PARAXYLENE SEPARATION PROCESS COMPRISING AT LEAST TWO HIGH TEMPERATURE CRYSTALLIZATION STAGES

摘要

process for the production of very high purity paraxylene from a loadcontaining a mixture of aromatic hydrocarbonsfrom 7 to 9 carbon atoms to move at least a part ofthe load in a first zone adapted to enrichparaxylene is purified fraction and at least a portion of the firstat least a portion of the high temperature of crystallizationat least one zone of crystallization, the process being characterized in thatwe set the first fraction enriched in paraxylenein a crystallization zone comprising at least two layers (50, 70)crystallization at high temperature, and used in10 and 25 degrees. the zone of enrichment may be a paraxyleneat very low temperatures, crystallization, adsorption selectivityan area of disproportionation of toluene.