OP-20与DSS二元复合驱油体系定量研究OA

A novel method was developed for detecting the binary surfactant compound system of OP-20(octylphenol polyoxyethylene ether)and DSS(sodium dodecyl sulfonate).The absorbance and critical micelle concentration ccmc of OP-20 in the compound system were influenced by DSS,making it impossible to accurately determine the OP-20 concentration using UV spectroscopy.Upon adding 0.300 mmol/L of DSS,the absorbance of 0.180 mmol/L OP-20 at the maximum absorption wavelength of 223 nm rose from 1.582 to 1.642,while the ccmc of OP-20 decreased from 0.193 mmol/L to 0.182 mmol/L.The results show that the addition of β-CD can destroy the aggregation of OP-20 into micelles,and reduce the influence of DSS on the determination of OP-20 concentration in the compound system.After adding β-CD to OP-20,ccmc is no longer detected,and the absorbance of 0.180 mmol/L OP-20 in 0.300 mmol/L DSS solutions increases slightly from 1.634 to 1.638,increasing by only 0.20%.It can be seen that the addition of β-CD is beneficial to improve the detection accuracy of OP-20 concentration in the combination system by UV spectroscopy.The findings indicate that OP-20 does not significantly influence the detection of DSS conductivity,and the conductivity method can effectively measure the concentration of DSS in the compound system.The results of Job′s method,FT-IR and 1 H-NMR show that OP-20 enters into the β-CD cavity to form n(β-CD)∶n(OP-20)=1∶1 inclusion compound.It is the cause that β-CD eliminates the interference of DSS on OP-20 and prevents the formation of OP-20 micelles in the compound system.