柱形Pt-SDB催化剂的水–氢交换高处理量工艺

High Capacity Process on Liquid Catalytic Isotopic Exchange of H2O-H2 with Pt-SDB as Cylindrical Catalyst

摘要:研究了基于柱形Pt-SDB催化剂的水–氢催化交换工艺, 进行了柱形Pt-SDB催化剂的流体力学性能实验并讨论了填料规格、填料催化剂装填比、反应温度、气液比、处理量等对水–氢交换传质单元高度和传质系数的影响。结果表明,催化活性较低的柱形Pt-SDB催化剂,具有液泛气速高、持液量稳定、单位床层高度压降低等优点;柱形Pt-SDB催化剂水–氢催化交换的高处理量工艺条件为θ环填料与催化剂填装比例1:1、反应温度70℃~75℃、气液比1:1、空塔气速0.3 m/s。

The process conditions are experimentally studied for H2O-H2 liquid catalytic isotopic exchange with Pt-SDB as hydrophobic cylindrical catalyst, and hydrodynamic experiments are conducted for obtaining the correlating expressions of pressure drop △P/Z, flooding gas velocity uF. The results indicate that the Pt-SDB cylindrical catalyst with little catalytic activity has a number of advantages, including low pressure drop, higher flooding gas velocity and stable liquid holdup. The height of transfer unit (HTU) is also changed to be higher with the increasing of the air velocity in empty tower and the packing dimension. The efficiency of catalytic exchange reaction is high with a packing ratio of 1:1 of hydrophilic packing and hydrophobic catalyst in separated layers. The HTU decreases with increasing operating temperature, but the trend is slowed down when the temperature is above 70?C. The HTU increases with increasing hydrogen flow rate and decreases with increasing diluted heavy water flow rate. When the air velocity of empty tower is 0.3 m/s, the process capacity is higher.