Separation of zinc dialkyldithiophosphates in lubricating oil additives by normal-phase high-performance liquid chromatography

N. Lambropoulos; T. J. Cardwell; D. Caridi; P. J. Marriott

doi:10.1016/0021-9673(96)00416-5

Separation of zinc dialkyldithiophosphates in lubricating oil additives by normal-phase high-performance liquid chromatography

N. Lambropoulos, T. J. Cardwell, D. Caridi, P. J. Marriott

Research output: Contribution to journal › Article › Research › peer-review

26 Citations (Scopus)

Abstract

Eleven zinc dialkyldithiophosphates have been synthesised and their mixtures separated by normal-phase HPLC on a 5-μm silica column. Dichloromethane- or heptane-based eluents containing alkylamine (≤ 0.4%) and acetic acid in a volume ratio of 2:1 and 1% methanol were suitable for separation of mixtures of these metal complexes in commercial lubricating oil additives. In all cases tested, the zinc complexes eluted from the column without decomposition and there was no evidence for ligand-exchange reactions having taken place during synthesis or on the column.

Original language	English
Pages (from-to)	87-94
Number of pages	8
Journal	Journal of Chromatography A
Volume	749
Issue number	1-2
DOIs	https://doi.org/10.1016/0021-9673(96)00416-5
Publication status	Published - 18 Oct 1996
Externally published	Yes

Keywords

Dialkyldithiophosphates
Lubricating oil additives
Mobile phase composition
Oils
Zinc dialkyldithiophosphates

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10.1016/0021-9673(96)00416-5

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abstract = "Eleven zinc dialkyldithiophosphates have been synthesised and their mixtures separated by normal-phase HPLC on a 5-μm silica column. Dichloromethane- or heptane-based eluents containing alkylamine (≤ 0.4%) and acetic acid in a volume ratio of 2:1 and 1% methanol were suitable for separation of mixtures of these metal complexes in commercial lubricating oil additives. In all cases tested, the zinc complexes eluted from the column without decomposition and there was no evidence for ligand-exchange reactions having taken place during synthesis or on the column.",

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AU - Cardwell, T. J.

AU - Caridi, D.

AU - Marriott, P. J.

PY - 1996/10/18

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N2 - Eleven zinc dialkyldithiophosphates have been synthesised and their mixtures separated by normal-phase HPLC on a 5-μm silica column. Dichloromethane- or heptane-based eluents containing alkylamine (≤ 0.4%) and acetic acid in a volume ratio of 2:1 and 1% methanol were suitable for separation of mixtures of these metal complexes in commercial lubricating oil additives. In all cases tested, the zinc complexes eluted from the column without decomposition and there was no evidence for ligand-exchange reactions having taken place during synthesis or on the column.

AB - Eleven zinc dialkyldithiophosphates have been synthesised and their mixtures separated by normal-phase HPLC on a 5-μm silica column. Dichloromethane- or heptane-based eluents containing alkylamine (≤ 0.4%) and acetic acid in a volume ratio of 2:1 and 1% methanol were suitable for separation of mixtures of these metal complexes in commercial lubricating oil additives. In all cases tested, the zinc complexes eluted from the column without decomposition and there was no evidence for ligand-exchange reactions having taken place during synthesis or on the column.

KW - Dialkyldithiophosphates

KW - Lubricating oil additives

KW - Mobile phase composition

KW - Oils

KW - Zinc dialkyldithiophosphates

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ER -

Separation of zinc dialkyldithiophosphates in lubricating oil additives by normal-phase high-performance liquid chromatography

Abstract

Keywords

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