Alkali saturated vapors

It is now a well-recognized fact that the saturated vapors of alkali halides contain associated species (dimers, trimers, etc.) as well as the diatomic molecules. The first evidence of this behavior was an electron-Impact mass spectrometrlc study by Ionov (] ). He reported the observation of K2I and Na2l" , which he attributed to the process... 

In the free state, mercury is most poisonous as a vapor. Levels of mercury that exceed 0.05 mg Hg/m air are considered unsafe. Although we think of mercury as having a low vapor pressure, the concentration of Hg in its saturated vapor far exceeds this limit, and mercury vapor levels sometimes exceed safe limits where mercury is used— as in chlor-alkali plants, thermometer factories, and smelters. 

The properties of liquid metals can cause flow instability (oscillation) because of vapor pressure—temperature relationship. Most liquid metals, especially alkali metals, show a greater change in saturation temperature, corresponding to a given change of pressure, than does water. In a vertical system under gravitational force, the change of static pressure could appreciably alter the saturation temperature such that explosion -type flow oscillation would occur that would result in liquid... 

Rb, Cs) can be obtained using vapor-transport techniques [115]. Thereby, a weighed amoimt of Cjq is treated with a large excess of the alkali metal at 225 °C under vacuum. This procedure leads to the saturation-doped products MgC g. To these fullerides a specific amount of Cjq is added to give the desired stoichiometry. The process of the formation of is completed after a subsequent annealing... 

Note that the DP equivalence temperatures in Figure 14 are significantly lower for the atmospheric conditions characteristic of downstream units. Also, as the temperature decreases, the slag dissociation pressure-product decreases much faster than for the plasma, resulting in a super-saturated alkali vapor concentration... 

Although shallow-mantle xenoliths, hosted in alkali basalts, commonly contain C02-rich fluid inclusions (see below), there have been no reports, to the author s knowledge, of H20-rich fluid inclusions in these samples. The C02-rich fluid inclusions are commonly attributed to late, possibly magma-derived, metasomatism of the samples. If such metasomatism was produced by silicate- or carbonate-rich melts, ascent of such a melt could produce saturation in a C02-rich vapor, but H2O would partition strongly into either residual melt or hydrous phases such as phlogopite or amphibole. Thus, the absence of H2O in the fluid inclusions in these samples cannot be taken as evidence that the metasomatic agent was anhydrous. 

Oil. df 1.2132. g 1.4718. bpM 162 bp , 120. mp — 45°. Vapor pressure at 20 2.5 X IC fmmHg, Absorption spectra Anliker et aL. loc. cti. Misc with water and most organic solvents except saturated hydrocarbons. One gram dissolves in about 30 g hexane. Stable in neutral or acid media hydrolyzed by alkali. LDW orally in rats 24 mg/kg (Gaines). 

Boiling point, °C 138 Melting point, C -78 Flash point, C 33 Auto-ignitlon temperature, ° C 300 Relative density (water -1) 0.8 Relative vapor density (air-1) 3.0 Relative density at 20 ° C of saturated mixture vapor/air(air-1) 1.01 Vapor pressure, mm Hg at 20 C 2.3 Solubility in water, g/100 ml 2.7 Explosive limits, vol% in air 1.3-10.5 Electrical conductivity, pS/m 2.6 x 10 Relative molecular mass 88.1 Log P octanol/water 1.3 Grossformula 5 12 COLORLESS LIQUID WITH CHARACTERISTIC ODOR Vapor mixes readily with air. Reacts violently with oxidants, with risk of fire and explosion. Reacts violently with alkaline-earth and alkali metals, giving off flammable gas (- hydrogen). ... 

Boiling point, 166 Melting point, -47 Plash point, C 58 Auto-ignitlon temperature, ° C 640 Relative density (watsr>1) 0.9 Relative vapor density (air -1) 4.0 Relativs density at 20 of saturated mixture vapor/alr(alr>1) 1.0 Vapor pressure, mm Hg at 20 C 0.84 Solubility In water w Explosive limits, vol% in air 1.8-6.9 Relative molecular mass 116.2 Qrossformula 6 12 2 COLORLESS LIQUID Vapor mixes readily with air. Decomposes when heated or on oontact with acids or bases, forming acetone and mesityl oxide. Reacts violently with strong oxidants. Reacts with alkali metals, giving off hydrogen. ... 

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