How do I create azeotrope mixture? I want to decrease the boiling point of a compound. So I need to create an azeotrope mixture from two or three compounds. Where can I find out how make it?
Boiling point can be decrased by lowering pressure over liquide. If you insist on the azeotrop preparation, find azeotrop diagram such as:  

or data table such as: wiki and determine the composition that must be achieved to obtain the azeotropic mixture. Then mix it accordingly.