To provide a simple manufacturing method of an ester for lubricating oils which achieves satisfactory acid elimination and decoloring even if a sorbent is used in a reduced amount.
The manufacturing method of the ester for lubricating oils comprises the step (1) wherein an aliphatic polyhydric alcohol (A) and a saturated aliphatic monocarboxylic acid (B) are reacted to obtain reaction products including esters; the first acid elimination step (2) wherein the unreacted saturated aliphatic monocarboxylic acid is removed from the reaction products obtained in the step (1); the step (3) wherein the reaction products that have undergone the acid elimination through the step(2) is decolored; and the second acid elimination step (4) wherein the unreacted saturated aliphatic monocaboxylic acid is removed from the reaction products decolored by the step (3).
COPYRIGHT: (C)2005,JPO&NCIPI
Yoshihito Michigami
Fumihiro Shiojiri
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Takahiko Mizobe
Shinji Mochida
Yoshitsune Kazumasa