Abstract
Viscosity prediction of carbonaceous solid-water slurries is essential to process design and control. Existing viscosity models take into account particle-size distributions but fail to account for the surface chemistry of the solids. Surface chemistry affects inter-particle and particle-water interactions and therefore influences slurry viscosity of concentrated suspensions. On the basis of surface chemistries characterized by contact angle and zeta potential measurements, this study determines the inter-particle interaction energies. Polar interaction energy, observed to be 2-3 orders of magnitude greater than the electrostatic interaction energy and the van der Waal interaction energy, is clearly the dominant interaction energy for such a system. Both hydrophobic and hydrophilic interactions of these particles in water result in microstructures which trap water either in the form of coalescing droplets in aggregation networks or in the form of hydration layers around carbonaceous solids, leading to an increase in the effective solid volume fraction and thus increase in slurry viscosity. The increase in effective solid volume fraction is dependent on the surface chemistry of the solid and thus is specific to a carbonaceous solid. The factor by which solid volume fraction increases for a particular carbonaceous solid was determined using viscosity measurements and Krieger-Dougherty equation and was found to correlate very well with the oxygen to carbon ratio of the solid. Incorporating this factor in the Krieger-Dougherty equation resulted in accurate prediction of slurry viscosity. This modified model was successfully validated using three other concentrated carbonaceous solid-water slurries.
| Original language | English (US) |
|---|---|
| Title of host publication | Manufacturing for the 21st Century 2015 - Topical Conference at the 2015 AIChE Spring Meeting and 11th Global Congress on Process Safety |
| Publisher | AIChE |
| Pages | 106-118 |
| Number of pages | 13 |
| ISBN (Electronic) | 9781510806917 |
| State | Published - Jan 1 2015 |
| Event | Manufacturing for the 21st Century 2015 - Topical Conference at the 2015 AIChE Spring Meeting and 11th Global Congress on Process Safety - Austin, United States Duration: Apr 26 2015 → Apr 30 2015 |
Publication series
| Name | Manufacturing for the 21st Century 2015 - Topical Conference at the 2015 AIChE Spring Meeting and 11th Global Congress on Process Safety |
|---|
Other
| Other | Manufacturing for the 21st Century 2015 - Topical Conference at the 2015 AIChE Spring Meeting and 11th Global Congress on Process Safety |
|---|---|
| Country | United States |
| City | Austin |
| Period | 4/26/15 → 4/30/15 |
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All Science Journal Classification (ASJC) codes
- Engineering(all)
Cite this
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Role of surface chemistry in predicting viscosity of concentrated carbonaceous solid-water slurries. / Mukherjee, Amrita; Pisupati, Sarma V.
Manufacturing for the 21st Century 2015 - Topical Conference at the 2015 AIChE Spring Meeting and 11th Global Congress on Process Safety. AIChE, 2015. p. 106-118 (Manufacturing for the 21st Century 2015 - Topical Conference at the 2015 AIChE Spring Meeting and 11th Global Congress on Process Safety).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
TY - GEN
T1 - Role of surface chemistry in predicting viscosity of concentrated carbonaceous solid-water slurries
AU - Mukherjee, Amrita
AU - Pisupati, Sarma V.
PY - 2015/1/1
Y1 - 2015/1/1
N2 - Viscosity prediction of carbonaceous solid-water slurries is essential to process design and control. Existing viscosity models take into account particle-size distributions but fail to account for the surface chemistry of the solids. Surface chemistry affects inter-particle and particle-water interactions and therefore influences slurry viscosity of concentrated suspensions. On the basis of surface chemistries characterized by contact angle and zeta potential measurements, this study determines the inter-particle interaction energies. Polar interaction energy, observed to be 2-3 orders of magnitude greater than the electrostatic interaction energy and the van der Waal interaction energy, is clearly the dominant interaction energy for such a system. Both hydrophobic and hydrophilic interactions of these particles in water result in microstructures which trap water either in the form of coalescing droplets in aggregation networks or in the form of hydration layers around carbonaceous solids, leading to an increase in the effective solid volume fraction and thus increase in slurry viscosity. The increase in effective solid volume fraction is dependent on the surface chemistry of the solid and thus is specific to a carbonaceous solid. The factor by which solid volume fraction increases for a particular carbonaceous solid was determined using viscosity measurements and Krieger-Dougherty equation and was found to correlate very well with the oxygen to carbon ratio of the solid. Incorporating this factor in the Krieger-Dougherty equation resulted in accurate prediction of slurry viscosity. This modified model was successfully validated using three other concentrated carbonaceous solid-water slurries.
AB - Viscosity prediction of carbonaceous solid-water slurries is essential to process design and control. Existing viscosity models take into account particle-size distributions but fail to account for the surface chemistry of the solids. Surface chemistry affects inter-particle and particle-water interactions and therefore influences slurry viscosity of concentrated suspensions. On the basis of surface chemistries characterized by contact angle and zeta potential measurements, this study determines the inter-particle interaction energies. Polar interaction energy, observed to be 2-3 orders of magnitude greater than the electrostatic interaction energy and the van der Waal interaction energy, is clearly the dominant interaction energy for such a system. Both hydrophobic and hydrophilic interactions of these particles in water result in microstructures which trap water either in the form of coalescing droplets in aggregation networks or in the form of hydration layers around carbonaceous solids, leading to an increase in the effective solid volume fraction and thus increase in slurry viscosity. The increase in effective solid volume fraction is dependent on the surface chemistry of the solid and thus is specific to a carbonaceous solid. The factor by which solid volume fraction increases for a particular carbonaceous solid was determined using viscosity measurements and Krieger-Dougherty equation and was found to correlate very well with the oxygen to carbon ratio of the solid. Incorporating this factor in the Krieger-Dougherty equation resulted in accurate prediction of slurry viscosity. This modified model was successfully validated using three other concentrated carbonaceous solid-water slurries.
UR - http://www.scopus.com/inward/record.url?scp=84961956302&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84961956302&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84961956302
T3 - Manufacturing for the 21st Century 2015 - Topical Conference at the 2015 AIChE Spring Meeting and 11th Global Congress on Process Safety
SP - 106
EP - 118
BT - Manufacturing for the 21st Century 2015 - Topical Conference at the 2015 AIChE Spring Meeting and 11th Global Congress on Process Safety
PB - AIChE
ER -