High sulphur recovery at low cost with SmartSulf™

Process Principle: Thermal stage: acid gases are burnt with air to produce sulphur at high temperature thanks to Claus reaction. COS and CS2 hydrolysis: COS and CS2 from the process gases are hydrolyzed at high temperature in the first zone of the SmartSulf™ reactor operating in hot mode. Claus Reaction: Claus reaction occurs in the second zone of the hot mode SmartSulf™ reactor, where heat of reaction is continuously removed by thermoplates internals, thus increasing sulphur conversion.

Subdewpoint Claus reaction: Claus reaction plus further COS conversion is performed in the cold mode SmartSulf™ reactor operating below sulphur dewpoint producing liquid sulphur which is trapped on catalyst. Cycle switch: when cold mode SmartSulf™ reactor is saturated with liquid sulphur, a switch between hot and cold mode is performed automatically by rotating the two coupled 4 way valves, enabling the beginning of a new cycle.

SmartSulf™ Benefits
• Performance above 99.5% sulphur recovery
• Complete COS and CS2 destruction at high temperature
• Proven technology, successfully operating in commercial plants since 1995
• Very low capital cost
• Low operation cost: process is fully automatic and needs nearly no follow-up
• Use of conventional open market Claus catalysts
• Easy retrofit to upgrade existing Claus units into SmartSulf™


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