Method and apparatus for changeover of container in a fluid dispenser

摘要

In a method and apparatus for changeover of containers of a highly soluble substance in a continuous flow process, fluid is flowed through a container of the substance to generate a solution until the substance is depleted and the concentration of the solution starts to drop. The solution from the first container is then directed through a second container containing a charge of the substance to maintain a saturated solution. When the first container is fully exhausted, the flow of fluid is switched to isolate the first container and to flow the fluid directly into the second container whereupon the first container can be safely removed. The arrangement is operated as a lead lag system with solution flowing through the containers at or close to plug flow to minimize mixing.