High‐temperature stability of alcohol ethoxylates

Journal of the American Oil Chemists' Society - 1995
Sam Evetts1, Cynthia Kovalski1, M.E. Levin1, M. Stafford1
1Shell Development Company, Westhollow Technology Center, Box 1380, Houston, TX, 77251-1380

Tóm tắt

AbstractThe oxidative stability of alcohol ethoxylates during storage and handling is studied. Realistic conditions are modelled by heating in quiescent air. More rigorous, extensively aerated conditions are modelled by thermogravimetry with mass spectrometric detection and differential scanning calorimetry with vapor‐phase sampling.In quiescent air, C12–15 alcohol with an average of 7 moles ethylene oxide (EO) is discolored at 204°C, with some increase in aldehydes, but there is no change in the EO distribution of the sample. Under extensively aerated conditions, increased oxidation occurs above 150°C, with a loss of one EO unit on average, and increases in CO and CO2 occur in the vapor phase above the sample. High‐temperature oxidation under extensive aeration is not affected by an antioxidant or by raising the pH of the sample from 6.4 to 7.5.

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Tài liệu tham khảo

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Journal of the American Oil Chemists' Society

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