| 摘要 |
1,134,439. Detecting organic sulphides. SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ N.V. 17 Oct., 1967 [19 Oct., 1966], No. 47314/67. Heading B1X [Also in Division G1] A reagent for detecting the presence of a saturated organic heterocyclic sulphide in a hydrocarbon, especially thiophane in a hydrocarbon comprises water dry, adsorptive, granular material impregnated with an acidic solution of an alkali metal iodate, a material for forming a colour with iodine and an organic sulphoxide and/or organic sulphone. The reagent solution is preferably formed from a solution of potassium iodate in glacial acetic acid and sulphuric acid the solution being mixed with starch solution, palladium chloride, mercuric iodide, distilled water, dimethyl sulphoxide and methylene blue. The reagent solution is added to silica gel and the mixture is heated in vacuum. The reagent is then packed in a glass tube 12 in zones 12a separated by zones 12b of purified sand. One end of the tube is connected to a balloon 14 whilst the other end is connected through a vapourising tube 10, a needle valve 5 and a valve 2 to a cylinder 1 of liquid hydrocarbon. Gas is passed through the tube 12 until the balloon, fits snugly within a standard volume ring 15. The zones 12a are then examined, each zone which has completely changed in colour from blue to green denoting a concentration of 10 p.p.m. by weight of thiophane. The palladium chloride stabilizes the final colour of the reagent. |
