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    • 86. 发明授权
    • Combination pretreatment/adsorption for treating a liquid stream contaminated with an iodine-containing compound
    • 用于处理受含碘化合物污染的液态物流的组合预处理/吸附
    • US06506935B1
    • 2003-01-14
    • US09905454
    • 2001-07-13
    • Santi KulprathipanjaBipin V. VoraWilliam A. Leet
    • Santi KulprathipanjaBipin V. VoraWilliam A. Leet
    • C07C5142
    • C07B63/00C07C51/47
    • For the removal of trace quantities of iodine-containing contaminants from corrosive liquid feed streams (e.g. commercial acetic acid), an adsorbent with distinct advantages over prior-art materials is provided. The overall treatment method involves the use of a suitable zeolite having a silica to alumina molar ratio from about 5 to less than 15 that has been cation-exchanged with an iodine-reactive metal. This inorganic adsorbent may be used in unbound form, or it can be bound with a substantially insoluble porous inorganic refractory metal oxide binder. Reactivation and regeneration techniques, which are generally incompatible with prior-art adsorbent materials, are also disclosed. In general, it is advantageous to pretreat the feed streams to remove the most easily separable contaminants (e.g. iodine, hydrogen iodide, and metal cations) and thereby reduce the iodine compound loading and detrimental effects of metals on the adsorbent. Thus, the expensive iodine reactive metal (e.g. silver) used in the adsorbent preparation is judiciously used for the removal of trace quantities of iodine-containing species (e.g. alkyl iodides) that are not readily separable by other means.
    • 为了从腐蚀性液体进料流(例如商业乙酸)中除去痕量的含碘污染物,提供了与现有技术材料相比具有明显优点的吸附剂。 总体处理方法包括使用与碘反应性金属进行阳离子交换的具有约5至小于15的二氧化硅与氧化铝摩尔比的合适的沸石。 该无机吸附剂可以以未结合的形式使用,也可以与基本上不溶的多孔无机难熔金属氧化物粘合剂结合。 还公开了通常与现有技术吸附材料不相容的再活化和再生技术。 通常,有利的是预处理进料流以除去最容易分离的污染物(例如碘,碘化氢和金属阳离子),从而降低碘化合物的负载量和金属对吸附剂的不利影响。 因此,在吸附剂制备中使用的昂贵的碘反应性金属(例如银)被明智地用于除去不易通过其它方法分离的痕量的含碘物质(例如烷基碘化物)。
    • 90. 发明授权
    • Adsorptive separation of para-xylene with high boiling desorbents
    • 对二甲苯与高沸点脱附剂的吸附分离
    • US5495061A
    • 1996-02-27
    • US320343
    • 1994-10-11
    • Santi Kulprathipanja
    • Santi Kulprathipanja
    • C07C7/13C07C7/12
    • C07C7/13
    • The cost of separating para-xylene from other xylene isomers and C.sub.9 aromatics by adsorption on zeolitic molecular sieves is reduced by the use of certain relatively high boiling desorbents including 1,4 diisopropylbenzene. Preferably the adsorbent is an X zeolite adsorbent containing barium or both barium and potassium ions at exchangeable cationic sites. The para-xylene components are selectively adsorbed onto the adsorbent. The non-adsorbed feed is then removed from the adsorbent and the para-xylene recovered by desorption. Any C.sub.9 aromatic hydrocarbons and the other xylene isomers in the raffinate can be separated from these heavy desorbents by fractionation of the raffinate and the desorbent can be recycled to the process.
    • 通过使用某些相对高沸点的脱附剂(包括1,4-二异丙苯),降低了通过吸附沸石分子筛将对二甲苯与其它二甲苯异构体和C9芳烃分离的成本。 优选地,吸附剂是在可交换的阳离子位点含有钡或两者的钡和钾离子的X沸石吸附剂。 对二甲苯组分选择性地吸附到吸附剂上。 然后从吸附剂中除去未吸附的进料,通过解吸回收对二甲苯。 萃余液中的任何C 9芳族烃和其他二甲苯异构体可以通过萃余液的分馏从这些重质脱附剂中分离出来,并且脱附剂可以再循环到该方法中。