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Calculation of phase equilibria for ethylene/low-density polyethylene mixtures

✍ Scribed by Stephen C. Harmony; David C. Bonner; Hubert R. Heichelheim


Publisher
American Institute of Chemical Engineers
Year
1977
Tongue
English
Weight
679 KB
Volume
23
Category
Article
ISSN
0001-1541

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✦ Synopsis


Abstract

We have used recent ethylene/low‐density polyethylene gas sorption data to calculate phase equilibria for ethylene/polyethylene mixtures from 0 to 30.3 MN/m^2^ (0 to 300 atm), the pressure range normally used in the flash separation step in low‐density polyethylene manufacture. The computations show significant differences from results obtained by extrapolation of the results of a previous study to the relatively low pressure range considered here.


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Sander model for correlation and prediction of salt effects on vapor-liquid equilibria (VLE) combines a Debye-Hiickel-type term with a modified UNIQUAC equation with concentration-dependent parameters. The Debye-Hiickel term has in this work been modified to ensure a more correct representation of t