Grasas y Aceites, Vol 60, No 4 (2009)

Oxidation of ethoxylated fatty alcohols to alkylpolyglycol carboxylic acids using noble metals as catalysts


https://doi.org/10.3989/gya.010309

Spiros Zlatanos
Chemical Engineering Department, Aristotle University of Thessaloniki, Greece

Kostas Laskaridis
Chemical Engineering Department, Aristotle University of Thessaloniki, Greece

Angelos Sagredos
Chemical Engineering Department, Aristotle University of Thessaloniki, Greece

Abstract


The conversion of ethoxylated fatty alcohols to the corresponding carboxylic acids through dehydrogenation/ oxidation using noble-metal catalysts has been studied. Ethoxylated primary aliphatic alcohols, ethoxylated random secondary aliphatic alcohols and ethoxylated alkylphenols have been converted to the corresponding acids in the presence of a base. The noble metal catalysts Palladium and Platinum were used without significant degradation of the ethoxyl chain in yields that exceeded 90%. On the other hand, the catalysts Rhodium and Ruthenium gave yields of about 80% and 60% respectively.

Keywords


Alkylpolyglycol carboxylic acid; Ethoxy carboxylic acid; Fatty alcohol ethoxylate; Noble-metal catalyst Oxidation; Noble-metal catalyst Dehydrogenation

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