Pressurised liquid-liquid extraction. An approach to the removal of inorganic non-metal species from used industrial oils.

Abstract:

:Modified pressurised hot water is used for the development of a high pressure liquid-liquid extraction method for the decontamination of used industrial oils from inorganic non-metal species (chlorine, fluorine and sulphur). The oils were subjected to dynamic extraction with water modified with 5% v/v HNO3 at 200 degrees C as extractant. Under these working conditions the analytes were transferred to the aqueous phase. Spontaneous separation of the two immiscible liquid phases (the used oil and extract) takes place in the collection flask after extraction. The treated and untreated oil samples were oxidised and the chloride, fluoride and sulphate thus formed were determined by ion-chromatography. The method was applied to four oil samples from different locations in Spain. A residence time of approximately =10 min provided oil samples from which 88.3%, 89.4% and 89.4% of chloride, fluoride and sulphate, respectively, have been removed with respect to the initial concentration of each analyte in the oil. The repeatability, expressed as relative standard deviation (RSD), was of 11.9%, 13.7% and 7.2% for Cl(-), F(-) and SO4(2-), respectively; whilst the within-laboratory reproducibility yielded RSDs of 6.2%, 7.9% and 6.2% for the same analytes. The proposed approach has proved to be efficient, simple, easily transferable to industrial scale, cheap, fast and environmentally friendly.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Morales-Muñoz S,Luque-García JL,Luque de Castro MD

doi

10.1016/j.chemosphere.2004.05.011

subject

Has Abstract

pub_date

2004-09-01 00:00:00

pages

943-7

issue

10

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(04)00390-X

journal_volume

56

pub_type

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