Quantification of the types of water in Eudragit RLPO polymer and the kinetics of water loss using FTIR

2013 ◽  
Vol 458 (1) ◽  
pp. 90-98 ◽  
Author(s):  
Chompak Pirayavaraporn ◽  
Thomas Rades ◽  
Keith C. Gordon ◽  
Ian G. Tucker
Keyword(s):  
Water Loss ◽  
Kinetics Of ◽  
Eudragit Rlpo

Thermal Dehydration Kinetic Mechanism of Aluminum Sulfate Hydrates

2010 ◽  
Vol 177 ◽  
pp. 238-244 ◽  
Author(s):  
Guang Hui Bai ◽  
Peng Xu ◽  
Peng Cheng Li ◽  
Tong Song Wang
Keyword(s):  
Water Loss ◽  
Aluminum Sulfate ◽  
Three Dimensional ◽  
Kinetic Mechanism ◽  
Thermal Dehydration ◽  
Temperature Range ◽  
Second Stage ◽  
Random Nucleation ◽  
Stage Process ◽  
Kinetics Of

Thermal dehydration kinetics of aluminum sulfate hydrates was studied with TG/DTA under static open air environment. It was found that the thermal dehydration of the aluminum sulfate hydrates was a two-stage process. The first stage happened in the temperature range from 90 to 300°C with 13 water loss. The second stage happened in the temperature range from 300 to 380 °C with 2 water loss. Activation energy and former factor of each staged were obtained by regression the TG/DTA data with 19 differential and integral functions based on non-isothermal Achar method as well as Coats-Redfern method. The result indicated that the mechanism for the first stage dehydration was the proliferation of three-dimensional, spherical symmetry, 3D, D3, slow-α-t curve, n = 2, reaction is reaction 2. The mechanism of the second stage dehydration was random nucleation and subsequent growth, A3, S-shaped α-t curve, n=1/3, m = 3, reaction is reaction 1/3. Identified that the most likely mechanism of Al2(SO4)3•15H2O dehydration is 2 and 1/3 reactions two process.

THE KINETICS OF REHYDRATION OF DETACHED SUNFLOWER LEAVES FOLLOWING SUBSTANTIAL WATER LOSS

1980 ◽  
Vol 84 (2) ◽  
pp. 293-306 ◽  
Author(s):  
P. CRUIZIAT ◽  
M. T. TYREE ◽  
C. BODET ◽  
M. A. LoGULLO
Keyword(s):  
Water Loss ◽  
Kinetics Of

Kinetics of water loss and the likelihood of intracellular freezing in mouse ova

1984 ◽  
Vol 6 (3) ◽  
pp. 197-213 ◽  
Author(s):  
Peter Mazur ◽  
W. F. Rall ◽  
S. P. Leibo
Keyword(s):  
Water Loss ◽  
Kinetics Of

scholarly journals Investigating the Nucleation Kinetics of Calcium Carbonate Using a Zero-Water-Loss Microfluidic Chip

2020 ◽  
Vol 20 (4) ◽  
pp. 2787-2795 ◽  
Author(s):  
Zongwei Zhang ◽  
Yuan Gao ◽  
Fiona C. Meldrum ◽  
Lingling Shui ◽  
Zhijun Wang ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Microfluidic Chip ◽  
Water Loss ◽  
Nucleation Kinetics ◽  
Kinetics Of

scholarly journals Modelling the kinetics of water loss during deep-fat frying of potato particulates

2014 ◽  
Vol 32 (No. 6) ◽  
pp. 585-594 ◽  
Author(s):  
P.-Y.H. Huang ◽  
Y.-Ch. Fu
Keyword(s):  
Water Loss ◽  
Structural Changes ◽  
Effect Of Temperature ◽  
Order Kinetic ◽  
Deep Fat Frying ◽  
First Order ◽  
Before And After ◽  
Order Kinetic Model ◽  
Rate Processes ◽  
Kinetics Of

We developed an empirical model to describe the water loss during deep-fat frying. Raw potato particulates were sliced to form cylinders and subjected to the deep-fat frying at isothermal temperatures of 160, 190, and 220&deg;C. The microstructure properties were assessed by Field Emission Scanning Electron Microscope (FESEM). The plot of the water content versus the frying time showed two distinct regions. A first-order kinetic model correlated with the two irreversible serial rate processes, rapid process and slow process, was hypothesised to describe the water loss during frying. The results showed the simultaneous two first-order kinetic models adequately predicted the water loss of potato particulates during isothermal frying. The effect of temperature on the rate constants, k<sub>1</sub> and k<sub>2</sub>, for the two processes was adequately modelled by the Arrhenius relationship. The observations of structural changes on the surface and in the inner section of potato particulates are critical. These physical pieces of evidence support our assumption that the mechanisms of the water loss (two-stage rate processes) before and after the transition time are different. &nbsp;

Kinetics of Solute Gain and Water Loss During Osmotic Dehydration of Orange Slices

2003 ◽  
Vol 9 (6) ◽  
pp. 389-396 ◽  
Author(s):  
M. Chafer ◽  
S. Perez ◽  
A. Chiralt
Keyword(s):  
Mass Transport ◽  
Transport Properties ◽  
Water Loss ◽  
Osmotic Dehydration ◽  
Solution Concentration ◽  
Process Yield ◽  
Sucrose Solutions ◽  
Osmotic Solution ◽  
Kinetics Of ◽  
Water And Solute Transport

The effect of the osmotic solution (sucrose and dextrose syrups) on the kinetics and process yield was evaluated on osmotic dehydration of orange (Valencia Late var.). Processes were carried out at 30 C, using 35, 45, 55 and 65 Brix solutions and by applying a vacuum pulse (100 mbar for 10 min) at the beginning of the process. Kinetics of sugar gain-water loss and mass changes were analysed by separately considering peel and pulp fractions of orange slices. Mass transport properties of orange slices in osmotic treatments were different for pulp and peel fractions due to the different contributions of the mechanisms involved. Faster water and solute transport were observed in the peel impregnated with the osmotic solution. Sugar gain in sucrose solutions was enhanced in comparison with dextrose treatments, whereas diffusional water loss was faster in samples treated with dextrose. These effects made the process yield higher for sucrose treatments. An increase in the osmotic solution concentration implied higher mass transport rates, but did not notably affect process yield.

Kinetic studies on the substitution reactions of (Pyridine-2-carbaldehyde 2'-pyridylhydrazone)nickel(II). A study of stacking interactions in outer-sphere complexes

1980 ◽  
Vol 33 (1) ◽  
pp. 45 ◽  
Author(s):  
RW Renfrew ◽  
P Osvath ◽  
DC Weatherburn
Keyword(s):  
Water Loss ◽  
Kinetic Studies ◽  
Outer Sphere ◽  
Ternary Complexes ◽  
Ring Closure ◽  
Stacking Interactions ◽  
Substitution Reactions ◽  
Loss Mechanism ◽  
Kinetics Of ◽  
Outer Sphere Complexes

Kinetics of the formation reactions of the mono and bis complexes of pyridine-2-carbaldehyde 2'-pyridylhydrazone (paphy) with nickel((II), the mono complex of 6-methylpyridine-2-carbaldehyde2'-pyridylhydrazone (mpaphy) with nickel(II), and of the ternary complexes of Ni(paphy)2+ with terpy, bpy, phen and pada and Ni(paphy)2+ and Ni(phen)2+ with mpaphy have been studied inaqueous solution at 25°C and ionic strength 0.1 mol dm-3 (NaNO3). The rates of the formationreactions of the mono complexes are slower than expected on the basis of the usual water-loss mechanism, and ring closure probably contributes to the observed rates. The formation of the bisand ternary complexes is usually more rapid than predicted by the water-loss mechanism. The enhanced rates are attributed to large outer-sphere association constants due to 'stacking' interactions between the incoming and bound ligands.

Sign in / Sign up

Export Citation Format

Share Document