Drechsel bottle

Petri bottle Wash bottle Drechsel bottle Impinger... 

Nitrogen is dried by passage through two Drechsel bottles containing concentrated sulfuric acid and potassium hydroxide pellets, respectively. 

For preparation of moist, oxygen-free nitrogen, the commercial gas is passed through (a) a 500-ml. Drechsel bottle containing a fresh solution of 25 g. of sodium hydroxide plus 5 g. of pyrogallol in 250 ml. of deaerated water, (b) a reversed, empty 500-ml. bottle, and (c) a 500-ml. bottle containing 250 ml. of deaerated water. 

Commercial hydrogen sulfide is passed through a (reversed) empty 500-ml. Drechsel gas-washing bottle and then through 250 ml. of deaerated water in a similar bottle (not reversed). 

Method A In a Drechsel bottle cooled to between —5 and —10 C was placed anhyd Et2NH (40.0g, 0.56 mol) and over a period of 10 h anhyd chlorotrifluoroethene (1 70.0 g, 0.6 mol) was bubbled through it. Once the addition was complete the mixture was distilled under reduced pressure to give 2 yield 70 g (61%) bp 33 C/ 6Torr. 

The reflux condenser is fitted with an outlet that is connected with Tygon tubing to a Drechsel bottle and then an inverted funnel in a crystallizing dish filled with water which serves as the HCI trap (the submitters used Lab Glass LG-8605). 

Small quantities of ammonia may if necessary be prepared with the aid of the apparatus depicted in Fig. 4.2. Concentrated ammonia solution (d 0.88) is gently heated in the flask surmounted by an efficient reflux condenser. The gas is further dried by passage through a column which is loosely packed with soda lime or calcium oxide lumps, and is then passed through a Drechsel bottle to act as a safety trap. 

This gas is conveniently generated from calcium carbonate chips (marble) and dilute hydrochloric acid (1 1) in a Kipp s apparatus it should be passed through a Drechsel bottle containing water or sodium hydrogen carbonate solution to remove acid spray and, if required dry, through two further Drechsel bottles charged with concentrated sulphuric acid. 

Large quantities of carbon dioxide may be obtained from a cylinder of the liquefied gas the gas should be dried by passing it through two Drechsel bottles containing concentrated sulphuric acid. A little air is present in the gas. 

Method 1 (from concentrated sulphuric acid and fused ammonium chloride). The most convenient procedure is to allow concentrated sulphuric acid to react with lumps of fused ammonium chloride in a Kipp s apparatus. The gas may be dried by passage through a Drechsel bottle containing concentrated sulphuric acid the latter should be followed by an empty Drechsel bottle as a precaution against sucking back of the contents of the reaction vessel. 

Method 2 (from concentrated sulphuric acid and concentrated hydrochloric acid). The apparatus shown in Fig. 4.4 is employed. The upper funnel has a capacity of 100 ml and has an appropriate length of capillary tubing fused to the outlet tube the lower funnel has a capacity of 500 ml. When the capillary tube is filled with concentrated hydrochloric acid, there is sufficient hydrostatic pressure to force the hydrochloric acid into the sulphuric acid. The Drechsel bottle (A) contains concentrated sulphuric acid and the other acts as a safety trap the whole apparatus must be mounted on a heavy stand. 

Place 116g (126 ml, 1 mol) of dry hexanoic acid in a 250-ml Drechsel bottle and cool in ice. Pass in 21-23 g of keten (Section 2.17.3, p. 100) (1). Carefully distil the reaction mixture through a highly efficient fractionating column... 

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