SDB疏水催化剂载体的装填及对传质性能的影响

氢-水液相催化交换(LPCE)是处理大量含氚废水的有效途径,而疏水性载体苯乙烯-二乙烯基苯共聚物(SDB)是LPCE的关键材料,对活性组分Pt起到承载作用。采用30mm×400mm玻璃柱模拟催化反应床,研究了SDB疏水性载体与填料的填装方式、气体流速、液体流速、温度以及分层装填高度等工艺条件对床层压力降和持液量的影响。结果表明:当不锈钢θ填料与SDB疏水性载体的体积比为4∶1时,无论采用混合装还是分层装,床层压力降均随气体流速、液体流速和温度的增加而升高,而动持液量随气体流速的增加而减小,随液体流速的增加而增大;混合装的压力降低于分层装,不同分层装对应的床层压力降大小为:四层装三层装一层装两层装。

Loading of SDB Hydrophobic Catalyst Carrier and Its Effects on Mass Transfer

Liquid phase catalytic exchange(LPCE) is a very efficientive method to remove small quantities of tritium from light or heavy wastewater streams,and the hydrophobic catalysts copolymer SDB acts as a carrier for active component-Pt,playing a key role in LPCE.In this paper 30 mm×400 mm glass column has been used to simulate bed catalytic reactor,and the effect of packing mode and volume ratio of SDB carrier to stainless steel θ packing on the pressure drop of column were investigated.Similarly,the effect of gas flow rate,liquid flow rate,as well as temperature on the pressure drop of column and liquid holdup were studied.The results indicate that when the packing volume ratio is 4 ∶ 1,the pressure drop of column increases with the gas and liquid flow rate,as well as the temperature,and the liquid holdup decreases with the increase of the gas flow rate,while increased with the liquid flow rate,have nothing to do with the loading mode.The pressure drop of layered packing is higher than mixed packing.For the pressure drop of different layered packing,the sort from largest to smallest is quadruple-layer＞triple-layer＞single-layer＞double-layer.