Isentropic Compressibility and Viscosity of Aqueous and Methanolic Calcium Chloride Solutions

Abstract

Speeds of sound and viscosities of aqueous and methanolic calcium chloride solutions were measured as functions of concentration [0.0040 e m/(mol‚kg -1 ) e 7.151 and 0.1903 e m/(mol‚kg -1 ) e 3.252 for aqueous and methanolic calcium chloride solutions, respectively] and temperature (273.15 e T/K e 323.15). Isentropic compressibility isotherms of aqueous calcium chloride solutions converge at 5.1 mol‚kg -1 . In the case of methanolic calcium chloride solutions, isentropic compressibility isotherms vary smoothly with the increase in concentration and converge at 5.66 mol‚kg -1 on extrapolation. Total solvation numbers of calcium chloride in water and methanol media were estimated to be 10.9 and 5.5, respectively.

Aqueous Solutions of Calcium Ions: Hydration Numbers and the Effect of Temperature

“…20 The colligative property measurements used in this work showed that the same hydration number is valid for solutions at least up to 3.00 m in the same temperature range. The isentropic compressibility was, however, found to decline with increasing temperature, consistent with our findings of declining hydration number with increasing temperature.…”

(p,ρ,T) properties and apparent molar volumes Vϕ of CaCl2 in methanol at T=(298.15 to 398.15) K and pressure up to 40MPa

“…We compared our results with the results from Ref. [8] at T = 323.15 K, p = 0.1 MPa, m = 1.936 mol AE kg À1 and found Dq = +0.557% average deviation from our results. TABLE 2 Values of coefficients a ij , b ij , and c ij in equations (2) (1) to (4)).…”

“…[7] are higher than our results. The values of Wahab and Mahiuddin [8] were presented at T = (299.65 to 323.15) K, m = (0.1903 to 3.252) mol AE kg À1 intervals and in the ambient pressure. We compared our results with the results from Ref.…”

“…There are three publications [6][7][8] with density of these solutions in ambient pressure has been found. The (p, q, T) results at high pressures were not found in the literature.…”

Simulation of ammonia removal from industrial wastewater streams by means of a hollow-fiber membrane contactor

“…OE was carried out in a hollow fiber module (1.7 × 5.5 MiniModule Liquicel ® ), which has 7400 fibers with 0.5 µm pore diameter, 40 % porosity, and 0.58 m 2 area; Figure 6 shows the osmotic concentration system. Density [17] Fluids were driven using peristaltic pumps (concurrent), brine (CaCl 2 ) was maintained at a level of 44 % w/v (saturation point), with a 1:7 (L) feed/brine ratio. Juice temperature was controlled with a thermostatic bath (CW05G, Jeiotech, Korea) and a double jacket glass condenser, checking the temperature in real time with a thermocouple (J type, 800024, SperScientific, USA).…”