Multivariate optimization of pressurized solvent extraction of alkylphenols and alkylphenol ethoxylates from biosolids

Journal of the Brazilian Chemical Society

Ahumada, Inés¹  Richter, Pablo¹  Maricán, Adolfo¹  Universidad de Chile, Chile¹ 

关键词: pressurized solvent extraction;    biosolid;    alkylphenols;    alkylphenol ethoxylates;   

DOI  :  10.1590/S0103-50532012000200011

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

In this study, a methodology for pressurized solvent extraction of alkylphenols (APs) and alkylphenol ethoxylates (APEOs) from biosolids was optimized by utilizing a biosolid natively containing these compounds at a high concentration level. Optimization of the extraction was carried out through a multivariate analysis experimental design with a central composite design (CCD) producing the following optimum values for the variables: temperature of 129 ºC, extraction time per cycle of 34 min in two cycles and acetone as extraction solvent. Upon comparison with Soxhlet extraction, this methodology turned out to be more efficient for the extraction of APEOs and of similar efficiency for APs. On the other hand, the methodology is considerably faster than Soxhlet and uses a smaller amount of extraction solvent. Concentrations of 204 ± 20 and 1053 ± 23 mg kg-1 for nonylphenol and nonylphenol-ethoxylate, respectively, were determined in the biosolid sample assayed.

【 授权许可】

Unknown