1-Butene physical constants

Methyl-1-pentene [691-37-2] is alight, colorless, flammable fiquid its physical constants are also given in Table 1. It is an irritant and, in high concentrations, a narcotic. Like 1-butene, this chemical compound has a low flash point and represents a significant fire hazard when exposed to heat, flame, or oxidizing agents. 

Lower activation temperatures are usually preferred in commercial operations, despite the lower activity. The corresponding redistribution of sites results in improved polymer physical properties. An example is shown in Table 12, which is a list of the ESCR values, the resistance to chemical attack, of several ethylene-butene and ethylene-hexene copolymers. These copolymers were made at constant MI and density with Cr/ silica catalysts activated at various temperatures. The measured ESCR value decreases as the activation temperature is raised. This change results in part because the MW distribution is narrowed, but more so because the longest chains contain less branching.13... 

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... 

However, the extent of facilitation and the magnitude of the flux value are not constant for each alkene permeate. The facilitation factors are similar for both 1-hexene and 2-ethyl-l-butene signifying that the complexation reaction for these two molecules are very similar. The transport of 2,4,4-trimethyl-l-pentene exhibits both a lower flux and lower facilitation factor tiian for 1-hexene or 2-ethyl-l-butene. The reduced flux can be explained by the inaease in molecular size causing lower physical solubility and slower diffusion in the hydrated membrane. These effects are also reflected in the fluxes through Na+-form membranes. Alkane flux is dependent only upon solubility and diffusion in each membrane form. Similar alkane fluxes are observed for the Ag+- and Na+-exchanged membranes. 

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