Chlorine cylinder connection

After changing a chlorine cylinder, two workers opened the valves to make sure there were no leaks on the connecting pipework. They did not expect to find any, so they did not wear air masks. Unfortunately there were some small leaks, and they were affected by the chlorine. 

A. Preparation of trane-S,3-dieb.loro-l,4-dioxane (Note 1). To a 2-L, three-necked, round-bottomed flask, equipped with two inlet tubes (with sintered-glass diffusers at the end) connected to a chlorine cylinder, and a... 

Preparation of Antimony Trifluorodichloride (SbF3Cl2). This is made in the steel reaction vessel, described on p. 59. A known quantity of antimony fluoride is placed in the vessel the vessel is evacuated, the needle valve is closed, and the whole is weighed. Connection is established to a chlorine cylinder, and the needle valve is opened to permit qhlorine to fill the vessel. Part of it is absorbed rapidly by the salt, with evolution of heat. Soon the reaction slows down as indicated by the rate of pressure fall when the needle valve is dosed. Weighing indicates the amount of chlorine present in the vessel. When the absorption practically ceases, the valve is closed, and the connection with the chlorine tank is removed. The reaction vessel is alternately heated gently, then allowed to cool in order to permit SbFsCl2, which is a viscous liquid, to flow and expose fresh surfaces of crystalline antimony trifluoride. The operation is ended after the absorption of the desired quantity of chlorine. 

The S3N2CI2 is prepared according to Part A. After the volatile impurities have been removed, dry air is allowed to enter the air condenser. The bottom of the condenser is then connected to a 150-ml. round-bottomed three-necked flask fitted with an inlet tube for chlorine and a vacuum connection (Fig. 6). The vacuum connection on top of the air condenser is replaced with a drying tube containing anhydrous calcium sulfate. The assembly is placed in a hood the inlet tube is connected to a chlorine cylinder, and a slow stream of chlorine is passed through the air condenser over the S3N2CI2. Soon after the start of the chlorine flow, the S3N2CI2 turns into a dark red-brown slurry, which falls... 

No chlorine gas 2a. Chlorine cylinders 2a. Visual inspection. 2a. Connect cylinders or replace empty... 

The standard valve outlet connection for chlorine cylinders in the United States and Canada is Connection CGA 820. The limited... 

A satisfactory way to accomplish the introduction of chlorine with minimal loss of the gas is to seal the reaction flask with a two-holed stopper equipped with a gas-inlet tube reaching just above the surface of the reaction mixture and an exit tube connected to a U-tube filled with mineral oil which is used as a gas-flow indicator. Chlorine is then introduced from the cylinder through a safety trap at such a rate as to maintain a small positive pressure in the reaction flask. 

Never connect the cylinder directly to vessels of liquid since suck-back into the cylinder may result in violent reaction. Insert a trap in the line between the chlorine supply and the receiver of sufficient capacity to accommodate all the liquid. 

A network of chlorine detectors is positioned at points close to potential leak sources (such as close to the chlorine vaporiser, compressor flanges and drum, cylinder and tanker filling connections) as well as along the perimeter of the site. Many chlorine detectors are interconnected with automatic plant responses and initiation of chlorine scrubbing where a chlorine release occurs within a contained building. 

The receiver containing the ethereal solution of trimethyl-stibine is kept in ice, and the stopper is replaced with a gas inlet tube connected to a cylinder of chlorine. The inlet tube should extend at least 2 cm. below the level of the liquid in the flask. The mixture is stirred slowly and chlorine is bubbled in until the slurry turns yellowish in color. The precipitate of trimethylantimony dichloride which has formed during the chlorination is removed by filtration on a fritted Buchner funnel and washed several times with ethyl ether. The yield of crude product is 95.9 g. (64.2% of theoretical based upon SbCls). 

Place in the flask 12 g of red phosphorus and 300 g of glacial acetic acid. Insert a thermometer and the delivery tube, and heat to about 100°. Chlorine is obtained from a cylinder which is connected first to a filter flask, which acts as a trap, and then to the disperser. Rubber tubing (red) of 5 mm in diameter is used to make the connections between the filter flask and the disperser. Open the main valve of the cylinder first, making about one quarter turn, and then, very slowly, open the needle valve. Adjust the latter so a fine stream of bubbles issues through the disperser. Pass chlorine into the mixture slowly at first and increase the flow gradually. The flame is adjusted so that the heat from the reaction is sufficient to keep the temperature at 105-110°. Chlorine is passed into the mixture until the contents of the flask have gained about 150 g (85 per cent of theory) in weight. The time required is about nine hours. After six hours it is necessary to reduce the flow of chlorine. 

Low chlorine gas la. Insufficient number of la. Reduce feed rate and la. Connect enough cylinders to the system... 

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