Does anyone know the definition of Azeotropes ? I am trying to remove acetonitrile and methanol from an aqueous solution through distillation. I can remove them completely due the formation of Azeotropes. Thanks for your information in advance! Wei Xing __________________ ORGLIST - Organic Chemistry Mailing List Website / Archive / FAQ: http://www.orglist.net/ List coordinator: Joao Aires de Sousa (jas@mail.fct.unl.pt)