Storage flask

In static runs gas is supplied to the ion source only at a rate sufficient to compensate the outflow through the leak (0.5 cc./sec. for air, equal to conductance of leak). The gas mixtures were prepared in two 2-liter storage flasks of the gas handling system. Flow runs can be made by passing gas through the ion source. Different flow rates were obtained by interposing capillary tubes in series with the flow system. Flow rates with an average linear velocity of up to 10 meters sec.-1 could be obtained. Since the distance from the foil window to the leak is about 3 cm., the contact time for irradiation at this velocity is some 3 msec. 

The coals were crushed to —20 mesh but were not further size segregated to avoid selective separation of the petrographic constituents of the coal. Analytical reagent grade methanol was obtained from Fisher Scientific Co. and used without further purification. It was stored over anhydrous calcium sulfate and degassed by intermittent evacuation of the storage flask. Reagent... 

Trimethylgallium is a colorless liquid mp — 16°C, bp 56°C. It ignites spontaneously in air (pyrophoric) and decomposes violently in water. It can be stored indefinitely at room temperature under an inert atmosphere, or under its own vapor pressure, in a storage flask such as those illustrated in Fig. 4. It is a strong Lewis acid, forming many stable complexes its chemical and physical properties have been fully reviewed.12 HNMR (C6D6, rel. Me4Si, 5 ppm) — 0.12(s). 

The product, which at this point is bright yellow due to traces of dissolved base, is retrapped at room temperature, in vacuo, from one storage flask to another. If the product is now not completely colorless, the retrapping process is repeated. Yield 72 g (96% based on adduct, 93% based on cadmium dichloride). 

Sample History. All-malt microbrews containing 100 grams of malt which had been treated with 88 fxg. of labeled gibberellic acid were brewed according to the technique reported by Kneen (3). Fermentation was carried out for 7 days at 12° C. and after fermentation, the beer was transferred to storage flasks, chill-proofed, and stored in the cold for 3 weeks. After storage, the beer was filtered, carbonated, and bottled. 

Fig. 11. O-ring storage flask for solvents and solutions of Li(GaH4). O-ring joints are standard O 9/18. Needle valve is 4-mm Teflon in glass.

FIG. 2.5. Transfer of organomagnesium solution under inert atmosphere A, storage flask B, receiving flask C, inert gas in D, transfer tube E, sleeve F, to bubbler. 

Two-necked, round-bottomed flask (250 mL, graduated every 20 mL) or 250 mL graduated storage flask with glass stopcock on side arm... 

Equip the graduated storage flask with the double-ended filter closed on the top by a septum and purge this reaction set-up with argon. 

Transfer the ethereal p-anisyllithium solution in the storage flask by means of a steel cannula under argon pressure. After transfer, remove the double-ended filter and close the storage flask with a septum. 

Round-bottom flask (250 mL) with septum port syringe 5 mL D2O (99-1- percent) calcium carbide (3 g) D2O trap and 1-L storage flask with stopcocks two Dewars Dry Ice/isopropanol slurry liquid nitrogen basic alumina (optional). 

A small pellet of oil-free potassium is introduced into the storage flask, which is then evacuated. The potassium pellet is locally heated with a small gas flame until it boils and coats the flask walls with a metallic film. 

Add 10 mL of 95% ethanol and heat almost to boiling for 5 min on a steam bath with stirring. Then filter the hot mixture on a small Hirsch funnel. Scrape out the test tube with a spatula, let the tube drain thoroughly, and squeeze liquid out of the solid residue in the funnel with a spatula. Pour the yellow filtrate into a 125-mL Erlenmeyer flask. Then return the solid residue, with or without adhering filter paper, to the original test tube, add 10 mL of dichloromethane to effect an extraction, insert the condenser, and reflux the mixture for 3-4 min. Filter the yellow fitrate and add the filtrate to the storage flask. Repeat the extraction with two or three further 10-mL portions of dichloromethane, pour the combined extracts into a separatory funnel, add water and sodium chloride solution (to aid in layer separation). 

This method is used to standardize 2-butanol solutions in xylenes and is based on acetylation of the alcohol. To make the stock 2-butanol solution, add 74 g of 2-butanol to an inert 1-L volumetric flask and dilute to 1 L with xylenes. Mix thoroughly and transfer under nitrogen to a 1.5-L storage flask containing 4 A molecular sieves. Degas the solution by the freeze-pump-thaw technique (three times) and place the storage flask under nitrogen. 

We find it quite easy to isolate the sublimed product without the use of a drybox. The isolation procedure is as follows. The su-blimer is positioned horizontally, the stopper at the top is removed and with (Ar) flowing out of the flask the crystals are scraped from the walls and powdered using a stainless steel spatula. The product is then transfered to a storage flask connected through the side arm. 

Figure 16. Inexpensive solvent storage flask from which solvent or other liquids are dispensed by cannula or syringe.

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