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    Isolation of liquid urea from the off-gas of the synthesis of melamine
    2.
    发明授权
    Isolation of liquid urea from the off-gas of the synthesis of melamine 失效
    从三聚氰胺合成废气中分离出液态尿素

    公开(公告)号：US4616094A

    公开(公告)日：1986-10-07

    申请号：US568500

    申请日：1984-01-05

    申请人： Klaus Borho ,  Dieter Fromm ,  Ernst-Juergen Schier ,  Hans H. Schneehage ,  Alfred Widmann

    发明人： Klaus Borho ,  Dieter Fromm ,  Ernst-Juergen Schier ,  Hans H. Schneehage ,  Alfred Widmann

    IPC分类号： C07C273/10 ,  C07C67/00 ,  C07C239/00 ,  C07C273/12 ,  C07C273/16 ,  C07D251/62 ,  C07C126/08

    CPC分类号： C07D251/62 ,  C07C273/12 ,  C07C273/16

    摘要： A process for isolating liquid urea and its thermal decomposition products from the off-gas of melamine synthesis, which gas has been freed from melamine by fractional condensation and then been washed with molten urea, wherein the off-gas, containing 2-10 kg of melt per kg of pure gas, is passed at 8-30 m/sec tangentially into the upper part of an axially symmetrical separation zone. As a result of the rotation imparted to the gas/liquid mixture, the two phases are separated from one another, and both pass downward through the separation zone. The gas and liquid are separately taken off at the bottom end of the separation zone. The residence time of the gas mixture in the separation zone is not less than 0.5 second.

    摘要翻译： 从三聚氰胺合成废气中分离液态尿素及其热分解产物的方法，该气体已经通过分级冷凝从三聚氰胺中脱除，然后用熔融的尿素洗涤，其中含有2-10kg 每千克纯净气体的熔体以8-30米/秒的切向通入轴向对称分离区的上部。 作为赋予气/液混合物的旋转的结果，两相彼此分离，两者都向下通过分离区。 气体和液体在分离区的底端分开脱落。 气体混合物在分离区中的停留时间不小于0.5秒。

    Isolation of pure ammonia from gas mixtures containing ammonia and carbon dioxide
    5.
    发明授权
    Isolation of pure ammonia from gas mixtures containing ammonia and carbon dioxide 失效
    从含有氨和二氧化碳的气体混合物中分离纯氨

    公开(公告)号：US4120667A

    公开(公告)日：1978-10-17

    申请号：US841552

    申请日：1977-10-12

    申请人： Hans Gettert ,  Hermann Dieter Fromm ,  Martin Molzahn ,  Ernst-Juergen Schier ,  Hans Henning Schneehage

    发明人： Hans Gettert ,  Hermann Dieter Fromm ,  Martin Molzahn ,  Ernst-Juergen Schier ,  Hans Henning Schneehage

    IPC分类号： B01D53/14 ,  C01C1/12

    CPC分类号： C01C1/12 ,  B01D53/14 ,  B01D53/1406 ,  Y02C10/06

    摘要： To isolate ammonia from gas mixtures containing ammonia and carbon dioxide, the gas mixture is first partially absorbed in a solvent, with residence times of at most 0.1 second, and the non-absorbed gas is then separated from the solution obtained. The solution is then subjected to a first desorption stage, in which only the ammonia present in an excess over a molar ratio of 3 parts of ammonia to 1 part of carbon dioxide is expelled by heating, and the entrained carbon dioxide is washed out of the expelled ammonia by means of solutions containing free ammonia. The solution remaining after the first desorption stage is substantially freed from ammonia and carbon dioxide in a second desorption stage and the expelled gas, containing solvent, together with fresh gas mixture is fed to the adsorption stage, while the solvent obtained from the second desorption stage is employed for the absorption.

    摘要翻译： 为了从含有氨和二氧化碳的气体混合物中分离氨，首先将气体混合物部分地吸收在溶剂中，停留时间至多为0.1秒，然后将非吸收气体与获得的溶液分离。 然后将溶液进行第一解吸阶段，其中只有以3份氨与1份二氧化碳的摩尔比过量存在的氨通过加热排出，并将夹带的二氧化碳从 通过含有游离氨的溶液排出氨。 在第一解吸阶段后残留的溶液在第二解吸阶段基本上不含氨和二氧化碳，并且将含有溶剂的排出气体与新鲜气体混合物一起进料到吸附阶段，而从第二解吸阶段获得的溶剂 被用于吸收。