Asbestos clothing

The efficiency of all the above columns (and also those described below) is increased by lagging with asbestos cloth. The best results are obtained by surrounding each column with two glass jackets and heating the inner jacket electrically to a temperature within 5-10° of the fraction... 

Trimethylene Di-iodide. Use 76 g. of trimethylene glycol, 27 - 52 g. of pmified red phosphorus and 254 g. of iodine. Lag the arm C (Fig. Ill, 40, ) with asbestos cloth. Stop the heating immediately all the iodine has been transferred to the fiask. Add water to the reaction mixture, decolourise with a httle sodium bisulphite, filter, separate the crude iodide, wash it twice with water, dry with anhydrous potassium carbonate and distU under reduced pressure. B.p. 88-89°/6 mm. Yield 218 g. (a colourless liquid). 

The best results are obtained b distillation from a small flask through a short fractionating column a Hempel column tilled with glass rings (Fig. 11,16, 1) and lagged with asbestos cloth or several thicknesses of linen cloth is quite satisfactory. 

Place 150 g. of benzoic acid, 150 g. (139 ml.) of acetic anhydride and 0-2 ml. of syrupy phosphoric acid in a 500 ml. bolt-head flask. Fit the latter with a two-holed stopper carrying a dropping funnel and an efficient fractionating column (compare Fig. 7/7, 61, 1) it is advisable to lag the latter with asbestos cloth. Set up the flask in an oil bath or in a fusible metal bath. Distil the mixture very slowly and at such a rate that the temperature of the vapour at the head of the column does... 

A modified Hahn condenser, a form of partial condenser, is illustrated in Fig. VI, 12, 1 it is best constructed of Pyrex glass. The dimensions given are only approximate and may be varied slightly. The inside clearance should be approximately 0-3 cm. a water jacket should be fitted over the central portion of the side arm by moans of rubber stoppers. Alternatively, the side arm may have a length of about 10 cm. and a condenser fitted to this in the usual manner. An approximately 1 cm. layer of absolute alcohol is placed in the inner condensing tube and the top of the tube is connected to a reflux condenser. The outside of the condenser below the side arm should be insulated with asbestos cloth or paper. The refluxing mixture boils the ethyl alcohol in the inner tube, most of the isopropyl alcohol is returned to the flask and the acetone distils over. 

The following alternative procedure is recommended and it possesses the advantage that the same tube may be used for many sodium fusions. Support a Pyrex test tube (150 X 12 mm.) vertically in a clamp lined with asbestos cloth or with sheet cork. Place a cube (ca. 4 mm. side = 0 04 g.) of freshly cut sodium in the tube and heat the latter imtil the sodium vapour rises 4 5 cm. in the test-tube. Drop a small amount (about 0-05 g.) of the substance, preferably portionwise, directly into the sodium vapour CAUTION there may be a slight explosion) then heat the tube to redness for about 1 minute. Allow the test tube to cool, add 3-4 ml. of methyl alcohol to decompose any unreacted sodium, then halffill the tube with distilled water and boil gently for a few minutes. Filter and use the clear, colourless filtrate for the various tests detailed below. Keep the test-tube for sodium fusions it will usually become discoloured and should be cleaned from time to time with a little scouring powder. 

Alternatively, an independent column (Fig. XII, 2, 8, c) may be inserted into a flask the column may be of the Vigreux, Widmer or Hempel form. The fractionating column should be lagged with asbestos cloth or string for distillation temperatures above 100° for the best results the column should be heated electrically (compare Section 11,15) to a temperature 5-10° below the b.p. of the fraction being collected. The side arm of the flask or fractionating column may be attached to a cold spot condenser and receiver as in Fig. XII, 2, 4 or to a Liebig s condenser and receiver as in Fig. XII, 2, 1. 

Chemical Reactivity - Reactivity with Water No reaction Reactivity with Common Materials Can catch fire when in contact with porous materials such as wood, asbestos, cloth, soil, or rusty metals Stability During Transport Stable at ordinary temperatures, however when heated this material can decompose to nitrogen and ammonia gases. The decomposition is not generally hazardous unless it occurs in confined spaces Neutralizing Agents for Acids and Caustics Flush with water and neutralize the resulting solution with calcium hypochlorite Polymerization Not pertinent Inhibitor of Polymerization Not pertinent. 

Asbest-aufschlkmmung, /. asbestos suspension -drahtnetz, n. asbestos wire gauze, -faser, /. asbestos fiber. -filz,m. asbestos felt. -flocken f.pl. asbestos flocks, asbestos wool, -gewebe, n. asbestos cloth, -handschuh, m. asbestos glove, -holz, n. asbestos lumber, -luftbad, n. asbestos air bath, -oUtb, n, short-fibered asbestos, -papier, n. asbestos paper, -pappe,/. asbestos board, -platte, /. asbestos plate or board, -schale, /. asbestos dish, -schicht, /. asbestos layer or bed. -schlefer, m. asbestos alate. -schirm, m. asbestos screen, -schnur, /, asbestos twine or cord, -schurz, m -schurze, /, asbestos apron. -woUe, /. asbestos wool. 

In each plate there are three holes, one at X and VO along the line AB, so that, when the plates are laced together, the enclosed recess could be filled with ater by means of the hole X. A small hole com-lunicates with recess and the holes on AB, but in the ise of one this communication is on the right-hand side hile on the other it is on the left. Now, between any VO plates is placed a partition, the shape and holes in hich exactly coincide with those in the plates. The ige of this partition is composed of rubber, while the Jntre portion, which is of the same size as the recess in le plate, is made of asbestos cloth. 

Linum vivum Ancient name for cloth woven from asbestos. From the Latin linum, meaning flax or linen, and vivum, used in the sense of to endure or to live, in reference to the stability of asbestos cloth against fire. 

Asbestos has been known and used for over 2000 years. Egyptians used asbestos cloth to prepare bodies for burial. The Romans called it aminatus and used it as a cremation cloth and for lamp wicks. Marco Polo described its use in the preparation of fire-resistant textiles in the... 

Rather violent foaming may occur during this distillation but is easily controlled in a 250-ml. flask. The distilling head and flask may be wrapped in asbestos cloth in order to increase the speed of distillation. 

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