It has been noted that, beginning from early 1991 till now a substantial number of transesterification plants have been in operation all over the world. Continental Europe has been particularly active in this field, due to the interest of the bussiness itself but mainly due to the encouragement of Regional, National and EEC Authorities finally to search for a stable solution of the dramatic problems of pollution, a more rational use of city for fuels and a better performance of agricultural resources. The agreements of last GATT and consequence of new PAC has given a further impulse to this activity.