Journal of the Chemical Society 1900/I. [antikvár]

JOURNAL OF THE CHEMICAL SOCIETY. ABSTRACTS OF CHEMICAL PAPERS PUBLISHED IN BRITISH AND FOREIGN JOURNALS. PART I. Organic Chemistry, Purification of Acetylene. By Fritz Ullmann and Irma Goldberg {Ghem. Centr., 1899, ii, 19—20, from J. Gashel, 42, 374—377).—The phosphorus and sulphur iu samples of acetylene which had been purified by various methods were estimated by Lunge and Cedercreutz's method (Abstr., 1898, ii, 54). The results showed that ferric and chromic salts have no purifying effect on crude acetylene, and that whilst cuprous chloride removes hydrogen phosphide but not organic sulphur compounds, chromic acid absorbs, not only the phosphorus compounds, but also almost all those containing sulphur. The chromic acid contained in the solution used for purifying acetylene is estimated as follows. 25 grams are boiled with 100 c.c. of a 5 per cent, sodium hydroxide solution, the cooled liquid made up to a litre, and 50 c.c. then treated with 8 c.c. of a 10 per cent, solution of potassium iodide, together with about 18 c.c. of a 20 per cent, solution of hj'drochloric acid, 200 c.c. of water, and a slight excess of sodium thiosulphate solution. The excess of thiosulphate is titrated with iodine solution. The results obtained show that pure acetylene is not attacked by the chromic acid solution and that the amount of solution required for purifying the gas is dependent on the quantity of gas to be treated and amount of impurity it contains. E. W. W. The Heating of, and Evolution of Chlorine from, Bleaching Powder Purifiers for Acetylene. By Felix B. Ahrens {Zeit. angew. Chem., 1899, 777—779).—When a mixture of bleaching powder and sawdust is employed to remove the sulphur and phos VOL. LXXVIII. i. h