(179a) Periodic Cycled Separation Using Cops Trays
Previously we have compared separation factors and column efficiencies for a column stripping ammonia from water with air, using three different sets of internals: Conventional sieve trays, Sulzer BX gauze packings and periodically cycled trays. The periodic trays are advantageous compared to their predecessors. For different ratios of countercurrent vapor/liquid flow rates, column efficiencies are two times greater for periodically cycled columns than for columns with sieve trays. Depending upon the holdup and gas flow, the tray efficiency of a single periodic tray can be up to 300 % of an ideal stage.
In this communication we have explored operation at higher hold-up-to-gas-flow ratios, in order to obtain evenÂ higher column efficiencies. Also, the influence of carbon dioxide on pH measurement - central to the data logging procedure â?? are investigated. Also, aspects of design of period times are investigated.