Preparation of conjugated dienes
    4.
    发明公开
    Preparation of conjugated dienes 失效
    Verfahren zur Herstellung von konjugierten Dienen。

    公开(公告)号:EP0463748A1

    公开(公告)日:1992-01-02

    申请号:EP91304959.9

    申请日:1991-05-31

    摘要: The invention relates to a process for the preparation of a conjugated diene from the corresponding carbonyl compound having the same number of carbon atoms by dehydration at a temperature of 300° to 450°C using a catalyst comprising aluminium phosphate having the cristobalite structure.
    This catalyst is superior to aluminium phosphate having the tridymite structure in the dehydration of carbonyl compounds and has advantages over boron phosphate catalysts. Using the process, isoprene may be prepared from 2-methyl butanal and/or methyl isopropyl ketone in high yields.
    Unexpectedly aluminium phosphate having the cristobalite structure is markedly superior to boron phosphate in converting methyl isopropyl ketone, which is an intermediate product formed in appreciable amounts in the dehydration of 2-methyl butanal to isoprene. This superiority significantly improves the process economics of the conversion reaction of 2-methyl butanal to isoprene.

    摘要翻译: 本发明涉及一种通过使用具有方英石结构的磷酸铝的催化剂在300-450℃的温度下通过脱水从具有相同碳原子数的相应羰基化合物制备共轭二烯的方法。 该催化剂优于在羰基化合物脱水中具有鳞石英结构的磷酸铝,并且具有优于硼酸盐催化剂的优点。 使用该方法,异戊二烯可以以高产率从2-甲基丁醛和/或甲基异丙基酮制备。 意外的是,在转化甲基异丙基酮时,具有方英石结构的磷酸铝显着优于磷酸氢盐,甲基异丙基酮是在2-甲基丁醛脱水至异戊二烯中以明显的量形成的中间产物。 这种优势显着提高了2-甲基丁醛与异戊二烯的转化反应的工艺经济性。

    PROCESS FOR CO-PRODUCING C3 OLEFINS, IC4 OLEFINS, NC4 OLEFINS AND DIOLEFINS, AND/OR C5 OLEFINS AND DIOLEFINS
    5.
    发明公开
    PROCESS FOR CO-PRODUCING C3 OLEFINS, IC4 OLEFINS, NC4 OLEFINS AND DIOLEFINS, AND/OR C5 OLEFINS AND DIOLEFINS 审中-公开
    共生C3烯烃,四烯烃,NC4烯烃和二烯烃和/或C5烯烃和二烯烃的方法

    公开(公告)号:EP3230237A1

    公开(公告)日:2017-10-18

    申请号:EP15868355.7

    申请日:2015-10-27

    摘要: Processes and systems for producing olefins, including: dehydrogenating a first n-alkane to produce a first effluent; and dehydrogenating at least one of a first isoalkane or a second n-alkane to produce a second effluent. The first and second effluents may be compressed and fed to a common separation train to separate the effluents into two or more fractions. In some embodiments, each of the first and second dehydrogenation reaction zones may include two reactors, one reactor in each of the reaction zones operating in a dehydrogenation cycle, one operating in a regeneration cycle, and one operating in a purge or evacuation/reduction cycle. Operation of the reactors in the dehydrogenation cycle is staggered, such that the purge cycle, regeneration cycle, or evacuation/reduction cycle of the reactors may not overlap.

    摘要翻译: 用于生产烯烃的方法和系统,包括:使第一正构烷烃脱氢以产生第一流出物; 和使第一异烷烃或第二正烷烃中的至少一种脱氢以产生第二流出物。 第一和第二流出物可以被压缩并供给到共同的分离列以将流出物分离成两个或更多个馏分。 在一些实施方案中,第一脱氢反应区和第二脱氢反应区中的每一个可以包括两个反应器,在脱氢循环中操作的每个反应区中的一个反应器,一个在再生循环中操作的反应器,以及在清洗或抽空/ 。 反应器在脱氢循环中的操作是交错的,使得反应器的吹扫循环,再生循环或抽空/还原循环可能不重叠。