Detergent grade olefins, alkylbenzenes and alkylbenzene sulfonates and processes for preparing

A process for preparing C.sub.12 semi-linear olefins which comprises the steps of:

• (a) contacting a propylene feed containing at least about 90% by weight propylene with a selective dimerization catalyst selected from the group of hexafluoroacetoacetyl nickel cyclooctyldiene or bis[pentafluorophenylthio]nickel with triethyl aluminum sesquichloride under dimerization conditions at temperatures in the range of about from 50.degree. to 80.degree. C. and pressures in the range of about 10 to 40 atmospheres using a catalyst ratio in the range of about from 1,000 to 50,000 mole of propylene per mole of catalyst to yield dimer product containing at least about 60% by weight of linear hexenes and the remainder higher olefins, branched C.sub.6 olefins and unreacted propylene;
• (b) fractionally distilling the reaction product of step (a) to recover a C.sub.6 olefin fraction containing about from 70 to 82% by weight linear hexenes;
• (c) contacting the C.sub.6 olefin fraction product of step (b) with a dimerization catalyst selected from the group of hexafluoroacetoacetyl nickel cyclooctadiene;
• bis[pentafluorophenylthio]nickel with triethyl aluminum sesquichloride;
• bis[triphenylphosphino]nickel dicarbonyl with aluminum chloride;
• nickel 2-ethylhexanoate trifluoroacetate with diethyl bis-aluminum tetrachloride;
• and nickel 2-ethylhexanoate trifluoroacetate with ethyl aluminum at temperatures in the range of about from 10.degree. to 80.degree. C. and pressures in the range of about from 1 to 5 atmospheres and a catalyst ratio in the range of about from 500 to 5,000 moles of C.sub.6 olefin fraction per mole of catalyst to produce a semi-linear C.sub.12 olefin product containing at least 60% by weight of linear dodecenes and mono-branched C.sub.12 olefins.

A process for preparing C.sub.12 semi-linear olefins comprising the steps of:

• (a) contacting a propylene feed with a selective dimerization catalyst, selective to the production of higher olefins, under dimerization conditions to produce a higher olefin product containing at least 60% by weight linear hexenes, under dimerization conditions and wherein said selective dimerization catalyst is selected from the group of:
• (1) a complex of a nickel chelate having the formula ##STR4## wherein R and R' independently are hydrogen, alkyl or aryl of up to 10 carbon atoms, or haloalkyl or haloaryl of up to 10 carbon atoms, with the proviso that the two R' groups of each chelating ligand together with the adjacent carbon atoms to which they are attached, can form a six-membered carbocyclic aromatic ring or a halogen substituted six-membered carbocyclic aromatic ring have 1 to 4 halogen substituents selected from the group of fluoro, chloro, bromo or iodo;
• with an alkyl aluminum alkoxide having the formula
• (R").sub.m Al(OR").sub.n
• wherein each R" independently is alkyl of up to 10 carbon atoms, preferably of up to 4 carbon atoms, m is a whole number from 1 to 2 inclusive and n is a whole number from 1 to 2 inclusive selected so that the sum of m and n equals 3;
• (2) a complex of bis(1,5-cyclooctadiene)nickel(O) with hexafluoro-2,4-pentanedione;
• and
• (3) a complex comprising transition metal complex selected from complexes of nickel and palladium with a fluoro-organic thiol or sulfide ligand, having a single sulfur atom in a ligating position and wherein the carbon atom adjacent the carbon atom to which the sulfur atom is attached has at least one fluoro substituent and with the proviso that said fluoro-organic thiol or sulfide does not contain any other ligating group or atom in a ligating position which will displace fluoro as a ligand, and an organometallic-reducing agent selected from the group of borohydride and organoaluminum halides and alkoxides having the formula R*.sub.m AlX.sub.n wherein R* is alkyl, aryl or arylalkyl;
• X is fluoro chloride, bromide, iodide or alkoxide and m is 1 or 2 and n is 3-m;
• (b) fractionally distilling the reaction product of step (a) to recover a C.sub.6 olefin fraction containing linear hexenes and branched C.sub.6 olefins and wherein said fraction contains 70 to 82% by weight of linear hexenes;
• (c) treating the C.sub.6 olefin fraction recovered from step (b) with aqueous sulfuric acid at under reactive conditions at temperatures below about 30.degree. C. thereby yielding a two liquid phase mixture comprising a C.sub.6 olefin phase having a linear olefin content of at least about 80% by weight and an aqueous phase containing soluble nonlinear olefin sulfonates and recovering said C.sub.6 olefin phase from said aqueous phase;
• and
• (d) contacting the C.sub.6 olefin phase recovered in step (c) with a dimerization catalyst under dimerization conditions thereby producing a semi-linear C.sub.12 olefin product containing at least 75% by weight linear dodecenes and mono-branched C.sub.12 olefins.

A process for preparing C.sub.12 semi-linear olefins which comprises the steps of:

• (a) contacting a propylene feed containing at least about 90% by weight propylene with a selective dimerization catalyst selected from the group of hexafluoroacetoacetyl nickel cyclooctyldiene or bis[pentafluorophenylthio]nickel with triethyl aluminum sesquichloride under dimerization conditions at temperatures in the range of about from 50.degree. to 80.degree. C. and pressures in the range of about 10 to 40 atmospheres using a catalyst ratio in the range of about from 1,000 to 50,000 mole of propylene per mole of catalyst to yield dimer product containing at least about 60% by weight of linear hexenes and the remainder higher olefins, branched C.sub.6 olefins and unreacted propylene;
• (b) fractionally distilling the reaction product of step (a) to recover a C.sub.6 olefin fraction containing about from 70 to 82% by weight linear hexenes;
• (c) treating the C.sub.6 olefin fraction recovered from step (b) with aqueous sulfuric acid under reactive conditions at temperature below about 30.degree. C. to yield a two liquid phase mixture comprising a C.sub.6 olefin phase having a linear olefin content of at least about 80% by weight and an aqueous phase containing soluble non-linear olefin sulfonates and recovering said C.sub.6 olefin phase from said aqueous phase;
• and
• (d) contacting the C.sub.6 olefin phase recovered in step (c) with a dimerization catalyst selected from the group of hexafluoroacetoacetyl nickel cyclooctadiene;
• bis[pentafluorophenylthio]nickel with triethyl aluminum sesquichloride;
• bis[triphenylphosphino]nickel dicarbonyl with aluminum chloride;
• nickel 2-ethylhexanoate trifluoroacetate with diethyl bis-aluminum tetrachloride;
• and nickel 2-ethylhexanoate trifluoroacetate with ethyl aluminum complexes at temperatures in the range of about from 10.degree. to 80.degree. C. and pressures in the range of about from 1 to 5 atmospheres and a catalyst ratio in the range of about from 500 to 5,000 moles of C.sub.6 olefin per mole of catalyst to produce a semi-linear C.sub.12 olefin product containing at least 75% by weight of linear dodecenes and mono-branched C.sub.12 olefins.

A process for preparing C.sub.12 semi-linear alkylbenzene sulfonates consisting essentially of the steps of:

• (a) contacting a propylene feed with a selective dimerization catalyst, selective to the production of higher olefins, under dimerization conditions to produce a higher olefin product containing at least 60% by weight linear hexenes, under dimerization conditions and wherein said selective dimerization catalysts is selected from the group of:
• (1) a complex of a nickel chelate having the formula ##STR5## wherein R and R' independently are hydrogen, alkyl or aryl of up to 10 carbon atoms, or haloalkyl or haloaryl of up to 10 carbon atoms, with the proviso that the two R' groups of each chelating ligand together with the adjacent carbon atoms to which they are attached, can form a six-membered carbocyclic aromatic ring or a halogen substituted six-membered carbocyclic aromatic ring have 1 to 4 halogen substituents selected from the group of fluoro, chloro, bromo or iodo;
• with an alkyl aluminum alkoxide having the formula
• (R").sub.m Al(OR").sub.n
• wherein each R" independently is alkyl of up to 10 carbon atoms, preferably of up to 4 carbon atoms, m is a whole number from 1 to 2 inclusive and n is a whole number from 1 to 2 inclusive selected so that the sum of m and n equals 3;
• (2) a complex of bis(1,5-cyclooctadiene)nickel(O) with hexafluoro-2,4-pentanedione;
• and
• (3) a complex comprising transition metal complex selected from complexes of nickel and palladium with a fluoro-organic thiol or sulfide ligand, having a single sulfur atom in a ligating position and wherein the carbon atom adjacent the carbon atom to which the sulfur atom is attached has at least one fluoro substituent and with the proviso that said fluoro-organic thiol or sulfide does not contain any other ligating group or atom in a ligating position which will displace fluoro as a ligand, and an organometallic-reducing agent selected from the group of borohydride and organoaluminum halides and alkoxides having the formula R*.sub.m AlX.sub.n wherein R* is alkyl, aryl or arylalkyl;
• X is fluoro chloride, bromide, iodide or alkoxide and m is 1 or 2 and n is 3-m;
• (b) fractionally distilling the reaction product of step (a) to recover a C.sub.6 olefin fraction containing linear hexenes and branched C.sub.6 olefins and wherein said fraction contains 70 to 82% by weight of linear hexenes;
• (c) contacting the C.sub.6 olefin fraction of step (b) with a dimerization catalyst under dimerization conditions thereby producing a semi-linear C.sub.12 olefins product containing at least 60% by weight linear dodecenes and mono-branched C.sub.12 olefins;
• (d) recovering the semi-linear C.sub.12 olefin of step (c) and contacting said semi-linear C.sub.12 olefins with benzene in the presence of an alkylation catalyst under reactive conditions thereby producing a mixture of semi-linear C.sub.12 alkylbenzenes;
• and
• (e) recovering said semi-linear C.sub.12 alkylbenzenes and contacting said recovered semi-linear C.sub.12 alkylbenzenes with about from 1 to 1.5 moles, based on sulfur content, of a sulfonating agent per mole of said semi-linear C.sub.12 alkylbenzenes under reactive conditions thereby producing the corresponding mixture of semi-linear C.sub.12 alkylbenzene sulfonic acids having the general formula ##STR6## wherein R is semi-linear C.sub.12 alkyl and neutralizing said semi-linear C.sub.12 alkylbenzene sulfonic acids to yield the corresponding mixture of semi-linear C.sub.12 alkylbenzene sulfonate salts.

A process for preparing a mixture of semi-linear C.sub.12 alkylbenzenes containing at least 60% by weight of linear and mono-branched C.sub.12 alkylbenzenes and 10 to 40 weight % of multibranched C.sub.12 alkylbenzenes, consisting essentially of the steps of:

• (a) contacting a propylene feed with a selective dimerization catalyst, selective to the production of higher olefins, under dimerization conditions to produce a higher olefin product containing at least 60% by weight linear hexenes, under dimerization conditions and wherein said selective dimerization catalyst is selected from the group of:
• (1) a complex of a nickel chelate having the formula ##STR7## wherein R and R' independently are hydrogen, alkyl or aryl of up to 10 carbon atoms, or haloalkyl or haloaryl of up to 10 carbon atoms, with the proviso that the two R' groups of each chelating ligand together with the adjacent carbon atoms to which they are attached, can form a six-membered carbocyclic aromatic ring or a halogen substituted six-membered carbocyclic aromatic ring have 1 to 4 halogen substituents selected from the group of fluoro, chloro, bromo or iodo;
• with an alkyl aluminum alkoxide having the formula
• (R").sub.m Al(OR").sub.n
• wherein each R" independently is alkyl of up to 10 carbon atoms, preferably of up to 4 carbon atoms, m is a whole number from 1 to 2 inclusive and n is a whole number from 1 to 2 inclusive selected so that the sum of m and n equals 3;
• (2) a complex of bis(1,5-cyclooctadiene)nickel(O) with hexafluoro-2,4-pentanedione;
• and
• (3) a complex comprising transition metal complex selected from complexes of nickel and palladium with a fluoro-organic thiol or sulfide ligand, having a single sulfur atom in a ligating position and wherein the carbon atom adjacent the carbon atom to which the sulfur atom is attached has at least one fluoro substituent and with the proviso that said fluoro-organic thiol or sulfide does not contain any other ligating group or atom in a ligating position which will displace fluoro as a ligand, and an organometallic-reducing agent selected from the group of borohydride and organoaluminum halides and alkoxides having the formula R*.sub.m AlX.sub.n wherein R* is alkyl, aryl or arylalkyl;
• X is fluoro chloride, bromide, iodide or alkoxide and m is 1 or 2 and n is 3-m;
• (b) fractionally distilling the reaction product of step (a) to recover a C.sub.6 olefin fraction containing linear hexenes and branched C.sub.6 olefins and wherein said fraction contains 70 to 75% by weight of linear hexenes;
• and
• (c) contacting the C.sub.6 olefin fraction of step (b) with a dimerization catalyst under dimerization conditions thereby producing a semi-linear C.sub.12 olefins product containing at least 60% by weight linear dodecenes and mono-branched C.sub.12 olefins and 10 to 40% by weight multibranched C.sub.12 olefins;
• and
• (d) recovering the semi-linear C.sub.12 olefins product of step (c) and contacting the recovered semi-linear C.sub.12 olefins product with benzene in the presence of an alkylation catalyst under reactive conditions thereby producing a mixture of semi-linear C.sub.12 alkylbenzenes containing at least 60% by weight of linear and monobranched C.sub.12 alkylbenzenes and 10 to 40 weight % of multibranched C.sub.12 alkylbenzenes.

A process for preparing a mixture of semi-linear C.sub.12 alkylbenzenes containing at least 60% by weight of linear and mono-branched C.sub.12 alkylbenzenes consisting essentially of the steps of:

• (a) contacting a propylene feed containing at least about 90% by weight propylene with a selective dimerization catalyst selected from the group of hexafluoroacetoacetyl nickel cyclooctyldiene or bis[pentafluorophenylthio]nickel with triethyl aluminum sesquichloride under dimerization conditions at temperatures in the range of about from 50.degree. to 80.degree. C. and pressures in the range of about 10 to 40 atmospheres using a catalyst ratio in the range of about from 1,000 to 50,000 mole of propylene per mole of catalyst to yield dimer product containing at least about 60% by weight of linear hexenes and the remainder higher olefins, branched C.sub.6 olefins and unreacted propylene;
• (b) fractionally distilling the reaction product of step (a) to recover a C.sub.6 olefin fraction containing from 70 to 75% by weight linear hexenes;
• (c) contacting the C.sub.6 olefin fraction product of step (b) with a dimerization catalyst selected from the group of hexafluoroacetoacetyl nickel cyclooctadiene;
• bis[pentafluorophenylthio]nickel with triethyl aluminum sesquichloride;
• bis[triphenylphosphino]nickel dicarbonyl with aluminum chloride;
• nickel 2-ethylhexanoate trifluoroacetate with diethyl bis-aluminum tetrachloride;
• and nickel 2-ethylhexanoate trifluoroacetate with ethyl aluminum at temperatures in the range of about from 10.degree. to 80.degree. C. and pressures in the range of about from 1 to 5 atmospheres and a catalyst ratio in the range of about from 500 to 5,000 moles of C.sub.6 olefin fraction per mole of catalyst to produce a semi-linear C.sub.12 olefin product containing at least 60% by weight of linear dodecenes and mono-branched C.sub.12 olefins and 10 to 40 weight % multibranched C.sub.12 olefins;
• and
• (d) recovering the semi-linear C.sub.12 olefins of step (c) and contacting said semi-linear C.sub.12 olefins with benzene in the presence of an alkylation catalyst under reactive conditions thereby producing a mixture of semi-linear C.sub.12 alkylbenzenes containing at least 60 weight % of linear and mono-branched C.sub.12 alkylbenzenes and 10 to 40 weight % multibranched C.sub.12 alkylbenzenes.

A process for preparing a mixture of semi-linear C.sub.12 alkylbenzene sulfonates containing at least weight % of linear and mono-branched alkylbenzene sulfonate and 10 to 40 weight % multibranched C.sub.12 alkylbenzene sulfonates consisting essentially of the steps of:

• (a) contacting a propylene feed with a selective dimerization catalyst, selective to the production of higher olefins, under dimerization conditions to produce a higher olefin product containing at least 60% by weight linear hexenes, under dimerization conditions and wherein said selective dimerization catalyst is selected from the group of:
• (1) a complex of a nickel chelate having the formula ##STR8## wherein R and R' independently are hydrogen, alkyl or aryl of up to 10 carbon atoms, or haloalkyl or haloaryl of up to 10 carbon atoms, with the proviso that the two R' groups of each chelating ligand together with the adjacent carbon atoms to which they are attached, can form a six-membered carbocyclic aromatic ring or a halogen substituted six-membered carbocyclic aromatic ring have 1 to 4 halogen substituents selected from the group of fluoro, chloro, bromo or iodo;
• with an alkyl aluminum alkoxide having the formula
• (R").sub.m Al(OR").sub.n
• wherein each R" independently is alkyl of up to 10 carbon atoms, preferably of up to 4 carbon atoms, m is a whole number from 1 to 2 inclusive and n is a whole number from 1 to 2 inclusive selected so that the sum of m and n equals 3;
• (2) a complex of bis(1,5-cyclooctadiene)nickel(O) with hexafluoro-2,4-pentanedione;
• and
• (3) a complex comprising transition metal complex selected from complexes of nickel and palladium with a fluoro-organic thiol or sulfide ligand, having a single sulfur atom in a ligating position and wherein the carbon atom adjacent the carbon atom to which the sulfur atom is attached has at least one fluoro substituent and with the proviso that said fluoro-organic thiol or sulfide does not contain any other ligating group or atom in a ligating position which will displace fluoro as a ligand, and an organometallic-reducing agent selected from the group of borohydride and organoaluminum halides and alkoxides having the formula R*.sub.m AlX.sub.n wherein R* is alkyl, aryl or arylalkyl;
• X is fluoro chloride, bromide, iodide or alkoxide and m is 1 or 2 and n is 3-m;
• (b) fractionally distilling the reaction product of step (a) to recover a C.sub.6 olefin fraction containing linear hexenes and branched C.sub.6 olefins and wherein said fraction contains 70 to 75% by weight of linear hexenes;
• and
• (c) contacting the C.sub.6 olefin fraction of step (b) with a dimerization catalyst under dimerization conditions thereby producing a semi-linear C.sub.12 olefins product containing at least 60% by weight linear dodecenes and mono-branched C.sub.12 olefins and 10 to 40% by weight multibranched olefins;
• and
• (d) recovering the semi-linear C.sub.12 olefins of step (c) and contacting said semi-linear C.sub.12 olefins with benzene in the presence of an alkylation catalyst under reactive conditions thereby producing a mixture of semi-linear C.sub.12 alkylbenzenes containing at least 60% by weight of linear and mono-branched C.sub.12 alkylbenzenes and 10 to 40 weight % of multibranched C.sub.12 alkylbenzenes;
• and
• (e) recovering said semi-linear C.sub.12 alkylbenzenes and contacting said recovered semi-linear C.sub.12 alkylbenzenes with about from 1 to 1.5 moles, based on sulfur content, of a sulfonating agent per mole of said semi-linear C.sub.12 alkylbenzenes under reactive conditions thereby producing the corresponding mixture of semi-linear C.sub.12 alkylbenzene sulfonic acids having the general formula ##STR9## wherein R is semi-linear C.sub.12 alkyl and neutralizing said semi-linear C.sub.12 alkylbenzene sulfonic acids to yield the corresponding mixture of semi-linear C.sub.12 alkylbenzene sulfonate salts containing 10 to 40% by weight multibranched C.sub.12 alkylbenzene sulfonate salts.

A process for preparing semi-linear C.sub.12 alkylbenzene sulfonates containing at least 75% by weight of linear and mono-branched C.sub.12 alkylbenzene sulfonates which comprises the steps of:

• (a) contacting a propylene feed with a selective dimerization catalyst, selective to the production of higher olefins, under dimerization conditions to produce a higher olefin product containing at least 60% by weight linear hexenes, under dimerization conditions and wherein said selective dimerization catalysts is selected from the group of:
• (1) a complex of a nickel chelate having the formula ##STR10## wherein R and R' independently are hydrogen, alkyl or aryl of up to 10 carbon atoms, or haloalkyl or haloaryl of up to 10 carbon atoms, with the proviso that the two R' groups of each chelating ligand together with the adjacent carbon atoms to which they are attached, can form a six-membered carbocyclic aromatic ring or a halogen substituted six-membered carbocyclic aromatic ring have 1 to 4 halogen substituents selected from the group of fluoro, chloro, bromo or iodo;
• with an alkyl aluminum alkoxide having the formula
• (R").sub.m Al(OR").sub.n
• wherein each R" independently is alkyl of up to 10 carbon atoms, preferably of up to 4 carbon atoms, m is a whole number from 1 to 2 inclusive and n is a whole number from 1 to 2 inclusive selected so that the sum of m and n equals 3;
• (2) a complex of bis(1,5-cyclooctadiene)nickel(O) with hexafluoro-2,4-pentanedione;
• and
• (3) a complex comprising transition metal complex selected from complexes of nickel and palladium with a fluoro-organic thiol or sulfide ligand, having a single sulfur atom in a ligating position and wherein the carbon atom adjacent the carbon atom to which the sulfur atom is attached has at least one fluoro substituent and with the proviso that said fluoro-organic thiol or sulfide does not contain any other ligating group or atom in a ligating position which will displace fluoro as a ligand, and an organometallic-reducing agent selected from the group of borohydride and organoaluminum halides and alkoxides having the formula R*.sub.m AlX.sub.n wherein R* is alkyl, aryl or arylalkyl;
• X is fluoro chloride, bromide, iodide or alkoxide and m is 1 or 2 and n is 3-m;
• (b) fractionally distilling the reaction product of step (a) to recover a C.sub.6 olefin fraction containing linear hexenes and branched C.sub.6 olefins and wherein said fraction contains 70 to 82% by weight of linear hexenes;
• (c) treating the C.sub.6 olefin fraction recovered from step (b) with aqueous sulfuric acid under reactive conditions at temperatures below about 30.degree. C. thereby yielding a two liquid phase mixture comprising a C.sub.6 olefin phase having a linear olefin content of at least about 80% by weight and an aqueous phase containing soluble nonlinear olefin sulfonates and recovering said C.sub.6 olefin phase from said aqueous phase;
• (d) contacting the C.sub.6 olefin phase recovered in step (c) with a dimerization catalyst under dimerization conditions thereby producing a semi-linear C.sub.12 olefin product containing at least 75% by weight linear dodecenes and mono-branched C.sub.12 olefins;
• (e) recovering the semi-linear C.sub.12 olefins of step (d) and contacting said semi-linear C.sub.12 olefins with benzene in the presence of an alkylation catalyst under reactive conditions thereby producing a mixture of semi-linear C.sub.12 alkylbenzenes corresponding to said C.sub.12 olefins;
• and
• (f) recovering said semi-linear C.sub.12 alkylbenzenes and contacting said recovered semi-linear C.sub.12 alkylbenzenes with about from 1 to 1.5 moles, based on sulfur content, of a sulfonating agent per mole of said semi-linear C.sub.12 alkylbenzenes under reactive conditions thereby producing the corresponding mixture of semi-linear C.sub.12 alkylbenzene sulfonic acids having the general formula ##STR11## and neutralizing said semi-linear C.sub.12 alkylbenzene to yield the corresponding mixture of semi-linear C.sub.12 alkylbenzene sulfonic acids sulfonate salts containing at least 75% by weight of linear and mono-branched C.sub.12 alkylbenzene sulfonate salts.

A process for preparing semi-linear C.sub.12 alkylbenzene sulfonates containing at least 75% by weight linear and mono-branched C.sub.12 alkylbenzene sulfonates which comprises the steps of:

• (a) contacting a propylene feed containing at least about 90% by weight propylene with a selective dimerization catalyst selected from the group of hexafluoroacetoacetyl nickel cyclooctyldiene or bis[pentafluorophenylthio]nickel with triethyl aluminum sesquichloride under dimerization conditions at temperatures in the range of about from 50.degree. to 80.degree. C. and pressures in the range of about 10 to 40 atmospheres using a catalyst ratio in the range of about from 1,000 to 50,000 mole of propylene per mole of catalyst to yield dimer product containing at least about 60% by weight of linear hexenes and the remainder higher olefins, branched C.sub.6 olefins and unreacted propylene;
• (b) fractionally distilling the reaction product of step (a) to recover a C.sub.6 olefin fraction containing about from 70 to 82% by weight linear hexenes;
• (c) treating the C.sub.6 olefin fraction recovered from step (b) with aqueous sulfuric acid under reactive conditions at temperature below about 30.degree. C. to yield a two liquid phase mixture comprising a C.sub.6 olefin phase having a linear olefin content of at least about 80% by weight and an aqueous phase containing soluble non-linear olefin sulfonates and recovering said C.sub.6 olefin phase from said aqueous phase;
• (d) contacting the C.sub.6 olefin phase recovered in step (c) with a dimerization catalyst selected from the group of hexafluoroacetoacetyl nickel cyclooctadiene;
• bis[pentafluorophenylthio]nickel with triethyl aluminum sesquichloride;
• bis[triphenylphosphino]nickel dicarbonyl with aluminum chloride;
• nickel 2-ethylhexanoate trifluoroacetate with diethyl bis-aluminum tetrachloride;
• and nickel 2-ethylhexanoate trifluoroacetate with ethyl aluminum complexes at temperatures in the range of about from 10.degree. to 80.degree. C. and pressures in the range of about from 1 to 5 atmospheres and a catalyst ratio in the range of about from 500 to 5,000 moles of C.sub.6 olefin per mole of catalyst to produce a semi-linear C.sub.12 olefin product containing at least 75% by weight of linear dodecenes and mono-branched C.sub.12 olefins;
• (e) recovering the semi-linear C.sub.12 olefins of step (d) and contacting said semi-linear C.sub.12 olefins with benzene in the presence of an alkylation catalyst under reactive conditions thereby producing a mixture of semi-linear C.sub.12 alkylbenzenes corresponding to said C.sub.12 olefins;
• and
• (f) recovering said semi-linear C.sub.12 alkylbenzenes and contacting said recovered semi-linear C.sub.12 alkylbenzenes with about from 1 to 1.5 moles, based on sulfur content, of a sulfonating agent per mole of said semi-linear C.sub.12 alkylbenzenes under reactive conditions thereby producing the corresponding mixture of semi-linear C.sub.12 alkylbenzene sulfonic acids having the general formula ##STR12## and neutralizing said semi-linear C.sub.12 alkylbenzene to yield the corresponding mixture of semi-linear C.sub.12 alkylbenzene sulfonate salts containing at least 75% by weight of linear and mono-branched C.sub.12 alkylbenzene sulfonate salts.