Patent ID: 8237001
Filing Date: 2012-08-07
Classification: B01J,C07C,C11D,Y02P

Abstract:
1. Procedure for obtaining a linear monoalkylaromatic compound with a 2-phenyl isomer content able to be adjusted between 18% and 70 wt %, through the catalytic alkylation of an aromatic compound with a purified alkylating agent, comprising the following steps: i) catalytically dehydrogenating a linear paraffin feed, ii) selectively dehydrogenating the diolefins produced as a by-product of step i) to mono-olefins, to obtain the raw alkylating agent, iii) purifying the raw alkylating agent obtained in step ii), separating the non-linear products contained in the effluent of step ii), to obtain the purified alkylating agent, iv) treating the non-linear products extracted in step iii) to generate the hydrotropic precursor, v) alkylating the aromatic hydrocarbon with the mono-olefins present in the purified alkylating agent, through the combination of the following processes, vi) fractionating the effluent of step v) to separate the aromatic compounds which have not reacted, the paraffins and the lightest and heaviest by-products, from the linear mono-alkylaromatic compounds of interest vii) purifying the fraction of linear mono-alkylaromatic compounds coming from step vi), wherein the catalyst producing a maximum of 20 wt % of 2-phenyl isomers comprises a FAU-type zeolite, between 0.5-2.0 wt % of at least one of the metals selected from the group consisting of: Li, Na, K, Mg, and Ca, and rare earth metals in between 4.5-10 wt % of La, between 1.2-4 wt % of Ce, between 0.5-1.5 wt % of Pr, and between 2-3 wt % of Nd.