N-Hexadecanal

It is difficult to judge the accuracy of these methods because data are scarce. Table 4.9 compares the values obtained by different weighting methods with experimental values for a mixture of n-hexane-n-hexadecane at 25°C. The ASTM method shows results very close to those obtained experimentally. 

Comparison of weighting methods for liquid phase viscosities. Mixture of n-hexane - n-hexadecane at 298 K. 

Fig. XIV-4. Electrophoretic mobility of n-hexadecane drops versus the pH of the emulsion. (From Ref. 12.)...

The charge on a droplet surface produces a repulsive barrier to coalescence into the London-van der Waals primary attractive minimum (see Section VI-4). If the droplet size is appropriate, a secondary minimum exists outside the repulsive barrier as illustrated by DLVO calculations shown in Fig. XIV-6 (see also Refs. 36-38). Here the influence of pH on the repulsive barrier between n-hexadecane drops is shown in Fig. XIV-6a, while the secondary minimum is enlarged in Fig. XIV-6b [39]. The inset to the figures contains t,. the coalescence time. Emulsion particles may flocculate into the secondary minimum without further coalescence. 

Fig. XrV-6. (a) The total interaction energy determined from DLVO theory for n-hexadecane drops for a constant ionic strength - 5.0 nm) at various emulsion pH (b) enlargement of the secondary minimum region of (a). (From Ref. 39.)...

Boiron A-M, Lounis B and Orrit M 1996 Single molecules of dibenzanthanthrene in n-hexadecane J. Phys. Chem 105 3969-74... 

Fleury L, Tamarat P, Kozankiewicz B, Orrit M, Lapouyade R and Bernard J 1996 Single-molecule spectra of an impurity found in n-hexadecane and polyethylene Mol. Cryst. Liq. Cryst. 283 81-7... 

PETROLEUM - REFINERY PROCESSES, SURVEY] (Vol 18) Cetane [544-76-3], (See also n-Hexadecane.)... 

Kmw) is the distribution coefficient of the solute between methanol associated with water and n-hexadecane... 

This section deals with the experimental determination of the rate of oil solubilization in aqueous solutions of AOS and IOS [70]. The experimental method [71] consists of injecting 25 pi of n-hexadecane (containing 5 wt % Dobanol 45-3 as an emulsifier) into 50 ml water this produces a turbid macroemulsion upon vigorous stirring. At the start of the experiment, a concentrated solution of the surfactant under test is injected and the decrease in turbidity is followed with a photometer. The time elapsed to reach 90% of the initial turbidity is recorded (t ) and the pseudo rate constant of oil solubilization is calculated from... 

FIG. 18 The effect of chain length on the pseudo rate constants (Km (100 90)) of n-hexadecane solubilization by olefinsulfonates/dobanol 45-3 solutions at 40°C. AOS, a-olefinsulfonate IOS a, aged I-olefinsulfonate IOS d, directly hydrolyzed I-olefin-sulfonate. 

In summary, directly hydrolyzed IOS has good n-hexadecane solubilizing kinetics. This class of compounds then is attractive for detergent formulations where the kinetics of apolar soil removal is imperative. Also, it is observed that shifting the ionic head group toward the middle of the alkyl chain results in an... 

TABLE 25 Pseudo rate constants (Km (100/90) of n-Hexadecane Solubilization by Olefinsulfonate/DOBANOL 25-9 Solutions at 40 °C... 

Lyophilization of 1,2-dipalmitoyl-OT-3-glycerophosphorylcholine, n-hexadecan-1 -ol, tyloxapol solution in 0.1 n NaCl. 

Asperger O, A Nanmann, H-P Kleber (1981) Occnrrence of cytochrome P-450 in Acinetobacter strains after growth on n-hexadecane. FEMS Microbiol Lett 11 309-312. 

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