PROCESS FOR PREPARING AN ORGANIC ACID OR ITS DERIVATIVES USING A HOMOGENEOUS MC-TYPE CATALYST AND AN O2/CO2 MIXTURE
申请人:Yoo Jin S.
公开号:US20080091043A1
公开(公告)日:2008-04-17
The present invention relates to a process for producing an organic acid or its derivatives, which comprises oxidation of a hydrocarbon substrate in the presence of a homogeneous MC-type catalyst and an oxidant. In particular, the present invention relates to a process comprising oxidation of a hydrocarbon substrate in the presence of a homogeneous MC-type catalyst selected from Co/Br, Mn/Br, Co/Mn/Br and Co/Mn/M/Br and an O
2
/CO
2
mixed gas oxidant where the partial pressure of O
2
is controlled to 30-40%, thereby improving the oxidation rate, the conversion, the selectivity and the yield even under milder conditions. Especially, the present invention remarkably reduces down to a negligible level the production of color impurities and other impurities such as 4-CBA and p-toluic acid, which had been conventionally removed by hydrogenation reduction. Further, the loss in acetic acid solvent due to combustion can also be drastically decreased using the method of the present invention.
本发明涉及一种生产有机酸或其衍生物的方法,其中在均相MC型催化剂和氧化剂的存在下氧化碳氢化合物底物。特别地,本发明涉及一种方法,其中在氧化碳氢化合物底物的存在下,在选择自Co/Br、Mn/Br、Co/Mn/Br和Co/Mn/M/Br的均相MC型催化剂和O2/CO2混合氧化剂的情况下,控制O2的分压为30-40%,从而在较温和的条件下提高氧化速率、转化率、选择性和产率。特别地,本发明显著降低到可以忽略不计的水平,如4-CBA和对甲苯酸等色杂质和其他杂质的产生,这些杂质通常通过氢化还原去除。此外,使用本发明的方法还可以大大减少由于燃烧而导致的乙酸溶剂损失。