摘要
采用紫外光接枝填充聚合技术,以非对称聚丙烯腈(PAN)超滤膜为底膜,聚乙二醇甲醚甲基丙烯酸酯(MePEO300MA)为大分子单体,制备了芳烃优先透过的渗透汽化复合膜。考察了单体浓度和紫外光照射反应时间对复合膜甲苯/正庚烷渗透汽化分离性能的影响,并对复合膜降低石脑油芳烃含量,优化乙烯裂解原料进行了初步探索。研究结果表明,复合膜对甲苯质量分数为20%的甲苯/正庚烷混合物(80℃)的分离系数达到5.6,渗透通量为2.47 kg/(m2.h);当切割比为20%时,石脑油的芳烃质量分数由7.52%降至4.11%,降低了45%,初步说明渗透汽化复合膜在降低石脑油的芳烃含量,优化乙烯裂解原料方面的应用前景。
The composite membranes were prepared by the UV induced graft-filling polymerization method for the pervaporation separation of aromatic/aliphatic mixtures. The asymmetric poly （acrylonitrile） （PAN） uhrafihration membranes were used as the substrate, which were grafted with poly（ethylene glycol） methyl ether methacrylate （MePEO300MA）. The impact of preparation parameters （monomer con- centration and UV irradiation time） was analyzed using PV separation of toluene/heptane mixtures. High selectivities （ a totuene/hep = 5.6） and high permeate fluxes （J = 2.47 kg· m^ -2. h ^- 1 ） were achieved. The aromatic concentration of naphtha decreased with increasing stage cut. At the stage cut of 20% , an approximate 45% reduction of aromatics in the naphtha was obtained, i. e. , from 7.52% to 4. 11% , which showed the feasibility of the ethylene feed upgrading by PV aromatic removal from naphtha.
出处
《化学工业与工程》
CAS
2010年第2期177-182,共6页
Chemical Industry and Engineering
关键词
渗透汽化
芳烃/烷烃分离
乙烯裂解原料
接枝填充聚合
复合膜
pervaporation
aromatics/aliphatics separation
ethylene feedstock
graft-filling polymerization
composite membrane
