USING IN-PROCESS HEAT FLOW AND DEVELOPING TRANSFERABLEPROTOCOLS FOR THE MONITORING, CONTROL AND CHARACERIZATIONOF A FREEZE DRYING PROCESS
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United States of America Patent
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Issued Date -
Aug 13, 2015
app pub date -
Oct 29, 2014
filing date -
Feb 12, 2014
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Abstract
A method of monitoring and controlling a freeze drying process in a freeze drying apparatus having walls, shelves and a number of containers positioned on different areas of the shelves and containing product to be freeze dried. One or more product containers are selected that are representative of the positions of the product containers in different areas of the shelves. One or more heat flux sensors are positioned between the selected product containers and adjacent portions of the walls and/or shelves. The heat transfer between the selected containers and the adjacent wall or shelf portions is measured during the freezing and/or drying stages of the freeze drying process to determine critical process parameters that are used to develop or calculate freeze drying recipes, protocols and profiles that can be transferred between different freeze dryers.
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