Process for the preparation of aromatic solvent from a dioxane contaminated aromatic stream

US6090993A · kind A · utility

Assignee

• Indian Oil Corporation Limited · IN

Inventors

• Anurag Gupta · Clifton Park, US
• Suresh Kumar Puri · Faridabad, IN
• Arunagiri Samy · Faridabad, IN
• Arvind Pratap Singh · Bachra, IN
• Biswajit Basu · Faridabad, IN
• Som Prakash Srivastava · Faridabad, IN
• Akhilesh Kumar Bhatnagar · Faridabad, IN

Key dates

• Filing date: Oct 26, 1998
• Grant date: Jul 18, 2000
• Expiry date: Oct 26, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C7/13
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

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.