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Efficient screening of novel adsorbents for coalbed methane recovery.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-08 , DOI: 10.1016/j.jcis.2020.01.008 Mai Xu 1 , Shuguang Deng 1
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-08 , DOI: 10.1016/j.jcis.2020.01.008 Mai Xu 1 , Shuguang Deng 1
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Many adsorbents with outstanding methane (CH4)/nitrogen (N2) separation performance are reported recently. Some may have the potential for coalbed methane (CBM) recovery to resolve the current energy crisis. However, no systematic assessment method for evaluating these adsorbents is available. This study was performed for efficient comparison and assessment of 47 novel adsorbents that are suitable for CBM recovery and to guide further adsorbent development with a three-step simulation-based method. First, the adsorbents of interest were prescreened based on the CH4/N2 adsorption selectivity predicted from the ideal adsorption solution theory and a composite parameter S that incorporates both adsorption selectivity and working capacity. Then, the top 10 adsorbents from the prescreening step were tested in a simulated vacuum pressure swing adsorption process. The process performance of the adsorbents was evaluated by comparing their product purity, recovery and productivity at two base conditions. It was observed that Cu-MOF and NAPC-3-6 exhibited the highest product purity and OAC-1 showed the highest product recovery and productivity at the two base cases. The process performance indicators of various adsorbents were also correlated with their adsorption selectivities and capacities to investigate how these adsorption characteristics would affect the process performance. We find that the working capacities of the adsorbents are highly related with the product recovery while the adsorption selectivities are more related with the product purity. Finally, a process optimization study was performed employing the three adsorbents that exhibited the best performance in the previous evaluation. The objective of the optimization is to minimize the energy consumption of the process while meeting specified product purity (95% or 98%) and recovery rate (90%). The decision variables include the evacuation pressure, feed flow rate and adsorption pressure. The sensitivity of each variable was also examined through a parametric study. The optimization results indicate that the adsorbent selection will depend on the production scale and purity requirement. OAC-1 is the best candidate for a large scale CH4 production with a regular purity grade while NAPC-3-6 is a better choice for a small scale CH4 production with high purity requirement.
中文翻译：
有效筛选新型吸附剂以回收煤层气。
最近报道了许多具有出色的甲烷（CH4）/氮（N2）分离性能的吸附剂。有些可能具有恢复煤层气（CBM）的潜力，以解决当前的能源危机。但是，没有用于评估这些吸附剂的系统评估方法。进行这项研究是为了对47种适用于煤层气回收的新型吸附剂进行有效比较和评估，并通过基于三步模拟的方法来指导进一步吸附剂的开发。首先，根据理想吸附溶液理论预测的CH4 / N2吸附选择性以及结合了吸附选择性和工作能力的复合参数S，对目标吸附剂进行了预筛选。然后，在模拟真空变压吸附过程中测试了预筛选步骤中排名前10位的吸附剂。通过比较两种基本条件下产品的纯度，回收率和生产率来评估吸附剂的工艺性能。观察到在这两种基本情况下，Cu-MOF和NAPC-3-6表现出最高的产品纯度，而OAC-1表现出最高的产品回收率和生产率。各种吸附剂的工艺性能指标也与它们的吸附选择性和能力相关，以研究这些吸附特性将如何影响工艺性能。我们发现，吸附剂的工作能力与产物的回收率高度相关，而吸附选择性与产物的纯度更相关。最后，使用在先前评估中表现出最佳性能的三种吸附剂进行了工艺优化研究。优化的目的是在满足指定的产品纯度（95％或98％）和回收率（90％）的同时，将过程的能耗降至最低。决策变量包括抽空压力，进料流速和吸附压力。还通过参数研究检查了每个变量的敏感性。优化结果表明，吸附剂的选择将取决于生产规模和纯度要求。OAC-1是具有常规纯度等级的大规模CH4生产的最佳候选人，而NAPC-3-6是具有高纯度要求的小型CH4生产的更好选择。
更新日期：2020-01-09
中文翻译：
有效筛选新型吸附剂以回收煤层气。
最近报道了许多具有出色的甲烷（CH4）/氮（N2）分离性能的吸附剂。有些可能具有恢复煤层气（CBM）的潜力，以解决当前的能源危机。但是，没有用于评估这些吸附剂的系统评估方法。进行这项研究是为了对47种适用于煤层气回收的新型吸附剂进行有效比较和评估，并通过基于三步模拟的方法来指导进一步吸附剂的开发。首先，根据理想吸附溶液理论预测的CH4 / N2吸附选择性以及结合了吸附选择性和工作能力的复合参数S，对目标吸附剂进行了预筛选。然后，在模拟真空变压吸附过程中测试了预筛选步骤中排名前10位的吸附剂。通过比较两种基本条件下产品的纯度，回收率和生产率来评估吸附剂的工艺性能。观察到在这两种基本情况下，Cu-MOF和NAPC-3-6表现出最高的产品纯度，而OAC-1表现出最高的产品回收率和生产率。各种吸附剂的工艺性能指标也与它们的吸附选择性和能力相关，以研究这些吸附特性将如何影响工艺性能。我们发现，吸附剂的工作能力与产物的回收率高度相关，而吸附选择性与产物的纯度更相关。最后，使用在先前评估中表现出最佳性能的三种吸附剂进行了工艺优化研究。优化的目的是在满足指定的产品纯度（95％或98％）和回收率（90％）的同时，将过程的能耗降至最低。决策变量包括抽空压力，进料流速和吸附压力。还通过参数研究检查了每个变量的敏感性。优化结果表明，吸附剂的选择将取决于生产规模和纯度要求。OAC-1是具有常规纯度等级的大规模CH4生产的最佳候选人，而NAPC-3-6是具有高纯度要求的小型CH4生产的更好选择。
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