Extraction and precipitation particle coating using supercritical CO2

Yulu Wang, Dongguang Wei, Rajesh Dave, Robert Pfeffer, Martial Sauceau, Jean Jacques Letourneau, Jacques Fages

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


A modified RESS process for particle coating with a solution of polymer in supercritical CO2 was studied in this research. This technique involves extracting the polymer with supercritical CO2, with or without a cosolvent in an extraction vessel, and then precipitating the polymer onto the surface of host particles in a second precipitation vessel by adjusting the pressure and temperature inside the precipitator to lower its solubility. The research was performed using a pilot-scale supercritical apparatus, glass beads as host particles and two different polymers as coating materials. Experiments showed that the coating of glass beads with polyvinyl chloride-co-vinyl acetate (PVCVA) and hydroxypropyl cellulose (HPC) was successfully achieved. Scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), energy dispersive X-ray mapping and thermogravimetric analysis (TGA) were used to characterize the coatings obtained. The results indicate that the process of particle coating with supercritical solution is a promising environmentally friendly, alternative coating method with little or no organic solvents required.

Original languageEnglish (US)
Pages (from-to)32-44
Number of pages13
JournalPowder Technology
Issue number1
StatePublished - Sep 3 2002

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering


  • Cosolvent
  • Particle coating
  • Polymer
  • RESS
  • Supercritical CO


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