Of n-hexane

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. 

Naphthenes always have higher octane numbers —RON and MON— than their non-cyclic homologs for example, the RON of n-hexane is 24.8 while cyclohexane attains 83. 

Fig. XVII-21. Continued) (c) Isosteric heats of adsorption of n-hexane on ice powder Vm = 0.073 cm STP. (From Ref. 125). (d) Isosteric heats of adsorption of Ar on graphitized carbon black having the indicated number of preadsorbed layers of ethylene. (From Ref. 126.)...

Fig. XVII-23. (a) Entropy enthalpy, and free energy of adsorption relative to the liquid state of N2 on Graphon at 78.3 K (From Ref. 89.) b) Differential entropies of adsorption of n-hexane on (1) 1700°C heat-treated Spheron 6, (2) 2800°C heat-treated, (3) 3000°C heat-treated, and (4) Sterling MT-1, 3100°C heat-treated. (From Ref 18.)...

Two reactants. In the preparation of n-hexane, 61 5 g. of n-propyl bromide were treated with 23 g. of sodium and 18 0 g. of n-hexane were ultimately isolated. 

It is evident from the equation that the sodium is used in excess. Actually 61 5 g. of n-propyl bromide is 0 5 gram mol this will react with 0 5 gram atom or 11-5 g. of sodium, so that 100 per cent, excess was actually employed. The theoretical yield of n-hexane will be 0-25 gram mol or 21-5 g., since 2 mols of n-propyl bromide give 1 mol of n-hexane. The actual yield was 18 g., hence the percentage yield is (18/21-5) X 100 = 84 per cent. 

Bond line formula of n pentane Bond line formula of n hexane... 

Fig. 5.10 The adsorption isotherms of n-hexane (A) and of water (B) on graphitized carbon black.Solid symbols denote desorption. (After...

Polyvinyl acetate [9003-20-7]. Ppted from acetone by addition of n-hexane. 

Tri-n-butylammonium nitrate [33850-87-2] IVI 304.5. Crystd from mixtures of n-hexane and acetone (95 5). Dried over P2O5. 

As an example of the use of the nomograph, the line is shown which would be drawn to determine the solubility of n-hexane in water at 25°C. The coordinates given in Table 1 for normal paraffins have been used X = 15.0, Y = 20.0. The predicted solubility is 2 x 10 mole fraction The experimental value is 1.98 x 10as given by McAuliffe and Price. ... 

The column was operated in the normal phase mode using mixtures of n-hexane and ethanol as the mobile phase. Equation (13) is validated by the curves relating the corrected retention volume to the reciprocal of the volume fraction of ethanol in Figure 19. It is seen that an excellent linear relationship is obtained between the corrected retention volume and the reciprocal of the volume fraction of ethanol. 

An industrial example of a eonseeutive reversible reaetion is the eatalytie isomerization reaetions of n-hexane to 2-methyl pentane and 3-methyl pentane and is represented as ... 

Preparation of 5-(3-Methylaminopropyl)-5H-Dibenzo[a,d]Cycloheptene from 5-[3-(N-Formyl-N-Methylj-Aminopropyl]SH-Dibenzo[a/i]Cycloheptene 29.5 grams of 5-[3-(N-formyl-N-methyD-aminoprOpyl] -5H-dibenzo[a,d] cycloheptene is refluxed for 24 hours under nitrogen in a solution of 36.3 grams of potassium hydroxide in 378 ml of n-butanol. After cooling to room temperature, the solvent Is evaporated in vacuo, the residue is stirred with 200 ml of water, 300 ml of n-hexane, the layers separated, the water layer extracted with 100 ml of n-hexane and the combined hexane layers washed with water (2 x 100 ml) and then with... 

The moist cells were suspended in 750 parts of volume of ethanol and extracted by warming at 60°C for 1 hour. A total of 3 extractions were carried out in a similar manner and the extracts were pooled, diluted with water and further extracted three times with 1,000 parts of volume portions of n-hexane. The n-hexane layer was concentrated to dryness under reduced pressure to recover 4.12 parts of a yellow oil. This oily residue was dissolved in 6 parts by volume of benzene and passed through a column (500 parts by volume capacity) packed with Floridil (100 to 200 meshes). Elution was carried out using benzene and the eluate was collected in 10 parts by volume fractions. Each fraction was analyzed by thin-layer chromatography and color reaction and the fractions rich in ubiquinone-10 were pooled and concentrated under reduced pressure. By this procedure was obtained 0.562 part of a yellow oil. This product was dissolved in 5 parts by volume of chloroform, coated onto a thin layer plate of silica gel GF254 (silica gel with calcium sulfate) and developed with benzene. The fractions corresponding to ubiquinone-10 were extracted, whereby 0.054 part of a yellow oil was obtained. This oil was dissolved in 10 parts by volume of ethanol and allowed to cool, whereupon 0.029 part of yellow crystals of ubiquinone-10 were obtained, its melting point 4B°to 50°C. 

Manganese naphthenate may he used as an oxidation catalyst. Rouchaud and Lutete have made an in-depth study of the liquid phase oxidation of n-hexane using manganese naphthenate. A yield of 83% of C1-C5 acids relative to n-hexane was reported. The highest yield of these acids was for acetic acid followed hy formic acid. The lowest yield was observed for pentanoic acid. 

In experiments in which the effect of monomer concentration was studied the polarity of the medium was maintained by replacing aliquots of the monomers by /i-hexane cosolvent, so that the total volume of n-hexane and monomer remained constant. This technique was also used in model studies. 

It should be emphasized that Si-H containing compounds should be carefully handled during purification so as to avoid hydrolysis of Si-H bonds. An effective method to suppress hydrolysis of Si-H bonds is to reduce the polarity of the medium by the addition of a large amount of n-hexane before the aluminum compound is removed by washing with dilute cold HC1 solution. 

Figure 9.12. Bifunctional catalysis in the reforming of n-hexane. [After J.H. Sinfelt, Adu. Chem. Eng. 5 (1964) 37.]...

To test this theory, a mixture of n-hexane and Relabeled 1-hexene was reacted in hydrogen over the catalyst at various space velocities. The specific activity of each of the products (the n-hexenes were lumped together) are shown in Figure 2. The important observation is made at zero conversion. When extrapolated to Infinite space velocity, the benzene has approximately the same specific activity as the hexene, thus clearly indicating that essentially all the benzene is formed in a reaction sequence that involves equilibrium with gaseous n-hexenes. It may then be concluded that olefins are intermediates in the aromatiza-tion process. 

When introducing a mixture of n-hexane and 2-2 dimethylbutane (45/55 molar ratio), almost only n-hexane permeates the permeate contains up to 99.5% of the linear isomer (Figure 10). 

Figure 10. N-hexane ( ) / 2-2 dimethylbutane ( ) separation with the composite zeolite-alumina membrane (fluxes in the permeate as a function of the temperature). A mixture of n-hexane. 2-2 dimethylbutane and nitrogen (5 6 89) was fed in the tube (Fig. 2) with a flow rate of 2 1/h. Sweep gas (N2), countercurrent mode, flow rate 0.5 1/h.

The products of the oxidation reaction were analysed by gas chromatography (Hewlett Packard, 5880 A), employing a FID detector and equipped with a capillary column (50 m x 0.25 mm crosslinked methyl silicone gum). The reactants and products of n-hexane oxidation were analysed by gas chromatography (Hewlett Packard, 5890) equipped with a FFAP column (30 m X 0.25 mm). The identity of the products was further confined by GC-MS (Shimadzu QCMC-QP 2000A). 

Table 2 Oxidation of n-hexane with O over phthalocyanines...

The addition of a further equivalent of neutral ligand to a suspension of [ AuAg (C6F5)2L J in dichloromethane leads to a colorless solution which upon addition of n-hexane precipitates complexesof the type [AgLL ][Au(C6F5)2] with L = Py, L = py or L = phen, bipy, L = PPh3. Taking into account all available data, the probable formation of these complexes is shown in the Equation 3.11 ... 

---