Pall Corporation

Nelson J Sobel

Jeffrey M Seibert

Glen E Petaja

Peter M O'Connell

Lawrence D Weber

Daniel R Uhr

Gregory Collins

Disclosed is a method and apparatus for recovering iodine from an aqueous suspension. Particulate iodine is formed on a filter septum and forms a cake of solid iodine. The cake is removed by backwash with a liquid or by blowback with a gas. Contact of the iodine with the environment is minimized.

System and process for iodine recovery

The filtration system comprises a holding vessel and a filter for clarifying contaminated influent gas streams by passing the stream through the filter. The holding vessel has an inlet port for receiving the influent gas to be filtered and for draining the vessel and an outlet port for delivering the clean effluent for further processing. When the particulate matter has clogged the filter and increases the differential pressure across the filter such that it interferes with the normal filtration operation, the particulate matter is cleaned from the filter by isolating the holding vessel from the gas stream and introducing a liquid into the holding vessel and then by backwashing the liquid so that it flows through the holding vessel and the filter in the opposite direction of the influent gas. Backwashing the liquid from the holding vessel dislodges and removes the layer of solid particulate matter on the filter surface and the quantities of particulate matter trapped within the interior of the filter. In a preferred embodiment, the liquid is backwashed by introducing a controlled quantity of pressurized gas into the clean downstream side of the vessel and rapidly opening the drain port resulting in a hydraulic pulse which forces the liquid to flow through the filter in the opposite direction of the influent gas and burst the collected solids from the filter. As the gas head expands, the solids and remaining liquid in the vessel are forced through the inlet port and drain pipe for further processing.

In situ filter cleaning system for gas streams

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Cortland, NY, United States of America

Nelson J Sobel