Volatile control

Volatile control instrumentation records (distributive control systems—DCS—data) perform complete system backup of data... 

Both low-end and high-end volatility limits are established. Low-end volatility control ensures that fuel will vaporize adequately for engine starting and distribution throughout the combustion system. Upper-end volatility limits ensure that vapor locking or fuel line icing will not occur. Isopentane and certain C5 fractions are used to help control vapor pressure. 

Ethyl acetate has the lowest boiling temperature in the mixture and therefore has the highest volatility. Controlled removal of ethyl acetate by distillation will improve the conversion of the reactants by shifting the chemical equilibrium to further right. This will also increase the yield proportionately. 

The REEs in most aluminum-rich chondrules from carbonaceous chondrites studied are unfractionated (Kring and Boynton, 1990 Weisbergef fll., 1991). However, some have highly fractionated REE patterns, similar to volatility-controlled group 11 and ultrarefractory patterns seen in refractory inclusions (Kring and Boynton, 1990 Misawa and Nakamura, 1988, 1996). 

The combination of volatility controlled fractionations found in virtually all solar system materials with experimental and theoretical characterizations of the conditions and consequences of evaporation and condensation allows powerful constraints to be placed on physicochemical processes and the timescales on which... 

Convincing evidence of live Be has so far only been found in refractory inclusions because these samples exhibit large volatility controlled Be-B fractionation. A tantalizing hint for Be was found in one anorthite-rich chondrule from a highly unequilibrated (C03) chondrite the Be-B correlation diagram displays a large amount of scatter, but an initial Be/ Be ratio of 7.2 2.9 X 10 " may be calculated (Sugiura,... 

Allegre C. J., Manhes G., and Lewin E. (2001) Chemical composition of the Earth and the volatility control on planetary genetics. Earth Planet. Sci. Lett. 185, 49-69. 

Volatile Control blend Esculetin (10 mM) Control mucus... 

Figure 1 shows the concentration ratios for CM chondrites to Cl chondrites as a function of condensation temperature. The symbols indicate the mineral phase hosting the elements. There is a smooth decrease in the concentration ratio with condensation temperatures which is independent of mineral host phase. This correlation indicates that the elemental abundances in CM chondrites are volatility controlled. The higher concentration ratio for refractory elements plots above unity and reflects that CM chondrites accumulated a higher proportion of refractory elements. The ratio below unity is for the volatile elements incomplete condensation or accumulation. This limits the use of CM chondrites as abundance standards for elements with condensation temperatures less than 1500 K. (see chapter by B. Fegley and L. Schaefer in this volume for condensation chemistry of the elements). 

Reaction of Na2TiCl4 with NMe3 results in oxidation of the halide, leading to the formation of TiCl3(NMe3)2. Dialkylamides of TP can be prepared by the volatility-controlled disproportionation of TP . ... 

Volatile control is crucial for the production of void-free phenolic-type laminates. A commercial vacuum-bag moldable phenolic prepreg system was used to test two types of vacuum-bag (VB) processes, namely single- (SVB) and double- (DVB) vacuum-bag processes. The DVB process enabled better control of volatiles, with the point of application of vacuum pressure selected to avoid excessive extravasation of resin to achieve the target resin content in the final consolidated laminate parts. Void-free quality parts have been produced using the DVB process, which exhibited improved mechanical properties compared to the parts produced by the SVB process (Hou et al., 2006). 

Lube Vacuum Distillation Unit (VDU) or Vacuum Pipestill (VPS) - Viscosity and Volatility Control... 

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