Manufacture of high purity benzene and para-rich xylenes by combining aromatization and selective disproportionation of impure toluene
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United States of America Patent
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Nov 27, 2001
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N/A
app pub date -
Jul 12, 1994
filing date -
Jun 18, 1992
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Abstract
A process is set forth for reacting impure toluene to obtain benzene, toluene and a para-rich xylene stream, which are substantially free of close-boiling non-aromatics. The impure toluene comprises at least 70 wt % toluene and between about 0.2 wt % and about 5 wt % close-boiling non-aromatics. The process may also comprise aromatizing a naphtha over a non-acidic catalyst. The impure toluene from the aromatization step is passed over an acidic intermediate pore zeolite to produce a para-rich xylene stream and chemically pure benzene.
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