Estimation of Bromine Number of Petroleum Distillates by NMR Spectroscopy

• Published in: Energy & fuels 2000-09, Vol.14 (5), p.1028-1031
• Main Authors: Bansal, V., Sarpal, A. S., Kapur, G. S., Sharma, V. K.
• Format: Article
• Language: English
• Subjects: Applied sciences; Crude oil, natural gas and petroleum products; Energy; Exact sciences and technology; Fuels; Processing of crude oil and oils from shales and tar sands. Processes. Equipment. Refinery and treatment units
• ISSN: 0887-0624; 1520-5029
• DOI: 10.1021/ef000028w

In the present work, a direct and fast method based on NMR spectroscopic techniques (1H/13C) has been developed for the estimation of bromine number of gasoline and coker kerosine (CK) fuel samples of boiling range 50−250 °C. Two approaches have been adopted. In the first, the percentage unsaturation (H I O%) in the chemical shift range of 4.6−6.6 ppm (1H NMR) has been correlated with the predetermined bromine number of the samples. The H I O% versus bromine number gives a straight line, with proportionality constant K = 16.2 (FCC) and 9.3 (Coker) products. In the second approach, the relative number of double bonds (D) in the sample has been determined by 1H/13C NMR method. The bromine number has been estimated using developed equations. A very good correlation (correlation coefficient, R 2 = 0.98) has been observed between the NMR methods and the standard method (IP:  129/81, reapproved 1988). The 13C NMR method is independent of the nature of olefins, source of feed, and catalyst/cracking conditions compared to the 1H NMR spectroscopy method.