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Kinetics and reaction pathways of total acid number reduction of cyclopentane carboxylic acid using subcritical methanol

Mandal P. C., Nagarajan T.

Polish Journal of Chemical Technology

2016

Vol. 18, nr 3

44-49

Cyclopentane carboxylic acid (CPCA) is a model compound of Naphthenic acids (NAs). This objective of this paper is to discover total acid number (TAN) reduction kinetics and pathways of the reaction between CAPA and subcritical methanol (SubC-MeOH). The experiments were carried out in an autoclave reactor at temperatures of 180-220°C, a methanol partial pressure (MPP) of 3 MPa, reaction times of 0-30 min and CPCA initial gas phase concentrations of 0.016-0.04 g/mL. TAN content of the samples were analyzed using ASTM D 974 techniques. The reaction products were identified and quantified with the help of GC/MS and GC-FID respectively. Experimental results reveal that TAN removal kinetics followed first order kinetics with an activation energy of 13.97 kcal/mol and a pre-exponential factor of 174.21 s-1. Subcritical methanol is able to reduce TAN of CPCA decomposing CPCA into new compounds such as cyclopentane, formaldehyde, methyl acetate and 3-pentanol.

Lubricating oil properties – effect of using high acidity fuel

Piaszyk J., Wyszynski M. L.

Combustion Engines

2013

R. 52, nr 3

762--768

This paper presents results of an investigation focusing on the effect of high acidity fuel (high TAN) on the properties of lubricating oil. The capability of the upgraded lubricating oil (increased TBN) to withstand an operation of the engine when fuelled with animal fat was checked. Two lubricating oils were compared. A thermogravimetric method is proposed for characterisation of deposits formed in the lubricating oil centrifuge.