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    Process for the production of the dinitrogen tetroxide
    1.
    发明授权
    Process for the production of the dinitrogen tetroxide 失效
    生产四氯化钛的方法

    公开(公告)号：US3607028A

    公开(公告)日：1971-09-21

    申请号：US3607028D

    申请日：1968-12-18

    Applicant: CHEMIE LINZ AG

    Inventor： SCHMIDT ALFRED ,  WEINROTTER FERDINAND ,  MULLER WALTER ,  BOHLER WALTER

    IPC: C01B21/36

    CPC classification number: C01B21/36

    Abstract: Dinitrogen tetroxide is produced by a catalytic oxidation of ammonia with air at atmospheric pressure followed by oxidation of the resultant nitrogen oxides by 50 to 70 percent HNO3. This increases the concentration of NO2 and results in formation of dilute HNO3. The NO2 is cooled and condensed by compression to at least four atmospheres at temperatures not below 8* C. to produce dinitrogen tetroxide in liquid phase and nitrogen dioxide in vapor phase. The latter is reacted with an excess of oxygen in the presence of the dilute nitric acid in the preceding step to produce nitric acid of 50 to 70 percent concentration which may be recycled to the step wherein the nitric oxide is oxidized by nitric acid. By the present process, the use of expensive and difficult-to-operate nitric acid concentrators is avoided.

    Apparatus for the continuous dehydration of aluminum fluoride hydrates
    3.
    发明授权
    Apparatus for the continuous dehydration of aluminum fluoride hydrates 失效
    连续去除氟化氢水凝胶的设备

    公开(公告)号：US3617038A

    公开(公告)日：1971-11-02

    申请号：US3617038D

    申请日：1969-11-18

    Applicant: CHEMIE LINZ AG

    Inventor： SCHMIDT ALFRED ,  WEINROTTER FERDINAND ,  GLOTZL ROLAND ,  STAUDIGL RUDOLF

    IPC: C01F7/50 ,  F27B15/00

    CPC classification number: C01F7/50

    Abstract: Apparatus for the continuous dehydration of aluminum fluoride hydrates consisting of a fluidized-bed furnace with a cylindrical furnace jacket and a perforated plate just above the base, a lid to which gas-heated jacket radiant tubes are fixed reaching vertically almost to the said plate each of the tubes being closed at one end and having a concentric inner tube with a burner in the interior and being of almost the same length as the jacket radiant tube as well as open at the bottom so that combustion gas issuing from said burner in the interior of said inner tube flows upward in the tip of the outer tube after a change of direction of 180*. Thus both the fluidized bed outside the jacket radiant tube and, via a recuperator, the air passed to the burner are warmed.

    Process for the production of malic acid
    5.
    发明授权
    Process for the production of malic acid 失效
    苹果酸生产工艺

    公开(公告)号：US3875222A

    公开(公告)日：1975-04-01

    申请号：US37488773

    申请日：1973-06-29

    Applicant: CHEMIE LINZ AG

    Inventor： WEINROTTER FERDINAND ,  SCHMIDT ALFRED ,  GAUSTER WOLFGANG

    IPC: C07C51/48 ,  C07C59/12

    CPC classification number: C07C51/48 ,  C07C59/245

    Abstract: Pure malic acid is prepared by treating a crude malic acid solution in a liquid-liquid extraction with an organic solvent which is immiscible with the malic acid solution and possesses good solvent power for maleic acid and fumaric acid, but in which the malic acid is so much less soluble that the distribution coefficient Dc Cwater/Csolvent of malic acid bears a ratio of at least 4:1 to that of maleic acid, and subsequently isolating the malic acid from the purified solution.

    Abstract translation: 通过用与苹果酸溶液不混溶的有机溶剂处理液 - 液萃取中的粗苹果酸溶液制备纯苹果酸，并且对马来酸和富马酸具有良好的溶剂能力，但其中苹果酸是如此 苹果酸的分配系数Dc = C water / Csolvent与马来酸的比例至少为4:1，并且随后从纯化溶液中分离出苹果酸，溶解度很低。

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