Mercaptan mixture, liquid

Mercaptan Mixture, liquid, flammable, toxic, n.o.s. 1228 28 Mercury Cyanide 1636 53... 

Mercaptans and Mixtures, liquid. 1228 28 Mercury Potassium Iodide 1643 53... 

The LPG stream containing a mixture of C s and C4 s must be treated to remove hydrogen sulfide and mercaptan. This produces a noncorrosive, less odorous, and less hazardous product. The C s and C4 s from the debutanizer accumulator flow to the bottom of the H S contactor. The operation of this contactor is similar to that of the fuel gas absorber, except that this is a liquid-liquid contactor. 

In recent studies, a new line of PGM collectors had been developed [13] known as the PM series. These collectors are an ester-modified mixture of xanthate + mercaptan. The reaction product forms an oily greenish-coloured liquid. The results obtained using the PM series of collectors are shown in Table 18.5. High PGM recovery was obtained using a combination of sodium amyl xanthate plus collector PM301. 

The submitter used methanethiol (b.p. 8°) obtained from Matheson Gas Products. The weight of the methanethiol distilled from the lecture bottle into the reaction flask was measured by difference. The pungent odor of this mercaptan is minimized by slow distillation of the reagent into the flask and by the use of a well-ventilated hood. The checkers used methanethiol (b.p. 8°, d 0.8948) obtained from Toyo Chemical Industries Co. (Japan) and changed the above procedure as follows methanethiol distilled from the lecture bottle was first trapped in an ice-cooled graduated flask equipped with a gas inlet and a dry ice reflux condenser, then 56 ml. of the liquid was redistilled into the reaction mixture. 

Forty-three grams (1.0 mole) of ethyleneimine (p. 153) (Caution— volatile and toxic substance) is placed in a flask equipped with a reflux condenser. The reaction mixture is held at 60° by external cooling while a stream of hydrogen sulfide is introduced. After there is no evolution of heat upon introduction of hydrogen sulfide (about 50 minutes), the liquid, viscous reaction mixture is dissolved in 1.25 times its volume of absolute ethanol and cooled overnight in the refrigerator. The precipitated /S-aminoethyl mercaptan (5.6 g.) is filtered off, and the ethanol is evaporated from the filtrate under reduced pressure. The residual liquid is distilled under reduced pressure, and 4.9 g. additional /ff-aminoethyl mercaptan sublimes during the first part of the distillation. Bis-2-aminoethyl sulfide is collected at 130-131 °/22 m. There is obtained 29.8 g., or a 50% yield. 

A cloudy mixture of 20 g. (0.32 mole) of ethyl mercaptan and 12 g. (0.16 mole) of ethyl formate is cooled in an ice-salt bath while dry hydrogen chloride is introduced until the mixture becomes saturated. Hood.) On the introduction of the hydrogen chloride, the mixture becomes clear for a while, after which the water formed in the reaction causes reappearance of a second liquid phase. After several hours the reaction mixture is washed with water and the oily layer is removed by extraction with ether. After drying over calcium chloride, the ether layer is distilled to give 16 g. of ethyl orthothioformate, b.p. 133°/21 mm. The yield is 82% based on ethyl mercaptan. 

A mixture of 51 g. (0.5 mole) of n-hexyl alcohol, 38 g. (0.5 mole) of thiourea, and 256 g. (1.5 moles) of 48% hydrobromic acid is stirred and heated to reflux for 9 hours. A solution of 60 g. (1.5 moles) of sodium hydroxide in 600 ml. of water is added, and the resulting mixture is heated under reflux for 2 hours, without stirring and with a stream of nitrogen passing over the surface of the liquid. The layers are separated, and the aqueous layer is acidified and extracted with ether. The combined ethereal extracts are dried over anhydrous calcium sulfate and distilled through a 12-in. packed column. n-Hexyl mercaptan is obtained in 71% yield. It boils at 149-152° at atmospheric pressure. 

Dimethylarsenious sulphide, Cacodyl sulphide, [(CH3)gAs]jS, is most readily obtained by adding the calculated quantity of sulphur to dimcthylarsine. It is also formed when hydrogen sulphide is passed into an aqueous solution of cacodylic acid, or by distilling a mixture of barium hydrosulphide and cacodyl chloride in a carbon dioxide atmo-.sphcrc. Dimethylarsenious sulphide is a transparent, non-fuming liquid, having a most disagreeable odour, like that of mercaptan. It does not solidify at —40 C., is volatile in steam, aitd boils above 100 C. It inflames in air, is miscible in all proportions with alcohol and ether, and is insoluble in water. When treated with copper nitrate in... 

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