The article discusses methods for recovering sulfur from gases with low hydrogen sulfide levels. The Recycle Selectox process helps maintain stable conditions even with fluctuating gas feed. For gases with very low hydrogen sulfide, the Stretford or Unisulf process is recommended. The Recycle Selectox process is advantageous for weak acid gas feeds, especially below 30% hydrogen sulfide concentration. The Claus process can handle sulfur conversion from gases with at least 30% hydrogen sulfide. Simple modifications to the Claus process can convert hydrogen sulfide to sulfur in gases with as low as 30% hydrogen sulfide concentration.