CijHgNj. Made by heating o-pheny-lenediamine with glycerol, nitrobenzene and cone, sulphuric acid. It exists as a monohydrate, m.p. 94" C, or anhydrous, m.p. 117°C. It is used as a complexing reagent in the estimation of Fe and in the preparation of numer- [Pg.303]

The values of imua-, mA and m r are determined in the usual manner, but since the activity coefficient factor 7ha Tci h involves two univalent ions ill the numerator with a bivalent ion in the denominator, it will differ more from unity than docs the corresponding factor in equations (14) and (21) the usual extrapolation procedure is consequently liable to be less accurate. Utilizing the form [Pg.321]

There is a very good correspondence between the analytical and numerical results for temperature and velocity. The airflow rates differ, however, with a factor of 1.46 at a height of 2 m, whereas the correspondence at 4 m is very good. [Pg.541]

The structural types described m this section are but a tiny fraction of those pos sible The chemistry of heterocyclic aromatic compounds is a nch and varied held with numerous applications [Pg.461]

The null hypothesis tested with the F-ratio is a general hypothesis stating that the true coefficients are all zero (note that b, is not included). The / "-ratio has an F-distribution with df= m and

In principle, the idea of MD simulations is very simple one solves Newton s equations of motion for the interacting many-body system numerically on a computer. Thus, if 17( r, ) is the total potential acting on particle i (with mass m,) and position r,(t) at time t, one has to solve [Pg.296]

The calculations are made as follows. The exchanger is divided into small increments to allow numerical integrations. A tube wall temperature is first calculated and then QAV. The gas temperature and composition from an increment can then be calculated. If the gas composition is above saturation for the temperature, any excess condensation can occur as a fog. This allows the degree of fogging tendency to be quantified. Whenever possible, experimental data should be used to determine the ratio of heat transfer to m.ass transfer coefficients. This can be done with a simple wet and dry bulb temperature measurement using the components involved. [Pg.306]

The dimensions of permeabiUty become clear after rearranging equation 1 to solve for P. The permeabiUty must have dimensions of quantity of permeant (either mass or molar) times thickness ia the numerator with area times a time iaterval times pressure ia the denomiaator. Table 1 contains conversion factors for several common unit sets with the permeant quantity ia molar units. The unit nmol/(m-s-GPa) is used hereia for the permeabiUty of small molecules because this unit is SI, which is preferred ia current technical encyclopedias, and it is only a factor of 2, different from the commercial permeabihty unit, (cc(STP)-mil)/(100 in. datm). The molar character is useful for oxygen permeation, which could ultimately involve a chemical reaction, or carbon dioxide permeation, which is often related to the pressure in a beverage botde. [Pg.487]

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