The process of biogas upgrading with ionic liquids, i.e. pure 1-butyl-3-methylimidazolium bis(trifluoro-methylsulfonyl)imide ([bmim][Tf₂N]), aqueous choline chloride/urea (ChCl/Urea), and aqueous 1-allyl-3-methyl imidazole formate ([Amim][HCOO]), was simulated in Aspen Plus and compared with the conventional water scrubbing upgrading technique. The comparisons of the performances on the amount of recirculated solvents and energy usage show the following order: aqueous [Amim][HCOO] < aqueous ChCl/Urea < [bmim][Tf₂N] < water. Six different co-digestion plants (anaerobic digestion, AD, plants) were surveyed to acquire data for comparison. The selected plants had different raw biogas production capacities and produced gas with differing methane content. The data confirmed the simulation results that the type of substrate and the configuration of AD process are two factors affecting energy usage, investment cost, as well as operation and maintenance costs for the subsequent biogas upgrading. In addition, the simulation indicated that the energy usage of the ionic liquid-based upgrading was lower than that of the conventional upgrading techniques in Scandinavian AD plants. The estimated cost including investment, operation and maintenance for the ionic liquid technology showed to be lower than that for the water scrubbing upgrading process.

用离子液体（即纯的1-丁基-3-甲基咪唑双（三氟-甲基磺酰基）酰亚胺（[bmim] [Tf ₂ N]），氯化胆碱/尿素水溶液（ChCl /尿素）和水溶液1）净化沼气的过程在Aspen Plus中模拟了甲酸-烯丙基3-甲基咪唑甲酸酯（[Amim] [HCOO]），并将其与常规水洗提纯技术进行了比较。对再循环溶剂量和能源使用量的性能比较显示以下顺序：[Amim] [HCOO]水溶液<ChCl水溶液/尿素<[bmim] [Tf ₂N] <水。对六种不同的共消化植物（厌氧消化，AD，植物）进行了调查，以获取数据进行比较。选定的工厂具有不同的原始沼气生产能力，并且产生的沼气具有不同的甲烷含量。数据证实了模拟结果，即基板的类型和AD工艺的配置是影响能源使用，投资成本以及后续沼气升级的运营和维护成本的两个因素。此外，模拟表明，基于离子液体的升级的能耗低于斯堪的纳维亚AD工厂的常规升级技术。离子液体技术的估计成本（包括投资，运营和维护）比水洗升级工艺的成本低。