Synthesis And Investigation Of New Series Of Diquaternary Ammonium Salts

In the refilling wastewater of oilfield, sulfate reduction bacteria, saprophyte bacteria andiron bacteria cause the stratum plugged and facilities corrosion. So far, the main method ofcontrolling the bacteria in wastewater still is adding bactericide. And 1227 is mainly used inoilfield. However, with time going, the bacteria have drug resistance gradually, which enhancedthe using expense. Therefore, it is necessary to explore a series of novel bactericide with greatefficiency and low cost to trade off with 1227.In this paper, three series of diquarternary ammonium salt have been synthesized and thepurity of the productions has been examined through Melting point and Element analysis. ThenThe structure of the productions were testified by IR spectra. As a result, it was found that theactual structure was identical with the theoretic. By detecting the active substance in theproductions, we observe that the content is quiet high, especially Gemini (C12N)2O and (C12N)2φ, the purity of which are 99.52% and 99.73%repectively.First, we detected the surface tension of Gemini surfactants at 25℃ and got the criticalmicelle concentration (CMC) values, the surface tension at their CMC(γCMC) and theefficiency of decreasing the surface tension (C20). Then it was noticed that the γCMC ofGemini surfactants agreed with the corresponding common surfactants. Whereas, the CMC andC20 are lower 1-3 order of magnitude. According to the Gibbs theory, A conclusion can bedrawn that the excess absorption amount (Γmax)of Gemini surfactants is less than commonsurfactants and the area of molecule (Amin)is larger however. Finally we measured theconductance behavior of water solution to Gemini surfactants so as to get CMC again. The resultapproached primary conclusion.The sterilization effects of Gemini surfactants and 1227 to sulfate reduction bacteria,saprophyte bacteria and iron bacteria have been evaluated. The results showed that sterilizationrates exceeded 97%. Gemini (C12N)2O and (C12N)2φ are better than gemini 12-3-12 and 1227.