Benzene production by solvent extraction and hydrodealkylation

Mineral oils: processes and products – Chemical conversion of hydrocarbons – Plural serial stages of chemical conversion

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Details

208 96, 260672R, 260674SE, C10G 3518, C07C 358

Patent

active

041152476

ABSTRACT:
A process for converting a naphtha feedstock to a pure benzene including the steps of: reforming the naphtha; removing a major fraction of C.sub.4 - C.sub.5 and heavy reformate components to obtain a reformate containing a major portion of C.sub.6 - C.sub.8 aromatic hydrocarbons and an associated saturated portion; extracting the aromatic hydrocarbons from the reformate countercurrently in a simplified process with a selective hydrophilic solvent, such as sulfolane, having high solubility for aromatic hydrocarbons and low solubility for paraffinic hydrocarbons to obtain an extract stream rich in C.sub.6 - C.sub.8 aromatic hydrocarbons and a raffinate stream rich in paraffinic hydrocarbons; and recovering the selective solvent from the extract stream to obtain an aromatic component comprising a major C.sub.6 - C.sub.8 aromatic hydrocarbons and about 3 to 18 wt. % paraffinic hydrocarbon impurity. The paraffinic impurity is removed and alkyl benzenes are converted by hydrodealkylating the aromatic component to recover substantially pure benzene.
A feature of the simplified extraction process provides for low energy consumption because no stream rich in paraffin is recycled to the solvents extraction unit, thus eliminating the need for stripping the paraffinic impurity from the aromatic component prior to dealkylation.

REFERENCES:
patent: 3371126 (1968-02-01), Carson
patent: 3398083 (1968-08-01), Addison
patent: 3435084 (1969-03-01), Cabbage et al.
patent: 3436434 (1969-04-01), Lester
patent: 3558480 (1971-01-01), Broughton

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