Patent ID: 8888964
Filing Date: 2014-11-18
Classification: B01D,C07C

Abstract:
1. A method for producing n-butanol from crude n-butanol as a feed F by fractional distillation in a dividing wall distillation column, wherein the dividing wall distillation column comprises a condenser; a reboiler; and a main column including a dividing wall installed therein, the main column being divided into a top zone, an upper feed zone, an upper outflow zone, a lower feed zone, a lower outflow zone and a bottom zone, a feed F containing at least 90% by weight of n-butanol flows into an intermediate feed plate NR wherein a low boiling component D flows out of the top zone, a high boiling component B flows out of the bottom zone and an intermediate boiling component S flows out of an intermediate outflow plate NR wherein the intermediate boiling component S is substantially n-butanol, wherein the number of plates in each of the top zone, the upper feed zone, the upper outflow zone, the lower feed zone, the lower outflow zone and the bottom zone of the main column is in the range of 80 to 145% of the number of theoretical plates in the corresponding zone, as calculated by distillation curves, wherein the dividing wall has a length in the range of 30 to 85% of the total number of theoretical plates in the top zone, the upper feed zone, the lower outflow zone and the bottom zone, wherein a temperature of the top zone is in the range of 90 to 100° C. at ambient pressure, a temperature of the bottom zone is in the range of 140 to 160° C. at ambient pressure and a temperature of the intermediate outflow plate NR wherein the temperature of the top zone is in the range of a lower limit temperature T (wherein T (wherein T (wherein T