Iodometric Back Titration Method for Hydrogen Sulfide Determination in Bitumen-Sulfur Mixtures

the most common method for determination of hydrogen sulfide content in the mixtures is iodometric back titration IBT method . In temperatures above 140 c bitumen -sulfur mixtures release some hydrogen sulfide gas . Bitumen and sulfur combine at a temperature above the melting point of the sulfur. part of the sulfur is chemically reacted with the bitumen and acts as an extender. sulfur reacts with hydrocarbons competitively , by adding to give carbon sulfur bonds , or abstraction of hydrogen and subsequent hydrogen sulfide formation . on cooling the mixture hydrogen sulfide can be emitted during the time from entrapped or dissolved gasses and makes personal safely & environmental restrictions. in this paper quantitative determinationof hydrogen sulfide , which is released by adding elementary sulfur into the hot mixing biturnen in various ratios and temperatures is studied . ammounium hydroxide is purged to the reaction mixture to expel hydrogen sulfide toward cadmium acetate solution to form cadmium sulfide. then hydrogen sulfide content of the mixture is determined by iodometric back titration method.

کلیدواژه ها:

sulfur ، hydrogen sulfide ، back titration ، iodometric