کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7019738 1455936 2018 35 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Molecular design of double crosslinked sulfonated polyphenylsulfone /polybenzimidazole blend membranes for an efficient hydrogen purification
ترجمه فارسی عنوان
طراحی مولکولی پلاکت های پلی فنیل سولفون / پلیبو گینیدیزول سولفونیک دوپارچه برای تصفیه هیدرولیز کارآمد
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
چکیده انگلیسی
This study, for the first time, demonstrates a new double-crosslinking approach to manipulate the microstructure and gas separation performance of PBI membranes for H2/CO2 separation at 150 °C. The PBI membranes were firstly blended with sulfonated polyphenylsulfone (sPPSU) as an ionic-crosslinker and then α,α′-dibromo-p-xylene (DBX) as a covalent crosslinker with the aid of thermal annealing. Experiments show that PBI and sPPSU interact on the molecular level. Different from conventional blends, the PBI/sPPSU blend membranes show both enhanced chemical resistance and greater fractional free volume (FFV) after annealing at elevated temperatures because of chain motion and ionic crosslinking. As a result, the blend membranes maintain their high permeability after annealing. The DBX addition further improves the chemical resistance and tightens the inter-chain spacing that results in membranes with a small FFV and pore size. Consequently, the DBX cross-linked blend membranes retain their high gas pair selectivity at high temperatures. The 50/50 PBI/sPPSU blend membrane crosslinked by 0.7 wt% DBX at 300 °C possesses the best separation performance surpassing the Robeson's upper bound. It has an impressively H2 permeability of 46.2 Barrer and a high H2/CO2 selectivity of 9.9 at 150 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 563, 1 October 2018, Pages 726-733
نویسندگان
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