He studied at the Séminaire de Nicolet, then articled in law with Antoine Polette and was called to the bar in 1844. Loranger first practiced at Trois-Rivières, later joined the office of Lewis Thomas Drummond in Montreal and, in 1858, opened an office with his brothers Louis-Onésime and Jean-Marie.
After studying at the Séminaire de Nicolet, Loranger began his legal career apprenticing under Antoine Polette before being admitted to the bar in 1844. He initially practiced in Trois-Rivières, later joining Lewis Thomas Drummond's firm in Montreal and establishing his own office with his brothers Louis-Onésime and Jean-Marie in 1858.