Since 1984, Separation Techniques' current personnel have designed over 40 operational ion exchange plants for special processes. Having been retained by the resin manufacturer Rohm & Haas (now Dow) for several years, we have worked closely as their preferred consultant engineers when designing plants for special applications in the food and pharmaceutical industries where fluid flow to and from the system was critical in determining accurate product cut-offs, reducing resin inventory, increasing throughput and reducing chemical requirements on the plant. Although the majority of if not all, ion-exchange / chromatographic plants are provided with regeneration and CIP, there are instances where we have provided plants containing catalytic resins without regeneration facilities, to be incorporated into the client's process train. These plants are on a continuous production sequence for several years.
The approach used in designing special process plant is very different from that adopted in standard water treatment in order to minimise rinse and regenerant volumes and maximise the efficiency of the plant.
Special emphasis is given to the choice of resins, process chemistry including resin cleaning procedures and the engineering design of instrumentation as well as design of the columns and their internals.