Removal of organic compounds from water via cloud-point extraction with permethyl hydroxypropyl-[beta]-cyclodextrin

Journal Article · Mon Mar 01 00:00:00 EST 1993 · Separation Science and Technology; (United States)

DOI:https://doi.org/10.1080/01496399308029234· OSTI ID:6718075

Warner-Schmid, D; Hoshi, Suwaru; Armstrong, D W ^[1]

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1. Univ. of Missouri, Rolla (United States)

Aqueous solutions of nonionic surfactants are known to undergo phase separations at elevated temperatures. This phenomenon is known as clouding,' and the temperature at which it occurs is refereed to as the cloud point. Permethylhydroxypropyl-[beta]-cyclodextrin (PMHP-[beta]-CD) was synthesized and aqueous solutions containing it were found to undergo similar cloud-point behavior. Factors that affect the phase separation of PMHP-[beta]-CD were investigated. Subsequently, the cloud-point extractions of several aromatic compounds (i.e., acetanilide, aniline, 2,2[prime]-dihydroxybiphenyl, N-methylaniline, 2-naphthol, o-nitroaniline, m-nitroaniline, p-nitroaniline, nitrobenzene, o-nitrophenol, m-nitrophenol, p-nitrophenol, 4-phenazophenol, 3-phenylphenol, and 2-phenylbenzimidazole) from dilute aqueous solution were evaluated. Although the extraction efficiency of the compounds varied, most can be quantitatively extracted if sufficient PMHP-[beta]-CD is used. For those few compounds that are not extracted (e.g., o-nitroacetanilide), the cloud-point procedure may be an effective one-step isolation or purification method. 18 refs., 2 figs., 3 tabs.

• OSTI ID: 6718075
• Journal Information: Separation Science and Technology; (United States), Vol. 28:4; ISSN 0149-6395
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AROMATICS
EXTRACTION
ORGANIC COMPOUNDS
REMOVAL
WATER
PURIFICATION
ANILINE
AQUEOUS SOLUTIONS
DEXTRIN
NAPHTHOLS
NITRO COMPOUNDS
NITROBENZENE
PHENOLS
SEPARATION PROCESSES
SURFACTANTS
AMINES
CARBOHYDRATES
DISPERSIONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
MIXTURES
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
POLYSACCHARIDES
SACCHARIDES
SOLUTIONS
400105* - Separation Procedures