Synthesis And Surface Activities Of The4,4’-diacyl Ethylene Glycol Diphenyl Ether Disulfonate Gemini Surfactants

In this paper, ethylene glycol diphenyl ether is synthesized by1,2-dibromoethanereacting with phenol by the chemical action of Williamon. Then, Four kinds of acyl chloridewere obtained by the chemical action of12to18carbon carboxylic acid and thionyl chloride,respectively, and the ethylene glycol diphenyl ether was acylated by them under the Friedel-Craft acylation condition. The obtained acylated products were further sulfonated bychlorosulfonic acid,then neutralized with aqueous sodium hydroxide. The structures of theintermediate products and the target compounds are identified by IR and1H NMR.The optimum reaction conditions of williamson, Friedel-Crafts acylation andsulfonation are determined by simple comparison method of experimental design ofdidoecanoyl diacyl ethylene glycol diphenyl ether disulfonate gemini surfactants.Their higher surface activities are showed by the result of measurement of surfacetension, Krafft temperature, emulsifying property and foaming property. The result shows that:every of them has low cmc. The cmc of Gemini-18is lowest, which reaches10-5mol/L.And γcmcof it touchs29.73mN/m. Meanwhile, the four kinds of Gemini surfactants exhibitexcellent water solubility and lower Krafft points. Furthermore, emulsifying and foamingproperties of the target products are better. And the four kinds of products can be applied aslatex, detergent, emulsifier which using in soluble emulsion in pesticides and so on. Thestructure-activity relationship of Gemini-n is discussed in this article as well. The resultnotes that with the increasing of the carbon number of the hydrocarbon chain, cmc decreases,Krafft point increases, foaming property enhances, emulsifying property weakens.In this paper, the oil/water interface tension of the four kinds of the new Gemini-n istested, and the oil is come from Liaohe Oilfield. The experimental result shows that: the testresult of a single component is not satisfactory. Based on the formulation principle of thesurfactant, the optimal proportion of the mixtures of Gemini surfactants, SDBS and Na2CO3isachieved by orthogonal experiment in order to the interface tension is lowest. And everymixed systems can make the interface tension reduce to10-4mN/m. And the optimal mixturecan even reduce the interface tension to10-5mN/m, whice indicating that there is a goodsynergistic effect among Gemini-12, SDBS and Na2CO3. Finally, the best mixed systems are applied to the oil sand separation. We achieve goodresults. The wash oil rate of two kinds of the mixed systems can reach70%or more, andpotential applications are presented.