DEVELOPMENT OF A GAS DETECTOR TUBE TO MEA SURE DIMETHYLSULFIDE IN CITY GAS BASED ON LIQUEFIED NATURAL-GAS

The odorant blend of tertiary butylmercaptan (TBM) and dimethylsulfide (DMS) is generally used as an odorant in city gas based on liquefied natural gas. The concentrations of both TBM and DMS in city gas are ab out 2 volppm. To control the quality of city pas, a simple method is r equired to determine the odorant concentration at the end of pas pipel ines. This paper reports on the development of a gas detector tube whi ch can measure the DMS concentration in city gas. The principle of col oration is the oxidation of DMS by KMnO4. The DMS concentration in cit y gas is determined by a newly developed gas detector tube conected to a TBM gas detector tube. The determination range at 293 K was 0.8-8.2 volppm when the test gas volume was 100 mi. The repeatability of meas urements was within +/- 10% as a relative standard deviation.