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

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)105-115
Number of pages11
JournalFluid Phase Equilibria
Volume215
Issue number1
DOIs
Publication statusPublished - 2004 Jan 15

Keywords

  • Data
  • Liquid-liquid equilibria
  • Polydispersity
  • Polymer
  • Sanchez-Lacombe equation of state
  • Supercritical ethylene

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of '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'. Together they form a unique fingerprint.

  • Cite this