A purge stream is a portion of a recycle stream that is withdrawn to prevent the buildup of a material that remains entirely in the recycle stream.
Not clear on how this works, or how to solve a material balance problem on a system with a purge? Check out the video above for a tutorial with an example of a system with and without a purge stream to understand the purge process.
This video tutorial is part of the LearnChemE YouTube series by the faculty of University of Colorado Boulder, Department of Chemical & Biological Engineering. If you're looking for more explanations of chemical engineering topics, from heat transfer to Microsoft Excel for ChemEs to material and energy balances, the LearnCheme series is a must. Check out the list of all chemical engineering tutorial playlists.