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Residual Catalytic Cracking - Feedstream Analysis by NMR
Current Technique for Feedstream Analysis:
Analysis Performed – Refractive Index, Distillation, Specific Gravity
Calculation Obtained – Watson K-Factor
Outcome: aromatic carbon number, aromatic hydrogen number, total hydrogen content
Proposition: Detailed hydrocarbon analysis for kinetic model development.
Our experience is that an improved and useful analysis can be obtained from NMR analysis. There are several ways to approach the NMR analysis and the chemometric approach to correlating NMR data to physico-chemical parameters of use to process control.
RCC Feedstream Analysis by 1H and 13C NMR: Multivariate Prediction of Chemical and Physical Properties
John C. Edwards , Ph.D.
Process NMR Associates, LLC,
87A Sand Pit Rd, Danbury CT USA
Jincheol Kim,
SK Energy Co., Ltd, SK Energy Technology Center,
140-1, Wonchon-dong, Yuseong-gu, Daejeon 305-712, Korea
Presented at the 236th ACS National Meeting, Philadelphia PA, August 17-21, 2008
Summary of Slides
1) 60 MHz process NMR data available from online NMR unit.
2) 300 MHz 1H NMR data available from standard NMR experiments on laboratory NMR system at Process NMR Associates
3) Expansions of 1H NMR data on RCC Feeds
4) Calculated 1H NMR Parameters Represented as an alternative "spectrum" for use in chemometric modeling and linear regression.
5) 13C NMR Data obtained on RCC Feeds
6) Expansions of 13C NMR Data
7) 13C NMR and Average Molecule Parameters Calculated from 13C Spectrum
8) Calculated 13C NMR Parameters Represented as an alternative "spectrum" for use in chemometric modeling and linear regression.
9) Correlations of Spectra and Calculated Parameters to Physico-Chemical properties of RCC Feeds
10) Correlation of Spectra and Calculated Parameters to Density
11) Variable Selection for Linear Correlation of Calculated NMR Parameters to Physico-Chemical Properties of RCC Feeds.
12) Correlation of Calculated 13C NMR Parameters (C-Type and Average Molecule) with both high resolution 1H and 13C NMR spectra. Models created can be utilized by personnel with no NMR experience to calculate NMR parameters directly from the spectrum without any prior knowledge of integrations or calculations to be performed.
