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AssigneeBASF SE
InventorsGerd Kaibel, Carsten Oost, Manfred Stroezel, Gerald Meyer, Peter Trübenbach, Karl-Heinz Sartor, Jürgen Heners
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A process is proposed for the separation of C5+ cuts by distillation into a low-boiler (A), a medium-boiler (B) and a high-boiler fraction (C) in one or more dividing-wall columns (TK), in which a dividing wall (T) is arranged in the longitudinal direction of the column with formation of an upper, common column region (1), a lower, common column region (6), a feed part (2, 4) with rectifying section (2) and stripping section (4), and a withdrawal part (3, 5) with rectifying section (5) and stripping section (3), with feed of the C5+ cut (A, B, C) into the central region of the feed part (2, 4), discharge of the high-boiler fraction (C) from the bottom of the column, discharge of the low-boiler fraction (A) via the top of the column, and discharge of the medium-boiler fraction (B) from the central region of the withdrawal part (3, 5), wherein the dividing ratio of the liquid reflux at the upper end of the dividing wall (T) is set in such a way that the proportion of high-boiling key components in the liquid reflux over the stripping section (3) of the withdrawal part at the upper end of the dividing wall (T) is from 10 to 80%, preferably from 30 to 50%, of the limit value allowed in the medium-boiler fraction (B), and wherein the heating power in the evaporator at the bottom of the dividing-wall column (TK) is set in such a way that the concentration of the low-boiling key components in the liquid at the lower end of the dividing wall (T) is from 10 to 80%, preferably from 30 to 50%, of the limit value allowed in the medium-boiler fraction (B).
A process for the separation of C5+ cuts by distillation into a low-boiler, a medium-boiler and a high-boiler fraction in at least one dividing-wall column, in which a dividing wall is arranged in the longitudinal direction of the column with formation at an upper, common column region, a lower, common column region, a feed part with rectifying section and stripping section, and a withdrawal part with rectifying section and stripping section, with feed of the C5+ cut into the central region of the feed part, discharge of the high-boiler fraction from the bottom of the column, discharge of the low-boiler fraction via the tap of the column, and discharge of the medium-boiler fraction from the central region of the withdrawal part, wherein the dividing ratio of the liquid reflux at the upper end of the dividing wall is set in such a way that the proportion of high-boiling key components in the liquid reflux over the stripping section of the withdrawal part at the upper end of the dividing wall is from 10 to 80% of a limit value allowed in the medium-boiler fraction, and wherein a heating power in an evaporator at the bottom of the at least one dividing-wall column is set in such a way that the concentration of the low-boiling key components in the liquid at the lower end of the dividing wall is from 10 to 80% of the limit value allowed in the medium-boiler fraction.
A process for the separation of C5+ cuts by distillation into a low-boiler, a medium-boiler and a high-boiler fraction in at least one thermally coupled column, where the low-boiler fraction and the high-boiler fraction are withdrawn from different columns, and the operating pressure of the column from which the high-boiler fraction is withdrawn is set from 0.1 to 2 bar lower than the operating pressure of the column from which the low-boiler fraction is withdrawn, with the at least one column arranged to have different regions wherein there is formation of an upper, common column region, a lower, common column region, a feed part with rectifying section and stripping section, and a withdrawal part with rectifying section and stripping section, with feed of the C5+ cut into the central region of the feed part, discharge of the high-boiler fraction from the bottom of the column, discharge of the low-boiler fraction via the top of the column, and discharge of the medium-boiler fraction from the central region of the withdrawal part, wherein the different regions may be in different columns, and wherein the dividing ratio of the liquid reflux at the upper end of the at least one thermally coupled column is set in such a way that the proportion of high-boiling key components in the liquid reflux over the stripping section of the withdrawal part at the upper end of the at least one thermally coupled column is from 10 to 80% of a limit value allowed in the medium boiler fraction, and wherein a heating power in an evaporator at the bottom of the at least one thermally coupled column is set in such a way that the concentration of the low-boiling key components in the liquid at the lower end of the at least one thermally coupled column is from 10 to 80% of the limit value allowed in the medium-boiler fraction.
Dependencies are inferred from the claim text.