2140.     LORENZEN, G.  [Gas Purification, Especially Desulfurization and Sulfur Recovery.]  Chem. Fabrik, vol. 12, 1939, pp. 6-23; Chem. Abs., vol. 33, 1939, p. 2312.

                    Review of modern methods of removing dust, tar, NH3, C₆H₆, NO, and S from gases intended for use in syntheses, with 48 cuts of apparatus and 55 refs.