Thermal reforming of naphthenic and hydrodealkylation of aromati

Details Thermal reforming of naphthenic and hydrodealkylation of aromati Thermal reforming of naphthenic and hydrodealkylation of aromati

1993-07-16

1995-01-17

McFarlane, Anthony

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

From alicyclic

585488, 208133, C07C 532, C07C 412, C10G 3500

Patent

active

053827341

ABSTRACT:
Hydrocarbon feedstocks containing tetra-hydro-dicyclo-penta-diene (THDCPD) dissolved in a suitable solvent is substantially totally reformed and hydroconverted in a non-catalytic reactor having length/internal diameter ratio between 10/1 and 30/1 at critical controlled reaction conditions, including molar ratio of hydrogen-to-THDCPD of 5.0:1-12.0:1, reaction temperature of 1100.degree.-1350.degree. F., reactor pressure of 550-650 psig, and feedstream reactor residence time of 10-50 seconds so as to yield primarily benzene product together with minor aromatic materials. Suitable solvent materials can be an aromatic solvent, a non-aromatic solvent containing naphthenic and paraffinic compounds, or a combination of each. When the solvent is predominantly an alkyl aromatics mixture, these components are hydrodealkylated while the THDCPD material undergoes simultaneous reformation in the reactor. Heavy mono-aromatic materials contained in the reactor effluent may be recycled back to the reactor to ultimately yield additional benzene, with minimal aromatics loss. Heavy fractions of biphenyl and alkyl-biphenyls may also be recycled to the reactor to minimize formation of new biphenyl molecules.

REFERENCES:
patent: 2780661 (1957-02-01), Hemminger et al.
patent: 3371126 (1968-02-01), Carson
patent: 3404191 (1968-10-01), Soderquist et al.
patent: 3517076 (1970-06-01), Juhl et al.

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