Vapor–liquid equilibrium ratios for hexane at infinite dilution in ethylene+impact polypropylene copolymer and propylene+impact polypropylene copolymer

Satō, Yoshiyuki; Tsuboi, Akito; Sorakubo, Atsushi; Takishima, Shigeki; Masuoka, Hirokatsu; Ishikawa, Takeshi

doi:10.1016/s0378-3812(00)00319-8

Cited by 33 publications

(25 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This variable was chosen for three reasons: (i) diffusion of n-pentane in PS is concentration dependent, so the starting pressure and the end pressure do not correctly characterize the pressure-step, (ii) the use of activity enables better comparison of the individual experiments, and (iii) the activity was used by other authors studying the diffusion of n-pentane in PS. 41,55,67,68 The value of a mid is calculated as (18) where p st and p end are the pressures before and after the pressure-step, respectively, and p sat is the saturated vapor pressure at the relevant temperature. Figure 6 shows diffusion coefficients increasing with T and a mid in agreement with theoretical expectations and previous studies.…”

Section: Diffusion In Thin Polystyrenementioning

confidence: 99%

Experimental Study of Sorption and Diffusion of n-Pentane in Polystyrene

et al. 2013

View full text Add to dashboard Cite

Polystyrene (PS) foams are widespread heat insulation and impact absorption materials, but many blowing agents used in their production are harmful to the environment. Pentane is a less harmful alternative and is commonly used in the manufacturing of expandable PS, but there are inadequate diffusion data of pentane in PS available in the literature at conditions relevant to PS impregnation and foaming. We conducted gravimetric measurements of sorption dynamics of n-pentane in PS particles and thin films at temperatures from 45 to 110°C and pressures from 0 to 4.8 bar. The measured data were fitted using the Fick's and case II diffusion models and the obtained transport parameters are presented together with an analysis of the dominant diffusion mechanism. We also present the Flory−Huggins interaction parameter for the PS + n-pentane system and show that it can be used to accurately predict the sorption equilibria. This paper thus provides important parameters for the optimization of PS foam production.

show abstract

Section: Diffusion In Thin Polystyrenementioning

confidence: 99%

Experimental Study of Sorption and Diffusion of n-Pentane in Polystyrene

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Different thermodynamics models have been developed and tested for the validation and prediction of monomer solubility in polymers. Activity coefficient models (ACM) and equations of state (EOS) models are well established classes of thermodynamic models that have been used extensively for the prediction of equilibrium monomer solubility in polymers 1–13. However, there is no universal thermodynamic model for the prediction of monomer(s) solubility in polymers at commonly implemented process conditions.…”

Section: Introductionmentioning

confidence: 99%

“…These parameters are considered as an alternative to critical constants used by other EOS for light compounds24, 25 and, therefore, the precise estimation of these parameters is of high importance for the SL EOS predictions in monomer/polymer systems. In general, the pure component characteristic parameters used in SL EOS can be estimated by: i) regressing the PVT data of pure components,2, 8, 11, 20, 21, 26, 27 ii) using group contribution methods,24, 25 iii) using parameterization method28 and iv) using molecular dynamics simulations 1. Depending on the accuracy of these methods, different values for the characteristic parameters are obtained.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Pure Component Characteristic Parameters on Sanchez–Lacombe Equation‐of‐State Predictive Capabilities

Bashir

Ali

Kanellopoulos

et al. 2012

Macro Reaction Engineering

View full text Add to dashboard Cite

The dependence of predictive capabilities of SL EOS on the pure characteristic parameters of monomers and polymers is investigated. A sensitivity analysis study is carried out to understand the effect of these parameters on the predictive capability of SL EOS for different α‐olefin/polyolefins systems. Among all pure component characteristic parameters, the monomer characteristic temperature (T*monomer) has the largest impact on SL EOS predictive capability; whereas the polymer characteristic density (ρ*polymer) is found to have the smallest impact.

show abstract

“…First, two binary systems have to be studied in order to accurately determine the solubility of different propylene–hexane mixtures in PP at 343.2 K: Propylene–PP and hexane–PP. Our model was fitted to the experimental data from Sato et al The binary interaction parameters for each case are shown in Table .…”

Section: Methodsmentioning

confidence: 99%

A Study of the Gas Phase Polymerization of Propylene: The Impact of Catalyst Treatment, Injection Conditions and the Presence of Alkanes on Polymerization and Polymer Properties

Martins

Cancelas

McKenna

2016

Macro Reaction Engineering

View full text Add to dashboard Cite

Propylene is polymerized in the gas phase in a 2.5 L semibatch reactor using a commercially available supported Ziegler–Natta (ZN) catalyst. The mode of injection (wet vs dry), the impact of including a prepolymerization step, and of changing the composition of the gas phase are systematically investigated in terms of their influence on the instantaneous polymerization rate and polymer properties. Prepolymerization is observed to enhance the polymerization activity. This is attributed, at least in part, to the effect of prepolymerization step in decreasing local particle overheating in the initial instants of reaction. Furthermore, a noticeable decrease of the catalyst activity is observed when the catalyst is injected dry as compared to when is first wetted with paraffinic oil before being charged to the reactor. Adding a hydrocarbon to the catalyst can eventually reduce the risk of overheating during the critical initial instants of polymerization since it increases resistance of the diffusion of monomer to the active sites, acting as an “in situ” prepolymerization. Methods that increased the productivity also lead to an improvement of the powder morphology. Finally, it is found that adding vaporized iso‐hexane to the gas phase provokes an increase in the instantaneous polymerization rate, and increases the impact of hydrogen on the rate and molecular weight.

show abstract

Vapor–liquid equilibrium ratios for hexane at infinite dilution in ethylene+impact polypropylene copolymer and propylene+impact polypropylene copolymer

Cited by 33 publications

References 36 publications

Experimental Study of Sorption and Diffusion of n-Pentane in Polystyrene

Experimental Study of Sorption and Diffusion of n-Pentane in Polystyrene

The Effect of Pure Component Characteristic Parameters on Sanchez–Lacombe Equation‐of‐State Predictive Capabilities

A Study of the Gas Phase Polymerization of Propylene: The Impact of Catalyst Treatment, Injection Conditions and the Presence of Alkanes on Polymerization and Polymer Properties

Contact Info

Product

Resources

About