Quality Control Aspects: A Simple Method for Estimation of Ethyl Alcohol in Oxy Diesel by NMR Spectroscopy

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A direct and rapid method for the estimation of ethyl alcohol in oxy diesel based on NMR (1H, 13C) spectroscopic techniques has been developed. The estimation has been carried out by the methods (a) based on the determination of average group molecular weight (GMW) of the diesel and alcohol and (b) with precalibration of quantitative alcohol-diesel blends. Both the methods are independent of source, type, and nature of diesel (conventional, hydrocracked, hydrodesulfurization) produced by any of refinery processes. The precalibration method requires the use of standards for calibration, where as the GMW method does not require any. The methods have been tried on alcohol-diesel blends in the range of 1.0–10.0% w/w and will be applicable for quality control purposes in blending plant. The statistical treatment of theoretical and estimated values have shown excellent correlation (R 2 = .99). The effects of the spectral interference of emulsifier and coupler, which are added to emulsify the blends, on the chemical shift of alcohol signals in the 1H/13C-NMR spectra have also been studied.