Refinery Gas Analysis (RGA) With Sulfur Selective Detection

Analyzer Description

6-valve, packed and capillary columns, fused silica tubing, TCD / TCD / FID / SCD
Sample type:
Natural gas, sour gas, other refinery gases
Components separated:
C1 – C7, hydrogen, carbon dioxide, hydrogen sulfide, oxygen, nitrogen, carbon monoxide, carbonyl sulfide, sulfur dioxide, methyl mercaptan, ethyl mercaptan, dimethyl sulfide, carbon disulfide, isopropyl mercaptan, t-butyl mercaptan, n-propyl mercaptan, ethyl methyl sulfide, thiophene, 2-butyl mercaptan, isobutyl mercaptan, diethyl sulfide, n-butyl mercaptan, dimethyl disulfide, 2-methylthiophene, 3-methyl thiophene, diethyl disulfide
Lower detection limits:
20 ppm for hydrocarbons, 100 ppm for permanent gases, 500 ppm for H2S on the TCD, 50 ppb for all sulfur compounds using the SCD
Methods met:
ASTM D1945, ASTM D1946, ASTM D7833, UOP 539, Wasson-ECE 383D-SCD, W2639

Typical Chromatogram

Key Features and Benefits

  • The trace sulfur analysis is performed at the same time as the other analyses
  • The backflush peak can be tailored to specific samples (e.g. C6+ or C8+ backflush composite peaks)
  • Fused silica lined system eliminates trace sulfur reactions during injection

Refinery Gas Literature (PDF)