TY - JOUR
T1 - Understanding and predicting the solubility of bio-crude oils
AU - Pedersen, Thomas Helmer
AU - Sharma, Kamaldeep
AU - Rosendahl, Lasse
PY - 2020/7
Y1 - 2020/7
N2 - The solubility behavior of three renewable bio-liquids obtained from hydrothermal liquefaction, rapeseed oil, and two common refinery streams is investigated. 242 solubility tests are performed, which lay the foundation for testing three different solubility approaches, namely: Hildebrand, Wiehe, and Hansen solubility parameters, and gaining a better understanding of the blending capabilities of bio-liquids into refinery streams. Finally, a theoretical investigation of common bio-liquid model compounds is undertaken. Results show that the Hildebrand solubility parameter is inadequate in predicting the solubility behavior of bio-liquids and should not be pursued in trying to derive a method for predicting compatible matches of complex liquids. The two-dimensional Wiehe solubility parameters are accurate in predicting pure solvents and nonsolvents for such complex liquids. However, the Wiehe approach is incapable of predicting the mutual compatibillity of bio-liquids, too. The Hansen solubility parameters show a compatibility wall defined by a distance calculated in the Hansen space. Although an overlapping region exists, it is expected that further experiments can help defining a threshold value below which compatible matches can be found. A conservative estimate is that any binary mixture of complex liquids chemically comparable to those under investigation, having a mutual distance below 4.9 in the Hansen space, are compatible.
AB - The solubility behavior of three renewable bio-liquids obtained from hydrothermal liquefaction, rapeseed oil, and two common refinery streams is investigated. 242 solubility tests are performed, which lay the foundation for testing three different solubility approaches, namely: Hildebrand, Wiehe, and Hansen solubility parameters, and gaining a better understanding of the blending capabilities of bio-liquids into refinery streams. Finally, a theoretical investigation of common bio-liquid model compounds is undertaken. Results show that the Hildebrand solubility parameter is inadequate in predicting the solubility behavior of bio-liquids and should not be pursued in trying to derive a method for predicting compatible matches of complex liquids. The two-dimensional Wiehe solubility parameters are accurate in predicting pure solvents and nonsolvents for such complex liquids. However, the Wiehe approach is incapable of predicting the mutual compatibillity of bio-liquids, too. The Hansen solubility parameters show a compatibility wall defined by a distance calculated in the Hansen space. Although an overlapping region exists, it is expected that further experiments can help defining a threshold value below which compatible matches can be found. A conservative estimate is that any binary mixture of complex liquids chemically comparable to those under investigation, having a mutual distance below 4.9 in the Hansen space, are compatible.
KW - Biofuels
KW - Blending
KW - Compatibility
KW - Hydrothermal liquefaction
UR - http://www.scopus.com/inward/record.url?scp=85082023806&partnerID=8YFLogxK
U2 - 10.1016/j.fuel.2020.117619
DO - 10.1016/j.fuel.2020.117619
M3 - Journal article
SN - 0016-2361
VL - 271
JO - Fuel
JF - Fuel
M1 - 117619
ER -