Patent ID: 6929678
Filing Date: 2005-08-16
Classification: B01J,G01N

Abstract:
1. A method for drying a stream of sample gas in a purge and trap concentrator, comprising: providing a gas metering system controlling a stream of sample gas during a drying interval and controlling a stream of dry gas during a regeneration interval to a dryer tube, the dryer tube having an inlet and an outlet and an interior passageway between the inlet and an outlet; placing support material comprising polymer sorbent in the interior passageway, the support material providing a support surface area; coating the support surface area with a hygroscopic coating comprising lithium chloride, the lithium chloride having a temperature; heating the dryer tube with a heater, and controlling the heater to increase the temperature of the dryer tube to between 100 and 300 degrees centigrade during the regeneration interval and controlling the heater to decrease the temperature of the dryer tube to below 100 degrees centigrade during the drying interval.