Method for minimizing ammonia slip from SCR catalysts
    1.
    发明授权
    Method for minimizing ammonia slip from SCR catalysts 有权
    从SCR催化剂最小化氨滑移的方法

    公开(公告)号:US08820050B2

    公开(公告)日:2014-09-02

    申请号:US13523054

    申请日:2012-06-14

    IPC分类号: F01N3/20

    摘要: Embodiments for reducing ammonia slip are provided. In one example, a method for reduction of ammonia emissions from an engine exhaust gas aftertreatment device with an SCR catalyst comprises determining a concentration of NOx and/or ammonia in the exhaust gas aftertreatment device, comparing a determined value of NOx and/or ammonia concentration with a nominal value for NOx and ammonia, respectively, and if an actual or shortly forecasted ammonia concentration is above the respective nominal value, triggering engine conditions with higher exhaust NOx concentration. In this way, ammonia slip may be reduced without degrading fuel economy.

    摘要翻译: 提供了用于减少氨滑移的实施例。 在一个实例中,使用SCR催化剂从发动机废气后处理装置中减少氨排放的方法包括确定废气后处理装置中的NOx和/或氨的浓度,比较确定的NOx和/或氨浓度值 分别具有NOx和氨的标称值,如果实际或短期预测的氨浓度高于相应的标称值,则触发具有较高废气NOx浓度的发动机状态。 以这种方式,可以减少氨的滑移,而不降低燃料经济性。

    Process for the preparation of alkanediol
    5.
    发明授权
    Process for the preparation of alkanediol 有权
    制备链烷二醇的方法

    公开(公告)号:US07145045B2

    公开(公告)日:2006-12-05

    申请号:US10820516

    申请日:2004-04-08

    IPC分类号: C07C27/00

    CPC分类号: C07C29/12 C07C31/205

    摘要: The invention relates to a process for the preparation of alkanediol, which process involves (a) contacting alkylene oxide with carbon dioxide in the presence of catalyst to obtain a first liquid reaction mixture containing cyclic carbonate, (b) optionally removing carbon dioxide and/or alkylene oxide, (c) increasing the pressure of the liquid reaction mixture obtained in step (a) and/or (b), (d) contacting the pressurized first reaction mixture obtained in step (c) with water in the presence of catalyst to obtain a second reaction mixture containing alkanediol and carbon dioxide, (e) separating the second reaction mixture into a liquid effluent and a gaseous effluent containing carbon dioxide, and (f) recycling at least part of the gaseous effluent containing carbon dioxide to step (a),in which process the pressure in step (d) is higher than the pressure in step (a).

    摘要翻译: 本发明涉及一种制备链烷二醇的方法,该方法涉及(a)在催化剂存在下使烯化氧与二氧化碳接触,以获得含有环状碳酸酯的第一液体反应混合物,(b)任选除去二氧化碳和/或 环氧烷,(c)增加步骤(a)和/或(b)中获得的液体反应混合物的压力,(d)使步骤(c)中获得的加压第一反应混合物与催化剂存在下的水接触, 获得含有链烷二醇和二氧化碳的第二反应混合物,(e)将第二反应混合物分离成液体流出物和含二氧化碳的气态流出物,和(f)将至少部分含二氧化碳的气态流出物再循环到步骤(a ),其中步骤(d)中的压力高于步骤(a)中的压力。

    Exhaust-gas aftertreatment system
    7.
    发明授权
    Exhaust-gas aftertreatment system 有权
    废气后处理系统

    公开(公告)号:US08341946B2

    公开(公告)日:2013-01-01

    申请号:US12569755

    申请日:2009-09-29

    申请人: Jan Harmsen

    发明人: Jan Harmsen

    IPC分类号: F01N3/00 F01N1/00

    摘要: An exhaust-gas aftertreatment system for exhaust gases of an internal combustion engine. In one example, a portion of the engine exhaust gases goes to the particulate filter and the other portion of engine exhaust gases goes to the catalyst element. The outlet of the filter element is directed to the inlet of the catalyst element and the outlet of the catalyst element is directed to the inlet of the filter element. Thus, the engine exhaust gases are filtered and processed by a catalyst.

    摘要翻译: 一种用于内燃机废气的废气后处理系统。 在一个示例中,一部分发动机废气进入颗粒过滤器,而另一部分发动机废气进入催化剂元件。 过滤元件的出口被引导到催化剂元件的入口,并且催化剂元件的出口被引导到过滤元件的入口。 因此,发动机废气被催化剂过滤和处理。

    Combined exhaust gas aftertreatment device
    8.
    发明授权
    Combined exhaust gas aftertreatment device 有权
    组合废气后处理装置

    公开(公告)号:US08202484B2

    公开(公告)日:2012-06-19

    申请号:US12553363

    申请日:2009-09-03

    申请人: Jan Harmsen

    发明人: Jan Harmsen

    IPC分类号: B01D50/00

    摘要: The description relates to an exhaust gas purification system for exhaust gases that are emitted from an internal combustion engine, in particular a diesel engine. In one embodiment, exhaust gases from the engine are separated into two streams. The two exhaust streams are processed differently so as to take advantage of different attributes of different aftertreatment devices.

    摘要翻译: 本说明书涉及从内燃机特别是柴油发动机排出的排气净化系统。 在一个实施例中,来自发动机的废气被分成两股。 对两个废气流进行不同处理,以利用不同后处理装置的不同属性。