The Kynar PVDF bubble caps are part of bubble-cap-tray assemblies used in a distillation column for low-temperature and low-pressure (P/T) applications. In bubble cap trays, vapor flowing up through the tower contacts the liquid by passing through the bubble caps. Each bubble-cap assembly consists of a riser and a cap. The vapor rising through the column passes up through the riser in the tray floor and then is turned downward to bubble into the liquid surrounding the cap. Due to their design, bubble cap trays cannot weep or leak distilled liquid. This design is suitable for yield in lower-pressure and lower-temperature conditions. However, the bubble cap needs to be designed and manufactured with extreme care to ensure that each bubble cap operates at the same efficiency factor. Thus, bubble caps are required to be exactly identical, with the same dimensional tolerances.
