Patent ID: 6281399
Filing Date: 2001-08-28
Classification: B01J,C07C,C10G,Y02P

Abstract:
A process for producing isopropyl aromatic hydrocarbons, said process comprising:a) passing a first transalkylation feed stream comprising an aromatic substrate hydrocarbon to a transalkylation reaction zone, passing a second transalkylation feed stream comprising a first isopropyl aromatic hydrocarbon having more than one isopropyl group to said transalkylation reaction zone, transalkylating said aromatic substrate hydrocarbon with said first isopropyl aromatic hydrocarbon in the presence of a first solid catalyst in said transalkylation reaction zone to produce a second isopropyl aromatic hydrocarbon having at least one more isopropyl group than said aromatic substrate hydrocarbon, and recovering from said transalkylation reaction zone a transalkylation effluent stream comprising said aromatic substrate hydrocarbon and said second isopropyl aromatic hydrocarbon;b) passing a first alkylation feed stream comprising propylene to a first bed of an alkylation reaction zone, passing a first aliquot portion of said transalkylation effluent stream to said first bed, and alkylating said aromatic substrate hydrocarbon with propylene in the presence of a second solid catalyst in said first bed to produce a first bed effluent stream comprising said second isopropyl aromatic hydrocarbon;c) passing at least a portion of said first bed effluent stream and a second aliquot portion of said transalkylation effluent stream to a second bed of said alkylation reaction zone, alkylating said aromatic substrate hydrocarbon with propylene in the presence of a third solid catalyst in said second bed to produce said second isopropyl aromatic hydrocarbon; andd) recovering said second isopropyl aromatic hydrocarbon from said process.