Peg/pvdf membranes for separating organosulphur compounds from n-heptane: effect of peg molecular weight
Peg/pvdf membranes for separating organosulphur compounds from n-heptane: effect of peg molecular weight
复制标题
用于从正庚烷中分离有机硫化合物的聚乙二醇/聚偏氟乙烯膜：聚乙二醇分子量的影响
DOI：
10.1002/cjce.22657
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发表时间：
2017
影响因子：
2.1
通讯作者：
Cao Xingzhong
中科院分区：
文献类型：
--
作者：
Hu Wenling;Han Xiaolong;Liu Liangliang;Zhang Xin;Xue Juanqin;Wang Baoyi;Zhang Peng;Cao Xingzhong
采用三种不同分子量的聚乙二醇（PEG）制备了PEG/PVDF复合膜，用于渗透蒸发分离正庚烷和有机硫化合物。采用傅里叶变换红外光谱（FTIR）、扫描电镜（SEM）、X射线衍射（XRD）和正电子湮没光谱（PAS）对复合膜进行了表征。研究了操作温度、原料硫含量和有机硫种类对不同分子量PEG/PVDF复合膜性能的影响。当有机硫为噻吩时，通量随PEG分子量的增加而减小，但富集因子的顺序不同，分子量为35 000的PEG膜在85℃时对噻吩的富集因子最高，为12.59。当有机硫为2 -甲基噻吩或2,5 -二甲基噻吩时，发现分子量为10万的PEG膜富集系数最高。结果表明，PEG分子量对渗透蒸发脱硫分离性能有较大影响。
Polyethylene glycol (PEG) of three different molecular weights was used to prepare PEG/PVDF composite membranes for separating organosulphur compounds fromn‐heptane by pervaporation. All the composite membranes were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X‐ray diffraction (XRD), and positron annihilation spectroscopy (PAS). The effects of operating temperature, feed sulphur content, and organosulphur species on performance of PEG/PVDF composite membranes with different molecular weights were investigated. When the feed organosulphur was thiophene, the fluxes decreased with an increase in PEG molecular weight, however, the enrichment factors were in a different order: PEG membrane with molecular weight of 35 000 exhibited the highest enrichment factor of 12.59 for thiophene at 85 °C. When the feed organosulphur was 2‐methylthiophene or 2,5‐dimethylthiophene, it was found that the PEG membrane with molecular weight of 100 000 showed the highest enrichment factor. The results showed that PEG molecular weight has a considerable effect on separation performance for pervaporation desulphurization.