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    • 12. 发明授权
    • Preparation of cyclopentanones
    • 环戊酮的制备
    • US5166447A
    • 1992-11-24
    • US776688
    • 1991-10-15
    • Franz MergerTom Witzel
    • Franz MergerTom Witzel
    • C07C45/60C07C49/395C07C49/523
    • C07C49/395C07C45/60C07C49/523Y02P20/582
    • Cyclopentanones of the general formula I ##STR1## where R.sup.1 and R.sup.2 are each an organic radical or R.sup.1 or R.sup.2 may be hydrogen and R.sup.3 is hydrogen or formyl, are prepared by a process in which a 2-formyl-3,4-dihydropyran of the general formula II ##STR2## where R.sup.1 and R.sup.2 have the abovementioned meanings, a) where R.sup.3 is formyl, is converted in the presence of an acidic heterogeneous catalyst at from 50.degree. to 500.degree. C., andb) where R.sup.3 is hydrogen,b.sub.1) is reacted with water or an alcohol in the presence of an acidic heterogeneous catalyst at from 100.degree. to 500.degree. C. in the gas phase orb.sub.2) a compound II or an acrolein of the general formula III ##STR3## is reacted with water or with water in the presence of an acid or with an alcohol in the presence of an acid at from 150.degree. to 400.degree. C. in the liquid phase. Novel 2-formylcyclopentanones are obtained.
    • 其中R 1和R 2各自为有机基团或R 1或R 2可以是氢并且R 3为氢或甲酰基的通式I(I)的环戊烷酮通过其中2-甲酰基-3,4 - 二氢吡喃,其中R 1和R 2具有上述含义,a)其中R 3是甲酰基,在酸性多相催化剂存在下在50-500℃下转化,和 b)其中R3是氢,b1)在酸性非均相催化剂存在下,在气相中在100-500℃下与水或醇反应,或b2)化合物II或通式为的丙烯醛 在酸的存在下,在酸的存在下,在液相中,在150℃至400℃的条件下,将III(III)化合物与水或水在酸或醇的存在下反应。 得到新的2-甲酰基环戊烷酮。
    • 13. 发明授权
    • Preparation of methacrylic acid
    • 甲基丙烯酸的制备
    • US5087744A
    • 1992-02-11
    • US213837
    • 1988-06-30
    • Richard KrabetzGerd DuembgenFranz MergerMichael JaegerFritz ThiessenHerbert Vogal
    • Richard KrabetzGerd DuembgenFranz MergerMichael JaegerFritz ThiessenHerbert Vogal
    • B01J27/19C07B63/04C07C51/00C07C51/235C07C51/25C07C57/055C07C57/07C07C67/00
    • C07C51/252
    • Methacrylic acid can be prepared with advantage by gas phase oxidation of methacrolein or isobutyraldehyde over Mo- and P-containing catalysts at from 250.degree. to 400.degree. C. with cooling of the hot reaction gas to below 100.degree. C., absorption of the methacrylic acid in a water-operated absorption column, at below 100.degree. C. and partial recycling into the oxidation reactor after admixture of methacrolein or isobutyraldehyde and oxygen by feeding a quantity of methacrolein or isobutyraldehyde equal to the quantity of methacrolein or isobutyraldehyde consumed in the reaction in liquid form together with a polymerization inhibitor into the reactor gas in the lower two-thirds of the absorber column and upstream of the feed point for the fresh methacrolein or isobutyraldehyde or down-stream of the absorption column splitting off the reactor off-gas a side stream which is washed in a wash column operated with water at
    • 甲基丙烯酸可以通过在250℃至400℃的含Mo和P的催化剂上甲基丙烯醛或异丁醛的气相氧化来制备,同时将热反应气体冷却至低于100℃,吸收甲基丙烯酸 酸在水性吸收塔中,低于100℃,并通过加入与反应中消耗的甲基丙烯醛或异丁醛的量相等的量的异丁烯醛或异丁醛,将甲基丙烯醛或异丁醛和氧气混合后,部分再循环进入氧化反应器 液体形式与聚合抑制剂一起在吸收塔的下三分之二的反应器气体中,在新鲜的甲基丙烯醛或异丁醛的进料点的上游或吸收塔的下游分离反应器废气a 侧流在洗涤塔中用水在<10℃下洗涤以除去未转化的异丁烯醛或异丁醛,其为f 作为吸收塔顶部的水溶液。