Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Total partial

Commercially, a small amount of the 4,4 -MDA is isolated by distillation from PMDA. Depending on the process employed, the removal of MDA can be partial (as is done with the isocyanates) or total. Partial removal of MDA gives some processiag latitude but yields of 4,4 -MDA are reduced. Distillation residues from PMDA manufacture that contain less than 1% MDA pose a disposal problem. Processes for the regeneration of MDA by heating these residues ia the presence of aniline and an acid catalyst have been patented (33—35). Waste disposal of PMDA is expensive and reclamation processes could become commercially viable. The versatility of the isocyanate process, however, can be used to avoid the formation of low MDA content distillation residues. [Pg.250]

Figure. 3 (a) Partial pair correlation function.s gij(B.) in liquid K-Sb alloys, (b) Total, partial, and local electronic densities of states in liquid Ko.soSbo.so- Cf. text. [Pg.79]

The total partial pressure of chlorine immediately after the addition of the chlorine gas is therefore 1.28 + 0.870 bar = 2.15 bar. We draw up the following table, with all partial pressures in bar, noting a decrease for partial pressures of the products and an increase for the partial pressure of the reactant. [Pg.499]

Finally, the development of modified nanoparticles with a better hfetime and activities for various applications in catalysis remains an important challenge. Several recent investigations have made possible interesting results in various research areas around soluble nanoparticles synthesis, characterizations and their applications. In this context, total, partial or selective arene hydrogenations have received considerable attention and could still be... [Pg.265]

Assuming ideal liquid behavior, the total partial pressure of the organic phase is given by the sum of the partial pressures of its components according to Raoult s law. [Pg.218]

Finally, the development of modified nanoparticles having better stability and a longer lifetime has involved interesting results in diverse catalytic reactions. Efficient activities are obtained with these transition-metal colloids used as catalysts for the hydrogenation of various unsaturated substrates. Consequently, several recent investigations in total, partial or selective hydrogenation have received significant attention. [Pg.220]

Total partial pressure range (sum of the partial pressures of aU three MoOs vapor polymers) covered in these measurements is from about 9 X 10 to 4 X 10 s atm. Average particle diameters were 0.22 0.02 cm. Rates of uptake on the clay loam particles are shown at 0,10, and SO minutes. Dashed line indicates the rate of uptake calculated by Maxwell s equation... [Pg.53]

For flat plate geometry, the overall mass trasnfer flux,y (moles/area/ time), resulting from the total partial pressure profile over the boundary layer and across the pores is given by... [Pg.703]

The total partial molar enthalpy of sorption (AHj=aH ) is related to V°g through the Clausius-Clapeyron (18) equation ... [Pg.78]

The total partial molar Gibb s free energy of sorption (aG°t = aG°s) is directly related to Kp by... [Pg.79]

The total partial molar entropy of sorption (AS°t =AS°s) is then calculated using... [Pg.79]

Dalton s law of partial pressure is the total partial pressure of a mixture of the gas is equal to the sum of the partial pressure in a mixture of that gas. [Pg.203]

Table 15. Ratio of the s partial charge densities q / Ep) to the total partial densities qy(Ep) for electronic states at the Fermi level Ep and Knight shifts K, (in %) for intermetallic Zintl compounds AB The calculated direct contribution K - and the total spin contribution K< are listed. For comparison the Knight shift found experimentally in the Zintl (K ) phases and in the pure metals (KJ" ) are given too. For the AB compounds the theoretical values are shown for both the defect (de) and the stoichiometric (st) phases... Table 15. Ratio of the s partial charge densities q / Ep) to the total partial densities qy(Ep) for electronic states at the Fermi level Ep and Knight shifts K, (in %) for intermetallic Zintl compounds AB The calculated direct contribution K - and the total spin contribution K< are listed. For comparison the Knight shift found experimentally in the Zintl (K ) phases and in the pure metals (KJ" ) are given too. For the AB compounds the theoretical values are shown for both the defect (de) and the stoichiometric (st) phases...
Motility Abolition of infect ivity Total Partial ... [Pg.292]

Total Partial Total Partial Total Partial Total Partial Total Partial Total Partial Total Partial Total Partial... [Pg.1358]

A further consideration is the relative resistance to diffusion offered by maternal and fetal blood and the placental membranes. The total partial pressure difference between maternal and fetal blood is the sum of the pressure difference from the interior of the maternal erythrocyte to the maternal plasma, plus the pressure difference from the maternal plasma across the placental membrane to the fetal plasma, and the partial pressure difference from the fetal plasma to the interior of the fetal erythrocyte. These relations are diagrammed in Figure 1. The reciprocal of the diffusing capacity, the total resistance to diffusion, is the sum of the resistance of the maternal blood, the resistance of the placental membrane, and the resistance of the fetal blood (12). These resistances are depicted in Figure 1 and may be expressed as ... [Pg.100]

The preparative decomposition of magnesite may be carried out even at 500 C when a suitable atmosphere, e.g., air containing H3O and NH3 at a total partial pressure of 40 mm., is provided [19]. The gaseous atmosphere over the preparation also affects the particle size of the nascent solid phase. Thus, given identical decomposition temperatures, the particle size of MgO crystals formed from magnesite will decrease with decrease of the CO3 pressure during the decomposition [10]. [Pg.1665]

If equimolar solutions of two elements are sprayed into a flame, and the first does not form compounds (e.g. Na), while the second does (e.g. Li), then the partial pressures of the elements in all forms in the flame will be proportional to the strength of the solutions and will be the same, but the total partial pressure of the second element (X20) is made up of free metal (X2) and the hydroxide (XgOH). [Pg.192]

The total partial current densities are obtained by integration over the energy. [Pg.175]

The partial axial orientation model usually use for strongly oriented polymers was adjusted to samples of weakly aligned polymers and the parameters describing the orientation configuration were related to the dichroic ratios in four particular molecular chain distributions, i.e. randomly, totally, partially and elliptically oriented. A new method that led to the determination of these dichroic ratios from ATR spectra was developed. This method was based only on the use of three distinct polarisations of the beam. All the practical difficulties usually encountered in the other methods were thus eliminated. 28 refs. [Pg.86]

The graphical representation of the global and localized variables and of the spatial operators is shown in a three-dimensional Formal Graph in Graph 5.1. The preferred notation in Formal Graphs is the differential one instead of the del/nabla because it makes explicit the space variable used and allows the total/partial distinction. The use of functions with abbreviated names (grad, div, etc.) is an old notation which is not encouraged. [Pg.104]


See other pages where Total partial is mentioned: [Pg.344]    [Pg.45]    [Pg.595]    [Pg.366]    [Pg.305]    [Pg.3]    [Pg.4]    [Pg.172]    [Pg.31]    [Pg.463]    [Pg.382]    [Pg.453]    [Pg.114]    [Pg.22]    [Pg.126]    [Pg.49]    [Pg.86]    [Pg.716]    [Pg.595]    [Pg.359]    [Pg.70]    [Pg.449]    [Pg.2786]    [Pg.37]    [Pg.1478]   


SEARCH



Cephalosporin syntheses: partial total

Dalton’s Law of Partial Pressures The total

Partial Derivatives and Total Differentials

Partial and Total Condensers

Partial and Total Synthesis

Partial pressure versus total pressur

Recent Partial and Total Syntheses New Challenges for the Diels-Alder Reaction

Selected Total and Partial Syntheses

Total and Partial Vacuum Pressure Measurement

Total and partial density of states

© 2024 chempedia.info