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    • 6. 发明授权
    • Preparation of conjugated dienes
    • 共轭二烯的制备
    • US5264644A
    • 1993-11-23
    • US14058
    • 1993-02-05
    • Ian D. HudsonGraham J. Hutchings
    • Ian D. HudsonGraham J. Hutchings
    • B01J23/16C07C1/207C07C1/24
    • C07C1/24B01J23/16C07C1/207C07C2527/167
    • 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.degree. to 450.degree. 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.
    • 本发明涉及一种通过使用含有方石英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。 出乎意料的是,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合理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。