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

A direct and rapid method for the estimation of ethyl alcohol in oxy diesel based on NMR ( 1 H, 13 C) 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 (...

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Bibliographic Details
Published in:Petroleum science and technology 2013-04, Vol.31 (8), p.819-828
Main Authors: Bansal, V., Swami, K. K., Kumar, Ravindra, Sarpal, A. S.
Format: Article
Language:English
Subjects:
Alcohols
Applied sciences
Blends
Crude oil, natural gas and petroleum products
Diesel
Diesel fuels
Energy
Ethyl alcohol
Exact sciences and technology
Fuels
group molecular weight
NMR spectroscopy
oxy diesel
Petroleum products, gas and fuels. Motor fuels, lubricants and asphalts
Polymer blends
Processing of crude oil and oils from shales and tar sands. Processes. Equipment. Refinery and treatment units
Spectra
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Summary:A direct and rapid method for the estimation of ethyl alcohol in oxy diesel based on NMR ( 1 H, 13 C) 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 1 H/ 13 C-NMR spectra have also been studied.
ISSN:1091-6466
1532-2459
DOI:10.1080/10916466.2010.533597