Boron trichloride cylinders

A 5-1. three-necked flask is fitted with a stirrer (which may be of the glass-sleeve type lubricated with paraffin oil, or a mercury-sealed Hirshberg stirrer), an efficient condenser fitted with a calcium chloride drying tube, and a gas inlet tube. The gas inlet tube is connected with polyethylene tubing through a small bubble counter containing a nonvolatile hydrocarbon to the cylinder of boron trichloride. 

Two liters of toluene are added to the reaction flask and the boron trichloride cylinder is placed on a balance. The reaction flask is then cooled with a Dry Ice-ethanol or Dry Ice-acetone mixture. The gas cylinder valve is opened, and the boron trichloride is condensed in the toluene. After 117 g. (1 mol) of boron trichloride has been introduced, the cylinder valve is... 

Boron trichloride is a colorless, acid gas that fumes in the presence of moist air. It is packaged in steel cylinders as a liquid under its own vapor pressure of 19.1 psia (132 kPa, abs) at... 

The valve protection cap should remain in place unless the container is secured with the valve outlet piped to the point of use. Do not heat the cylinder by any means to increase the discharge rate. Keep the system scrupulously dry. In the presence of trace amounts of water, boron trichloride forms hydrochloric acid. Hydrochloric acid is very corrosive to most common materials of construction. Systems should be purged with a dry inert gas before and after use. 

Disposal of boron trichloride may be accomplished by slowly discharging the gas into a countercurrent flow scrubber or other suitable receptacle containing approximately 15 percent sodium hydroxide or other alkali and water. It is necessary to use a vacuum break or reverse flow trap to prevent the caustic solution fi om drawing back into the system or cylinder. 

Boron trichloride leaks are easily detected by the presence of fuming vapors. Systems should be vented and purged with inert gas before making repairs. If a leak is in the cylinder or cylinder valve, the supplier should be contacted... 

Boron trichloride is shipped as a compressed liquefied gas under its own vapor pressure (19.1 psia at 70°F or 132 kPa, abs at 21.1°C) in cylinders and tank cars. 

Boron trichloride is approved for filling in specification steel or nickel cylinders as pre-... 

Basically all methods of preparation of boron trifluoride entail the reaction of a boron compound with a fluorine containing compound in the presence of an acid. In one major method of commercial preparation, boron trifluoride is produced from boric oxide and hydrofluoric acid (in the reaction B2O3 + 6HF -> 2BF3 + 3H2O) the product is purified and compressed before packaging in cylinders. Other methods of manufacture employ reactions between boron trichloride or boric and hydrofluoric acid. 

Boron trichloride should be stored in a cool, dry, well-ventilated area. Cylinders should be firmly secured and protected from damage. Full and empty cylinders should be stored separately. Inventory should be rotated to prevent prolonged storage of a full cylinder. The temperature in the storage area should not exceed 125 F (51.7°C). Personnel... 

The Type CG-2 fusible plug is the authorized pressure relief device for cylinders of boron trichloride. It has a nominal yield temperature of 165°F (73.9°C). For additional information, see CGA S-1.1, Pressure Relief Device Standards—Part I—Cylinders for Compressed Gases, [5]... 

The standard valve outlet connection in the United States and Canada for boron trichloride cylinders is Connection CGA 660. [6]... 

The safety advantages of these devices can be seen in the release rates of a compressed gas from cylinders under pressure. The orifice is an effective, inexpensive, and easy to use safety device which should be used more often to mitigate the consequences of catastrophic gas release. Almost all compressed gases, with the exception of low vapor pressure materials, such as chlorine and boron trichloride, may be used successfully with a limiting orifice. 

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