374.     ------.  [BROWN, R. L., AND GALLOWAY, A. E.]  Methanol From Hydrogen and Carbon Monoxide.  II.  Dimethyl Ether.  Ind. Eng. Chem., vol. 21, 1929, pp. 310-313; Chem. Abs., vol. 23, 1929, p. 2150.

      Production of Me₂O (I) as a side reaction of the synthesis of MeOH (II) over ZnCrO₄ at 300°-400° and 180 atm. has been studied.  The formation of I is slow and increases with temperature to 5.2% at 397° while II reaches a maximum of about 30% at 375° and then falls off.  High space velocity favors formation of II.