(47a) Magnetic Imaging to Model Olefin Product Yields from High Severity Naphtha Cracking

This work reports results from the Magnetic Imaging of Pyrolysis Feedstocks system, acronym MIPF (pronounced with P silent), for a full range Naphtha feedstock and attempts to relate these to yields of olefin products obtained from its high severity cracking in a modern furnace. The MIPF system comprizes three facets, namely, sample preparation, NMR experiments, and data analysis. Sample preparation incorporates internal standards into the feedstocks to enable precise analysis of the NMR experiments, which provide quantitative C13 and H1 spectra, elaborated by 1- and 2-D procedures, such as DEPT and HETCOR. Data analysis employs (1) an Integral Regions IR train, that provides coarse but complete information about all the carbon and hydrogen atoms in a feedstock, particularly the aromatic C and H atoms, and (2) a Canonical Groups CG train, that provides high-level information about chemical moieties and compounds, but detects only about half of all the atoms in the feedstock, particularly those in n- and methyl-alkane chains. Yields of ethylene, propylene, buta-1,3-diene, benzene, toluene, and styrene were compared with IR- and CG-train derived MIPF parameters to presage the performance of this Naphtha as an ethylene plant feedstock.