Magnesium oxide collection

When magnesium oxide is chlorinated in the presence of powdered coke or coal (qv), anhydrous magnesium chloride is formed. In the production of magnesium metal, briquettes containing CaCl2, KCl, NaCl, MgO, and carbon are chlorinated at a temperature such that the electrolyte or cell melt collects at the bottom of the chlorinator, enabling the Hquid to be transferred directly to the electrolytic cells. 

Rotary sampling devices called Rotorods have also been widely used for sampling airborne sprays.These devices are similar to the rotary samplers described above, but do not use Teflon or magnesium oxide slides for spray collection. Rather, droplets... 

A certain quantity of the spirit (e.g., 300 c.c.), together with the rinsings of the measuring vessel, is distilled with a few drops of sodium hydroxide solution or a little magnesium oxide to remove the fixed matters aud the colouring materials and to liberate the pyridine bases in case these are present partly as salts the amount of distillate collected is that of the spirit taken. 

The hydrazine is dissolved in isopropanol and 1% magnesium oxide is added. The mixture is stirred for 30 min and filtered. The filtrate is cooled with ice-bath and one equivalent of anhydrous HCI in isopropanol is added under vigorous stirring. The precipitates are collected by filtration and dried at 60°C under reduced pressure to afford white powder mp 147°-150°C. 

Experimental Comparison with Other Techniques. In order to check that the experimental setup shown in Figure 3 met the constraints formulation given in Equation 2, two alternate techniques were used to measure droplet size during selected tests. These were a magnesium-oxide (MgO) coated slide collection method and a single-beam Mie scattering technique. 

Magnesium Oxide Method for Drop Size Measurement. Droplet size may be determined from the impression made by a drop when collected on a coated slide. A layer of MgO has been used commonly as a collecting medium. Drops form a crater in the MgO on impaction. Based on past cahbrations (3, 4), the-diameter of this crater, as determined from microscopic observation, can then be related to droplet size. 

Magnesium oxide process. The magnesium oxide slurry is used to collect SO2, and the resulting magnesium sulfite is thermally treated to release the SO2 and regenerate the absorbent, as shown in Fig. 6. Like the Wellman-Lord process, this process... 

It is typical to install the spray-dryer before the plant fly-ash collector, so that the existing dust control equipment can be used to collect the used absorbent. Slaked lime [Ca(OH)2] is the most common absorbent, although sodium carbonate (Na2C03) is used in some plants. Spray-dryers have also been used with regener-able magnesium oxide absorbent. " ... 

The Kjeldahl digestion method is used to determine only the ammonia nitrogen content. Sodium hydroxide or magnesium oxide is used to raise the pH to above 12 to liberate the ammonia upon distillation, which is collected in a known amount of sulfuric acid. The excess sulfuric acid is titrated with sodium hydroxide and the percentage ammonia nitrogen is determined. Only ammonia-based fertilizer material should be analyzed using this method. 

When only BHT is present in the sample omit the second distillation. When only BHA is present, omit the addition of wopropyl alcohol to flask A, collect the first 180 ml of distillate and treat this as for Fraction II, above in addition, since the heating of the magnesium oxide trap is to prevent losses of BHT due to its adsorption by cold magnesium oxide suspension and such adsorption does not occur with BHA, it is not necessary to heat the Kjeldahl flask. 

Prepare a Grignard reagent from 24 -5 g. of magnesium turnings, 179 g. (157 ml.) of n-heptyl bromide (Section 111,37), and 300 ml. of di-n-butyl ether (1). Cool the solution to 0° and, with vigorous stirring, add an excess of ethylene oxide. Maintain the temperature at 0° for 1 hour after the ethylene oxide has been introduced, then allow the temperature to rise to 40° and maintain the mixture at this temperature for 1 hour. Finally heat the mixture on a water bath for 2 hours. Decompose the addition product and isolate the alcohol according to the procedure for n-hexyl alcohol (Section 111,18) the addition of benzene is unnecessary. Collect the n-nonyl alcohol at 95-100°/12 mm. The yield is 95 g. 

In a 500 ml. three-necked flask, equipped with a thermometer, a sealed Hershberg stirrer and a reflux condenser, place 32-5 g. of phosphoric oxide and add 115-5 g. (67-5 ml.) of 85 per cent, orthophosphoric acid (1). When the stirred mixture has cooled to room temperature, introduce 166 g. of potassium iodide and 22-5 g. of redistilled 1 4-butanediol (b.p. 228-230° or 133-135°/18 mm.). Heat the mixture with stirring at 100-120° for 4 hours. Cool the stirred mixture to room temperature and add 75 ml. of water and 125 ml. of ether. Separate the ethereal layer, decolourise it by shaking with 25 ml. of 10 per cent, sodium thiosulphate solution, wash with 100 ml. of cold, saturated sodium chloride solution, and dry with anhydrous magnesium sulphate. Remove the ether by flash distillation (Section 11,13 compare Fig. II, 13, 4) on a steam bath and distil the residue from a Claisen flask with fractionating side arm under diminished pressure. Collect the 1 4-diiodobutane at 110°/6 mm. the yield is 65 g. 

Fit a 750 ml. round-bottomed flask with a fractionating column attached to a condenser set for downward distillation. Place 500 g. of diacetone alcohol (the crude product is quite satisfactory), 01 g. of iodine and a few fragments of porous porcelain in the flask. Distil slowly. with a small free flame (best in an air bath) and collect the following fractions (a) 56-80° (acetone and a little mesityl oxide) (6) 80-126° (two layers, water and mesityl oxide) and (c) 126-131° (mesityl oxide). Whilst fraction (c) is distilling, separate the water from fraction (6), dry with anhydrous potassium carbonate or anhydrous magnesium sulphate, and fractionate from a small flask collect the mesityl oxide at 126-131°. The yield is about 400 g. 

Deuterioammonia (about 5 ml) is generated by adding deuterium oxide (14 ml) to a stirred suspension of magnesium nitride (20 g) in mineral oil (30 ml). Tlie deuterioammonia is collected directly in the reaction flask (equipped with a dry ice condenser) at —79° after passing through a trap which is kept at 0°. 

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