利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

2 条记录 (耗时 0.008 秒)

    METHOD FOR REDUCING EMISSIONS FROM EVAPORATIVE EMISSIONS CONTROL SYSTEMS
    1.
    发明公开
    METHOD FOR REDUCING EMISSIONS FROM EVAPORATIVE EMISSIONS CONTROL SYSTEMS 有权
    方法，系统和罐体减排控制系统蒸汽排放形

    公开(公告)号：EP1446569A1

    公开(公告)日：2004-08-18

    申请号：EP02748109.2

    申请日：2002-07-08

    申请人： Meadwestvaco Corporation

    发明人： Hiltzik, Laurence H. ,  Jagiello, Jacek Z. ,  Tolles, Edward D. ,  Williams, Roger S.

    IPC分类号： F02M25/08 ,  B01D53/04

    CPC分类号： B01D53/02 ,  B01D2253/102 ,  B01D2253/104 ,  B01D2253/108 ,  B01D2253/11 ,  B01D2253/342 ,  B01D2259/4145 ,  B01D2259/4516 ,  F02M25/0854 ,  Y10S95/90

    摘要： Disclosed is a method for sharply reducing diurnal breathing loss emissions from automotive evaporative emissions control systems by providing multiple layers, or stages, of adsorbents. On the fuel source-side of an emissions control system canister, high working capacity carbons are preferred in a first canister (adsorb) region. In subsequent canister region(s) on the vent-side, the preferred adsorbent should exhibit a flat or flattened adsorption isotherm on a volumetric basis and relatively lower capacity for high concentration vapors as compared with the fuel source-side adsorbent. Multiple approaches are described for attaining the preferred properties for the vent-side canister region. One approach is to use a filler and/or voidages as a volumetric diluent for flattening an adsorption isotherm. Another approach is to employ an adsorbent with the desired adsorption isotherm properties and to process it into an appropriate shape or form without necessarily requiring any special provision for dilution. The improved combination of high working capacity carbons on the fuel source-side and preferred lower working capacity adsorbent on the vent-side provides substantially lower diurnal breathing emissions without a significant loss in working capacity or increase in flow restriction compared with known adsorbents used in canister configurations for automotive emissions control systems.