process of catalytic fluorination in liquid phase of product 2 - chloro - 3 , 3 , 3 - trifluoropropene into product 2 - chloro - 1 , 1 , 1 , 2 - tetrafluoropropane , with an ionic liquid based catalyst . process for manufacturing 2 , 3 , 3 , 3 - tetrafluoropropene .