Advances in Photochemistry by Noyes W

By Noyes W

Content material: Advances in Photochemistry; Contents; hugely complicated Photochemical Mechanisms; The Kinetics and Mechanism of Photochemical Oxidation of Aldehydes by way of Molecular Oxygen; Singlet and Triplet States: Benzene and straightforward fragrant Compounds; Photochemical Rearrangements of Conjugated Cyclic Ketones : the current country of Investigations; Photochemistry of Conjugated Dienes and Trienes; The Reactions of Sulfur Atoms; a few Photochemical modifications of Polyenic Compounds; The Photolysis of the Diazirines; writer Index; topic Index; Cumulative Index

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These boilers cool the gas and recover its heat in useful f o r m - steam (Abeck, 2003; Peippo et al, 1999). I lOm I cooled offgas radiation section I' "~" 'l I~ "li" 'i hot offgas t' "i l'l [tN 1 o J Fig. 2. Waste heat boiler for a copper smelting flash furnace (Peippo et al, 1999). Note, left to right: (i) flash furnace gas offtake; (ii) boiler radiation section with water tubes in walls; (iii) suspended water tube baffles in radiation section to evenly distribute gas flow; (iv) convection section with hanging water tubes.

Unfortunately, decreasing the input air/input sulfur ratio also decreases the of the gas (Fig. 5), potentially lowering catalytic oxidation efficiency. O 2 / S O 2 ratio An alternative way to increase S O 2 concentration (and decrease furnace exit gas volume) is to feed less N2 to the sulfur burning furnace - by replacing some air with oxygen (Miller and Parekh, 2004). 4 Target gas temperature Decreasing sulfur burning's air/sulfur ratio raises product gas temperature, Fig. 6. e. to raise % SO2-in-gas), this may damage the sulfur burning furnace or boiler.

An alternative is to pass Boliden Norzink exit gas through a column of activated PbS coated pumice (Dowa Process). 05 parts per million (Lossin and Windhager, 1999). 3) Scrubber exit gas is saturated with H20(g). This H20(g) must be removed prior to catalytic SO2 + 89 ~ SO3 oxidation- to avoid accidental downstream HzSO4(g) formation/corrosion after SO3 has formed. The HzO(g) is removed by: (a) cooling the gas then: 43 (b) contacting it with strong sulfuric acid, Chapter 6. Gas cooling is an inexpensive way to remove most of scrubber exit gas's H20(g), Fig.

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