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The overbasing of detergent additives: The behaviour of promoters and determination of factors controlling the overbasing reaction
Author(s) -
Belle C.,
Gallo R.,
Jacquet F.,
Hoornaert P.,
Roman J. P.
Publication year - 1992
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010050103
Subject(s) - chemical reaction , diffusion , chemical engineering , chemistry , particle (ecology) , mechanism (biology) , reaction mechanism , colloid , chemical reaction engineering , process (computing) , calcium carbonate , organic chemistry , thermodynamics , catalysis , physics , engineering , computer science , geology , oceanography , quantum mechanics , operating system
The mechanism of overbasing of additives used in lubricating oils is studied. Overbased calcium sulphonates, the most widely used, are examined. Although the geometrical and physical nature of colloidal carbonate particles has been well studied, little is known about the fundamental aspects and mechanism of the overbasing process. In this paper, assessment of the physical and/or chemical nature of the reaction is made from equations related to the chemical engineering model of the shrinking spherical particle. The results show that the overbasing process is under diffusion control, and the chemical reaction is not determining.