Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By contact with solid sorbent
Patent
1998-10-26
2000-07-18
Griffin, Walter D.
Chemistry of hydrocarbon compounds
Purification, separation, or recovery
By contact with solid sorbent
585820, 585824, 585826, C07C 712, C07C 713
Patent
active
060909935
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.
REFERENCES:
patent: 3007980 (1961-11-01), Barton et al.
patent: 3121756 (1964-02-01), Barrer
patent: 3398208 (1968-08-01), Ward
Basu Biswajit
Bhatnagar Akhilesh Kumar
Gupta Anurag Ateet
Puri Suresh Kumar
Samy Arunagiri
Griffin Walter D.
Indian Oil Corporation Ltd.
Spencer George H.
Wells Ashley J.
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