B PERFORMING OPERATIONS; TRANSPORTING
B01 PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
B01D SEPARATION
B01D3/00 Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
B01D3/14 Fractional distillation; or use of a fractionation or rectification column
B01D3/143 by two or more of a fractionation, separation or rectification step