Method and apparatus for controlling FCC hydrotreating by near-infrared spectroscopy

a technology of near-infrared spectroscopy and hydrotreating method, which is applied in the direction of cracking process, catalytic cracking, petroleum industry, etc., can solve the problem that current analytical techniques require a long lead time to generate the needed input to the model, and achieve improved yield selectivity, improved control and operation of targets, and higher product value

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

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Benefits of technology

[0008]The CFH pretreats the FCC feedstock to remove process FCC contaminants such has sulfur, nitrogen and concarbon. In the process, the CFH adds hydrogen to the FCC feed and saturates some of the aromatic components. This results in improved yield selectivity from the FCC unit and higher product value. Use of on-line NIR characterization of feed and product from the CFH will provide improved control and operation to targets to maximize FCC profitability and ensure FCC environmental emissions and product specifications are maintained. The CFH cycle life can also be more effectively managed to ensure feed to the CFH is controlled to achieve the desired catalyst cycle life. On-line monitoring of feed quality will also assist in pro-active trouble shooting to minimize operating problems from feed quality upsets.
[0009]This novel use of NIR is the ability to measure feed and products to and from CFH and FCC unit on-line to serve as a tool to optimize performance.
[0011]Use of NIR to measure feed and products to and from the CFH and FCC will now enable the user to adjust the CFH operating conditions to maximize FCC feed value and adjust FCC operating conditions to maximize FCC product value. This is consistent with the FCC RTO application with the added advantage of being able to pro-actively adjust the FCC feed value with the CFH optimization.

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 FCC hydrotreating by near-infrared spectroscopy
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  • Method and apparatus for controlling FCC hydrotreating by near-infrared spectroscopy

Examples

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example 1

[0038]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:

Nor-New FeedNew FeedNew Feedmalwith 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

[0040]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.

[0041]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

[0042]FIG. 3 is a plot that illustrates HDS vs. AS mode differences. The plot shows FCC feed sulfur under different operating philosophies. The feed sulfur is held constant and aromatics, nitrogen or concarbon parameters are varied.

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Abstract

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

Description

TECHNICAL FIELD[0001]This invention relates to controlling FCC hydrotreating by near infrared spectroscopy. More specifically, the present invention relates to on-line controlling FCC hydrotreating 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 cracking process units all benefit from kinetic models wh...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10G11/00
CPCC10G11/187
Inventor SEXTON, JEFFWILT, BRIAN K.
Owner MARATHON PETROLEUM
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