Patent ID: 7393986
Filing Date: 2008-07-01
Classification: C07C

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) alkylating the aromatic hydrocarbon by reaction with the C c) feeding the alkylation reaction product coming from the alkylation section to a first separation section; e) discharging from the first separation section: e) feeding the second stream of step (d), consisting essentially of mono-alkylated aromatic hydrocarbon to a dehydrogenation section; f) dehydrogenating the mono-alkylated aromatic hydrocarbon to form a vinyl aromatic monomer; g) feeding a reaction product coming from the dehydrogenation section to a second purification/separation section, comprising at least one distillation column; h) feeding the fourth stream of step (d) consisting essentially of a mixture of polyalkylated aromatic hydrocarbons to said at least one distillation column of step g); i) discharging from a head of said at least one distillation column of step (g), a stream consisting of the vinyl aromatic monomer having a purity higher than 99.7% by weight.