Direct helium recovery from natural gas by dual reflux pressure swing adsorption cascade

级联 变压吸附 吸附 天然气 甲烷 等温过程 体积流量 空气分离 气体分离 工业气体 干气 分馏 沸石 化学 蒸馏 分析化学(期刊) 色谱法 热力学 有机化学 物理 催化作用 生物化学 氧气 涡轮机
作者
R. Weh,Gongkui Xiao,Ehsan Sadeghi Pouya,Eric F. May
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:450: 137894-137894 被引量:9
标识
DOI:10.1016/j.cej.2022.137894
摘要

Low-cost helium recovery processes optimised for unconventional sources e.g. small-scale natural gas (NG) reservoirs, offer a new approach to meeting growing demand. We investigated a two-stage dual reflux pressure swing adsorption (DR PSA) cascade for the recovery and purification of dilute helium from various natural gas source analogues comprising of CH4 + N2 + He. First, adsorption isotherms of a binderless zeolite 13X with high methane and nitrogen uptake were measured at 283 to 323 K and pressures up to 10 bar. This material was then used in a laboratory-scale DR PSA apparatus to identify key parameters affecting the separation performance, namely feed step time and location, as well as heavy product and light reflux flow rate. The experiments agreed well with the results of a non-isothermal numerical DR PSA model with an average deviation of 1 mol% between simulated and experimental product purities. Then, the model was extended to consider a two-stage DR PSA cascade with waste recycle. Axial composition profiles within the beds of each stage were obtained numerically and analysed to explain the impact of key process parameters on the separation performance. Tuning these parameters accordingly led to a helium-rich product with over 99 mol% He purity, which could be produced from various natural gas feeds containing from 0.1 to 1 mol% He at 90 to 98% recovery, respectively. The separation performance was compared to other helium recovery processes based on cryogenic distillation, membranes, pressure swing adsorption, and combinations thereof. Compared to these other systems, the DR PSA cascade process delivered a 99 mol% purity product from a 0.1 mol% helium in natural gas feed with 8% higher helium recovery.
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