In the present study,the transesterification of glycerol trioleate was carried out over a basic ionic liquid,1-butyl-3- methylimidazolium hydroxide（[Bmim]OH） and an 87.2%yield of methyl ester was achieved.The product was isolated through simple decantation from the biphasic system due to the immiscibility of[BmimJOH with ester.[Bmim]OH can be easily recovered and reused six times without dramatic decrease in ester yield.
Sulfamic acid has been proved to be the most efficient and recyclable catalyst in carbamate synthesis from alkylamine and dialkyl carbonate.High selectivity,cost-efficiency and simple product separation were the advantageous features obtained in this process.Sulfamic acid could be reused several times and keep its initial activity in the recycle runs.In addition,sulfamic acid has also exhibited the potential catalytic ability for alkylation of aromatic amines.
