Determination of Cloud Points of Poly (propylene glycol) Aqueous Mixtures Using Particle Counting Method
Advancing the chemical engineering fundamentals
Thermodynamics (T2-1P)
Keywords: Cloud Point, Particle Counter, Aqueous Polymer Solutions, Partial Miscibility
Determination of Cloud Points of Poly (propylene glycol) Aqueous Mixtures Using Particle Counting Method
A. Eliassi1*, A. Parach1
1 Chemical Industries Research Department, Iranian Research Organization for Science and Technology (IROST), No. 71, Forsat Street, Enghelab Ave.,Tehran,Iran
Abstract
Cloud points of aqueous poly (propylene glycol) (PPG) mixtures at various concentration of PPG are determined using particle counting method. The number average molecular weight of the PPG is 425 and its concentrations are changed from 0.5 up to 5 weight percents. In this method, initially an aqueous solution of PPG with a specified concentration at a specified temperature is made. At this condition, the number of particles in the solution is measured by a particle counter apparatus. Then by slowly increasing of the solution temperature, the number of particles is measured. The temperature at which a sudden increase in the number of particles is observed is noted as the cloud point. The increase of the particles is due to the formation of new liquid phase in the mixture. This procedure is repeated for various PPG concentration mixtures. We could determine the cloud point curve of the aqueous PPG mixture with an easy and rapid and precision method.
Key Words: Cloud Point, Particle Counter, Aqueous Polymer Solutions, Partial Miscibility
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* Corresponding Author e-mail: alieliassi@yahoo.com
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Presented Monday 17, 13:30 to 15:00, in session Thermodynamics (T2-1P).
