PRODUCTION OF PHTHALIC ANHYDRIDE BY GAS PHASE OXIDATION OF O-XYLOL
    4.
    发明申请
    PRODUCTION OF PHTHALIC ANHYDRIDE BY GAS PHASE OXIDATION OF O-XYLOL 审中-公开
    通过邻二甲苯的气相氧化制备邻苯二甲酸酐

    公开(公告)号:WO2007135104A8

    公开(公告)日:2008-06-12

    申请号:PCT/EP2007054841

    申请日:2007-05-18

    CPC classification number: C07D307/89 C07C51/265 C07C63/16

    Abstract: The invention relates to a method for producing phthalic anhydride by catalytic gas phase oxidation of o-xylol. According to said method, a gaseous mixture of o-xylol and an oxygen-containing gas is guided through at least two reaction zones in a main reactor, the temperature of said reaction zones being adjustable independently of each other, and is reacted to give a gaseous intermediate reaction product which contains unreacted o-xylol, phthalic anhydride reaction products with a lower oxidation state and phthalic anhydride, and the intermediate reaction product is introduced into a secondary reactor. The temperature in the reaction zones in the primary reactor is controlled in such a manner that the concentration of the unreacted o-xylol in the intermediate reaction product is at least 0.5% by weight. The method according to the invention allows an increase in total yield of phthalic anhydride without any or without substantial decrease in product quality.

    Abstract translation: 用于通过邻二甲苯,其中其将通过至少两个反应区,其是独立温度可控地转发所描述的,含有氧的气体邻二甲苯的气体混合物,并在主反应器的催化气相氧化制备邻苯二甲酸酐,于气态中间反应产物的方法 反应含有未反应的邻二甲苯,邻苯二甲酸酐欠氧化产品和邻苯二甲酸酐,以及将所述中间反应产物分离成二级反应器,其特征在于,它调节在主反应器中的反应区的温度,即未转化的邻二甲苯中的中间反应产物中的浓度为至少0 ,5重量%(重量)。 该方法允许增加邻苯二甲酸酐的总产没有或没有在产品质量上显著恶化。

    METHOD FOR LONG-TERM OPERATION OF A HETEROGENEOUSLY CATALYZED PARTIAL GAS PHASE OXIDATION OF PROPENE TO OBTAIN ACROLEIN
    5.
    发明申请
    METHOD FOR LONG-TERM OPERATION OF A HETEROGENEOUSLY CATALYZED PARTIAL GAS PHASE OXIDATION OF PROPENE TO OBTAIN ACROLEIN 审中-公开
    方法长期运行丙烯到丙烯醛的非均相催化部分气相氧化

    公开(公告)号:WO2012049246A3

    公开(公告)日:2012-06-14

    申请号:PCT/EP2011067887

    申请日:2011-10-13

    CPC classification number: C07C45/35 C07C47/22

    Abstract: Disclosed is a method for long-term operation of a heterogeneously catalyzed partial gas phase oxidation of propene to obtain acrolein, in which the propene contained in the fed reaction gas mixture is partially oxidized when said gas mixture penetrates the fixed catalyst bed that is accommodated in two spatially successive temperature zones A, B, and in order to prevent the quality of the fixed catalyst bed from deteriorating during long-term operation, the temperature in at least one of the two temperature zones is raised in such a way that the difference TB- TA becomes greater and greater, where TB is the temperature in temperature zone B and TA is the temperature in temperature zone A.

    Abstract translation: 一种用于丙烯的非均相催化部分气相氧化成丙烯醛,其中部分氧化的通过固定催化剂床,其被容纳在两个空间上连续的温度区A,B传递时该气体混合物中,并且,在长期运转中所含的反应气体输入混合物的丙烯的长期操作方法,作为针对一个测量 减少在固定催化剂床的质量,两个温度区中的至少一个的温度提高,以使差TB TA变得越来越大,TB温度区B的温度,和TA是温度区中的温度。

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