| CPC B01D 3/141 (2013.01) [B01D 3/146 (2013.01); B01D 3/326 (2013.01); B01D 3/328 (2013.01)] | 10 Claims |
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1. An apparatus located in a dividing wall column for an isomerization unit, wherein the apparatus comprises:
at least one primary vertical wall located at a first set of predetermined plurality of trays in the dividing wall column and configured to separate a feed from a first side cut, wherein a primary top section of the at least one vertical wall is open and configured for mass transfer between vapor and liquid between a column section above the at least one vertical wall, wherein a primary bottom section of the at least one vertical wall is open and configured for mass transfer between vapor and liquid with a column section below the at least one vertical wall;
one or more secondary vertical walls placed at a second set of predetermined plurality of trays in the dividing wall column and configured to enable a second side cut wherein each of the one or more secondary vertical walls consists at least one predetermined shape, wherein the dividing wall column produces four cuts wherein one is a hexane cut, wherein a secondary top section of the one or more secondary vertical walls is closed and there is no mass transfer between vapor and liquid with a column section above the one or more secondary vertical walls, wherein a secondary bottom section of the wall is open and there is mass transfer between vapor and liquid with a column section below the one or more secondary vertical walls, wherein there are two walls in different sections of the column,
characterized in that,
wherein the at least one primary vertical wall consists of one of a straight wall, an ‘L’ shaped wall, an ‘Γ’ shaped wall, and a zig-zag wall, wherein the zig-zag wall is configured to provide more active area on a feed side,
wherein the one or more secondary vertical walls are mechanically coupled to form a second vertical wall;
a pump is located around the one or more secondary vertical walls, and configured to reduce a reboiler duty; and
a benzene saturation unit configured to produce Polymer Grade Hexane (PGH) upon reducing the concentration of benzene in the produced Food Grade Hexane FGH), wherein the benzene saturation unit is operatively coupled with the dividing wall column so that the hexane produced by the dividing wall column is sent to the benzene saturation unit which consists of a reactor to minimize the benzene by hydrogenating part of benzene present in FGH to produce PGH, and wherein the benzene saturation consists of:
an upstream mixer unit configured to mix the hexane product with hydrogen; and
a stripper column configured to separate the hexane of a pre-defined grade from lighter hexane.
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