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Veritech - Process Improvement via Pinch Technology: "Introduced in the mid-1980s, pinch analysis provides a systematic approach to analyze energy networks and improve the energy performance of industrial processes. Pinch technology uses graphical representations of the energy flows in the process and utility streams to determine the minimum energy consumption a process should use to meet its specific production requirements. "
A membrane is a solid or liquid phase(film) which separates two other phases from eachother and specifically influences the mass transport between them. A membrane allows passage of molecules or particles depending on their size and chemical nature (polarity, charge, etc)