Determination of N-methylpyrrolidone 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 interfere...

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Bibliographic Details
Published in:Fuel (Guildford) 1989-06, Vol.68 (6), p.796-799
Main Authors: Bhagat, S.D., Aswal, D.S., Badoni, R.P.
Format: Article
Language:English
Subjects:
Applied sciences
aromatic
Crude oil, natural gas and petroleum products
Energy
Exact sciences and technology
Fuels
gas chromatography
Petroleum products, gas and fuels. Motor fuels, lubricants and asphalts
tetralin
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Summary: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 NMP. The proposed method is based on an internal standardization technique applying tetralin as a reference compound. NMP content was determined from the calibration curve drawn with known weight ratios of 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 NMP.
ISSN:0016-2361
1873-7153
DOI:10.1016/0016-2361(89)90222-6