US EPA

1540461 

Journal Article 

Density and Viscosity of Aqueous (Piperazine plus Carbon Dioxide) Solutions 

Freeman, SA; Rochelle, GT 

2011 

Yes 

Journal of Chemical and Engineering Data
ISSN: 0021-9568
EISSN: 1520-5134 

56 

3 

574-581 

10.1021/je1012263 

WOS:000288113000031 

The density (rho) and viscosity (mu) of aqueous (piperazine
(PZ) + carbon dioxide (CO(2))) solutions were measured over a temperature range of (293.15 to
333.15) K and concentration ranges of (1.5 to 7.0) mol.kg(-1) PZ ((2 to 20) molal (m) PZ) and (0
to 4.0) mol.kg(-1) CO(2). Data for density and viscosity are presented in tabular form and
include units useful for CO(2) capture applications (CO(2) loading and PZ concentration in m).
Density data are analyzed as the ratio of rho to the density of water to eliminate the effect of
temperature. On this basis, rho for (5 to 12) m PZ ((3.2 to 5.0) mol.kg(-1) PZ) was correlated
with a linear regression as a function of CO(2) and PZ concentrations to within 0.78% for all
data. A prediction of rho up to 20 m PZ induces an error of only 1.5 %. Viscosity data are
analyzed in a similar way, and a regression for 8 m PZ (4.1 mol.kg(-1) PZ) viscosity fit all
experimental data within 6.0 %. The applicability of these regressions to online monitoring of a
PZ based CO(2) capture application is discussed.