Alcohols prepared by the ‘‘oxo’’ process are slightly branched and always con- tain a portion of secondary alcohols. Because they are secondary alcohols, they are not as easily sulfated as the primary isomers, and since they contain both even and odd chain lengths, the physical properties of the resulting surfactants may differ somewhat from those of the natural and Ziegler process alcohols.In addition to more varied alcohol sources, product quality is improved by the use of gas-phase SO3 as the sulfating agent instead of the more harsh chlorosulfonic and sulfuric acids. As a result, the surfactants generally have a lighter color and less sodium sulfate as a contaminant.
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