Determination of acetylene and vinyl chloride in hydrochloric acid from producing vinyl chloride by headspace gas chromatography

A headspace gas chromatographic method was used for determining acetylene and vinyl chloride in hydrochloric acid from vinyl chloride production. Hydrogen chloride was neutralized by sodium hydroxide, so its effect on determining acetylene and vinyl chloride was eliminated. The headspace bottle was put in a water bath at 35 ℃ for 45 min. The GC column was a 2 m×3 mm i d stainless steel tube packed with GDX 202 stationary phase. The column temperature was 140 ℃. Injection volume was 1 mL. External standard method was used for quantitation. The relative standard deviation was 0 85% and the recoveries in the range of 30 0 μg/g-150 μg/g were 98 9%-103% for acetylene. The relative standard deviation was 1 4% and the recoveries in the range of 20 0 μg/g-100 μg/g were 98 8%-102% for vinyl chloride.