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Method and apparatus for controlling catalytic cracking by 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]Real Time Optimization concept, for the refining industry to utilize direct measurement of feed and processing conditions to manipulate the process. We have developed a practice utilizing Advance Process Control (APC) technology to maximize operation against constraints. RTO allows the process to trade yield, recovery, capacity and efficiency among different process variables and equipment constraints. An on-line measurement of feed and product qualities via NIR enables the RTO process to work. This novel use of NIR is the ability to measure feed and products on-line as input to a RTO application on an FCC unit.
[0008]A near IR (NIR) spectrophotometer can be used to collect spectra on fluid catalytic cracking (FCC) feed stocks. The collected NIR spectral data was correlated to traditional laboratory tests including HPLC Heavy Distillate Analyzer (HDA) results of aromatic core type (1-ring core, 2-ring core, 3-ring core, 4-ring core and polars), ASTM D2887 high temperature simulated distillation, basic nitrogen, total nitrogen, API gravity, total sulfur, MCRT, and percent of Coker gas oil in Vacuum Gas Oil (VGO). The NIR can be used to monitor the FCC feed stocks quality more quickly and efficiently than performing the lab tests. The NIR results can be used to monitor the FCC feed stocks quality more quickly and efficiently than perform the lab tests.

Problems solved by technology

However, this practice requires detailed feed and product yield and analytical data.
Current analytical techniques require a long lead time to generate the needed input to the model.

Method used

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  • Method and apparatus for controlling catalytic cracking by near-infrared spectroscopy
  • Method and apparatus for controlling catalytic cracking by near-infrared spectroscopy
  • Method and apparatus for controlling catalytic cracking by near-infrared spectroscopy

Examples

Experimental program
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example 1

[0043]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 FeedNormalwith Multi-with Onlywith OnlyOper-variableRateROTationOptimizationVariedVariedFeed PropertiesAPI24.621.821.821.8UOP K11.6911.7711.7711.77Concarbon (%)0.150.590.590.59Nitrogen (ppm)1150162162162Sulfur (%)0.340.550.550.551-ring Aromatics (%)352929292-ring Aromatics (%)342626263-ring Aromatics (%)172525254-ring Aromatics+ (%)14202020Process ConditionsFeed Rate ...

example 2

[0045]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.

[0046]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

[0047]FIGS. 3 and 4 illustrate typical NIR absorption spectra of FCC feed samples and the resulting 2nd derivative spectra.

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Abstract

On-line controlling of catalytic cracking processing is provided which uses near infrared (NIR) analysis to characterize cracking feed for parameters such as saturates, aromatics, and thiophene content 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 a catalyzed cracking unit (FCC) and feedstock selection by near infrared spectroscopy. More specifically, the present invention relates to the controlling on-line of catalytic cracking processes for producing lower molecular weight products from hydrocarbon feeds by NIR spectroscopy.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 c...

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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