Method for selectively producing acetic acid through the...

C - Chemistry – Metallurgy – 07 – C

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C07C 51/215 (2006.01) C07C 51/25 (2006.01)

Patent

CA 2307337

The invention relates to a method for selectively producing acetic acid from a gaseous feedstock of ethane, ethylene or mixtures thereof and oxygen at a high temperature. Said gaseous feedstock is brought together with a catalyst containing the elements Mo, Pd, X and Y in the gram-atomic ratios a:b:c:d in combination with oxygen: Mo a Pd b X c Y d (I). Symbols X and Y have the following meaning: X represents one or several of the elements chosen from the group Cr, Mn, Nb, Ta, Ti, V, Te and W; Y represents one or several of the elements chosen from the group B, Al, Ga, In, Pt, Zn, Cd, Bi, Ce, Co, Rh, Ir, Cu, Ag, Au, Fe, Ru, Os, K, Rb, Cs, Mg, Ca, Sr, Ba, Nb, Zr, Hf, Ni, P, Pb, Sb, Si, Sn, Tl and U, the indices a, b, c, d and x represent the gram-atomic ratios of the corresponding elements: a=1, b=0.0001 to 0.01, c=0.4 to 1 and d=0.005 to 1. The space-time yield in the oxidation to acetic acid using the inventive method is > 150 kg/hm3. The selectivity of the oxidation reaction of ethane and/or ethylene to acetic acid is especially >= 70 mol %.

L'invention concerne un procédé de préparation sélective d'acide acétique par charge d'alimentation sous forme gazeuse d'éthane, d'éthylène ou de mélanges de l'un et de l'autre, ainsi que d'oxygène à température très élevée. La charge d'alimentation gazeuse est introduite conjointement avec un catalyseur contenant les éléments Mo, Pd, X et Y dans des rapports atome-gramme a:b:c:d en combinaison avec de l'oxygène: MoaPdbXcYd (I). Les symboles X et Y ont la signification suivante: X désigne un ou plusieurs des éléments sélectionnés dans le groupe comprenant Cr, Mn, Nb, Ta, Ti, V, Te et W; Y désigne un ou plusieurs des éléments sélectionnés dans le groupe comprenant B, Al, Ga, In, Pt, Zn, Cd, Bi, Ce, Co, Rh, Ir, Cu, Ag, Au, Fe, Ru, Os, K, Rb, Cs, Mg, Ca, Sr, Ba, Nb, Zr, Hf, Ni, P, Pb, Sb, Si, Sn, Tl et U; les indices a, b, c, d et x désignent les rapports atome-gramme des éléments correspondants: a=1; b=0,0001 à 0,01; c=0,4 à 1; et d=0,005 à 1. Selon l'invention, le rendement spatio-temporel lors de l'oxydation pour former de l'acide acétique est > 150 kg/hm<3>. La sélectivité de la réaction d'oxydation de l'éthane et/ou de l'éthylène pour former de l'acide acétique est notamment >/= 70 % en mole.

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