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    • 1. 发明授权
    • Preparation of peracid by liquid-liquid extraction
    • 通过液 - 液萃取制备过酸
    • US4325888A
    • 1982-04-20
    • US151817
    • 1980-05-21
    • Anthony M. Hildon
    • Anthony M. Hildon
    • B01D11/04C07C409/24C07C409/26C07C179/10
    • B01D11/04C07C407/00C07C407/003
    • The invention provides a process and apparatus for liquid-liquid extraction in which a first liquid phase is passed continuously through a series of extraction stages (10) while a second liquid phase is passed continuously through the series in counter-current to the first phase. In each stage the second phase is dispersed as by a sieve plate (11) and then allowed to coalesce into a settled body (14) from which the second phase is withdrawn and passed to the next adjacent stage. The invention is characterized by the fact that the flows of the two phases in each stage are generally transverse to each other. Preferably the first phase flows through the series of stages under gravity while the second phase is pumped (16) from stage to stage to control its inter-stage transfer.The invention combines the features of separate control of residence time characteristics of an extraction column with the safety aspects inherent in a mixer/settler battery.
    • 本发明提供了一种用于液 - 液萃取的方法和装置,其中第一液相连续通过一系列萃取级(10),而第二液相通过与第一相逆流连续通过该级串联。 在每个阶段中,第二阶段通过筛板(11)分散,然后使其聚结成沉降体(14),第二阶段从其中取出并传递到下一相邻阶段。 本发明的特征在于,每个阶段中的两相的流动通常彼此横向。 优选地,第一阶段在重力作用下流过一系列阶段,而第二阶段从阶段泵送到阶段(16)以控制其阶段间转移。 本发明将提取塔的停留时间特性的单独控制的特征与混合器/沉降池电池中固有的安全方面相结合。
    • 4. 发明授权
    • Process for the preparation of organic solutions of percarboxylic acids
    • US4088676A
    • 1978-05-09
    • US678825
    • 1976-04-28
    • Willi HofenGunter PrescherGerd SiekmannGunter Wolf
    • Willi HofenGunter PrescherGerd SiekmannGunter Wolf
    • B01D3/00C07C67/00C07C407/00C07C409/24C07C409/26C07C179/10
    • C07C409/24C07C407/00C07C407/003Y10S203/06
    • A process for the continuous preparation of organic solutions of percarboxylic acids by reaction of an aqueous solution of hydrogen peroxide with the corresponding carboxylic acid in the presence of an acid, water-soluble catalyst which boils above 160.degree. C., extraction of the percarboxylic acid from the resulting reaction mixture using an organic solvent which is immiscible with water, reconcentration of the raffinate, which essentially contains hydrogen peroxide and the acid catalyst, by distilling off water in a distillation column and recycle of the raffinate, concentrated in this way, into the reaction with the carboxylic acid. The raffinate is divided into two partial streams in a ratio of 1 to 25:1. The raffinate is fed to a distillation column which is operated under reduced pressure and which has at least two take-off weirs as tray inserts, the first take-off weir being at least two theoretical plates above the sump phase, the second take-off weir being arranged at least two theoretical plates above the first take-off weir and the section of column between the second take-off weir and the top of the column having at least two theoretical plates. The larger partial stream of the raffinate is passed into the column below the first take-off weir and the smaller partial stream is passed into the column below the second take-off weir. Water is removed at the top of the distillation column. A first side stream, which essentially contains the hydrogen peroxide from the small partial stream of the raffinate from the extraction, is withdrawn from the second take-off weir and is a 2 to 40% strength by weight aqueous solution of hydrogen peroxide, which is optionally fed, together with the larger partial stream of the raffinate from the extraction, into the column below the first take-off weir. A second side stream is withdrawn from the first take-off weir and is an aqueous solution of the acid catalyst which optionally can be further worked up and re-used. The re-concentrated aqueous solution of hydrogen peroxide and acid catalyst, withdrawn as a sump product from the distillation, is recycled into the reaction with carboxylic acid. A third side stream can be taken from a third take-off weir which is arranged not more than 2 theoretical plates below the first take-off weir.The following applications are related to the process hereof for production of propylene oxide as being directed to aspects of the process, some of which are disclosed herein.______________________________________ German Serial U.S. Atty's Docket U.S. Serial No. No. No. ______________________________________ P 25 19 288.5 Bayer 2883 678,819 P 25 19 300.4 Bayer 2884 678,820 P 25 19 299.8 Bayer 2885 678,821 P 25 19 298.7-42 Bayer 2886 678,822 P 25 19 297.6 Bayer 2887 678,823 P 25 19 295.4 Bayer 2888 678,824 P 25 19 292.1-42 Bayer 2890 678,826 P 25 19 291.0-42 Bayer 2891 678,827 P 25 19 289.6 Bayer 2892 678,828 P 25 19 297.4 Bayer 2893 678,829 ______________________________________ All of the German applications were filed Apr. 30, 1975. Those applications are incorporated herein by reference.