Extractive distilling with reworking of residue

Details Extractive distilling with reworking of residue Extractive distilling with reworking of residue

B - Operations, Transporting

01

D

202/83

B01D 3/40 (2006.01) B01D 3/42 (2006.01) C07C 7/08 (2006.01) C10G 7/08 (2006.01) C10G 7/12 (2006.01)

Patent

CA 1174634

ABSTRACT OF THE DISCLOSURE A method for working up residues of an extractive distilling process for obtaining pure hydrocarbons. The residue from an extractive distilling column is fed to the about middle part of a distilling column. The hydrocarbons are distilled and removed at the head of the distilling column and the solvent is removed at the bottom of the distilling column. A sidestream is removed from the distilling column at a position above the feed plate for the residue from the extractive distilling column via a so-called reflux evaporator plate having an elevated level of liquid. The sidestream is heated by indirect heat exchange with the solvent flowing from the distilling column. The heated-up sidestream is fed back into the distilling column at a level at or above the reflux evaporator plate. The concentration of the solvent at the reflux evaporator plate is controlled by the amount of reflux at the head of the distilling column. The heating of the side stream reduces the heat requirement of the bottom boiler of the distilling column by about 35 percent. -1-

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