Cyclohexane density

Wt % cyclohexane Density after drying (g/cm ) Porosity (%) Pore diameter (pm) IPD (pm)... 

Acid diiodine Base iodocyclohexane Solvent cyclohexane Density (25 0 = 0.7735 Path length = 1 cm Wavelength (nm) = 470.15 nm Stock solution of acid Acid weight = 0.2218 Solution weight = 77.5447 Molar mass = 253.81 g mof Molar mass = 210.06 g mol Molar mass = 84.16 g mol dd/dt = 0.00101 Temperature = 16.1 °C Stock solution of base Base weight = 4.7773 Solution weight = 27.3742 ... 

From stochastic molecnlar dynamics calcnlations on the same system, in the viscosity regime covered by the experiment, it appears that intra- and intennolecnlar energy flow occur on comparable time scales, which leads to the conclnsion that cyclohexane isomerization in liquid CS2 is an activated process [99]. Classical molecnlar dynamics calcnlations [104] also reprodnce the observed non-monotonic viscosity dependence of ic. Furthennore, they also yield a solvent contribntion to the free energy of activation for tlie isomerization reaction which in liquid CS, increases by abont 0.4 kJ moC when the solvent density is increased from 1.3 to 1.5 g cm T Tims the molecnlar dynamics calcnlations support the conclnsion that the high-pressure limit of this unimolecular reaction is not attained in liquid solntion at ambient pressure. It has to be remembered, though, that the analysis of the measnred isomerization rates depends critically on the estimated valne of... 

Now calculate the molecular weight of the substance precisely as described on p. 442. The weight of the solvent employed may be calculated from the following densities methanol, 0 810 rectified spirit, 0-807 acetone, 0 797 ethyl acetate, 0 905 chloroform, 1 504 carbon tetrachloride, 1 582 benzene, 0 880 toluene, 0-871 cyclohexane, 0-724 i, 2-dichloroethane, 1 252. 

Fig.2 and Fig.3 show the typical liquid velocity and gas hold up distribution in the ALR. From the figures, one notices that the cyclohexane circulates in the ALR under the density difference between the riser and the downcomer. An apparent large vortex appears near the air sparger when the circulating liquid flows fi om the downcomer to the riser at the bottom. In the riser, liquid velocity near the draft-tube is much larger than that near the reactor wall, the latter moved somewhat downward. The gas holdup is nonuniform in the reactor, most gas exists in the riser while only a little appears in the dowmcomer. 

A wide variety of methodologies have been employed for the analysis of antioxidants in polymers and some standard methods are available. For high-density polyethylene ASTM method D5524 (ASTM International) — Determination of phenolic antioxidants in high-density polyethylene, describes a method whereby the sample is ground to a small particle size and then extracted by refluxing with cyclohexane. The cyclohexane extract is then examined by reverse-phase HPLC with UV detection. 

Before we can apply our model, we have to assign values to the parameters x in Equation 2 and r and 1 in Equation 4. The quantity x is simply defined as pQM/ppM0, where pQ and p are the densities of cyclohexane and PS, respectively, and Mq ana M their respective moleculair weights. The choice for r and 1 is less... 

Preparative electrochemical reduction of aryltrimethylsilanes in methyl-amine in the presence of LiCl gives the Birch-type products, 1,4-cyclohexan-dienes (Scheme 34) [6], A mechanism involving the electrochemical formation of lithium metal which chemically reduces the substrate has been suggested. The hydrogen atom is introduced on the carbon adjacent to the silicon preferentially. This regioselectivity is consistent with the spin density of the anion radical determined by ESR spectroscopy (Sect. 2.2.1). 

Allinger has concluded that for cyclohexanes, the isomer which has the higher boiling point, refractive index and density is the one which has less stable configuration. 

Hm for steam + n-heptane calculated by the above method is shown by the dashed lines in figure 6. Considering the simplicity of the model and the fact that no adjustable parameters have been used, agreement with experiment is remarkable. For mixtures of steam + n-hexane, benzene and cyclohexane agreement with experiment is much the same. At low densities the model reproduces the curvature of the lines through the results better than the virial equation of state. The method fails to fully reproduce the downward turn of the experimental curves at pressures near saturation, but does marginally better in this region than the P-R equation with k. = -0.3. At supercritical temperatures the model seems to... 

In a completely different interpretation Zefirov (242) proposed a new concept of frontier-orbital mixing (243) to explain how conformational and electronic effects in monosubstituted cyclohexanes are transmitted to remote 8-carbon atoms (Scheme 36). The orbitals at C(l) and C(4) in 112 are considered to be equatorial (242). A perturbation at C(l) (H is replaced by X) produces an electron-density shift from H(4) toward C(4) (242), which is associated with an upheld shift of the latter s signal. Although this approach appears to be quite crude and does not account for axial substituents, it deserves fiirther attention. 

Examples 22-25, all for cyclohexane dehydrogenation over Pt, are similar to the examples just discussed in that the data are all for surface reactions. Also with each of them the log L value calculated for Step 5 is between 8 and 10. We reported similar results and log L calculations (109) and suggested, using independent evidence of Boudart (110), that the site density is not as low as our TST calculations indicate. Thus, the log L calculation can be used to demonstrate the existence of a complexity that might not otherwise be detected, in this case, the possibility that cyclohexene is an intermediate. 

We have also investigated the electrooxidation of phenylethanoate, a system where there is no proton-loss pathway from the intermediate carbocation. Tab. 6.14 shows relative product ratios for phenylacetate in similiar conditions to those used for cyclohexane carboxylate, but employing 100 mA cm current density [59,60]. 

Aminabhavi, T.M. and Banerjee, K. Density, viscosity, refractive index, and speed of sound in binary mixtures of dimethyl carbonate with methanol, chloroform, carbon tetrachloride, cyclohexane, and dichloromethane in the temperature interval (298.15-308.15) K, / Chem. Eng. Data, 43(6) 1096-1101,1998a. 

Cyclohexane and water do not mix together. We say that they are immiscible. Because cyclohexane has a lower density than water, it forms a layer above the aqueous potassium iodide solution when the two are mixed together. 

Fig. 36. Density of epoxy networks prepared via CIPS with cyclohexane before and after the drying procedure...

The density drop between the transparent sample with initially 15 wt % cyclohexane, and the opaque sample with 16 wt % cyclohexane, is around 17%. We... 

Fig. 56. Density of solvent-modified and macroporous cyanurates prepared with various amounts of cyclohexane via CIPS...

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