Adewunmi Ahmad A, Kamal Muhammad Shahzad, Hussain Syed Muhammad Shakil
Center for Integrative Petroleum Research, College of Petroleum Engineering and Geosciences, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
Petroleum Engineering Department, College of Petroleum Engineering and Geosciences, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
ACS Omega. 2024 Nov 25;9(49):48405-48415. doi: 10.1021/acsomega.4c06634. eCollection 2024 Dec 10.
This study reports the demulsification activity of a newly developed nonionic demulsifier (NID) via the condensation of glycolic acid ethoxylate lauryl ether with amine. The demulsification performance of the developed NID was assessed under room and moderate temperatures (25 and 60 °C), while the concentrations of NID were varied from 100 to 700 ppm at both temperatures in order to observe their oil-water separation efficiency. The demulsification mechanism was expatiated by determining the viscosity and elastic modulus of emulsion in the presence and absence of the NID. Adsorption at the oil and water interface was analyzed through a series of interfacial tension measurements. Accordingly, under the aforementioned temperatures, the optimal demulsification efficiency of the NID was 95% (25 °C) and 99% (60 °C) at 500 ppm. Viscosity determination at both temperatures revealed a drastic reduction in emulsion viscosity in the presence of NID, and the viscosity drop was of high magnitude at moderate temperatures (60 °C). Likewise, the elastic modulus measurements in bulk rheology revealed that the presence of NID in the emulsion weakened the elastic strength. Again, the interfacial modulus test exhibited the percolation of NID at the oil-water interface and the displacement of asphaltenes. Interfacial tension (IFT) measurements of the oil-water system at different NID concentrations showed that the particles were adsorbed at the oil-water interface. The IFT values of the oil-water system in the presence of NID ranged from 1.84 to 3.02 mN/m as compared to that of the NID-free oil-water system recorded as 16.11 mN/m. It is envisaged that this new nonionic demulsifier would be very useful in oilfields and petrochemical industries.
本研究报告了一种新开发的非离子破乳剂（NID）的破乳活性，该破乳剂通过乙醇酸乙氧基化月桂基醚与胺缩合而成。在室温和中温（25和60°C）下评估了所开发的NID的破乳性能，同时在这两个温度下将NID的浓度从100 ppm变化到700 ppm，以观察它们的油水分离效率。通过测定在有和没有NID的情况下乳液的粘度和弹性模量来阐述破乳机理。通过一系列界面张力测量分析了在油和水界面的吸附情况。因此，在上述温度下，NID在500 ppm时的最佳破乳效率在25°C时为95%，在60°C时为99%。在两个温度下的粘度测定表明，在存在NID的情况下乳液粘度急剧降低，并且在中温（60°C）下粘度下降幅度很大。同样，本体流变学中的弹性模量测量表明，乳液中存在NID会削弱弹性强度。此外，界面模量测试表明NID在油水界面渗透并取代了沥青质。在不同NID浓度下对油水体系的界面张力（IFT）测量表明，颗粒吸附在油水界面。与无NID的油水体系记录的16.11 mN/m相比，存在NID的油水体系的IFT值范围为1.84至3.02 mN/m。预计这种新型非离子破乳剂在油田和石化行业将非常有用。
