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Random packing height (m)
MDEA strength (wt%)
CO slip %
H S recovered %
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CO slip %
H S recovered %
H S in vent ppm
Figure 2 Impact of absorber height on TGTU performance
Figure 3 Impact of MDEA strength on TGTU performance
of more CO₂ also being co-absorbed (the CO₂-slip trend also moving downwards). Therefore, a tower that is ideally not too short and not too tall is preferred for such a unique enrichment application. For this case, a trade-off at around six to eight metres gives the best results. v Amine chemistry MDEA is a commonly available tertiary amine that offers many advantages over other alkanolamines. Additionally, as a slow-reactive amine, MDEA is effective for selectively remov- ing H₂S over CO₂ compared to faster-reactive alternatives ,
such as DEA and MEA. MDEA is also less corrosive than DEA and MEA, so it can be used in concentrations up to 50 wt%. However, in TGTU applications, where one is trying to prevent CO₂ co-absorption, lower MDEA strengths may be preferred. As seen in Figure 3 , a 20-30 wt% MDEA gives the best CO₂ slippage and optimum H₂S absorption. Going lower than 20 wt% can result in the unit being too close to a ‘cliff’, resulting in insufficient H₂S removal (due to too little amine available) and a sudden spike in the H₂S concentration in the vent line (thereby resulting in failure to meet the SOx emission specifications).
Selecting the best catalyst is a vital step to maximizing your unit’s performance and profitability within your refinery. Benchmark Catalyst Options Before Your Next Changeout Avantium’s refinery catalyst testing improves catalyst selection with validated and cost-effective testing protocols tailored for your unit, your feed, and your conditions.
Naphtha Reforming Hydrotreating FCC Pretreat Hydrocracking Isomerization Dewaxing
100+ 16 92% Tests performed Catalysts side-by-side Average customer rating
Your Feed Your Conditions
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