Measurement and correlation of phase equilibria of ethylene + n-hexane + metallocene polyethylene at temperatures between 373 and 473 K and at pressures up to 20 MPa

Xiaoning Chen, Kazuaki Yasuda, Yoshiyuki Sato, Shigeki Takishima, Hirokatsu Masuoka

研究成果: Article査読

36 被引用数 (Scopus)

抄録

The purpose of this work was to measure phase equilibria of importance for producing industrial linear low-density polyethylene (LLDPE) using metallocene catalysis technology. Phase equilibria for n-hexane + polyethylene (PE) mixtures and for ethylene + n-hexane + PE mixtures were measured at temperatures from 373.2 to 473.2K and at pressures up to 20MPa. Nearly monodisperse PE15k, PE108k and their mixtures were used in the investigations to explore the effect of polymer molecular weight on the phase behavior. All the systems exhibited liquid-liquid equilibria with an upper critical solution pressure. The Sanchez-Lacombe equation of state is used to correlate the phase behavior of these systems and the effect of adding supercritical ethylene. The Hosemann-Schramek function was found to provide a suitable description of the molecular weight distribution used in some of the calculations. The cloud point pressure of ethylene + n-hexane + PE was found to increase proportionally with the weight fraction of supercritical ethylene.

本文言語English
ページ(範囲)105-115
ページ数11
ジャーナルFluid Phase Equilibria
215
1
DOI
出版ステータスPublished - 2004 1月 15
外部発表はい

ASJC Scopus subject areas

  • 化学工学(全般)
  • 物理学および天文学(全般)
  • 物理化学および理論化学

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