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PATENT 3389. ----- [SOCIÉTÉ CHIMIQUE DE LA GRANDE PAROISSE, AZOTE ET PRODUITS CHIMIQUES.] [Formaldehyde.] German Patent 557,650, May 28, 1927. Chem. Abs., vol. 27, 1933, p. 515. Co virtually free from H2 is passed over a catalyst with H2O or steam at temperatures > 200° and preferably at 320°-360°, to yield CH2O. The catalyst consists of oxides or salts of Mg, Zn, Mn, Sn, or Sb, or other metals of the same groups. Apparatus is indicated. |