Patent ID: 6348136
Filing Date: 2002-02-19
Classification: B01D,C07C,Y10S

Abstract:
Apparatus for the distillation of a readily polymerizable vinyl aromatic compound employing a polymerization inhibitor comprising:at least one fractionation column having reboiler means connected thereto for maintaining the bottoms of said column at a proper temperature, feed lines for introducing a vinyl aromatic compound into said column, and product lines for recovering an overhead product and a bottoms fraction therefrom; the reboiler means comprising a heating section and a vapor phase section; means for cycling the bottoms fraction to the reboiler means and subjecting the bottoms fraction to heat to vaporize at least a portion of said bottoms fraction to form a vapor phase in the vapor phase section; and means for introducing a slipstream of the bottoms fraction to the vapor phase section of the reboiler means.