Cylinders ammonia

Alternatively a special gas reducing valve attached to the wide screw thread of the ammonia cylinder may be us. ... 

Never heat ammonia cylinders directly with steam or flames to speed up gas discharge. 

If an ammonia cylinder is not available the gas is obtained by heating concentrated ammonia solution in a round-bottomed flask over a screened flame. The gas must be dried by passage through a tower containing potassium hydroxide and good quicklime. The amount of ammonia required is calculated as follows (small excess). 

A 1-1. three-necked flask is equipped with a mercury-sealed stirrer, an inlet tube, and a reflux condenser which is connected through a soda-lime tube to a gas-absorption trap.1 The apparatus is dried in an oven and assembled rapidly to exclude moisture it is advisable to set up the apparatus in a hood to vent ammonia which may escape by accident. The flask is cooled in a Dry Ice-trichloroethylene bath, and 200 ml. of anhydrous (refrigeration grade) ammonia is introduced through the inlet tube from an ammonia cylinder which is either inverted or equipped with a siphon tube. Just before the apparatus is assembled, 8.1 g. (0.35 gram atom) of sodium is cut, weighed, and kept under kerosene in a small beaker. The Dry Ice bath is removed, the inlet tube is replaced by a rubber stopper, and a crystal of hydrated ferric nitrate (about 0.2 g.) is added. A small (about 5-mm.) cube of the sodium is cut, blotted rapidly with filter paper, and added quickly to the liquid ammonia. The solution is stirred until the blue color disappears, after which the remainder of the sodium is added in narrow, thin strips about as rapidly as... 

A 6-1. round-bottomed flask is used as the reaction vessel. This is fitted with a cork stopper, bored to carry a gas inlet tube, a reflux condenser, and an efficient mechanical stirrer. The inlet tube should penetrate as far as possible into the flask and is best fitted with a T-piece above the stopper, so that in case the end of the tube becomes blocked during the reaction a wire may be pushed through to free it. The other arm of the T is connected to an ammonia cylinder via a safety valve and a long potassium hydroxide drying tube, the latter being unnecessary when dry ammonia is used. 

Steam is improperly is applied to a chlorine cylinder and an ammonia cylinder in separate incidents. 

Fig. 180. Simplified apparatus for the preparation of small amounts of anhydrous hydrazine Tj is connected to an aspirator Tg is connected to an ammonia cylinder ...

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