A process for alkylating an aromatic amine comprising: a) loading a fixed bed reactor with an acid treated bentonite clay, b) heating or cooling the reactor to within a selected temperature range, c) passing through the acid treated clay in the fixed bed reactor a mixture comprising one or more olefins selected from propene, butene, pentene, hexene, octene, nonene, a mixture of nonenes, decene, undecene, dodecene, tetradecene, hexadecene, and octadecene; and an aromatic amine of formula: ArNH 2, Ar 2 NH, Ar 3 N or R 2 N-Ar-NR 2, wherein each Ar is independently selected from the group consisting of phenyl, phenyl substituted by C 1-18 alkyl, naphthyl, and naphthyl substituted by C 1-18 alkyl; and each R is independently selected from the group consisting of H, C 1-18 alkyl, phenyl, phenyl substituted by C 1-18 alkyl, naphthyl, and naphthyl substituted by C 1-18 alkyl; to yield a product wherein one or more of the groups Ar are alkylated by one or more alkyl groups derived from the olefin; wherein the reaction pressure is below 250 psi (1.7 MPa). a) loading a fixed bed reactor with an acid treated bentonite clay, b) heating or cooling the reactor to within a selected temperature range, c) passing through the acid treated clay in the fixed bed reactor a mixture comprising one or more olefins selected from propene, butene, pentene, hexene, octene, nonene, a mixture of nonenes, decene, undecene, dodecene, tetradecene, hexadecene, and octadecene; and an aromatic amine of formula: ArNH 2, Ar 2 NH, Ar 3 N or R 2 N-Ar-NR 2, wherein each Ar is independently selected from the group consisting of phenyl, phenyl substituted by C 1-18 alkyl, naphthyl, and naphthyl substituted by C 1-18 alkyl; and each R is independently selected from the group consisting of H, C 1-18 alkyl, phenyl, phenyl substituted by C 1-18 alkyl, naphthyl, and naphthyl substituted by C 1-18 alkyl; to yield a product wherein one or more of the groups Ar are alkylated by one or more alkyl groups derived from the olefin; wherein the reaction pressure is below 250 psi (1.7 MPa). one or more olefins selected from propene, butene, pentene, hexene, octene, nonene, a mixture of nonenes, decene, undecene, dodecene, tetradecene, hexadecene, and octadecene; and an aromatic amine of formula: ArNH 2, Ar 2 NH, Ar 3 N or R 2 N-Ar-NR 2, wherein each Ar is independently selected from the group consisting of phenyl, phenyl substituted by C 1-18 alkyl, naphthyl, and naphthyl substituted by C 1-18 alkyl; and each R is independently selected from the group consisting of H, C 1-18 alkyl, phenyl, phenyl substituted by C 1-18 alkyl, naphthyl, and naphthyl substituted by C 1-18 alkyl; to yield a product wherein one or more of the groups Ar are alkylated by one or more alkyl groups derived from the olefin; wherein the reaction pressure is below 250 psi (1.7 MPa). wherein each Ar is independently selected from the group consisting of phenyl, phenyl substituted by C 1-18 alkyl, naphthyl, and naphthyl substituted by C 1-18 alkyl; and each R is independently selected from the group consisting of H, C 1-18 alkyl, phenyl, phenyl substituted by C 1-18 alkyl, naphthyl, and naphthyl substituted by C 1-18 alkyl; to yield a product wherein one or more of the groups Ar are alkylated by one or more alkyl groups derived from the olefin; wherein the reaction pressure is below 250 psi (1.7 MPa).