In response to expanding requests towards natural gas usage as a key energy source and vital feedstock, revamping current gas refineries to provide additional capacity and meet the sustainability limitations is considered a crucial essence. In this work, the behavior of a gas refinery after switching its amine solution from diethanolamine to methyldiethanolamine was evaluated. The plant's main goals by this change, i.e., increase sweetening capacity and lowering energy consumption intensity was fulfilled. However, after some overhaul services, the hydrogen sulfide content of final treated gas raised from permissible limit, i.e., 3 ppm at least for three initial months of operation, and then progressively reduced to around 2 ppm. Systematic investigation of plant data shows that carbonyl sulfide hydrolysis in the dehumidification section as downstream of the sweetening section would increase the hydrogen sulfide content of the treated stream. Meanwhile, the gradual formation of heat stable amine salts in amine solution promotes its absorption capacity, which can counterpoise the effect of further hydrogen sulfide generation due to carbonyl sulfide hydrolysis in the subsequent section. Monitoring heat stable amine salts concentration in amine solution suggests that there should be a minimum level of 0.25 wt.% of these compounds to achieve suitable hydrogen sulfide content in final treated gas.

为了响应将天然气用作关键能源和重要原料的需求不断扩大，改造当前的天然气精炼厂以提供额外的产能并满足可持续性限制被认为是至关重要的本质。在这项工作中，评估了将其胺溶液从二乙醇胺转换为甲基二乙醇胺后的气体精炼厂的行为。通过这种改变，该工厂的主要目标，即提高脱硫能力和降低能源消耗强度得以实现。然而，经过一些大修服务后，最终处理后的气体的硫化氢含量从允许的限值上升，即在运行的最初三个月至少为 3 ppm，然后逐渐降低到 2 ppm 左右。对工厂数据的系统调查表明，在脱硫段下游的除湿段中的硫化羰水解会增加处理后物流的硫化氢含量。同时，在胺溶液中逐渐形成热稳定的胺盐促进了其吸收能力，这可以抵消后续部分由于羰基硫水解进一步产生硫化氢的影响。监测胺溶液中的热稳定胺盐浓度表明，这些化合物的最低含量应为 0.25 wt.%，以在最终处理的气体中达到合适的硫化氢含量。在胺溶液中逐渐形成热稳定的胺盐促进了其吸收能力，这可以抵消后续部分由于羰基硫水解进一步产生硫化氢的影响。监测胺溶液中的热稳定胺盐浓度表明，这些化合物的最低含量应为 0.25 wt.%，以在最终处理的气体中达到合适的硫化氢含量。在胺溶液中逐渐形成热稳定的胺盐促进了其吸收能力，这可以抵消后续部分由于羰基硫水解进一步产生硫化氢的影响。监测胺溶液中的热稳定胺盐浓度表明，这些化合物的最低含量应为 0.25 wt.%，以在最终处理的气体中达到合适的硫化氢含量。