Cylinders sulfur dioxide

Chemica.1 Properties. Reviews of carbonyl sulfide chemistry are available (18,23,24). Carbonyl sulfide is a stable compound and can be stored under pressure ia steel cylinders as compressed gas ia equiUbrium with Hquid. At ca 600°C carbonyl sulfide disproportionates to carbon dioxide and carbon disulfide at ca 900°C it dissociates to carbon monoxide and sulfur. It bums with a blue flame to carbon dioxide and sulfur dioxide. Carbonyl sulfide reacts... 

Shipment and Storage. Liquid sulfur dioxide is commonly shipped in North America using 55- and 90-t tank cars, 20-ton tank tmcks, 1-ton cylinders, and 150-lb cylinders. Cylinders made of specified steel are affixed with the green label for nonflammable gases. The DOT classification is Poison Gas, Inhalation Ha2ard. Purchasers of tank-car quantities are required to have adequate storage faciUties for prompt transfer. 

It is convenient to condense sulfur dioxide from a cylinder in a calibrated trap cooled in a dry ice bath. 

It is best to use freshly prepared sodium sulfite for the reduction, since the commercial quality is poor and gives a lower yield of phenylhydrazine. A cylinder of liquid sulfur dioxide should, of course, be available. 

Movement of 1-ton chlorine/sulfur dioxide cylinders What if the cylinder is dropped from the lifting apparatus ... 

What if a chlorine/sulfur dioxide cylinder is delivered instead of sulfur dioxide/ chlorine ... 

What if liquid chlorine/sulfur dioxide is withdrawn through the vapor lines from the ton cylinder ... 

Sulfur dioxide was purchased from Matheson Gas Products. It is convenient to use sulfur dioxide contained in a lecture bottle so that the small cylinder can be mounted on a balance allowing continuous measurement of the weight of sulfur dioxide added. 

Fill A with well-activated charcoal to within 1 to 2 cm. of the overflow tube E. Immerse A in D and conduct in the two gases sulfur dioxide and chlorine, in equal volumes, best from cylinders of compressed gas. Action begins at once with considerable heat evolution, and after a time the union of the gases becomes almost quantitative. The flow of the two gases should be regulated so that the least number of bubbles escapes through the liquid collecting in A. Temperature is of... 

Alkyl Bromides General Discussion. When an alcohol is heated with aqueous 48 per cent hydrobromic acid, a partial conversion takes place into the corresponding bromide. The reaction is, however, more rapid and more complete in the presence of sulfuric acid. Although the constant boiling hydrobromic acid obtainable on the market may be used in all the above experiments, its preparation by the sulfur-dioxide reduction of bromine will be considerably cheaper and equally convenient, provided a cylinder of sulfur dioxide is available. For use in the preparation of alkyl bromides, distillation of the bromine-sulfur dioxide reduction mixture is superfluous. 

The checkers used anhydrous sulfur dioxide supplied in cylinders by the Matheson Co., Inc., East Rutherford, New Jersey, without further purification. Traces of moisture will not interfere with the reaction, and it is sufficient if the liquid sulfur dioxide is clear and colorless. If necessary, however, the gaseous sulfur dioxide may be dried with anhydrous calcium chloride before condensing it. 

Since liquid sulfur dioxide boils at -10.2°C the extraction can be conducted at atmospheric conditions. The liquid sulfurdioxide is obtained by cooling the gas from the cylinder using a Dry Ice acetone bath. When a coal liquid (usually in a waxy state) is treated with liquid sulfur dioxide, the insolubles remain with the minerals and the coal fragments as a solid residue. TheS02 Solu-bles are separated from the insolubles by filtration. The filtrate is... 

Pure sulfur dioxide is a colorless gas which has an irritating odor and which is soluble in water. The gas may be liquefied readily and is usually stored and transported in the liquid state in steel cylinders. 

Sulfur dioxide forms a colorless gas with a strong suffocating and irritating odor. The gas has a melting point of -72 Celsius, and a boiling point of-10 Celsius. The gas is easily condensed into a colorless liquid. The gas is soluble in water, alcohol, chloroform, and ether. Sulfur dioxide is available in gas cylinders, but it can be prepared in the lab by dripping hydrochloric acid onto excess sodium bisulfite. 

Sampling Samples of sulfur dioxide may be safely withdrawn from a tank or from transfer lines, either of which should be equipped with a 3/8-in. nozzle and valve. Samples should be placed in sample cylinders constructed of 316 stainless steel, designed to withstand 1000 psig and equipped with 316 stainless-steel needle valves on both ends. 

Sulfur dioxide and sulfites have long been used as preservatives, serving both as antimicrobial substance and as antioxidant. Their use as preservatives in wine dates back to Roman times. Sulfur dioxide is a gas that can be used in compressed form in cylinders. It is liquid under pressure of 3.4 atm and can be injected directly in liquids. It can also be used to prepare solutions in ice cold water. It dissolves to form sulfurous acid. Instead of sulfur dioxide solutions, a number of sulfites can be used (Table 11-2) because, when dissolved in water, they all yield active S02. 

In a 12-1. flask, equipped with a low-temperature thermometer and surrounded by an ice-salt bath, a solution of sulfurous acid is prepared by saturating 2.4 1. of water at 0-5° with sulfur dioxide from a cylinder. A brisk stream of the gas is continued (Note 2) while the cold diazonium salt solution is added in about 150-ml. portions over a 30-minute period and the temperature iS maintained at 5-10° the reaction mixture assumes a dark orange color (Note 3). The cooling bath is removed, but sulfur dioxide is passed into the mixture for an additional half hour. After the mixture has been allowed to stand for 12 hours at room temperature, 3 1. of concentrated hydrochloric acid (sp. gr. 1.18) is added the n-hydrazinobenzoic acid hydrochloride separates at once. The mixture is chilled to 0-5° and filtered through a precooled Biichner funnel the product is washed with two 50-ml. portions of ice-cold dilute (1 1) hydrochloric acid. The yield is 50-51 g. (86-88%) the salt melts at 194-195° with decomposition (Note 4) and is suitable for the next step without further purification (Note 5). 

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