Oxygen—continued

The operator thought valve B was open, so he shut valve A. This stopped the flow of gas to No. 1 reaetor. The oxygen flow was controlled by a ratio controller, but it had a zero error, and a small flow of oxygen continued. 

An ethylene oxide plant tripped, and a light on the panel told the operator that the oxygen valve had closed. Because the plant was going to be restarted immediately, he did not close the hand-operated isolation valve as well. Before the plant could be restarted, an explosion occurred. The oxygen valve had not closed, and oxygen continued to enter the plant (Figure 14-5). 

However, where oxygen continues to infiltrate, the corrosion reaction continues unabated and ferric hydroxide is formed ... 

Conclusions - Dissolved Oxygen. Continued attainment of DO standards in the Willamette Basin in the face of a current regional growth rate of 1% yr will require continued augmentation of flow as well as pollution control, particularly with respect to ammonia. Based on model results discussed, there appears to be little justification for the installation of advanced wastewater treatment systems in the basin for the purpose of maintaining acceptable DO levels. 

Fig. 8.7. Evolution of oxygen. Unlike the other a elements, oxygen continues to grow more abundant at low metaUicities. This effect remains unexplained. However, the validity of the data has been contested. (Courtesy of Boesgaard and co-workers.)...

Figure 2 illustrates the effect of incremental changes in ruthenium catalyst content upon the production of acetic acid and its C1--C2 alkyl acetate esters. Acetic acid production is maximized at Ru/Co ratios of ca. 1.0 1.5 however, the data in Figure 2 do show an approximate first order dependence of lOAc (acetic acid plus acetate esters) upon initial ruthenium content—at least up to the 2/1, Ru/Co stoichiometry under the chosen conditions. Selectivity to acetic acid in the liquid product peaks at 92 wt % (carbon efficiency 95 mol %) for a catalyst combination with initially low Ru/Co ratios (e.g. 1 4). The formation of C1-C2 alkanols and their acetate esters rapidly exceeds acetic acid productivity when the Ru/Co atomic ratio is raised above 1.5, although two-carbon oxygenates continue to be the predominant fraction. Smaller quantities of glycol may also be in evidence. 

XVIII XVIII, 1st 1934 2504-2665 One Cyclic Oxygen (continued). Carbonyl compounds (continued) ... 

Fiq. 7. Reaction rates on plane faces of a copper crystal at 400° with 5% oxygen (continuous-flow system). 

For optimum activity, nickelic, cobaltic, and ferric oxides must be prepared in a finely divided state, free from adsorbed impurities. Cobaltic and nickelic oxides show a variable oxygen content, being mixtures of more than one oxide, and give up or take up oxygen continuously, according to conditions (22,49). 

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