公开(公告)号：EP1129753A1

公开(公告)日：2001-09-05

申请号：EP01200677.1

申请日：2001-02-22

申请人： FINA TECHNOLOGY, INC.

发明人： Ledoux, Marcus E. ,  Prince, Kelli E. ,  Jacobsen, Adrian M. ,  Braud, Larry P.

IPC分类号： B01D3/32 ,  C07C7/20

CPC分类号： B01D3/322 ,  B01D3/141 ,  C07C7/05 ,  Y10S203/09 ,  C07C15/46

摘要： The present invention is directed to an apparatus and method for the distillation of a readily polymerizable vinyl aromatic compound employing a polymerization inhibitor. The vinyl aromatic compound is subjected to distillation in at least one fractionation column having at least one reboiler for maintaining the bottoms of said column at a proper temperature. The reboiler comprises a heating section and a vapor phase section. The bottoms fraction from the fractionation column is cycled to the reboiler and subjected to heat to vaporize at least a portion of the bottoms fraction to form a vapor phase in the vapor section. A slip stream of the bottoms fraction is introduced to the vapor phase section of the reboiler. The slipstream contains polymerization inhibitor that had been added to the process at the fractionation column. The invention reduces fouling at the reboilers. The slipstream is optionally introduced to the reboiler using one or more spray nozzles. The polymerization inhibitor is added to the fractionation column in sufficient amounts to maintain a concentration of at least 400 parts per million by weight in the bottoms fraction.

摘要翻译： 本发明涉及一种使用聚合抑制剂蒸馏容易聚合的乙烯基芳族化合物的装置和方法。 乙烯基芳族化合物在至少一个具有至少一个再沸器的分馏塔中进行蒸馏，用于将塔的底部保持在适当的温度。 再沸器包括加热段和气相段。 来自分馏塔的塔底馏分循环到再沸器并进行加热以蒸发至少一部分塔底馏分以在蒸汽段中形成气相。 底部馏分的滑流引入再沸器的气相部分。 滑流包含已经在分馏塔中加入到该方法中的阻聚剂。 本发明减少了再沸器的结垢。 滑流可选地使用一个或多个喷嘴引入再沸器。 将聚合抑制剂以足够的量加入到分馏塔中，以保持底部馏分中至少400重量ppm的浓度。