H2S scavenging

The H2S scavenging technology is used for the removal of small amounts of H2S (typically less than 500 ppm) from gas or liquid in the pipeline to a pipe specification (2,5 ppm). The technology (with pertinent chemistry) can also be used for the removal of trace components in the gas such as Mercaptans and Mercury as well injecting different types of production chemicals into the pipeline, e.g scale inhibitors, corrosion inhibitors, hydrate inhibitors, drag reducers.

The ProPure mixer can also be used as a wet gas metering system where the gas flow rate also can facilitate automatic regulation of the amount of scavenger supplied. The ProPure mixer is delivered for pipe sizes ranging from 2" to 24", but can also be produced to be implemented in even bigger pipes.

The H2S scavenging process is delivered to over 30 applications internationally.

Special features of the product are the following :

• 30-35 % reduced scavenger consumption compared to conventional technology
• Reduced environmental impact
• High gas- and liquid turn-down ratio
• Robust towards clogging
• Can be easily installed at any angle
• Can be used as wet gas metering system
• Extend range of H2S scavenging with a factor of 3 (typically about 300 ppm H2S)

Selective H2S removal

ProPure has developed a novel co-current contacting technology that improves the H2S selectivity in comparison to conventional technology. With the high selectivity towards H2S obtained in the ProPure contactor, the loading capacity for H2S will increase and the circulation rate in the process plant can be reduced.

With a single stage, the Compact Alkanolamine Process (CAP) technology can be used for the removal of H2S up to 50 ppm with any amount of CO2 , preferably higher than 1 %. With a two stage process the H2S level can be increased to 500 ppm with only marginal reduction of selectivity. A 3-stage process will typically handle up to 2% H2S for any concentration of CO2 . The CAP is undergoing field testing at the pilot plant in Chemery, south of Paris.

Special features of CAP system are the following:

• Reduction in circulation rate
• Reduced environmental impact
• Compact process with in-line absorption
• High gas- and liquid turn-down ratio
• Less foaming problems
• Contactors can be easily installed at any pipe inclination