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A liquid containing a contaminant such as water or polymeric solids is purified. Purification of a liquid containing a contaminant is enhanced by the use of second fractionating column in conjunction with a first fractionating column to recover a portion of the liquid to be purified from the kettle

A liquid containing a contaminant such as water or polymeric solids is purified. Purification of a liquid containing a contaminant is enhanced by the use of second fractionating column in conjunction with a first fractionating column to recover a portion of the liquid to be purified from the kettle product of the first column. Vapor from a second fractionating column is used to control the total energy input to a first fractionating column.

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A process for purifying a liquid to be purified which contains contaminants, comprising: (a) passing a feedstream comprising the liquid to be purified and a contaminant to a first fractionating column, (b) separating in said first fractionating column said feedstream into a first overhead fraction,

A process for purifying a liquid to be purified which contains contaminants, comprising: (a) passing a feedstream comprising the liquid to be purified and a contaminant to a first fractionating column, (b) separating in said first fractionating column said feedstream into a first overhead fraction, a side draw fraction, and a first bottom fraction, (c) removing from said first fractionating column, said first overhead fraction comprising a contaminant having a volatility greater than that of the liquid to be purified, (d) feeding to a second fractionating column, said first bottom fraction of the first fractionating column, said first bottom fraction comprising a contaminant having a volatility less than or equal to the volatility of the liquid to be purified and comprising a portion of the liquid to be purified, (e) separating in said second fractionating column said first bottom fraction of the first fractionating column into a second overhead fraction and a second bottom fraction (f) removing from the process, said second bottom fraction of the second fractionating column comprising substantially a contaminant, (g) removing from said second fractionating column, said second overhead fraction comprising the liquid to be purified in a vapor phase, (h) feeding said second overhead stream into the first fractionating column to provide a portion of the heat required in said first fractionating column, (i) removing from the first fractionating column, at a point above where said second overhead stream is fed into the first fractionating column, said side stream fraction of the first fractionating column comprising the liquid purified of contaminant, (j) cooling said side draw fraction which has been removed from the first fractionating column, (k) passing a portion of the cooled side draw fraction to the second fractionating column as a reflux-type stream, (l) recovering a portion of the cooled side draw fraction as purified liquid product.