ISSN : 1226-0088(Print)
ISSN : 2288-7253(Online)
ISSN : 2288-7253(Online)
Membrane Journal Vol.24 No.6 pp.438-447
DOI : https://doi.org/10.14579/MEMBRANE_JOURNAL.2014.24.6.438
DOI : https://doi.org/10.14579/MEMBRANE_JOURNAL.2014.24.6.438
Separation of Hydrogen-Nitrogen Gases by PTMSP-Borosilicate Composite Membranes
Suk Ho Lee, Tae Beom Kang†
Department of Chemistry, Sang Myung University, Seoul 110-743, Korea
Department of Chemistry, Sang Myung University, Seoul 110-743, Korea
2014.11.18
2014.12.08
2014.12.09
Abstract
The amorphous and porous borosilicate without any cracks was obtained under the following condition : 0.01∼0.10 mole ratio of trimethylborate (TMB)/ tetraethylorthosilicate (TEOS) and the temperature of 700∼800°C. According to the BET and SEM measurements, borosilicate heat-treated in between 700 and 800°C showed the surface area of 251.12∼355.62 m2/g, the pore diameter of 3.5∼4.9 nm, and the particle size of 30∼60 nm. According to the TGA measurements, the thermal stability of poly[1-(trimethylsilyl)propyne](PTMSP) membrane was enhanced by inserting borosilicate. SEM observation showed that the size of dispersed borosilicate in the composite membrane was 1 μm. The results showed that the permeability of H2 and N2 increased and the selectivity of H2/N2decreased upon the addition of borosilicate into PTMSP membranes. Addition of borosilicate may possibly increase the free volume, cavity and porosity of membranes indicating that permeation occurred by molecular sieving, surface and Knudsen diffusion rather than solution diffusion of gases.
PTMSP, borosilicate, PTMSP-borosilicate composite membrane, permeability, selectivity, hydrogen, nitrogen
PTMSP-Borosilicate 복합막에 의한 수소-질소 기체 분리에 관한 연구
이석호, 강태범†
상명대학교 화학과
상명대학교 화학과
초록
무정형의 괴상의 다공성 borosilicate는 trimethylborate (TMB)/ tetraethylorthosilicate (TEOS) 몰비 0.01∼0.10 겔체를 700∼800°C 온도범위에서 열처리 하였을 때 얻어졌다. BET와 SEM 관찰에 의하면 700∼800°C에서 얻어진 borosilicate의 표면적은 251.12∼355.62 m2/g이고, 기공직경은 3.5∼4.9 nm이며, 입자크기는 30∼60 nm이었다. TGA측정에 의하면 borosilicate가 poly[1-(trimethylsilyl)propyne](PTMSP)에 첨가되었을 때 PTMSP-borosilicate 복합막의 열적 안정성은 향상 되었다. SEM관찰에 의하면 borosilicate는 1 μm 크기로 복합막 내에 분산되어 있었다. 기체투과실험에 의하면 PTMSP에 borosilicate 함량이 증가하면 자유부피, 공동, 기공률이 증가하여 기체투과가 용해확산에 의한 것보다 분자체거름, 표면확산, Knudsen 확산에 의해 일어나는 경우가 점차 증가함으로 해서 H2와 N2의 투과도는 증가하고 선택도(H2/N2)는 감소하였다.