Research Initiation: Direct Viscosity Enhancement of Dense Carbon Dioxide

这项研究的主要目的是诱导一个 液体二氧化碳的粘度显著增加， 溶解少量可能聚集在 流体相并形成长的大分子状结构。 三 将使用一种新的，高压， 视觉落筒粘度计和高压PVT装置。 将使用各种油溶性非离子和半氟化表面活性剂。 溶解在二氧化碳中，沿着少量的水， 试图形成长的圆柱形反胶束和微乳液。 半氟化烷烃构成第二类候选物 化合物. 最后，将氟化三正丁基锡和共溶剂混合。 引入液态二氧化碳中。 增加二氧化碳的粘度可能在以下方面有价值： 开发低电流油藏的驱替介质 粘性二氧化碳溶液导致旁通或窜流 和低回收效率。 对表面活性剂的理解 在超临界流体中的行为也可导致新的分离， 结合表面活性剂技术和 超临界流体技术

The primary objective of this proposed research is to induce a significant increase in the viscosity of liquid carbon dioxide by dissolving small amounts of chemical compounds which may aggregate in the fluid phase and form long macromolecule-like structures. Three types of compounds will be evaluated using a novel, high pressure, visual falling cylinder viscometer and a high pressure PVT apparatus. Various oil soluble nonionic and semi-fluorinated surfactants will be dissolved in carbon dioxide along with small amounts of water, in an attempt to form long, cylindrical reverse micelles and microemulsions. Semi-fluorinated alkanes constitute the second category of candidate compounds. Finally, tri-n-butyltin fluoride and a cosolvent will be introduced into the liquid carbon dioxide. Increasing the viscosity of carbon dioxide may be of value in developing displacement media in oil reservoirs where current low viscosity carbon dioxide solutions lead to by-passing or channeling and low recovery efficiencies. An understanding of surfactant behavior in supercritical fluids may also lead to new separation and purification processes combining surfactant technology and supercritical fluid technology.