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    • 5. 发明申请
    • METHOD AND APPARATUS FOR N20-MEDIATED OXIDATIVE DEHYDROGENATION OF ALKANES TO ALKENES OVER IRON ZEOLITES
    • 用于N2O介导的氧化脱氢的方法和装置通过铁沸石来烷基化
    • WO2005105711A1
    • 2005-11-10
    • PCT/NO2004/000125
    • 2004-04-30
    • YARA INTERNATIONAL ASAPÉREZ-RAMÍREZ, JavierGALLARDO-LLAMAS, Amalia
    • PÉREZ-RAMÍREZ, JavierGALLARDO-LLAMAS, Amalia
    • C07C5/42
    • C07C5/42C07C11/06
    • Steam-activated Fe-zeolites are highly efficient catalysts for the oxidative dehydrogenation of propane using N 2 0, with initial propene yields up to 25% at 723-773 K, but they deactivate due to coking. Since catalyst deactivation is reversible, a cyclically-operated process for continuous propene production, with alternation of reaction and regeneration cycles, has been developed. In order to rationally design the sequence in the cyclic experiments, a tapered element oscillating microbalance (TEOM) coupled to on-line analysis of products has been applied. The TEOM provides information on activity, deactivation, and regeneration by simultaneous measurement of reaction and mass changes. In a system with two fixed-bed reactors in parallel using FeZSM-5, stable propene yields >20% have been demonstrated during cycling for 1000 min, using reaction and regeneration temperatures of 723 K and 823 K, respectively. This novel catalytic process leads to the simultaneous valorization of C 3 H 8 and N 2 0 and can be economically applied in tail-gases of processes where N 2 0 is produced in high concentration, including the manufacture of adipic acid, caprolactam, glyoxal, and in general organic syntheses using nitric acid as the oxidant or processes involving ammonia oxidation.
    • 蒸汽激活的Fe-沸石是使用N2O对丙烷进行氧化脱氢的高效催化剂,初始丙烯在723-773K时产率高达25%,但是它们由于焦化而失活。 由于催化剂失活是可逆的,已经开发了具有交替的反应和再生循环的连续丙烯生产的循环操作方法。 为了合理设计循环实验中的顺序,已经应用了耦合到产品在线分析的锥形元件振荡微量天平(TEOM)。 TEOM通过同时测量反应和质量变化来提供有关活动,停用和再生的信息。 在使用FeZSM-5的两个固定床反应器的系统中,使用723K和823K的反应和再生温度分别在循环1000分钟期间证明稳定丙烯产率> 20%。 这种新型催化过程导致C3H8和N20的同时增值,可以经济地应用于高浓度生产N20的方法的尾气中,包括己二酸,己内酰胺,乙二醛的制备,一般使用硝酸的有机合成 酸作为氧化剂或涉及氨氧化的方法。