Article history: The abilities of three classes of low molecular weight, metal-based, associative compounds to thicken Received 8 January 2016 high pressure ethane, propane or butane have been assessed with a close clearance falling ball viscome- Received in revised form 15 March 2016 ter. Tributyltin ﬂuoride (TBTF) does not require a heating/cooling cycle to attain dissolution, and at a Accepted 17 March 2016 concentration of 1 wt% in ethane, propane or butane yields 70–100-fold viscosity increases at 25 C. Available online 26 March 2016 Increasing temperature substantially reduces TBTF’s thickening ability. Although hydroxyaluminum di- 2-ethylhexanoate (HAD2EH) is insoluble in ethane, it does dissolve in liquid propane or butane after Keywords: ◦ ◦ mixing at ∼100 C and cooling to temperatures as low as 40 C. HAD2EH induces small viscosity increases Ethane in propane, but is a very effective butane thickener. Increasing temperature causes a relatively small Propane decrease in HAD2EH’s thickening performance. Combining a phosphate ester and a crosslinker in ethane, Butane propane or butane yields a translucent liquid with viscosity increases that are signiﬁcantly less than those Small molecule thickener attained with TBTF or HAD2EH. Association Viscosity © 2016 Elsevier B.V. All rights reserved. 1. Introduction stranded ﬂuids
The Journal of Supercritical Fluids – Elsevier
Published: Aug 1, 2016
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