Study On The Determination Method Of Heavy Alkylbenzene Sulfonate In Water

Heavy Alkylbenzene Sulfonate (HABS) are the focus of domestic research and development of performance, low-cost EOR surfactant enhanced oil recovery at an extremely important position. Surfactant in ASP plays an extremely important role. In recent years, the analysis of workers in the detection of heavy alkylbenzene sulfonates on Ways to do a lot of research work, and constantly explore new method, thus, on the water content of heavy alkylbenzene sulfonates have quantitative detection oil exploration has become the basic mission has always been the job. The entire national economy for the sustainable development of great significance.Anionic Surfactants in Water Determination of methods spectrophotometry, two-phase titration, HPLC, thin layer chromatography and ion-selective electrode analysis and other methods. Heavy Alkylbenzene Sulfonate for example, is a mixture of alkyl benzene sulfonate, and its UV absorption spectrum of the functional group identification, which is the root of the benzene ring with a sulfonic acid is a conjugated system in the UV absorption spectra of molecules with a ribbon. Therefore, it can be the basis of Lambert- Beer's law to establish a set of heavy alkylbenzene sulfonates in water by ultraviolet analysis.In this paper, the main job are at between 200-900nm wavelength, small to large series of alkylbenzene sulfonate preparation of standard solution, select the appropriate concentration, which can be caused by UV absorption measurement signal can get the maximum absorption wavelength . At the same time, also looked at when the alkyl chain length, structure and replace the location at the same time, the impact of the maximum absorption wavelength. The results show that at the concentration range of 100 ~ 1900mg / L, the determination of heavy alkylbenzene sulfonates of the maximum absorption wavelength of 272nm, and the maximum absorption wavelength has not been the impact of alkyl chain. Daqing EOR can choose to use heavy alkylbenzene sulfonates used as a standard material for working curve. In this study, the wavelength at 272nm, the out set up a number of different linear range of standard curves, and associated measured the concentration of unknown samples, the determination of the results of the calculation error, standard deviation and recovery.In the experiment, also observed the heavy alkylbenzene sulfonates instability. We are equipped to take the current approach, to eliminate because of the instability brought about by the interference of the experimental results.In this paper, the analytical work carried out interference experiments, inspected a number of inorganic ions (Na +, K +, Ca2 +), polymer, mixed-alkali and organic solvents on the determination results. The results show that the UV absorption spectrometry determination of the concentration of unknown samples, methods, accuracy, and interference factors such as the ion impact on the experimental results are very small.At harvest in the field, has been using a two-phase titration method to determine the show that the concentration of surfactant solution. This approach to toxic chloroform as extractant to Haiming 1622 as a titrant, using imported BDH indicator titration at the end of the color from pale pink become the basis for determining a measured. Disadvantage of this method can only be measured are relatively small concentration of surfactant concentration. Titration end point because with the lag, it is not easy to observe, so relatively large measurement error. In this paper, another work is to set up the UV absorption spectrometry determination of the results with the two-phase titration method of comparison, studies have shown that results in error, standard deviation, and other indicators of recovery, UV absorption spectroscopy are superior to two-phase titration.Through the comparison of two methods, the paper drew the following conclusions:1. By ultraviolet absorption spectrometry to determine the water content of heavy alkylbenzene sulfonates, method is fast, efficient, and the popularization of the merits. The results of the analysis error of -0.013% at 0.2% between the standard deviation of 0.002% ~ 2% range. Can be seen with the two-phase titration methods, UV spectroscopy of the error and standard deviation are small, both in the acceptable range.2. UV absorption spectrometry determination of low concentration can the active agent, Daqing Petroleum Three mining, the injection wellhead surfactant concentration at 10 ~ 1000mg / L, such a large concentration gradient of the measured two-phase titration methods are unable to reach.3. UV because of the use of digital UV Spectrophotometer, can make determination of digitization, information technology, rapid real-time online detection intelligent. That is, determination of methods and modern information systems in monitoring the implementation by the interior line monitoring of changes in the scene, which makes the exploitation of oil field job greatly improve work efficiency.