Process for separating paraxylene comprising at least two crystallization stages at high temperature
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United States of America Patent
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Nov 14, 2000
Grant Date -
N/A
app pub date -
Jun 30, 1997
filing date -
Dec 29, 1994
priority date (Note) -
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Abstract
A process for producing paraxylene of very high purity from a charge containing a mixture of aromatic hydrocarbons having 7 to 9 carbon atoms in which at least a portion of the charge is made to circulate in a zone suited to enrich a first fraction of paraxylene and at least a portion of said first fraction is purified by at least one high-temperature crystallization in at least one crystallization zone, the process being characterized in that said first paraxylene-enriched fraction is crystallized in a crystallization zone comprising at least two crystallization stages (50,70) at high temperature, and advantageously between +10 and -25 .degree. C. The paraxylene enriching zone can be a crystallization at very low temperature, a selective adsorption or a toluene disproportionation zone.
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