Installations for separating solvents, namely, distillation apparatus, distillation installations and thermal separation installations for the separation, build-up concentration and treatment of waste water, distillation installations and thermal separation installations for the build-up concentration of ethanol, ethanol distillation apparatus, distillation installations and thermal separation installations for separating volatile acids in the nature of hydrochloric acid, nitric acid or hydrofluoric acid from old corrosive agents, distillation installations and thermal separation installations for stripping ammonia from alkaline solutions and mobile models of all aforesaid installations and apparatus; and structural parts of all aforesaid goods