Synthesis And Performance Of Sodium Dialkylated Diphenyl Ether Disulfonate

Sodium dialkylated diphenyl ether disulfonates?C_n-DADS?,gemini surfactants,have good performance and wide application prospects.The C_n-DADS with different structures were synthesized.The effects of hydrophobic chain structure of C_n-DADS on performance were studied.In addition,the performance differences between di-dodecyl diphenyl ether disulfonate(C₁₂-DADS),sodium mono-dodecyl diphenyl ether disulfonate(C₁₂-MADS)and sodium linear alkylbenzene sulfonate(C₁₂-LAS)were compared.The thesis consists of four parts.1.Triethylamine hydrochloride/aluminium chloride?Et₃NHCl-AlCl₃?ionic liquid was synthesized and used to catalyze alkylation of diphenyl ether with 1-dodecene.Optimal conditions of the alkylation reaction by the orthogonal experimental method are catalyst dosage of 0.045 mol,reaction temperature of 70?and reaction time of 1 h.The conversion of diphenyl ether reaches 98.1%,the selectivity of dialkyl diphenyl ether is33.7%under the optimal conditions.In addition,the influence of catalyst structure on its catalytic activity was investigated by changing the cationic and anionic part structure of ion liquids.The result shows that the catalytic activity of ionic liquids is determined by anionic part.Optimal combination are EtNH₃Cl and AlCl₃.2.The effects of molecular structure on surface tension,salt and calcium tolerance,interfacial tension and wettability of di-dodecyl diphenyl ether disulfonate(C₁₂-DADS),C₁₂-MADS and C₁₂-LAS were investigated.The results are as follow:?1?critical micelle concentration?cmc?increases in the order C₁₂-DADS<C₁₂-MADS<C₁₂-LAS.?2?The surface tensions at cmc(?_cmc)decreases in the order C₁₂-DADS>C₁₂-LAS>C₁₂-MADS.?3?Diffusion coefficients of C₁₂-DADS and C₁₂-MADS are lower than that of C₁₂-LAS.?4?the minimum interfacial tension decreases in the order C₁₂-DADS>C₁₂-LAS>C₁₂-MADS.?5?Wettability decreases in the order C₁₂-DADS?C₁₂-LAS>C₁₂-MADS.3.The effects of branching degree on properties were investigated for C₁₂-DADS.The result shows that the increase of branching degree leads to the decrease of the cmc,?_cmcmc and salt and calcium tolerance,the increase of diffusion coefficient,interfacial performance and wettability.4.The effects of length and branching degree of hydrophobic chain on application performance of C_n-DADS were investigated.The differences of application performance between C₁₂-DADS,C₁₂-MADS and C₁₂-LAS were compared.The result are as follow:?1?foamability and foam stability of C_n-DADS decrease with the increase of carbon chain length.The order of decreasing foamability and foam stability is C₁₂-LAS>C₁₂-MADS>C₁₂-DADS.Branching chain structure causes the increase of foamability,but has a little impact on foam stability.?2?Compared with C₈-DADS,C₁₀-DADS,C₁₂-MADS,C₁₂-branch DADS and C₁₂-LAS,C₁₂-DADS has a good emulsification ability.?3?The surfactants structure have no significant influence on performance of polymer emulsion.The polymer emulsions have high solid content,low condensation rate,small partical size and good emulsion stability.