Quantitative Analysis Of Heavy Alkylbenzene Sulfonate In Water

In today's society oil plays a more and more important role .With the economic development and the progress of human civilization the demand for oil is increasing.The first oil extraction and the twice oil extraction produced only 40-60 percent of crude oil reserves, and most of the oil residue in the underground. With the development of technology, strengthen the recovery technology (EOR) has won people's attention, ASP flooding (ASP) is a new technology of chemical multi-gas, its characteristic is to use surfactants, polymer and alkali synergy, make compound system/oil formation of super-low interfacial tension. (ASP) composite drive technology plays a key role of surfactant, because is affecting surfactant play oil displacement efficiency and effect of oil and oil displacement system of interfacial tension.Effect the value of the interfacial tension of factors include: mixed surfactants, alkali, polymers, etc. HABS were found to have low interfacial tension, best morphology and the strong ability, and the sources of the raw materials, is a kind of excellent surfactant. Therefore the heavy alkylbenzene sulfonates, has important significance to improve the content of the oil rate, and for the sustainable development of national economy.UV single wavelength method has studied on alkylbenzene sulfonates,the results showed that the basic method can be used in testing work. But on the site conditions, due to the complex use of high salinity water factory, join the complex mixture situation, but because the base oil displacement process, cause ternary liquid and complex effluence , so sulfonates for adaptive stronger method is very important. Three wavelengths ultraviolet spectrophotometry by choosing proper three wavelengths absorbency, through the absorbency of differential operation can be eliminated by the absorption spectra turbid solution, and quantitative analysis on interference material, has strong ability of resisting background interference.In this paper,we select three-wavelength method to determine the content of alkylbenzene sulfonates . Through the interference of daqing water, mix ingredients, By uv spectral scanning, determine the extent of the interference of daqing water is the largest, the second is mixed-alkali, finally is polyacrylamide. Select the maximum absorption wavelength of daqing water forλ1, alkylbenzene sulfonates in daqing water for the maximum absorption wavelength isλ2, through the analysis method and calculation formula a third wave is determined toλ3. The establishmentΔA - C three wavelengths standard curve.Through the experimental condition and optimization of each index (linear, precision, accuracy, and recovery of error ), this paper concluded:1. Alkylbenzene sulfonates weighs its characteristics in different environments, just absorption peaks unchanged due to different environment background absorption spectrophotometry the superposition and increase occurred, through the appropriate methods to eliminate background on the absorption of can finish heavy alkylbenzene sulfonates quantitative analysis.2. The main factors affecting the ultraviolet absorbing is daqing water, then turn to mixed-alkali solution, polymers, their absorption peaks are basically the same.3. Three-wavelength method for determination of heavy alkylbenzene sulfonates concentration for 5-60 mg/L, corresponding percent concentration is 0.025% - 0.3%. The minimum detection limit for 5mg/L,it is important for small concentrations of alkyl benzene sulfonates content is determined .4. Linearity basically reach more than 0.99977,and the rang of standard deviation is 0.014-0.125mg/L,sthandard deviation is small,the error between of +0.053%-+0.113%,and the testing the recovery rate is 99.76%-100.07%.5. The experimental investigation the influence of daqing water, mix-alkali,and polymer to alkylbenzene sulfonates determination, experiments prove that the method can reduce by dilute daqing water, mix-alkali, and polyamer . and errors are within acceptable limits.6. Finally investigation the influence of inorganic ions on the determination results. Experiments show that the experiment of inorganic ions in a small degree disturbance, acceptable range.From the above results can be seen, the determination method of three wavelengths for low concentration of heavy water alkylbenzene sulfonates,is an effective analyzing method.all the indicators of good within acceptable limits.