Reacting masses

Another technical development is that of high impact isotactic polypropylene in which rubber droplets are produced in situ during the polymerisation stage. After propylene homopolymerisation ethylene is added to the reacting mass in a... 

In addition Faraday recognized that, for different electrode reactions and the same amount of charge, the ratio of the reacting masses is equal to the ratio of the equivalent masses ... 

Wrong Solution Assume that the concentration declines exponentially according to Equation (1.24). To calculate the concentration, we need the density. Assume it varies linearly with the weight fraction of monomer. Then p=1012kg/m at the end of the reaction. To calculate the monomer concentrations, use a basis of 1 m of reacting mass. This gives... 

The empirical formula of a compound is determined from reacting mass data. 

Chemical equations can be used to work out reacting masses. A balanced equation tells us the numbers of moles of each reactant that are required to produce the expected amount(s) of product in a chemical reaction. 

Reacting masses can be used to work out chemical equations. If the mass of each substance taking part in a chemical reaction is known, the balanced chemical equation can then be constructed. 

Dump Systems For an inhibitor injection or quench system, the inhibitor or quenching medium is transferred from an external supply to the reactive material in a dump system, the reactive material is transferred from the storage/handling facility to a safer location that is the same size or, more commonly, larger than the normal capacity of the facility. This allows depressurizing and deinventory of the reacting mass from the facility in an out-of-control situation, such as an incipient runaway reaction. 

As has already been mentioned (p. 3), the velocity of a bimolecular reaction is proportional to the product of the reacting masses. Hence, if their concentrations are expressed in grammolecular weights the following simple relations hold ... 

Fig. 2 Time-dependent intensity profiles of Pf (A), PtO" ( ), Pt02 ( ), and the siun of all side products ( ) when reacting mass-selected [Pt, 02] with a mixtiu-e of N2O and CO. The inset shows the two different catalytic cycles involved...

It is most important that the temperature of the reaction mixture be not allowed to rise prematurely, since if it reaches 50° during the early stages the reaction velocity increases so rapidly that the contents are apt to boil out of the flask. For the same reason it appears necessary that a certain ratio between reacting mass and cooled surface be not exceeded. Runs of twice the above size have been carried out in a 5-I. flask without mishap, but temperature control was difficult and these conditions are extremely hazardous. A run of 4 kg. of ethylene chlorohydrin in a 12-I. flask was attempted, but rapidly went out of control. 

As with vapour pressure systems, for continuous or semi-batch reactions it may be possible to reduce the relief system size by taking into account the reduced accumulation of reacting mass See A2.4.1 and reference 10. 

Crosslinking is another important tool. It is essential to foam making because it gives the reacting mass the ability to trap CO2. Crosslinking is important for elastomers since it controls tensile strength and elasticity. 

Dry azidocarbondisulfide in contact at RT with Cls, either in gaseous form or in coned aq soln, causes a violent expln. Only a few degrees rise in temp can cause this reacting mass to explode, almost immedy, yielding the usual prods of decompn of the nalogenoid compd... 

For adiabatic self-heating (obtained for an infinitely reacting mass or a thermally isolated finite mass), y2T = 0, Consequently the heat... 

Some runs carried out under the same conditions but according to Procedure B gave the results represented by the points outside the curve, which indicate a higher conversion per hour. Such behavior might be explained by the fact that in the absence of water both swelling and dissolution of the elastomer into monomer are more rapid and complete hence, the subsequent dispersion of the reacting mass in water is favored. 

These relative masses can now be converted into actual or reacting masses by putting in mass units, for example, grams. 

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