Oleate temperature

If the third substance dissolves in both liquids (and the solubility in each of the liquids is of the same order), the mutual solubility of the liquids will be increased and an upper C.S.T. will be lowered, as is the case when succinic acid or sodium oleate is added to the phenol - water system. A 0 083 molar solution of sodium oleate lowers the C.S.T. by 56 -7° this large effect has been applied industrially in the preparation of the disinfectant sold under the name of Lysol. Mixtures of tar acids (phenol cresols) do not mix completely with water at the ordinary temperature, but the addition of a small amount of soap ( = sodium oleate) lowers the miscibility temperature so that Lysol exists as a clear liquid at the ordinary temperature. 

Epilation is required for permanent hair removal. The most effective epilation process is electrolysis or a similar procedure. Epilation can also be achieved by pulling the fibers out of the skin. Eor this purpose, wax mixtures (rosia and beeswax) are blended with Hpids, for example, oleyl oleate, which melt at a suitable temperature (about 50—55°C). The mixture is appHed to the site (a cloth tape may be melted iato the mass) and after cooling is rapidly pulled off the skin. A similar process can be carried out with a tape impregnated with an aggressive adhesive. 

Methyl oleate [112-62-9] M 296.5, f -19.9 , b 217 /16mm, d 0.874, n 1.4522. Purified by fracuonal distn under reduced pressure, and by low temperature crystn from acetone. 

The influence of cosurfactant structure is best illustrated by using various isomeric alcohols with the same chain length. This is shown in Figure 4 for the system water, benzene, potassium oleate and amylic alcohols (25). The mass ratio of potassion oleate to COH is 3 5 and the temperature was 22°C. 

Complete reduction of unsaturated esters to sativated alcohols takes place when the esters are hydrogenated over Raney nickel at 50° and 150-200 atm [44] or over copper chromite at temperatures of 250-300° and pressures of 300-3 50 atm [52,1056] (p. 153). In contrast to most examples in the literature the reduction of ethyl oleate was achieved at atmospheric pressure and 270-280° over copper chromite, giving 80-90% yield of octadecanol [1074]. a.,P-Unsaturated lactones are reduced to saturated ethers or alcohols, depending... 

The effect of temperature and oleate adsorption on the growth of maghemite particles. J. Magn. Mag. Mat. 122 24-28... 

Fusion of zinc oxide with fatty acids at elevated temperatures produces fatty salts. Thus, fusion with oleic or linoleic acid forms zinc oleate, Zn(Ci7H33COO)2, or zinc linoleate, Zn(Ci7H3iCOO)2. 

The value of h the number of palmitate ions in the micelle is at least ten. The examination of a solution of potassium oleate at a temperature of 0T8°C. by these methods has resulted in the following values for the concentrations of the various substances present. 

A novel method for production of paraffinic hydrocarbons, suitable as diesel fuel, from renewable resources was illustrated. The fatty acid ethyl ester, ethyl stearate, was successfully converted with high catalyst activity and high selectivity towards formation of the desired product, heptadecane. Investigation of the impact of catalyst reduction showed that the reduction pretreatment had a beneficial effect on the formation of desired diesel compound. The non-pretreated catalyst dehydrogenated ethyl stearate to ethyl oleate. The experiments at different reaction temperatures, depicted that conversion of ethyl stearate was strongly dependent on reaction temperature with Eact=69 kj/mole, while product selectivities were almost constant. Complete conversion of ethyl stearate and very high selectivity towards desired product (95%) were achieved at 360°C. 

Add 200 pi water to the cell pellet and sonicate briefly at low power. Use 50 pi homogenate for a protein determination and 100 pi for lipid extraction. To 100 pi homogenate add 4 ml chloroform/methanol 2/1 (v/v). Leave for 1 h at room temperature and add 0.8 ml of 0.73% NaCl. Vortex and centrifuge for 5 min at 1000xg to separate the phases. Remove the lower chloroform phase and add 10 nmol cho-lesteryl oleate and 10 nmol triolein as a cold carrier. Dry the sample under nitrogen. Take the sample up in 25 pi chloroform/methanol 2/1 (v/v) and spot the sample on a silica gel plate (0.5 cm streak). Rinse the tube with 25 pi chloroform/methanol 2/1 (v/v) and spot the sample on a silica gel plate. Develop the plate with hexane/diethyl-ether/acetic acid, 70/30/1 (v/v/v). Remove the plate from the tank when the solvent front almost reaches the top, dry the plate, and expose briefly to iodine vapor to localize the cholesteryl oleate. Scrape the spots into scintillation vials, mix thoroughly, and count in a scintillation counter. 

Figure 7. The ternary system cholesteryl oleate-cholesterol-triolein (CO-C-TO) at different temperatures (10). The darkened region corresponds to one isotropic phase whereas the remainder consists of two or three phases.

Cholesteryl oleate (CO Aldrich, 97%) contained impurities which absorb strongly below 320 nm. Even after purification (see below) it developed extraneous absorptions unless stored and handled in the absence of air and below room temperature. The purification procedure has been described (10). The Isolated material exhibited an enantlotropic phase (T +c 41-42°C and Tc+i 55.0°C [lit (24) mp 50.5°C]) and no discernible absorption above 300 nm. Cholesteryl chloride (CC1) from Aldrich was recrystallized from 95% ethanol, mp 96.5-99°C (lit (9) 95-96°C). 

Ofor, O. (1995) Oleate adsorption at a Nigerian hematite-water interface effect of concentration, temperature, and pH on adsorption density. Journal of Colloid and Interface Science, 174, 345-50. 

Figure 8. Temperature versus pressure phase diagram of a micellar solution of sodium oleate, 13 wt % in water. (Adapted from ref. 19).

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