Cryogenic carbon dioxide (CO₂) capture technologies showed promising results for the purification of highly sour natural gas reserves. However, quantitative experimental data for solid and liquid CO₂ formation during cryogenic separation is not adequately examined in the previous studies. Moreover, an economical and efficient cryogenic CO₂ capture technology with reduced energy and hydrocarbon losses is necessary to make it attractive for commercial use. A high-pressure cryogenic hybrid network comprised of the packed bed and the cryogenic separator was developed for the cryogenic experimental study on CO₂ capture from binary CO₂−CH₄ mixture to focus these areas. Feed containing 30, 50 and 70 % CO₂ content were used and the separation study was conducted in vapor-solid (V-S), vapor-liquid (V-L), and vapor-liquid-solid (V-L–S) regions of phase equilibria. The packed bed was used in the V-S operational domain to quantify CO₂ solid up to 20 bar because of the operational limitations. Separation characteristics and V-L isothermal flash measurements at 20, 30, and 40 bar pressure and temperature ranges from -20 to −60 °C were carried out in the cryogenic separator. The operation in the setups was carried out at different compositions of the CH₄−CO₂ binary mixture to define the boundaries of the hybrid cryogenic network. Liquid formation at 40 bar for 70 % CO₂ feed was 0.15 kg at -55 °C as compared to 0.03 kg for 30 % CO₂ feed. The simulation study was carried out using Aspen Plus along with the Peng Robinson Equation of State (EoS), and the results were compared with the experimental data, which showed good agreement. The hybrid cryogenic network showed an energy reduction of 37 % compared to the conventional cryogenic distillation network with 90.6–97.3 % CH₄ purity and 2.65–12.39 % methane losses with different arrangements of the hybrid cryogenic network.

低温二氧化碳（CO ₂）捕集技术在净化高酸天然气储量方面显示出令人鼓舞的结果。然而，在先前的研究中，低温分离过程中固态和液态CO ₂形成的定量实验数据尚未得到充分检查。此外，必须有经济有效的低温CO ₂捕集技术，以减少能源和碳氢化合物的损失，以使其具有商业用途。建立了由填充床和低温分离器组成的高压低温混合网络，用于从二元CO ₂ -CH _4中捕获CO ₂的低温实验研究。重点关注这些领域。使用了含有30％，50％和70％CO ₂含量的进料，并在相平衡的气固（VS），气液（VL）和气液固（VL–S）区域中进行了分离研究。由于操作限制，填充床用于VS操作域以定量高达20 bar的CO ₂固体。在低温分离器中进行了20、30和40 bar的压力以及-20至-60°C的温度下的分离特性和VL等温闪蒸测量。在装置中的操作是在CH ₄ -CO ₂二元混合物的不同组成下进行的，以定义混合低温网络的边界。70％CO在40 bar下形成液体₂进料在-55°C下为0.15 kg，而30％CO ₂进料为0.03 kg 。使用Aspen Plus和彭·鲁宾逊状态方程（EoS）进行了仿真研究，并将结果与​​实验数据进行了比较，表明吻合良好。与传统的低温蒸馏网络相比，混合低温网络显示出37％的能耗降低，CH ₄纯度为90.6–97.3％，甲烷的损失为2.65–12.39％，这是因为混合低温网络的布置不同。