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    Process for the preparation of durene diisocyanate
    4.
    发明授权
    Process for the preparation of durene diisocyanate 失效
    杜烯二异氰酸酯的制备方法

    公开(公告)号：US06486346B1

    公开(公告)日：2002-11-26

    申请号：US09460953

    申请日：1999-12-14

    Applicant: Peter Heitkämper ,  Klaus Jost ,  Stefan Penninger

    Inventor： Peter Heitkämper ,  Klaus Jost ,  Stefan Penninger

    IPC: C07C27300

    CPC classification number: C07C263/10 ,  C07C265/14

    Abstract: Durene diisocyanate is prepared by reacting durene with nitric acid in sulfuric acid, catalytic hydrogenation of the dinitrodurene that is formed, and phosgenation of the resultant durene diamine in a conventional manner. The intermediate products dinitrodurene and durene diamine do not have to be worked up in a complicated manner as solid products, but can be worked up in dissolved form. The intermediate products dinitrodurene and durene diamine do not have to be isolated and purified in a complicated manner. but can be processed directly after preparation. Another advantage of this process is that only a single organic solvent need be used for the overall preparation process. Separation and re-use of spent acid in the conversion of durene with nitric acid also renders the process of the present invention significantly less environmentally harmful than the known processes of the prior art.

    Abstract translation: 杜烯二异氰酸酯是通过使杜烯与硝酸在硫酸中反应制得的，所形成的二硝基还原剂的催化氢化和所得的杜烯二胺以常规方式进行光气化。 中间产物二硝基呋喃和杜烯二胺不需要以固体产物的复杂方式处理，而可以以溶解的形式进行处理。 中间产物二硝基杜烯和杜烯二胺不需要以复杂的方式分离和纯化。 但可以在准备后直接加工。 该方法的另一个优点是在整个制备过程中仅需要使用单一的有机溶剂。 在杜烯与硝酸的转化中，废酸的分离和再利用也使得本发明的方法比现有技术的已知方法显着降低了对环境的危害。

    Urea synthesis process and apparatus
    5.
    发明授权
    Urea synthesis process and apparatus 有权
    尿素合成工艺及装置

    公开(公告)号：US06476262B2

    公开(公告)日：2002-11-05

    申请号：US09897967

    申请日：2001-07-05

    Applicant: Tadashi Fukunaka ,  Kenji Yoshimoto ,  Kenji Sakai ,  Yasuhiko Kojima

    Inventor： Tadashi Fukunaka ,  Kenji Yoshimoto ,  Kenji Sakai ,  Yasuhiko Kojima

    IPC: C07C27300

    CPC classification number: C07C273/04 ,  B01D5/0012 ,  B01J10/002 ,  B01J19/006 ,  B01J2219/00076 ,  B01J2219/00103 ,  B01J2219/00117 ,  B01J2219/00777 ,  B01J2219/185 ,  B01J2219/1943

    Abstract: Urea is prepared by reacting ammonia and carbon dioxide in an apparatus comprising a vertical condensation and synthesis column and a stripper, to provide a urea synthesis solution comprising urea, unreacted ammonia, unreacted carbon dioxide and water. The urea synthesis solution is transferred from the top of the vertical condensation and synthesis column to the top of a stripper. Carbon dioxide is introduced into the bottom of the stripper and contacted with the urea synthesis solution, thereby separating the unreacted ammonia and the unreacted carbon dioxide from the urea, and providing a mixed gas comprising ammonia, carbon dioxide and water. The mixed gas is transferred into the bottom of the vertical condensation and synthesis column, where it is reacted with liquid ammonia injected into the bottom and a middle of the vertical condensation and synthesis column. The mixed gas and liquid ammonia are condensed and react to form urea, Uncondensed gases are absorbed in an absorbing medium, which is subsequently recycled to the bottom of the vertical condensation and synthesis column.

    Abstract translation: 尿素通过在包括垂直冷凝和合成塔和汽提塔的装置中使氨和二氧化碳反应来制备，以提供包含尿素，未反应的氨，未反应的二氧化碳和水的尿素合成溶液。 尿素合成溶液从垂直冷凝和合成塔的顶部转移到汽提塔的顶部。 将二氧化碳引入汽提塔的底部并与尿素合成溶液接触，从尿素分离未反应的氨和未反应的二氧化碳，并提供包含氨，二氧化碳和水的混合气体。 将混合气体转移到垂直冷凝和合成塔的底部，在其中与注入底部的液态氨和垂直冷凝和合成塔的中间反应。 混合气体和液氨被冷凝并反应形成尿素，未冷凝的气体被吸收在吸收介质中，随后再循环到垂直冷凝和合成塔的底部。

    Method for modernizing a urea production plant
    7.
    发明授权
    Method for modernizing a urea production plant 有权
    尿素生产设备现代化的方法

    公开(公告)号：US06284922B1

    公开(公告)日：2001-09-04

    申请号：US09527221

    申请日：2000-03-16

    Applicant: Giorgio Pagani ,  Federico Zardi

    Inventor： Giorgio Pagani ,  Federico Zardi

    IPC: C07C27300

    CPC classification number: C07C273/04 ,  B01D5/0012 ,  B01D5/0081 ,  B01J19/2425 ,  B01J2219/00024 ,  B01J2219/00081 ,  B01J2219/00159 ,  Y02P20/582

    Abstract: A method for the modernization of a plant for urea production of the type comprising a reactor (2) for urea synthesis, a stripping unit (3) with carbon dioxide and at least one vertical condensation unit (4) of the film type, foresees the provision of means (36) for feeding a major portion of a flow comprising ammonia and carbon dioxide in vapor phase leaving the stripping unit (3) to the condensation unit (4) and the provision in said condensation unit (4) of means (37) for subjecting to substantially total condensation such major portion of the flow comprising ammonia and carbon dioxide in vapor phase, obtaining a flow comprising urea and carbamate in aqueous solution, then fed to the reactor (2) for urea synthesis. Thanks to the present method of modernization, the efficiency of the condensation unit (4) is remarkably improved, thus permitting an increase of its capacity.

    Abstract translation: 用于尿素生产用于尿素生产的设备的现代化方法包括用于尿素合成的反应器（2），具有二氧化碳的汽提单元（3）和膜类型的至少一个垂直冷凝单元（4），其预期为 提供用于将气流中包含氨和二氧化碳的大部分流动供给到冷凝单元（4）的装置（36），并且在所述冷凝单元（4）中提供装置（37） ），以使气相中含有氨和二氧化碳的大部分流动基本上完全冷凝，得到包含尿素和氨基甲酸酯在水溶液中的流动，然后送入反应器（2）进行尿素合成。 由于现代化的现代化方法，冷凝单元（4）的效率显着提高，从而允许其容量增加。

    Process for the integrated preparation of ammonia and urea
    8.
    发明授权
    Process for the integrated preparation of ammonia and urea 有权
    氨和尿素综合制备工艺

    公开(公告)号：US06723876B2

    公开(公告)日：2004-04-20

    申请号：US09952678

    申请日：2001-09-14

    Applicant: Christian Speth

    Inventor： Christian Speth

    IPC: C07C27300

    CPC classification number: C07C273/10 ,  C01B3/025 ,  C01B3/52 ,  C01B2203/0415 ,  C01B2203/0465 ,  C01B2203/047 ,  C01B2203/0475 ,  C01C1/0488 ,  Y02P20/52

    Abstract: Process for the combined preparation of urea and ammonia reactant by steps of providing ammonia synthesis gas containing carbon dioxide and conversion of the synthesis gas to the ammonia reactant, reacting the ammonia reactant with the carbon dioxide in the synthesis gas to ammonium carbamate and to urea product, which process comprises further steps of prior to the conversion of the synthesis gas to the ammonia reactant, (i) washing the synthesis gas with an aqueous solution of the ammonia reactant and forming a solution being rich in ammonium carbamate; (ii) removing excess of ammonia reactant from the washed synthesis gas by washing with water and withdrawing an aqueous solution of ammonia reactant; (iii) purifying the water washed synthesis gas by removing remaining amounts of water and ammonia; and (iv) passing the purified synthesis gas to the conversion of the gas to ammonia reactant.

    Abstract translation: 通过提供含有二氧化碳的氨合成气和将合成气转化为氨反应物的步骤，将氨反应物与合成气中的二氧化碳反应，使氨基甲酸铵和尿素产物 ，该方法包括在将合成气转化为氨反应物之前的进一步步骤，（i）用氨反应物的水溶液洗涤合成气并形成富含氨基甲酸铵的溶液;（ii）除去过量的 通过用水洗涤并抽出氨反应物的水溶液从洗涤的合成气中提取氨反应物;（iii）通过除去剩余量的水和氨来纯化水洗合成气; 和（iv）使纯化的合成气通过气体转化为氨反应物。

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