Viscosities of aqueous ethylene glycol

Table 7.139 Viscosities of Aqueous Ethylene Glycol Solutions (23)... 

Figure 5.3A Viscosities of aqueous ethylene glycol solutions. (Courtesy of John M. Campbell.)...

Fig. 9. Arrhenius plots of the logarithmic, , rate of carbon monoxide binding to microperoxidase and of log T/r) (r = viscosity) against inverse temperature, T", - - -(a) Aqueous glycerol (79 wt. %) (b) aqueous ethylene glycol (75.1 wt.%) and (c) polyethylene glycol (39.6 wt.%). The temperature dependence of the activation process, feacti was deduced by fitting the observed rate coefficients to an...

Table 7.69 Absolute Viscosity of Aqueous Solutions of Ethylene Glycol, levo-2,3-Butanedlol, meso-dextro-...

SAR Saravanan, S., Reena, J.A., Rao, J.R., Murugesan, T., and Nair, B.U., Phase equilibrium compositions, densities, and viscosities of aqueous two-phase poly(ethylene glycol) + poly(actylic acid) system at various temperatures, J. Chem. Eng. Data, 51, 1246, 2006. 

Figure 2.3 Effect of viscosity on rate constant in solution (3). Experimental plots of observed against r or rj/r for (a) binding of CO to the haem group in ferrous microperoxidases (MP) in aqueous ethylene glycol (b) binding of HCO to carbonic anhydrase in aqueous glycerol.

Viscosity. The reaction between ferroprotoporphyrin IX and carbon monoxide is diffusion controlled in glycerol, but is under normal chemical activation control in aqueous ethylene glycol, as mentioned in the previous Volume of this Report. The balance between the two modes of control of activation has now been investigated for a range of glycerol-water mixtures over a range of temperatures, in other words... 

Kalaivani S, Srikanth CK, Regupathi I (2012) Densities and viscosities of binary and ternary mixtures and aqueous two-phase system of ply(ethylene glycol) 2000 + diammonium hydrogen citrate + water at different temperatures. J Chem Eng Data 57 2528-2534 Kumar H, Kaur K, Kaur SP, Singla M (2013) Studies of volumetric and acoustic properties of trisodium citrate and tripotassium citrate in aqueous solutions ofN-acetyl glyeine at different temperatures. J Chem Thermodyn 59 173-181... 

Aqueous solutions can be stabilized against viscosity loss by addition of 5—10 wt % anhydrous isopropyl alcohol, ethanol, ethylene glycol, or propylene glycol. The manganous ion (Mn " ) also is an effective stabilizer at concentrations of 10 -10 wt% of the solution. 

The resultant yellow sodium cellulose xanthate is dispersed in an aqueous caustic soda solution, where some hydrolysis occurs. This process is referred to as ripening and the solution as viscose . When the hydrolysis has proceeded sufficiently the solution it transferred to a hopper from which it emerges through a small slit on to a roller immersed in a tank of 10-15% sulphuric acid and 10-20% sodium sulphate at 35-40°C. The viscose is coagulated and by completion of the hydrolysis the cellulose is regenerated. The foil is subsequently washed, bleached, plasticised with ethylene glycol or glycerol and then dried. 

In the case of ionic liquids, these general aspects for all fluid-fluid reactions are of particular importance, since mass transfer into an ionic liquid layer is generally slower than into an organic or aqueous medium. This is because ionic liquids usually have much higher viscosities than organic solvents. The least viscous ionic liquids are somewhat similar to ethylene glycol as demonstrated in Table 7.2. However, many ionic liquids used in liquid-liquid biphasic catalysis are significantly more viscous. 

Experiments are performed in a 0.395 m high and 23 mm internal diameter stainless steel reactor, packed with various particles (Table 1). a is measured via C02 fast absorption into 1.5 kmol/m3 DEA aqueous solutions of varying viscosity through addition of ethylene-glycol (ETG). k,a is measured via C02 slow absorption into 0.05 kmol/m3 DEA in ETG. All the experiments are carried out at 298 K. The gas mixture is obtained by mixing 5% vol. COz in pure N2. C02 conversion is determined by gas phase chromatography analysis. Physicochemical properties of the liquids tested are shown in Table 1. 

Table 7.2 shows the viscosity, mutual diffusion coefficient, and thermodynamic factor for aqueous solutions of ethylene glycol and polyethylene glycol (PEG) at 25°C the diffusivity decreases considerably with increasing molecular weight, while the viscosity increases. Table 7.2 shows the thermal diffusion ratios for liquids and gases at low density and pressure the thermal diffusion ratios are relatively larger in liquids. 

Table 7.2a. Viscosities, mutual diffusion coefficients, and thermodynamic factors for aqueous solutions of ethylene glycol and PEG at 25°Ca...

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