Patent ID: 6128921
Filing Date: 2000-10-10
Classification: F25J,Y10S

Abstract:
Air distillation plant comprising a plurality of cryogenic distillation units and thermal insulation means for insulating the distillation units; an air feed conduit for supplying air to at least one distillation unit; the thermal insulation means comprising a common thermal insulation wall surrounding at least first and second distillation units; the first and second distillation units comprising low-pressure columns; first and second conduits for removing a product stream from the first and second distillation units respectively; means for forming a single product stream from the streams in the first and second conduits, wherein there are no expansion means producing external work or compressors provided in the first and second conduits; at least one medium-pressure column connected to the air feed conduit and equipped with a head vaporizer/condenser; the low-pressure columns being connected in parallel to the vaporizer/condenser; the common thermal insulation wall also surrounding the medium pressure column and the vaporizer/condenser.