Physical constants of ethylene

Table 1. Some Physical Constants of Ethylene Oxide, C2H4O...

Values for the physical constants of ethylene glycol dinitrate found by de Kreuk [14], and Boileau and Thomas [15] are given in Tables 2 and 3 respectively (p. 3). Dipole moments are given in Table 4 (p. 4). 

CASRN 75-21-8 molecular formula C2H4O FW 44.05 Chemical/Physical The second-order hydrolysis rate constant of ethylene oxide in 7.08 mM perchloric acid and 36.3 °C is 0.027/M-sec (Kirkovsky et al, 1998). 

Table I. Physical Constants of Diethylene Glycol—Ethylene Glycol Mixtures0...

V / 10 PHYSICAL CONSTANTS OF POLY(ETHYLENE) Dimensions of Linear Poiyethylene NkAeoiAes ... 

D. PHYSICAL CONSTANTS OF MODIFIED POLY(ETHYLENE-CO-TETRAFLUOROETHYLENE) -[CH2-CH2-CF2-CF2]-... 

Physical Constants of Modified Poly(ethylene-co-tetrafluoroethylene) V/47... 

Physical Constants of Poly(oxyethylene-oxyterephthaloyl) (Poly(ethylene terephthalate))... 

V/116 PHYSICAL CONSTANTS OF POLY(OXYETHYLENE-OXYTEREPHTHALOYL) (POLY(ETHYLENE TEREPHTHALATE))... 

Ethylene oxide aqueous solutions, physical properties of, 20 635t Ethylene oxide catalysts, 20 648-649 Ethylene oxide hydrolysis, rate constants for, 20 638t... 

Ivanchev et al. compared, under the same ethylene polymerization conditions, the performances of some supported systems with those of traditional ones. The authors not only found that the activity of supported systems is determined by the chemical-physical characteristics of the carrier, which influence the number and the propagation constant of the active centres, but also, in agreement with other authors that changes take place, in the elementary polymerization processes, such as to modify the polymer molecular structure. Indeed, as one can observe (Table 6), it is... 

The following procedure was used (10) ethylene was introduced into the reactor at various temperatures and pressures and allowed to remain in contact with the catalyst for various periods of time. To remove the gas phase and physically adsorbed ethylene, the catalyst was evacuated for 10 minutes at the reaction temperature and was then cooled to room temperature. (A constant amount of ethylene remains on the surface after evacuation for 10 to 30 minutes at room temperature and butene, adsorbed on the same sites, is not removed by evacuating at 80° in excess of 120 minutes (4). The highest reaction temperature used was 75°). The temperature-programmed desorption was carried out in the usual manner after the stream of helium had been diverted through the reactor. The desorbed gas was condensed in a... 

In their study of association in ammonia + acetylene mixtures, Cheh, O Connell, and Prausnitz calculated the physical contribution to B12 from potentials that included hard-core as well as multipole interactions. The existence of vapour-phase complexes of ethylene with ammonia and methanol and of methanol with pentane has been inferred from virial coefficient data. King and co-workers have obtained association constants for COj with naphthalene, methanol, ethanol, and diethyl ether, and for HgO with CO2 and... 

Bornhiitter [66] has published new experimental data on the prediction of droplet size in gas/liquid systems with relation to dripping processes as well as the breakdown of sprays and threads, using water, ethylene glycol and methanol. The evaluation of the experiments shows that the droplet diameter, acc. to Eq. (2-26), is independent of the specific liquid load and of the size and type of the packing. It does, however, depend on the wetting properties and the physical properties of the liquid. In the case of ceramic, the droplets are larger than for other materials, such as PP, PTFE and stainless steel. In terms of the adhesion work + cos0) 10 = 80 — 120, the constant Cp is approx. 1 0.15. 

The only physical property which has been studied for substituted vinylidene sets is the nmr chemical shift of the vinylidene proton in substituted ethylenes and in tra s-l,2-disubstituted ethylenes. The first attempt at correlating chemical shift data for substituted ethylenes with the Hammett equation appears to be the work of Banwell and Sheppard (53), who reported a correlation of A2 values with the or constants, the A2 values being defined by the equation... 

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