公开(公告)号：US6090993A

公开(公告)日：2000-07-18

申请号：US178581

申请日：1998-10-26

申请人： Anurag Ateet Gupta ,  Suresh Kumar Puri ,  Arunagiri Samy ,  Arvind Pratap Singh ,  Biswajit Basu ,  Som Prakash Srivastava ,  Akhilesh Kumar Bhatnagar

发明人： Anurag Ateet Gupta ,  Suresh Kumar Puri ,  Arunagiri Samy ,  Arvind Pratap Singh ,  Biswajit Basu ,  Som Prakash Srivastava ,  Akhilesh Kumar Bhatnagar

IPC分类号： C07C7/12 ,  C07C7/13

CPC分类号： C07C7/12 ,  C07C7/13

摘要： A process for preparing benzene containing less than 1 ppm (wt) dioxane from an aromatic stream containing benzene which is contaminated with dioxane, the process including providing an aromatic stream containing benzene which is contaminated with dioxane; subjecting the aromatic stream to liquid phase adsorption by contacting an adsorbent contained in at least one column, which adsorbent comprises at least one substance selected from the group consisting of molecular sieves and clay; and recovering benzene containing less than 1 ppm (wt) dioxane. Preferably, the liquid phase adsorption is carried out at a pressure ranging from atmospheric pressure to 20 kg/cm.sup.2 and at a temperature ranging from ambient temperature to 50.degree. C. Preferably, the molecular sieves have a pore size of 10 .ANG.. The process may further include regenerating the adsorbent by passing a flow of nitrogen gas through the adsorbent at a temperature ranging from 200 to 300.degree. C. Alternatively, the process may further include regenerating the adsorbent by heating the adsorbent at a temperature ranging from 200 to 300.degree. C. for a period of time which is effective to regenerate the adsorbent.

摘要翻译： 由含有被二恶烷污染的苯的芳族物流制备含有少于1ppm（重量）二恶烷的苯的方法，该方法包括提供含有被二恶烷污染的苯的芳族物流; 通过使包含在至少一个塔中的吸附剂接触而使芳族物流进行液相吸附，该吸附剂包含选自分子筛和粘土的至少一种物质; 并回收含有少于1ppm（重量）二恶烷的苯。 优选地，液相吸附在大气压至20kg / cm 2的压力和在环境温度至50℃的温度下进行。优选地，分子筛的孔径为10安。 该方法还可以包括通过在200-300℃的温度范围内使氮气流通过吸附剂来再生吸附剂。或者，该方法还可以包括通过在200至200℃的温度范围内加热吸附剂来再生吸附剂 在300℃下持续一段有效再生吸附剂的时间。