Yahaya Garba O, Choi Seung-Hak, Sultan Melhan M Ben, Hayek Ali
Research & Development Center Saudi Aramco P.O. Box 62 Dhahran 31311 Saudi Arabia.
Glob Chall. 2020 Mar 12;4(7):1900107. doi: 10.1002/gch2.201900107. eCollection 2020 Jul.
The consumption of natural gas (NG) is rapidly increasing worldwide as it is becoming the second largest fuel source after coal. However, many of the world gas reserves contain high levels of subquality NG including the presence of carbon dioxide (CO), hydrogen sulfide (HS), nitrogen (N), benzene/toluene/xylene (BTX) etc., in varying amounts (up to 50% v/v in some reserves), which constitute several problems. Membrane-based NG sweetening/upgrading processes emerge as among the fastest growing technologies, due to their lower capital cost, higher energy savings, greater economic viability, etc. as compared to conventional technologies. Thus, a defective-free, multilayer thin-film composite membrane is developed from 6FDA-Durene/6FDA-CARDO block co-polyimide for the separation of sour gas from NG. The membrane shows good performance as it exhibit CO/CH and HS/CH selectivities ranges from 8 to 10 and 15 to 19, respectively, and CO and HS permeance are 122 and 220 GPU, respectively.
随着天然气（NG）成为仅次于煤炭的第二大燃料来源，其在全球范围内的消费量正在迅速增长。然而，世界上许多天然气储备含有高含量的劣质天然气，包括不同含量（在某些储备中高达50%体积/体积）的二氧化碳（CO）、硫化氢（HS）、氮气（N）、苯/甲苯/二甲苯（BTX）等，这带来了诸多问题。与传统技术相比，基于膜的天然气脱硫/提质工艺因其较低的资本成本、更高的能源节约、更大的经济可行性等，成为发展最快的技术之一。因此，采用6FDA-均苯四甲酸二酐/6FDA-咔唑嵌段共聚酰亚胺开发了一种无缺陷的多层薄膜复合膜，用于从天然气中分离酸性气体。该膜表现出良好的性能，其CO/CH和HS/CH选择性分别为8至10和15至19，CO和HS渗透率分别为122和220 GPU。
