Comparison of Structural Properties of Pitches Prepared from Petroleum Refinery/Petrochemical Residues using NMR Spectroscopy

Manoj Srivastava*, Manoj Kumar, U. C. Agrawal, M. O. Garg
CSIR - Indian Institute of Petroleum, Dehradun 248 005, India

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© 2012 Srivastava et al.;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Correspondence: * Address correspondence to this author at Indian Institute of Petroleum, Dehradun - 248 005, India; Tel +91 0135-2525772; E-mail :


Several petroleum pitches have been prepared by thermal treatment of various petroleum-derived residues such as clarified oil, aromatic extract and pyrolysis tars. These pitches were characterized physico-chemically (softening point, coking value, QI, & TI) and instrumentally (NMR) and compared. Attempts have been made to correlate physicochemical properties of petroleum residues and pitches with their NMR structural parameters through regression analysis. Studies on high temperature in-situ 1H NMR analysis of pitches have also been carried out. Structural characterization of petroleum residues and pitches is very useful for screening of petroleum residues and optimization of process variables for tailoring pitch properties for different end-use applications.

Keywords: Petroleum pitch, petroleum residues, mesophase, NMR.