Artigo Revisado por pares

Evolution of a method for quantitative supercritical fluid extraction of Ethanox 330 antioxidant from high-density polyethylene

1998; Elsevier BV; Volume: 811; Issue: 1-2 Linguagem: Inglês

10.1016/s0021-9673(98)00263-5

ISSN

1873-3778

Autores

A. M. P. Pinto, Larry T. Taylor,

Tópico(s)

Ionic liquids properties and applications

Resumo

Supercritical fluid extraction (SFE) was employed prior to the HPLC assay of the additive Ethanox® 330 from high-density polyethylene (HDPE). The effects of temperature, various modifiers and modifier concentration were investigated. The use of extraction temperatures above 95°C for the additive-containing polymer resulted in less than quantitative recovery and the appearance of a degradate peak in the extract chromatogram. A 70-min extraction was found to be optimum for HDPE when using greater than 10% methylene chloride- or methanol-modified CO2. After discovering the optimal extraction temperature, we found that rinsing the octadecylsilica solid-phase trap with methylene chloride rather than methanol improved the recovery efficiency. Recoveries of greater than 90% can be achieved in all cases when the primary antioxidant, Ethanox 330, appears in the presence of secondary antioxidants.

Referência(s)
Altmetric
PlumX