Igepal CO-710 on sand (6) and generally are of the Langmuir type. Asa result of more extensive study, it is concluded that the final increase in adsorption reported for this detergent is not valid and is a reflection of the large experimental error caused by the suspension of fine calcite particles identified in the sand sample.The effect of electrolyte concentration on the adsorption of these detergent series is similar to the effect on the critical micelle concentrations of the Igepals (7). The maxima in adsorption are not increased markedly, but they occur at much lower concentrations.High electrolyte concentrations decrease the hydrophilicity of these detergents. Therefore, for comparable results, detergents used in saline water should have a higher ethylene oxide content than those used in fresh water.These results indicate that the detergents could be used effectively in strongly saline water, as well as in fresh water.
run naphthas are routinely analyzed using this technique. A typical analysis is shown in Table II and is compared to the results of the conventional procedure. A comparison is also made with the results of the conventional method after correction for errors introduced by the depentanization. These errors include approximately 1.5% light ends that are habitually left in the depentanized fraction and approximately 3.5% Ce components that are often cut out of it. The corrections are based solely on the gas chromatographic analyses of the overhead and bottoms of the depentanizations. The analytical results of the new technique are in good agreement with those of the corrected conventional method, but differ significantly from the uncorrected one.The repeatability of the new method was determined to be 0.6% at the 95% confidence level and compares favorably to the 2.4% obtained for the conventional procedure. The analytical technique presented here is therefore more accurate and precise than the conventional mass spectrometric method of analysis. Furthermore, the lengthy depentanization procedure is no longer required and high pressure process streams may be analyzed at their sampling pressures.To date, the technique has been applied solely to lowolefinic stocks. It should also be applicable to olefinic streams.
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