METHOD OF OBTAINING HIGHLY SOLUBLE LINEAR ALKYLBENZOLSULPHONATES

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FIELD : chemistry. SUBSTANCE : invention relates to method of obtaining highly soluble alkyl-aromatic sulphonate with regulated content of 2-phenyl isomer from 18% wt to 70% wt, by means of catalytic alkylation of aromatic compound by purified alkylating agent, which includes the following stages : 1) catalytic dehydration of linear paraffin raw material; 2) selective hydration of diolefins, obtained as by-product at stage (1), to monoolefins; 3) purification of raw material alkylating agent, obtained at stage (2), separation of non-linear products, contained in output flow of stage (2); processing of non-linear products, extracted at stage (3) for formation of hydrotropic precursor; 5) alkylation of aromatic hydrocarbon with monoolefins present in purified alkylating agent, by combination of the following alkylation methods : a) method of alkylation with catalyst, forming raw material liner alkyl aromatic compound with maximal content of 2-phenyl isomer, constituting 20% wt; b) method of alkylation with catalyst, forming raw material linear alkyl aromatic compound with minimal 2-phenyl isomer, constituting 20% wt; 6) separation into fractions of stage (5) output flow in order to separate unreacted aromatic compounds, paraffins and the heaviest by-products of linear alkyl aromatic compounds; 7) purification of fraction of linear alkyl aromatic compounds supplied from stage (6); 8) sulfonation of purified linear alkyl aromatic compounds obtained at stage (7); 9) neutralisation of linear alkyl sulphonic acid, obtained at stage (8), different in that catalyst, which forms maximally 20 % wt of 2-phenyl isomer, includes zeolite of FAU type, from 0.01% wt to 0.15% wt of at least one metal, selected from group, consisting of Li, Na, K, Mg or Ca, and from 0.1% wt, to 8% wt of at least one rare earth metal, selecxted from group, consisting of La, Ce, Pr, Nd, Pm, Sm or Eu; and catalyst, forming minimally 20% wt of 2-phenyl isomer, includes zeolite of MOR type, from 0.01% wt to 0.2% wt of at least one metal, selected from group, consisting of Li, Na, K, Mg or Ca, with maximal content of Na equal 0.01%, and from 0 to 0.5% wt of at least one metal, selected from group, consisting of Ti, Zr, Hf. EFFECT : obtaining alkyl aromatic sulphonate with extremely low coloration after sulfonation with maximised detergent properties. 24 cl, 24 tbl, 4 dwg, 7 ex