Oxygen reservoir distribution

The total mass of oxygen consumed by the reactions listed, added to that contained in the atmosphere, sums to about 3.1 x 1019 kg. The result provides a reasonable balance between production and losses only because we have made an effort to maximize the oxygen consumption. On the whole, the budget is subject to much uncertainty and is as yet unsatisfactory. But the data show that the major reservoirs of oxygen are sulfate in seawater and in evaporites, and Fe203 in sedimentary rocks. Only 4% of total oxygen resides in the atmosphere. One must appreciate the peculiarity of this distribution. Since oxidative weathering causes a steady drain on 02, we can understand its presence in the atmosphere only if it is continuously... 

Figure 1. Circulation reactor for phenol conversion studies 1, packed bed of catalyst particles 2, oxygen saturation column 3, substrate solution reservoir 4, UV spectrophotometer 5, circulation pump 6, substrate solution reservoir for continuous feed 7, feed pump 8, product solution reservoir 9, air distribution device.

As was noted in Chapter 4, polyesters such as polyethylene terephthalate (PET) degrade mainly in a thin surface layer under the influence of light and oxygen. This suggests that photostabilisation in the bulk of an article will not be optimally used at best, portions of the additive distributed in the interior will act as a reservoir to replace stabiliser lost in the outer regions during any of the chemical or physical processes under way. 

Pressurizer. A small sidestream of fuel solution is continuously directed into the pressurizer, where it spills through a distribution header and drips down through an oxygen gas space to the liquid reservoir in the bottom of the vessel. The pressurizer liquid return line is connected to the suction side of the primary-loop circulating pump. Oxygen is added batchwise to the pressurizer to keep the fuel saturated at all times to prevent precipitation of uranium. As fission-product gases accumulate in the pressurizer, they are vented to the off-gas system, also in a batchwise operation. 

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