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Narrow range ethoxylate
Fatty alcohol polyglycol ethers with a narrow homolog distribution, which are also known as narrow-range ethoxylates (NRE), are known nonionic surfactants which are industrially produced, for example, by addition of ethylene oxide onto fatty alcohols in the presence of suitable catalysts (layer compounds which have been calcined or hydrophobized with fatty acids) . This process can also be carried out on a variety of other hydrophobes and using different alkoxylating compounds (i.e propylene oxide, and butylene oxide) by modifying the catalyst properties.
Additional recommended knowledge
With conventional catalysts (i.e. potassium hydroxide, sodium hydroxide, etc.) one obtains a distribution of ethoxymers. If one targets a 12 mole ethoxylate with a conventional alkaline earth hydroxide , one could expect to get a broad range of ethoxylates with n being anywhere from 3 to 30 moles of EO. With narrow range catalysts a much tighter distribution can be obtained.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Narrow_range_ethoxylate". A list of authors is available in Wikipedia.|