728.    DOLGOV, B. N., KARPOV, A. Z., AND VELTISTOVA, M. V.  [Methanol Synthesis.  VII.]  Khim. Tverdogo Topliva, vol. 4, 1933, pp. 492-499; Chem. Abs., vol. 28, 1934, p. 6279.

     Catalyst that was used previously (see abs. 724) and that still retained its activity was analyzed after 186 experiments.  It contained ZnO, 78.1, Cr₂O₃, 18.3; Fe₂O₃, 0.3; and S, 2.0%.   The missing 1.1% includes admixtures such as ZnCO₃ and ZnSO₄.  The influence of the volume velocity of the mixture of gases on the MeOH yield was investigated; at 350 l./hr. the volume velocity is 35,600, the duration of contact 10.4 sec., and the yield of MeOH 750 gm./hr.  The frequency of the discharge of the MeOH from the apparatus affects the yields considerably; on discharging every 5 min. during 1 hr., 457 cm.³ of MeOH is obtained; in discharging every 30 min., the yield is only 373 cc.  In the experiments carried out with water gas alone, without the addition of H₂, an appreciable decrease in the activity of the catalyst takes place.  With the increase of the amount of the H₂, through conversion of the CO and consequent formation of H₂O, the activity of the catalyst increases, remaining, nevertheless, below that existing in the presence of enough H₂.  Small amounts of AcOH, EtOAc, AcH, allyl alcohol, acetone, Fe carbonyl, S, and H₂O are formed, in addition to 96% MeOH.