Reducing the environmental impact of offshore H2S scavenging wastewater via hydrothermal oxidation

Multifunctional biomass-based chemicals: H2S scavenging

“…However, due to the high concentration of moderately toxic chemicals, its Environmental Impact Factor is estimated to be between 10% and 20% of the total discharge into the sea of offshore oil and gas installations. 11 Due to the high impact of the discharge into the marine compartment, it is important to assess the potential environmental impacts of alternative solutions before further development. In this work, we present our findings on synthesizing and assessing environmental impacts at the design level for conceptually new biomass-based multivalent chemicals exemplified by H 2 S scavengers.…”

Temperature- and pH-Dependent Kinetics of the Aqueous Phase Hydrogen Sulfide Scavenging Reactions with MEA-Triazine

“…Despite the widespread use of MEA-triazine, the kinetics governing the H 2 S scavenging reactions with HET (the scavenger) in the aqueous phase are still poorly understood. This is considered one of the main reasons for the large excess of scavenger utilized in offshore practice, which leads to high costs for the operators and unnecessary discharge into the sea of unreacted HET in the spent H 2 S scavenger wastewaters. , A better understanding of the kinetics of the scavenging reactions will allow a better design of the process with a smaller consumption of MEA-triazine for a given H 2 S abatement specification, hence reducing both operating costs and environmental impact.…”

Kinetics of the Scavenging Reactions of Hydrogen Sulfide with MEA-triazine

“…Based on the injection point of the scavenger shown in Figure 2-6, the H 2 S scavenging process of gas streams by injection of liquid scavengers in offshore oil and gas platforms takes place in a broad temperature range, from ambient up to 160°C. Furthermore, considering the typical pH values of commercial aqueous solutions of MEA-triazine (~10.5 -11.0) and the reported pH values of spent scavenger streams being around 8.9 -9.4 [15,17,46], it is fair to conclude that the pH of the aqueous phase dispersed in the gas stream is in the range 9.0 -11.0.…”