| 摘要 |
<p>1280848 Recovering aromatic hydrocarbons UNION CARBIDE CORP 24 Dec 1969 [27 Dec 1968] 62935/69 Heading C5E Sulphur-containing still bottoms formed during the refining of crude styrene obtained from ethyl benzene are treated to recover both sulphur (as S and H 2 S) and aromatic values by: (a) dilution with 0À1-10 times their weight of a diluent selected from benzene, toluene, xylene and mixtures thereof; (b) filtering the mixture of diluent and still bottoms to remove solid sulphur; (c) subjecting the filtrate at 250-600‹ C. and LHSV of 0À1-10 to simultaneous hydrodesulphurization and hydrodealkylation in a hydrotreating zone containing a catalyst comprising both (i) a hydrogenating component selected from oxides of Cr, W and/or V, and (ii) an active acidic component selected from silica-alumina, alumina-boria, magnesia-silica, boron phosphate, metal-exchanged and/or decationized molecular sieves, acid-treated bentonite or kaolinite clays, and mixtures thereof; and (d) separating the effluent to recover desired component, e.g. H 2 S, benzene and ethyl benzene.</p> |
