A method for measuring the metastable region of a microporous membrane-responsive high-concentration and low-transmittance solution system
A measurement method and high-concentration technology, applied in the direction of weighing by removing certain components, material resistance, etc., can solve the problem of inability to measure the crystallization metastable region of low-transmittance systems, inability to accurately respond to crystal nucleus formation, and measurement accuracy No high-level problems, to achieve the effect of improving data measurement accuracy, precision, high adjustability of operation time, and high test accuracy
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Embodiment 1
[0032] Dissolve 36.8g of NaCl crystal (analytical pure) in 100g of water to form NaCl aqueous solution, which is used as the solution to be tested, and keep the temperature at 70°C for 30min. Turn on the circulation pump to circulate the NaCl aqueous solution in the crystallization tank and the hollow fiber membrane module filled with PTFE. Adjust the flow rate of the circulating pump to control the flow rate of the NaCl aqueous solution in the tube to 0.10m / s. Then, the cooling circulating water on the permeation side of the membrane module is turned on, the water temperature is kept at 30°C, and the flow rate of the cooling circulating water in the pipe is 0.10m / s. Keep the temperature in the crystallization tank, stirring, and the flow rate of the circulation pump stable, and start the measurement process; use a precision electronic balance to weigh the total mass of the solvent in the solvent storage tank and the solvent storage tank, and record the weighing data in real t...
Embodiment 2
[0034] 243.7gCoSO 4 ·7H 2 O crystals (analytically pure) were dissolved in 315.85 g of water to form CoSO 4 The aqueous solution, as the solution to be tested, was kept at 60°C for 30 minutes. Turn on the circulation pump to make the CoSO 4 The aqueous solution circulates in the crystallization tank and the hollow fiber membrane module filled with PVDF. Adjust the circulation pump flow rate to control the flow rate of the solution to be tested in the tube to 0.2m / s. Then, turn on the vacuum pump connected to the other side of the membrane module, adjust the vacuum degree to stabilize to -0.09MPa, then open the vacuum valve and cold trap to generate a pressure difference on both sides of the microporous membrane, and maintain the temperature, stirring, and circulation pump flow rate in the crystallization tank Stable, start the measurement process; use a precision electronic balance to weigh the condensate of the steam that permeates the membrane in the cold trap, record th...
Embodiment 3
[0037] At 71°C, different concentrations (mass fractions) of KNO were prepared 3 aqueous solution, and use a conductivity meter to measure the different concentrations (mass fraction) of KNO prepared at 71°C 3 For the conductivity of aqueous solution, use empirical formulas (experiential formulas such as exponential type and polynomial type can be used, and the formula with the most ideal fitting result shall prevail) to measure KNO at different concentrations (mass fractions) at 71°C. 3 The concentration and conductivity data of the aqueous solution are fitted into a line to obtain the calibrated KNO 3 The conductivity of aqueous solution varies with KNO 3 The relationship between the concentration change of the aqueous solution.
[0038] 264.39g KNO 3 Crystals (analytically pure) were dissolved in 193.45 g of water to form KNO 3 The aqueous solution, as the solution to be tested, was kept at 71°C for 30 minutes. Turn on the circulating pump to make KNO 3 The aqueous so...
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