Glass wool filter

After stirring the diazotized solution for 15 minutes, it is slowly poured through a glass-wool filter into a solution of 180 g. (3.4 moles) of potassium iodide in 600 ml. of water. After standing overnight, the heavy dark oil is separated, washed successively with 10% aqueous sodium hydroxide, water, 5% aqueous sodium bisulfite and water, and then dried over magnesium sulfate. 

In the flask is placed 150 ml. of anhydrous ether, and 5.7 g. (4.1 atomic equivalents) of lithium foil is then added (Note 1). A solution of 56.6 g. (0.2 mole) of n-bromoiodobenzene in 300 ml. of anhydrous ether is added dropwise (Note 2). When a vigorous reaction commences, the stirrer is started and the flask is cooled in ice water to maintain the temperature at about lO. The reflux condenser is replaced by a thermometer, and the remainder of the n-bromoiodobenzene solution is added at a rate such that the temperature in the flask remains at about 10° (about 1.5 hours). When this addition is complete, 200 ml. of dry benzene is added the mixture is stirred at 10° for 1 hour and finally at room temperature for 1 hour. The mixture is then poured through a glass-wool filter on 200 g. of ice. 

For the preparation of gaseous S2O a vacuum hne is needed which should be well dried by pumping and baking. The partial pressure of S2O has to be kept well below 1 mbar (100 Pa). If only small amounts of S2O are needed a mixture of 2 g CuO and 10 g elemental sulfur is heated in a high vacuum to 250-400 °C. The hberated gas is passed through a glass wool filter to remove SO3 and sulfur vapor it then contains up to 40% S2O besides SO2 [9] ... 

The triethylamine is used to trap any hydrogen chloride present as the insoluble triethylammonium chloride which is collected in the glass wool filter. A reagent grade of triethylamine (b.p. 88°) was distilled from calcium hydride prior to use. 

At 20 mm. the water and alcohol are removed in one hour. If the water has not been completely removed before the alcohol extraction, there may be a small amount of salt left in the material after the alcohol is removed. This may be removed by decanting the product or by pouring it through a glass wool filter. 

MASS FLOW MEASUREMENT. The use of collectors for the determination of aerosol mass flow rates is reported. La Mer and Hochberg (10D) pass the mixture through a glass wool filter. Burgoyne and Cohen (5D) use a similar technique. A discussion of the efficiency of collector screens is given by Berly, First, and Silverman (3D). 

Insoluble Impurities.—From 1 to 2 grams of the substance, previously dried, are heated with about 100 c.c. of chloroform in a reflux apparatus on a water-bath, the liquid being afterwards filtered—preferably through a glass-wool filter, previously tared—and the insoluble residue washed with chloroform, dried and weighed. 

Prepare another funnel with anhydrous Na2S04 on top of the glass wool. Filter the combined petroleum ether extracts through the salt into a dry, clean evaporating dish. Evaporate the petroleum ether on the water bath at 60°C, as before. When dry, add 0.2 mL of petroleum ether and transfer the solution to a clean and dry test tube. 

Unchanged alcohol is removed by distillation from an oil bath until the residual material melts to a dark-colored liquid. It is then poured into a Claisen flask and distilled under reduced pressure, using a short air condenser and a Pyrex suction-flask as a receiver. Since aluminum ethylate tends to sublime, a glass-wool filter is inserted between the receiving flask and the vacuum line to prevent clogging. A free flame is necessary and distillation should be rapid. While the distillate is still liquid it is poured into a Pyrex flask and allowed to cool. It forms a tough, white mass which must be preserved in a well-stoppered flask to prevent adsorption of water vapor. A yield of 90 per cent of the theoretical amount may be obtained. 

The percentages of Cr, Cu and As found in the CCA treated wood, the pyrolysis residue, the scrubber liquid, the glass wool filter and the gas stream obtained in a typical pyrolysis experiment using the downdraft fixed bed reactor are given in Table 1. 

Pack the gel into a 5 ml disposable syringe fitted with a glass-wool filter and wash the gel with 10 ml of dilute HCl, pH 3.5, supplemented with 100 mM NaCl. 

The sample should be applied to the top of the column as evenly as possible, in as concentrated a solution of the eluting solvent as possible, avoiding disturbance of the column packing. The top of the column can be protected with a thin layer of sand, glass wool, filter paper or ballotini beads. When all of the sample has been adsorbed, the void can be filled with solvent and the chromatogram developed. The supply of solvent can be replenished as required. 

Beryllium hydroxide or basic beryllium carbonate is stirred with glacial acetic acid to a paste and evaporated to dryness in a laboratory oven at 120 to 130°C. The crude product thus formed is extracted with glacial acetic acid in a Soxhlet apparatus (using a glass wool filter) after cooling, it crystallizes from the extract in well-formed octahedra, which are filtered off and dried at 130°C. 

The mixture is cooled to room temperature andcompressed dry air is introduced via the reflux condenser, forcing the solution through the glass wool filter and into flask b. This transfer is carried out in stages, since the iodide solution in flask b must be concentrated from time to time by distilling excess CS 3 into flask d. Finally, three 100-ml. portions of CS3 are added to rinse out the last traces of product in a. these are also transferred to bi... 

The only fiIters- included in the reactor air-system are the glass wool filters at the inlets to thesystem. A brief description of the processing the air. encounters before entering the reactor is now gi Ven. ... 

Care needs to be exercised in the use of fuels and oxidants. If compressed air is used, it should be filtered before compression and as it leaves the high-pressure tank. Acetylene requires special care since it is supplied as a solution in acetone under pressure. As the pressure in the tank is reduced, considerable acetone may escape with the acetylene. A glass-wool filter will aid in restricting the flow of acetone into the burner. 

Saturated solutions were prepared by stirring the solid phase with distilled water in an electrically heated thermostat. The saturated solution was siphoned through a glass-wool filter into a weighed bottle. The composition was determined by converting the dissolved phosphate to... 

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