Phase behavior of N-alkyl-2-pyrrolidones in aqueous and nonaqueous systems and the effect of additives

Anjing Lou, B. A. Pethica, P. Somasundaran, Xiang Yu

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

The phase behavior of N-cyclohexyl-2-pyrrolidone and a homologous series of N-alkyl-2-pyrrolidones mixed with water or with paraffins has been studied, and the effect of additives investigated. Depending upon the alkyl chain length, concentration, and temperature, the compounds can be either partially or completely miscible with water or paraffins. Several mixtures of the pyrrolidones and water show a lower consolute temperature (LCT). The LCTs can be changed to higher or lower temperatures by addition of salts, acids, and other compounds. Mixtures of the pyrrolidone compounds with paraffins, on the other hand, show an upper consolute temperature (UCT) behavior. The UCT decreases with the alkyl chain length of the pyrrolidones, but increases with the paraffin chain length. The miscibility of a given paraffin/pyrrolidone mixture can be improved by adding a longer chain pyrrolidone as third component.

Original languageEnglish (US)
Pages (from-to)190-193
Number of pages4
JournalJournal of Colloid And Interface Science
Volume256
Issue number1
DOIs
StatePublished - Jan 1 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Keywords

  • Lower/upper consolute temperature
  • N-alkyl-2-pyrrolidone
  • Phase separation

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