Process for preparing ketones, in particular 6-methylheptan-2-one
    13.
    发明授权
    Process for preparing ketones, in particular 6-methylheptan-2-one 失效
    制备酮的方法,特别是6-甲基庚-2-酮

    公开(公告)号:US06303823B2

    公开(公告)日:2001-10-16

    申请号:US09729459

    申请日:2000-12-05

    IPC分类号: C07C4573

    摘要: A process for preparing ketones by so-called “crossed aldol condensation” of a ketone with an aldehyde in the presence of a catalyst system consisting of approximately equimolar amounts of a secondary amine and of a carboxylic acid containing at least 2 C atoms, to form an &agr;,&bgr;-unsaturated ketone, and, where appropriate, subsequent catalytic hydrogenation. The process is used in particular for preparing 6-methyl-3-hepten-2-one by reacting acetone with isovaleraldehyde, and for preparing its hydrogenation product, 6-methylheptan-2-one, which is an important precursor for numerous active substances, in particular for preparing lipid-soluble vitamins such as vitamin E.

    摘要翻译: 在由大约等摩尔量的仲胺和含有至少2个C原子的羧酸组成的催化剂体系的存在下,通过所谓的“交叉醛醇缩合”酮与醛制备酮的方法,以形成 α,β-不饱和酮,以及适当的后续催化氢化。该方法特别用于通过丙酮与异戊醛反应制备6-甲基-3-庚烯-2-酮,并用于制备其氢化产物6 - 甲基庚-2-酮,其是许多活性物质的重要前体,特别是用于制备脂溶性维生素如维生素E.

    Continuous preparation of acetic acid esters
    17.
    发明授权
    Continuous preparation of acetic acid esters 失效
    连续制备乙酸酯

    公开(公告)号:US4370491A

    公开(公告)日:1983-01-25

    申请号:US263470

    申请日:1981-05-14

    CPC分类号: C07C67/03 Y10S203/06

    摘要: A process for the preparation of acetic acid esters CH.sub.3 --CO--O--R.sup.1 (I, R.sup.1 =an organic radical other than methyl and ethyl) by alkali-catalyzed trans-esterification of an acetic acid ester CH.sub.3 --CO--O--R.sup.2 (II, R.sup.2 =methyl or ethyl) with an alcohol R.sup.1 --OH (III), accompanied by elimination of the alcohol R.sup.2 --OH (IV), wherein(a) the trans-esterification reaction is carried out in the middle section K.sub.M of a distillation column K, the alcohol III being fed as liquid into the upper zone and the ester II into the lower zone of K.sub.M,(b) the alkaline catalyst is introduced into the upper part K.sub.U of K,(c) the alcohol IV, or a mixture of IV and the ester II, is taken off the top of the column,(d) the mixture obtained from (c) (unless the alcohol IV alone is obtained) is separated in the column section K.sub.U or in a stripper column K.sub.S into IV and the azeotrope of II and IV, and the latter is recycled to the lower zone of K.sub.M,(e) the ester I is taken as vapor or liquid from the lower zone of the lower section K.sub.L of K and(f) the catalyst is either removed, or recycled to K.sub.U, in a conventional manner.

    摘要翻译: 通过乙酸酯CH3-CO-O-R2的碱催化反式酯化制备乙酸酯CH 3 -CO-O-R 1(I,R 1 =甲基和乙基以外的有机基)的方法 II,R 2 =甲基或乙基)与醇R 1 -OH(III)反应,同时除去醇R 2 -OH(Ⅳ),其中(a)酯交换反应在 蒸馏塔K,醇III作为液体进料到上部区域,酯II进入KM的下部区域,(b)将碱性催化剂引入K的上部KU,(c)醇IV,或 将IV和酯II的混合物从柱顶部取出,(d)从(c)获得的混合物(除非单独获得醇IV)在柱部分KU或汽提塔KS中分离 进入IV和II和IV的共沸物,后者再循环到KM的下部区域,(e)将酯I作为蒸汽或液体从下部KL的下部区域中取出 的K和(f)催化剂以常规方式被去除或再循环至KU。

    Manufacture of acetals
    18.
    发明授权
    Manufacture of acetals 失效
    缩醛的制造

    公开(公告)号:US4133836A

    公开(公告)日:1979-01-09

    申请号:US801561

    申请日:1977-05-31

    摘要: A process for the manufacture of acetals by reacting aliphatic aldehydes with aliphatic alcohols, especially olefinically unsaturated aldehydes and allyl alcohols, in the presence of a distillable acid, especially nitric acid, using a rectifying column as the reaction vessel. The products may be used as starting materials for plastics, active substances, scents and vitamins.

    摘要翻译: 通过使用精馏塔作为反应容器,在可馏出的酸,特别是硝酸的存在下,使脂族醛与脂族醇,特别是烯属不饱和醛和烯丙醇反应来制造缩醛的方法。 该产品可用作塑料,活性物质,气味和维生素的起始原料。