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Yourlocation: Home > News > Determination of N-methyl pyrrolidone in lubricating oil samples by g.c.
Determination of N-methyl pyrrolidone in lubricating oil samples by g.c.A rapid gas chromatographic procedure has been developed for quantitative estimation of N-methyl-2-pyrrolidone (NMP) in extract and raffinate phases of lubricating oil extraction processes. Column backflush technique or lubricating oil trap devices were the two approaches used to avoid the interference of lube hydrocarbons with the normal analysis of  N-methyl pyrrolidone NMP. The proposed method is based on an internal standardization technique applying tetralin as a reference compound.  N-methyl pyrrolidone NMP content was determined from the calibration curve drawn with known weight ratios of  N-methyl pyrrolidone NMP and tetralin against the corresponding area ratios. Carbowax 20 M was found to be the best analytical column for separation and quantitation work, whereas a non-polar phase OV-101 was used as lube retainer. FID and TCD systems were employed to cover a wide concentration range from traces to high percentages of  N-methyl pyrrolidone NMP.

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