Problem Cause Comments Recommendations
Still Corrosion Excessive heat and moisture If high temperatures or pressures are used during reclamation, or if the process is prolonged to recover the last traces of solvent from the residue, undesirable corrosive and odorous contaminants may enter the reclaimed solvent. These impurities may adversely affect the metal surfaces of inner walls and condensing coils. Operate still as recommended by manufacturer. Check for pinhole leaks in steam coils. Follow these recommendations:
  1. Do not exceed recommended steam pressure for still (<60 psi).
  2. Working steam trap should be hot. If cold, inspect and resolve source of difficulty.
  3. Steam sweeping should only be practiced during boildown.
  4. Outlet temperature from refrigerated condenser should be <45°F.
  5. Still requires cleaning when rate slows down or stops. This is indicated by a rise in steam pressure.
  6. Drain still residues while hot. This can prevent caking.
Still Foaming Excess moisture in system due to pinhole leaks in condenser and/or steam coils. Overheating the still or improper and extensive use of live steam will cause foaming. Certain finishing agents will also promote foaming. Excessive foaming can overflow and enter the reclaimed solvent, causing contamination of the cleaning solvent

Check equipment for water leaks. Operate the unit as recommended by the manufacturer. Antifoam agents can be purchased from detergent suppliers.

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