Falling Film Evaporator

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The Falling Film Evaporator (FFE) are vertical shell and tube heat exchangers designed with a vapor-liquid separator to efficiently separate the vapor from the remaining liquid. In an FFE, the feed liquid is introduced at the top, descending along the inner surface of the heated tubes as a thin film, while the co-current flow of generated vapors increases turbulence, thereby optimizing heat transfer. In an RFE, the liquid is fed from the bottom of the tubes; as it is heated, the resulting vapors lift the liquid upward, generating high velocities that enhance thermal efficiency. Both configurations utilize the vapor-liquid separator to effectively separate the vapor from the residual liquid.

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Features

  • The thermosiphon effect eliminates the requirement for a circulation pump
  • Capable of handling small amounts of suspended particles in the feed
  • Functions efficiently under moderate vacuum conditions
  • Multiple-effect design improves steam efficiency
  • Suitable for processing heat-sensitive materials
  • Ensures gentle evaporation with minimal retention time in the evaporator

Applications

  • Concentration of dilute solutions containing heat-sensitive materials, such as plant extracts
  • Used as a reboiler for distillation columns
  • Solvent recovery from contaminated mixtures
  • Pre-concentration step before using ATFE or ATFD
  • Efficient recovery of solvents after extraction