Franz Ritter von Soxhlet (January 12, 1848 – May 5, 1926) was a German agricultural chemist from Brno. He invented the Soxhlet extractor in 1879 and in 1886 he proposed pasteurization be applied to milk and other beverages. Soxhlet is also known as the first scientist who fractionated the milk proteins in casein, albumin, globulin and lactoprotein. Furthermore, he described for the first time the sugar present in milk, lactose. He gained a PhD in Leipzig in 1872. He was the son of a Belgian immigrant.