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une fraction du condensat est renvoyée sous un débit de 3,69 kg/heure en tête de seconde colonne, à titre de reflux.
a fraction of the condensate is passed under a flow rate of 3.69 kg/hour to the head of the second column as reflux.
procédé selon la revendication 19, caractérisé en ce que le courant de traînée est retiré avec un débit de 0,03 à 0,05 du débit de reflux.
process according to claim 19, characterized in that the drag stream is removed with a flow rate of 0.03-0.05 of reflux flow rate.
le débit de reflux interne est de 1,1 cm 3 /min et sa composition est toluène 0,005 %, ethylbenzène 0,035 %, paraxylène 99,80 %, metaxylène 0,13 %, orthoxylène 0,03 %.
the internal reflux flow rate was 1.1 cm.sup.3 /min and its composition was as follows: toluene 0.005%, ethylbenzene 0.035%, para-xylene 99.80%, meta-xylene 0.13%, orthoxylene 0.03%. the feed flow rate was 4.4 cm.sup.3 /min and its composition was as follows: toluene 2.29%, ethylbenzene 10.11%, para-xylene 23.55%, meta-xylene 49.88%, orthoxylene 14.16%.