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AssigneeThe Dow Chemical Company
InventorsMohammed S. U. Samson, Matheus J. M. Van der Aalst, Garmt R. Meima, Guo-shuh John Lee, Juan M. Graces
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A process of preparing an alkylated benzene or mixture of alkylated benzenes involving contacting a benzene feedstock with a solid acid, such as an acidic clay or acid zeolite, in a pretreatment zone at a temperature greater than about 130° C. but less than about 300° C. to form a pretreated benzene feedstock, and thereafter contacting the pretreated benzene feedstock with (a) an alkylating agent in an alkylation zone or (b) a transalkylating agent in a transalkylation zone, in the presence of an alkylation/transalkylation catalyst so as to prepare the alkylated benzene or mixture of alkylated benzenes. The pretreatment step improves the lifetime of the alkylation/transalkylation catalyst. Preferred products are ethylbenzene and cumene.
A process of preparing an alkylated benzene or mixture of alkylated benzenes comprising (1) contacting a benzene feedstock having a water concentration of less than 200 ppm by weight with a solid acid in a pretreatment zone at a temperature greater than 130° C. but less than 300° C. to form a pretreated benzene feedstock, and thereafter (2) contacting the pretreated benzene feedstock with (a) an alkylating agent in an alkylation zone or (b) a transalkylating agent in a transalkylation zone, the contacting occurring in the presence of an alkylation/transalkylation catalyst selected from the group consisting of acidic mordenite, acidic beta zeolite, acidic Y zeolite, acidic omega zeolite, acidic L zeolite, and crystalline magnesium silicates, under liquid phase reaction conditions sufficient to produce the alkylated benzene or mixture of alkylated benzenes.
A process of preparing ethylbenzene or cumene comprising (1) drying a wet benzene feedstock under conditions such that water in the feedstock is reduced to a concentration of less than 200 ppm by weight, the drying being effected by:
A process of increasing the lifetime of an alkylation/transalkylation catalyst employed in the alkylation of a benzene feedstock with an alkylating agent, or employed in the transalkylation of a benzene feedstock with a polyalkylated benzene, the process comprising contacting a benzene feedstock having a water concentration of less than 200 ppm by weight with a solid acid selected from the group consisting of acidic aluminas, silicas, silica-aluminas, clays, zeolites and mesoporous aluminosilicates at a temperature greater than 130° C. but less than 300° C. prior to the benzene feedstock participating in liquid phase alkylation or transalkylation using an alkylation/transalkylation catalyst selected from the group consisting of acidic mordenite, acidic beta zeolite, acidic Y zeolite, acidic omega zeolite, acidic L zeolite, and crystalline magnesium silicates.
Dependencies are inferred from the claim text.