Patent ID: 7592499
Filing Date: 2009-09-22
Classification: C07C

Abstract:
1. A process for coproduction of high purity paraxylene and styrene, starting from a feedstock containing xylenes, ethylbenzene and C9-C10 hydrocarbons, the process comprising the following successive steps: a feedstock ( a step of subjecting head stream ( a step of distillation of extract ( a step of distillation of raffinate product ( a step of dehydrogenation of the distilled raffinate product containing metaxylene, orthoxylene and ethylbenzene to obtain an effluent containing styrene, metaxylene, orthoxylene, unconverted ethylbenzene and by-products, performed in at least one dehydrogenation zone ( at least one step of eliminating by-products from said effluent in at least one distillation column, to produce a mixture ( a step of separating mixture ( an isomerization step, in a unit (