On reaction products

Change in feed composition. This may happen due to change in suppliers or due to introduction of reworked material. Unwanted effect on reaction products, by-products. Varying inhibitor concentrations in monomers from different vendors. Potential for runaway reaction. 

The nature of the brominating medium has an influence on reaction products. Although there is no need for strongly acidic reagents, a buffer is frequently added to adsorb HBr [81H(15)1285]. When 2,3-dibromobenzo[f>]thiophene was brominated in sulfuric acid with silver sulfate present, a small amount of the 4-bromo (but none of the expected 5-bromo) derivative was observed [70JCS(C)1949]. 

Moye HA, Weintraub R. 1988. Comment on "Reaction products and rates of disappearance of simple bromoalkanes, 1,2-dibromopropane, and 1,2-dibromoethane in water." Environ Sci Technol 22 231. 

Fig. 18. Conversion of n-hexane over CCU chlorinated platinum-alumina catalyst effect of temperature on reaction products 86). (Reprinted with permission of North-Holland Publishing Company.)...

Difunctional bisphenol A type, based on reaction products of bisphenol A and epichlorohydrin... 

The effects of the reaction conditions and the catalytic properties of REY zeolites on reaction product yields and on the quality of the gasoline can now be examined. 

Table IV. Effect of Cs and Concentration in Synthetic Waste on Reaction Products ...

For the higher activity Ziegler-Natta catalysts (Table II) based on reaction products of specific magnesium, titanium, and aluminum compounds, the similarity in size, coordination preference, electronic structure, and electronegativity of Ti(IV), Mg(II), and Al(III) ions is reflected in structural parameters and chemical properties (38) (Table III). The similarity in size between Mg(II) and Ti(IV) probably permits an easy substitution between ions in a catalyst framework. 

First, it seems desirable, even prima facie, that we develop an intuition of how chemical reactions occur. For example, molecular orbital theory provides a fair amount of detailed intuition about the energetics of chemical reactions, i.e., when do we expect large activation barriers, when do we expect concerted reactions, what is the effect of an electrophilic substituent on reaction product distributions, etc. A similar intuition has not been available concerning the role of dynamics in chemical reactivity. It is reasonable, as a chemist, to ask how one could enhance energy transfer specifically into the reaction coordinate, thus to make the reaction more efficient and to produce better reaction yields with fewer byproducts. 

Since realistic wood feedstocks are heterogeneous, the uniform entity appropriate for fundamental studies to identify improved conditions for tar formation is the single particle. In it, the intraparticle conditions can be measured and related to process conditions that can be manipulated. In addition, the effect of heat and mass transfer rates on reaction products can be determined. The findings can be rationalized to all reactors in which the studied experimental conditions prevail. The investigation of reacting single particles has proven extremely successful in the development of catalytic reactors (2) and coal pyrolysis (3,4,5). 

FIGURE 13 The dependence of the first order rate constant fcj on reaction product fractal dimension for transesterification reaction in logarithmic coordinates. Type of kinetic curves Q ty. 1 - linear, 2 - autoaccelerated, 3 - autodecelerated. Vertical shaded fine indicates the value D... 

Table 3 demonstrates our data on reaction product stereo-contents measured at the initial olefin conversion 22 %, that is to say, far from equilibrium. At this conversion Z-isomers are predominant, when using cycloolefins C5, and C7-C9. However, among them Z-isomer contribution is the least for cyclopentene cometathesis. Probably these facts are connected... 

Component Flowrates, and then enter in all component flowrates 5 kmol/h for NH3 and 5 kmol/h for Oj. For thermal condition, set the pressure to 1 atm and temperature to 25°C. From Input in the toolbar menu, select Reaction Data, enter the reaction name and description and then click on Reaction = Product. Enter the reactant and the product as shown in Figure 3.11. Double click on the reactor R1 and from the pull-down menu of Reaction Set Name, select the conversion or the name being selected by the user. Save the file and click on Run. 

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