To improve an energy-saving effect while an external reflux is made unnecessary.
Inside a distillation column body barrel 1, an inside 4 and an outside 5 of a single or a plurality of pipes 25 are separated from each other by connecting the pipe 25 to the body barrel 1 by both end pipe plates 3a, 3b. By providing a difference in operation pressure between a pipe interior (4 side) and a pipe exterior (5 side), operating temperatures are made different. By transmitting hea from a high pressure side to a low pressure side by using the pipe wall(s) of the single pipe or the plurality of the pipes as a heat transfer face, the high pressure side functions as a concentration part 4, and the low pressure side function as a recovery part 5. In an upper part of the concentration part 4 of such a constituted internal heat exchanging type distillation column, an area (a reflux liquid generating area) 20 for generating the reflux liquid by condensing a rising vapor is provided, and a wire net-regular filler (a mesh material-made regular filler) 21 is filled in the reflux liquid generating area 20.
ASO KAZUMASA
NAKANISHI TOSHINARI
NODA HIDEO
YOSHIDA KAZUFUMI
KIMURA KAKOKI CO LTD
KANSAI KAGAKU KIKAI SEISAKU KK
MARUZEN PETROCHEM CO LTD
Nishizawa Hitoshi