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    • 8. 发明授权
    • Air oxidation of an aromatic aldehyde to an aromatic acid
    • 将芳族醛空气氧化成芳香酸
    • US06740776B2
    • 2004-05-25
    • US10196600
    • 2002-07-15
    • Ratna ShekharMichael John Girgis
    • Ratna ShekharMichael John Girgis
    • C07C5123
    • C07C51/235C07C63/04
    • A low temperature process for preparing an aromatic acid having formula (I), said process comprising reacting an aromatic aldehyde having formula (II) with a gas having an oxygen content of 1 to 100 weight percent, based on the total weight of the gas, at a temperature of about 20° C. to less than 100° C. in the presence of a supported Group VIII metal catalyst, and a solvent having a flash point greater than 95° C. and/or a melting point less than 55° C., provided that the flash point of the solvent is greater than the reaction temperature, wherein R1 and R2 are independently selected from the group consisting of hydrogen and a C1-C8 linear, branched or cyclic alkyl group. The process of the invention yields an aromatic acid in excellent yield, and (i) does not involve the use of deleterious oxidizing agents; (ii) is essentially free of by-products; and (iii) is accomplished at a temperature of less than 100° C.
    • 用于制备具有式(I)的芳族酸的低温方法,所述方法包括使具有式(II)的芳族醛与基于气体总重量的1至100重量%的氧含量的气体反应, 在负载的第VIII族金属催化剂的存在下,在约20℃至小于100℃的温度下,和闪点大于95℃和/或熔点小于55℃的溶剂 条件是溶剂的闪点大于反应温度,其中R 1和R 2独立地选自氢和C 1 -C 8直链,支链或环状的烷基。 本发明的方法得到优异的收率的芳香酸,(i)不涉及有害氧化剂的使用; (ii)基本上不含副产物; 和(iii)在小于100℃的温度下完成。