4 Yield: Volume % FF+1.3Base−3.8Ethane and Lighter Yield: Weight % FF+0.51Base−0.63Coke Yield: Weight % FF+0.17Base−0.18

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PUM

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Abstract

On-line controlling of catalytic cracking processing is provided which uses near infrared (NIR) analysis to characterize FCC effluent and the resulting characterization thereof. The NIR results can be used in FCC software to control on-line unit yields and qualities.

Description

TECHNICAL FIELD[0001]This invention relates to controlling FCC reactor effluent yields with near infrared spectroscopy. More specifically, the present invention relates to the use of NIR to conduct RMS testing on-line.BACKGROUND OF THE INVENTION[0002]Near IR spectroscopy has been used in the past to determine physical properties of petroleum hydrocarbon mixtures. This includes using the NIR results to control refinery processes including gasoline blenders and catalytic reforming units. It is a quick, non-destructive analytical technique that is correlated to primary test methods using a multivariate regression analysis algorithm such as partial least squares or multiple linear regression. It has been used in a laboratory to predict properties of refinery blender streams and finished gasoline and diesel fuel.[0003]Optimization, design and control of catalytic cracking process units all benefit from kinetic models which describe the conversion of feeds to products. In order to properl...

Claims

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Application Information

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IPC IPC(8): C10G11/00
CPCC10G11/187
Inventor SEXTON, JEFFWILT, BRIAN K.
Owner MARATHON PETROLEUM
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