5 Principle and Processing of Biodiesel Production
131
RCOR′
H
+
RCOR′
MeOH RCOH
−R′OH RC OH
+
−H
+
RC
OMe
O
OMe
HO R′
+
OH
O
+
+
HOMe
OR′
(2) Reaction mechanism of alcoholysis with base catalysis
RCOR′
O
MeO
-
RC O
-
OMe
OR′
RC
OMe
O
+ R′O - MeOH R′OH+ MeO
- +RCOOCH 3
(3) Reaction mechanism of alcoholysis with enzyme catalysis