Process for obtention of highly-lineal, adjustable-isomery monoalkylated aromatic compounds

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,
• a) an alkylation process with a catalyst that produces a linear alkylaromatic compound with a maximum content of 2-phenyl isomers of 20 wt %
• b) an alkylation process with a catalyst that produces a linear alkylaromatic compound with a minimum content of 2-phenyl isomers of 20 wt % comprising a MOR-type zeolite, between 0.01%-0.20 wt % of at least one of the metals selected from the group consisting of:
• Li, Na, K, Mg, and Ca with a maximum of 0.01% Na, and between 0-0.5 wt % of at least one of the metals selected from the group consisting of Ti, Zr, and Hf
• 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.