Regenerating a catalyst, useful to produce or reform aromatic hydrocarbon e.g. benzene, toluene, ortho-, meta- or paraxylene, comprises combustion of the catalyst followed by oxychlorination and calcination

摘要

Process for regenerating a catalyst for producing or reforming aromatic hydrocarbon, comprises (a) combustion in a combustion zone A comprising two combustion beds A1 and A2 in series, (b) oxychlorinating in oxychlorinating zone B comprising one oxychlorinating bed, where the oxychlorinating zone B is fed by a chlorinating agent, water or water precursors and gas comprising oxygen, and (c) calcining in a calcining zone C comprising a calcining bed fed by a gas comprising at least an auxiliary dry air. Process for regenerating a catalyst for producing or reforming aromatic hydrocarbon, comprises (a) combustion in a combustion zone A comprising two combustion beds A1 and A2 in series, (b) oxychlorinating in oxychlorinating zone B comprising one oxychlorinating bed, where the oxychlorinating zone B is fed by a chlorinating agent, water or water precursors and gas comprising oxygen, and (c) calcining in a calcining zone C comprising a calcining bed fed by a gas comprising at least an auxiliary dry air, where: the catalyst comprises a support, chlorine and at least a noble metal and is circulated in beds A1 and A2 serially, in the oxychlorinating zone B and in the calcining zone C; effluent gas of bed A1 is sent to bed A2; the gas feeding in the calcining zone C circulates freely towards the oxychlorinating zone B; the auxiliary gas comprising oxygen is produced in an entry of the calcining zone; the effluent gas of the oxychlorinating zone is partly recycled through washing section D towards the entry of the combustion beds A1 and A2; the effluent gas of the oxychlorinating zone is partly recycled by a blower without passing by the section D towards the combustion bed A2; and the effluent gas of the combustion bed A2 is partly recycled through the section D towards the entry of the beds A1 and A2.