胜利和孤岛减压渣油中的硫醚硫和噻吩硫的测定

用ＫＩＯ３电位滴定法测定了胜利和孤岛减压渣油及其色谱分离组分中的硫醚硫，用管式炉定硫法测总硫量，差减得到噻吩类硫的含量。对胜利和孤岛渣油及其亚组分的测定结果表明，胜利减压渣油中的硫约有３６．６％为硫醚硫，６３．４％为噻吩硫；孤岛减压渣油的相应值分别为４０．１％和５９．９％；胜利减渣的芳香分中硫醚硫含量高于其胶质中的硫醚硫含量，且相差较大；而孤岛减渣的这两个组分中的硫醚硫含量相近。硫醚硫在这两个渣油

DETERMINATION OF SULFIDIC AND THIOPHENIC SULFUR IN SHENGL AND GUDAO VACUUM RESIDUES

A potentiometric titration method with KlO_3 as a titrant was tried and modifiedto determine the sulfidic sulfur in Shengli and Gudao vacuum residues.Titration endpointswere determined bv differential treatment of the titration curves or by an experience obtainedfrom a series of tests.The experimental results showed that the modifed method was provedto be a useful tool for quantification of sulfidic sulfur in streight-run vacuum residues.Con-sequently, the contents of sulfidic sulfur in Shengli and Gudao vacuum residues and theirchromatographied fractions were measured by the method. Sulfidic sulfur in Shengli and Gu-dao vacuum residues are about 36.6%and 40.1%of their total sulfur respectively; with thetrend to heavier fractions,sulfidic sulfur gradually decreases,but thiophenic sulfur increas-es;the sulfur in asphaltenes is almost thiophenic sulfur.