Patent ID: 7728184
Filing Date: 2010-06-01
Classification: C07C,Y10S

Abstract:
1. An improved process for the production and purification of vinyl-aromatic monomers which comprises: a) feeding a stream consisting of an aromatic hydrocarbon together with a stream essentially consisting of a C b) feeding the reaction product coming from the alkylation section to a first separation section; c) discharging from the first separation section a first stream consisting of non-reacted aromatic hydrocarbon, which is recycled to the alkylation section, a second stream essentially consisting of a mono-alkylated aromatic hydrocarbon, a third stream essentially consisting of dialkylated aromatic hydrocarbons, sent to a transalkylation section, and a fourth stream essentially consisting of a mixture of polyalkylated aromatic hydrocarbons; d) feeding the second stream of step (c) to a dehydrogenation section; e) feeding the reaction product coming from the dehydrogenation section to a second separation/purification section, comprising at least one distillation column; and f) discharging a stream consisting of the vinyl-aromatic monomer with a purity of over 99.7% by weight, from the head of said at least one distillation column, wherein: