Hi ,
could it be possible for anyone to inform me hoew to do esterfication of biodiesel ?what would be the best heating degree and timing..and ..
Thanks in advance for kind help.

Probably the best place to start is this site:

http://www.biodieselcommunity.org/mainpage/

It is specifically designed to answer 99% of your questions as a newbie.

Once your pretty familiar with that info, then try out the discussion group here:

http://biodiesel.infopop.cc/eve/forums/a/frm/f/719605551

We're question friendly and very motivated to help.

Finest regards,

troy

nese: if you are specifically interested in raw oil processing, as opposed to degummed, filtered, bleached cooking and salad oil, there are some differences to consider and pitfalls to avoid. Otherwise everythign you need to know to convert used cooking oil or store-bought fresh oil to biodiesel is available at the places troy mentions.
Cheers, and welcome,
JohnO