Surfactants are extensively employed in the cold production of heavy oil.However,producing heavy oil emulsions using conventional surfactants poses a challenge to spontaneous demulsification,necessitating the addition...Surfactants are extensively employed in the cold production of heavy oil.However,producing heavy oil emulsions using conventional surfactants poses a challenge to spontaneous demulsification,necessitating the addition of demulsifiers for oil-water separation.This inevitably increases the exploitation cost and environmental pollution risk.Switchable surfactants have garnered much attention due to their dual capabilities of underground heavy oil emulsification and surface demulsification.This study focuses on the fundamental working principles and classification of novel switchable surfactants for oil displacement developed in recent years.It offers a comprehensive overview of the latest advances in the applications of switchable surfactants in the fields of enhanced oil recovery(EOR),oil sand washing,and oil-water separation.Furthermore,it highlights the existing challenges and future development directions of switchable surfactants for heavy oil recovery.展开更多
This article reports the development of a novel switchable Pickering emulsion with rapid CO_(2)/N_(2) respon-siveness,which is stabilized using alumina nanoparticles hydrophobized in situ with a trace amount of a swit...This article reports the development of a novel switchable Pickering emulsion with rapid CO_(2)/N_(2) respon-siveness,which is stabilized using alumina nanoparticles hydrophobized in situ with a trace amount of a switchable superamphiphile via electrostatic interactions.With the introduction of CO_(2) for 30 s,the Pickering emulsion can be spontaneously demulsified with complete phase separation;the emulsion can then be reconstructed in response to N_(2) purging for 10 min followed by homogenization.Moreover,the stable Pickering emulsion can be stored for more than 60 days at room temperature with-out any visible change.The CO_(2)/N_(2)-responsive behavior of the switchable Pickering emulsion is attribu-ted to the reversible desorption/adsorption of the switchable surfactants on the surfaces of the alumina nanoparticles upon the alternative bubbling of CO_(2)or N_(2).Thanks to the simple fabrication of the surfac-tant and the hydrophobization of the alumina nanoparticles,this research has developed an extremely facile and cost-efficient method for preparing a rapidly CO_(2)/N_(2)-responsive switchable Pickering emul-sion.The dosage of the switchable surfactants has been significantly reduced by nearly 1500 times(from 150 to 0.1 mmol·L^(-1))as compared with the dosage used in previous studies.Moreover,the as-prepared CO_(2)/N_(2)-responsive switchable Pickering emulsion is environmentally friendly,mild,and nontoxic;thus,it holds great potential for practical applications with considerable economic and environmental benefits,such as oil transport,fossil fuel production,environmental gases detection,and the encapsulation and release of active ingredients.展开更多
基于动态亚胺键特殊的pH响应特性,构筑具有pH可逆响应的表面活性剂及其自组装体系是近年来表面活性剂物理化学领域的热点之一,但是两性离子型的动态亚胺键表面活性剂尚未见报导。为此,设计并合成一种带有磺基甜菜碱亲水基的芳香醛(FPSA,...基于动态亚胺键特殊的pH响应特性,构筑具有pH可逆响应的表面活性剂及其自组装体系是近年来表面活性剂物理化学领域的热点之一,但是两性离子型的动态亚胺键表面活性剂尚未见报导。为此,设计并合成一种带有磺基甜菜碱亲水基的芳香醛(FPSA,(CHO)C_(6)H_(4)OCH_(2)CH_(2)N^(+)(CH_3)_(2)CH_(2)CH_(2)CH_(2)SO_(3)^(-))的前驱体,并与脂肪辛基伯胺(OA)在水溶液中原位形成动态亚胺键型表面活性剂FPSA-OA(C_(8)H_(17)N=CH-C_(6)H_(4)OCH_(2)CH_(2)N^(+)(CH_3)_2CH_(2)CH_(2)CH_(2)SO_(3)^(–))。通过表面张力(γ)曲线得到25℃时FPSA-OA的临界胶束浓度(cmc)为3.43×10^(-3)mol/L,γcmc为30.89 m N/m;此外,FPSAOA可以将石油醚-水的界面张力降低至4.87 m N/m,表现出良好的表(界)面活性。结果表明,FPSA-OA具有pH响应性,其p H开关窗口为8~12;对于2×10^(-3)mol/L FPSA-OA溶液而言,当pH分别在8和12可逆变化时,其γ在70和37 m N/m之间相应可逆改变;如此循环5次,FPSA-OA水溶液的表面张力均表现出良好的响应可逆性。展开更多
基金supported by a key project of the National Natural Science Foundation of China(No 21938003)the Postdoctoral Foundation of the PetroChina Dagang Oilfield Company(No.2023BO59).
文摘Surfactants are extensively employed in the cold production of heavy oil.However,producing heavy oil emulsions using conventional surfactants poses a challenge to spontaneous demulsification,necessitating the addition of demulsifiers for oil-water separation.This inevitably increases the exploitation cost and environmental pollution risk.Switchable surfactants have garnered much attention due to their dual capabilities of underground heavy oil emulsification and surface demulsification.This study focuses on the fundamental working principles and classification of novel switchable surfactants for oil displacement developed in recent years.It offers a comprehensive overview of the latest advances in the applications of switchable surfactants in the fields of enhanced oil recovery(EOR),oil sand washing,and oil-water separation.Furthermore,it highlights the existing challenges and future development directions of switchable surfactants for heavy oil recovery.
基金supported by the Natural Sciences and Engineering Research Council of Canada (NSERC)the Canada Research Chairs Program (Hongbo Zeng)the China Scholarship Council (CSC) (An Chen)
文摘This article reports the development of a novel switchable Pickering emulsion with rapid CO_(2)/N_(2) respon-siveness,which is stabilized using alumina nanoparticles hydrophobized in situ with a trace amount of a switchable superamphiphile via electrostatic interactions.With the introduction of CO_(2) for 30 s,the Pickering emulsion can be spontaneously demulsified with complete phase separation;the emulsion can then be reconstructed in response to N_(2) purging for 10 min followed by homogenization.Moreover,the stable Pickering emulsion can be stored for more than 60 days at room temperature with-out any visible change.The CO_(2)/N_(2)-responsive behavior of the switchable Pickering emulsion is attribu-ted to the reversible desorption/adsorption of the switchable surfactants on the surfaces of the alumina nanoparticles upon the alternative bubbling of CO_(2)or N_(2).Thanks to the simple fabrication of the surfac-tant and the hydrophobization of the alumina nanoparticles,this research has developed an extremely facile and cost-efficient method for preparing a rapidly CO_(2)/N_(2)-responsive switchable Pickering emul-sion.The dosage of the switchable surfactants has been significantly reduced by nearly 1500 times(from 150 to 0.1 mmol·L^(-1))as compared with the dosage used in previous studies.Moreover,the as-prepared CO_(2)/N_(2)-responsive switchable Pickering emulsion is environmentally friendly,mild,and nontoxic;thus,it holds great potential for practical applications with considerable economic and environmental benefits,such as oil transport,fossil fuel production,environmental gases detection,and the encapsulation and release of active ingredients.
文摘基于动态亚胺键特殊的pH响应特性,构筑具有pH可逆响应的表面活性剂及其自组装体系是近年来表面活性剂物理化学领域的热点之一,但是两性离子型的动态亚胺键表面活性剂尚未见报导。为此,设计并合成一种带有磺基甜菜碱亲水基的芳香醛(FPSA,(CHO)C_(6)H_(4)OCH_(2)CH_(2)N^(+)(CH_3)_(2)CH_(2)CH_(2)CH_(2)SO_(3)^(-))的前驱体,并与脂肪辛基伯胺(OA)在水溶液中原位形成动态亚胺键型表面活性剂FPSA-OA(C_(8)H_(17)N=CH-C_(6)H_(4)OCH_(2)CH_(2)N^(+)(CH_3)_2CH_(2)CH_(2)CH_(2)SO_(3)^(–))。通过表面张力(γ)曲线得到25℃时FPSA-OA的临界胶束浓度(cmc)为3.43×10^(-3)mol/L,γcmc为30.89 m N/m;此外,FPSAOA可以将石油醚-水的界面张力降低至4.87 m N/m,表现出良好的表(界)面活性。结果表明,FPSA-OA具有pH响应性,其p H开关窗口为8~12;对于2×10^(-3)mol/L FPSA-OA溶液而言,当pH分别在8和12可逆变化时,其γ在70和37 m N/m之间相应可逆改变;如此循环5次,FPSA-OA水溶液的表面张力均表现出良好的响应可逆性。
