Process for the production of 4-chloro-butanals
    1.
    发明授权
    Process for the production of 4-chloro-butanals 失效
    生产4-氯丁醛的方法

    公开(公告)号:US4691062A

    公开(公告)日:1987-09-01

    申请号:US921474

    申请日:1986-10-22

    CPC分类号: C07C45/515

    摘要: 4-chloro-butanals of the formula ##STR1## where R is hydrogen or a straight or branched chain alkyl group of 1 to 4 carbon atoms are produced by reacting the corresponding 1,1-dimethoxy-4-hydroxybutane at a temperature between -20.degree. and +80.degree. C. in the presence of triphenylphosphine with carbon tetrachloride and hydrolyzing the 1,1-dimethoxy-4-chloro-butane obtained in acid medium.

    摘要翻译: 其中R是氢或1-4个碳原子的直链或支链烷基的式“IMAGE”的4-氯丁醛通过相应的1,1-二甲氧基-4-羟基丁烷在-20℃ DEG和+ 80℃,在三苯基膦与四氯化碳的存在下,并在酸性介质中得到的1,1-二甲氧基-4-氯 - 丁烷水解。

    Process for the producing 2,5-dimethoxytetrahydrofuran and
2,5-diethoxytetrahydrofuran
    4.
    发明授权
    Process for the producing 2,5-dimethoxytetrahydrofuran and 2,5-diethoxytetrahydrofuran 失效
    制备2,5-二甲氧基四氢呋喃和2,5-二乙氧基四氢呋喃的方法

    公开(公告)号:US4680420A

    公开(公告)日:1987-07-14

    申请号:US936296

    申请日:1986-12-01

    IPC分类号: C07D307/20

    CPC分类号: C07D307/20

    摘要: A process is described for producing 2,5-dimethoxytetrahydrofuran and 2,5-diethoxytetrahydrofuran by treating 4,4-dimethoxy-1-butanal and 4,4-diethoxy-1-butanal with a strongly acidic ion exchange resin at a temperature of between 0.degree. and 70.degree. C.

    摘要翻译: 描述了通过在强酸性离子交换树脂之间的温度下处理4,4-二甲氧基-1-丁醛和4,4-二乙氧基-1-丁醛来制备2,5-二甲氧基四氢呋喃和2,5-二乙氧基四氢呋喃的方法, 0℃和70℃

    Method for preparation of acetals
    5.
    发明授权
    Method for preparation of acetals 失效
    缩醛的制备方法

    公开(公告)号:US4579979A

    公开(公告)日:1986-04-01

    申请号:US694371

    申请日:1985-01-24

    CPC分类号: C07C41/56 C07C41/58

    摘要: A method of preparation for acetals utilizing saturated or unsaturated aldehydes, in particular, the preparation of dimethylacetals of acetaldehyde, acrolein and methacrolein. The production of the acetal takes place in a liquid phase in the presence of a solid acid catalyst, such as a strongly acidic ion exchange resin or zeolite. The conversion mixture is extracted by means of water and by means of water insoluble organic solvents. There is obtained not only the desired acetals, but in addition also the unconverted initial quantities of the starting materials by a simple method and with very good yields.

    摘要翻译: 一种制备使用饱和或不饱和醛的缩醛的方法,特别是制备乙醛,丙烯醛和甲基丙烯醛的二甲缩醛。 在固体酸催化剂如强酸性离子交换树脂或沸石的存在下,缩醛的生产在液相中进行。 转化混合物通过水和水不溶性有机溶剂萃取。 不仅获得所需的缩醛,而且通过简单的方法获得起始原料的未转化的初始量,并获得非常好的收率。

    Process for the preparation of propylene oxide
    9.
    发明授权
    Process for the preparation of propylene oxide 失效
    环氧丙烷的制备方法

    公开(公告)号:US4113747A

    公开(公告)日:1978-09-12

    申请号:US678822

    申请日:1976-04-28

    IPC分类号: C07C409/24 C07D301/14

    摘要: Process for continuous production of propylene oxide (FIG. 1) from propylene and aqueous hydrogen peroxide. The aqueous hydrogen peroxide is first reacted with propionic acid in the presence of acid catalyst to form perpropionic acid (1). The perpropionic acid is taken up by extraction in benzene (5 , 12), and following drying of the benzene solution (16), the perpropionic acid in the solution is reacted with propylene (18) for oxidation of the propylene to propylene oxide and conversion of the perpropionic acid back to propionic acid. The reaction mixture is worked up to separate propylene oxide, propionic acid and benzene (25, 27, 31, 33), and the latter two are recycled. In the benzene extraction (5, 12), an aqueous raffinate (7) is formed containing hydrogen peroxide and acid catalyst. Water is removed from the aqueous raffinate (8) and the concentrate is recycled to the propionic acid reactor. Make-up hydrogen peroxide can be added to the aqueous raffinate before the removal of water.

    摘要翻译: 从丙烯和过氧化氢水溶液连续生产环氧丙烷(图1)的方法。 过氧化氢水溶液首先在酸催化剂存在下与丙酸反应形成过丙酸(1)。 通过在苯(5,12)中萃取,过丙酸被吸收,然后在苯溶液(16)干燥后,将溶液中的过丙酸与丙烯(18)反应,将丙烯氧化成环氧丙烷并转化 的过丙酸回到丙酸。 处理反应混合物以分离环氧丙烷,丙酸和苯(25,27,31,33),后两者被再循环。 在苯提取(5,12)中,形成含有过氧化氢和酸催化剂的残液水溶液(7)。 水从残液(8)中除去,浓缩物再循环到丙酸反应器中。 在除去水之前,可以将补充过氧化氢加入含水残液中。