A process for obtaining a highly soluble alkyl aromatic sulfonate and with an adjustable 2-phenyl isomer content between 18% - 70% by weight, by means of 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 hydrogenating the diolefins produced as a by-product in step i) to mono-olefins. iii) purifying the raw alkylating agent obtained in step ii), separating the non-linear products contained in the effluent of step ii). iv) treating the non-linear products extracted in step iii) to form the hydrotropic precursor. v) alkylating the aromatic hydrocarbon with the mono-olefins present in the purified alkylating agent, by means of the combination of the following alkylation processes. a) an alkylation process with a catalyst producing a raw linear alkyl aromatic compound with a maximum 2-phenyl isomer content of 20% by weight b) an alkylation process with a catalyst producing a raw linear alkyl aromatic compound with a minimum 2-phenyl isomer content of 20% by weight vi) fractioning the effluent of step v) for the purpose of separating the aromatic compounds which have not reacted, the paraffins and the heaviest by-products of the linear alkyl aromatic compounds vii) purifying the fraction of linear alkyl aromatics coming from step vi). viii) sulfonating the purified linear alkyl aromatics obtained in step vii) ix) neutralizing the linear alkyl sulfonic acid produced in step viii) characterized in that the catalyst producing a maximum of 20% by weight of 2-phenyl isomer comprises: a) a zeolite with a FAU type isotopic structure, wherein the zeolite is zeolite Y, b) 0.08% by weight of Na and c) between 3-4% by weight of La, between 0.5-1.5% by weight of Ce, between 0.1-1% by weight of Pr and between 1-2% by weight of Nd. and in that the catalyst producing a minimum of 20% by weight of 2-phenyl isomer comprises a MOR type zeolite, between 0.01%-0.2% by weight of at least one of the metals selected from the group consisting of: Li, Na, K, Mg or Ca, with a maximum of 0.01% of Na, and between 0-0.5% by weight of at least one of the metals selected from the group consisting of Ti, Zr, Hf. i) catalytically dehydrogenating a linear paraffin feed. ii) selectively hydrogenating the diolefins produced as a by-product in step i) to mono-olefins. iii) purifying the raw alkylating agent obtained in step ii), separating the non-linear products contained in the effluent of step ii). iv) treating the non-linear products extracted in step iii) to form the hydrotropic precursor. v) alkylating the aromatic hydrocarbon with the mono-olefins present in the purified alkylating agent, by means of the combination of the following alkylation processes. a) an alkylation process with a catalyst producing a raw linear alkyl aromatic compound with a maximum 2-phenyl isomer content of 20% by weight b) an alkylation process with a catalyst producing a raw linear alkyl aromatic compound with a minimum 2-phenyl isomer content of 20% by weight a) an alkylation process with a catalyst producing a raw linear alkyl aromatic compound with a maximum 2-phenyl isomer content of 20% by weight b) an alkylation process with a catalyst producing a raw linear alkyl aromatic compound with a minimum 2-phenyl isomer content of 20% by weight vi) fractioning the effluent of step v) for the purpose of separating the aromatic compounds which have not reacted, the paraffins and the heaviest by-products of the linear alkyl aromatic compounds vii) purifying the fraction of linear alkyl aromatics coming from step vi). viii) sulfonating the purified linear alkyl aromatics obtained in step vii) ix) neutralizing the linear alkyl sulfonic acid produced in step viii) a) a zeolite with a FAU type isotopic structure, wherein the zeolite is zeolite Y, b) 0.08% by weight of Na and c) between 3-4% by weight of La, between 0.5-1.5% by weight of Ce, between 0.1-1% by weight of Pr and between 1-2% by weight of Nd.