Flash effects

Fauveau and Le Paire 23 studied the anti-flash effect of potassium chloride and of other salts and concluded that the lowering of the temperature of the gas which undoubtedly results from their volatilization and dissociation is insufficient to account for the extinction of the flash. Prettre24 found that the chlorides of sodium and of lithium, and other alkali metal salts which are volatile, had the same effect as potassium chloride. He found that small amounts of potassium chloride, volatilized in mixtures of carbon monoxide and air, had a powerful anti-oxidant action and a correspondingly large effect in raising the temperature of inflammation of the gas. Some of his results are shown in the table below. He found that potassium chloride was without effect... 

Asymmetry (asymmetric particles give a flashing effect, owing to different scattering intensities for different orientations). 

Thunder is the noise caused by the explosion of a composition and which emotionally increases the activity of the firework display. The composition which also produces a flash effect is called "Flash thunder". 

Inappropriate feed condition can be visualised by a large enthalpy variation near the feed. Excessively superheated feed could develop a large amount of vapour because of a flashing effect, dangerous for the hydrodynamics of internals. The same consequence may have an excessive sub-cooled feed, this time by a quenching effect. These situations can be easily... 

In practice, flash distillation is rarely used as a single separation stage more often it is used in combination with other distillation processes without a preheater to arise the flash effect. 

The sidestream of first effect, or flash effect, slurry that goes to sulfate removal is centrifuged and washed if necessary for the recovery of mother liquor. The liquor and wash solution drop to the slurry tank. The collected salt, which is 15-20% Na2S04, is purged. The amount of NaCl lost, in one particular design, was about 1 % of the quantity purchased. Section 9.4.2.1 describes more elaborate systems that remove sulfate more selectively. 

Samples 5 and 6. Show the mould full, but with heavy sink marks - there is no packing yet. There are witness marks at the weld points, indicating weakness. Sample 6 is slightly better packed than sample 5. (The whitish splash marks on sample 6 are due to a trace of moisture in the polymer.) Plate 22. Flashing effect of hatching. 

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