In industry, ethylene(C_(2)H_(4))/propylene(C_(3)H_(6)) separations are usually performed by a cryogenic process,which is energy intensive. Membrane separation technology is an alternative separation process that save...In industry, ethylene(C_(2)H_(4))/propylene(C_(3)H_(6)) separations are usually performed by a cryogenic process,which is energy intensive. Membrane separation technology is an alternative separation process that saves energy and is efficient. In this study, blend membranes were prepared by doping polyethylene glycol(PEG600) into a poly(ether-block-amide)(Pebax^(■) 2533) matrix and were used to separate the C_(2)H_(4)/C_(3)H_(6) mixture. The PEG 600 and Pebax^(■) 2533 polymers have good compatibility because they share hydrogen bonds. The addition of PEG600 is conducive to the hydrophilicity and the free volume of blend membranes, and it is also conducive to the solubility of C_(2)H_(4) and C_(3)H_(6) in the membranes, which improves the ability of the membranes to separate this gas pair. The Pebax^(■) 2533/PEG600 blend membrane with 15%(mass) PEG600 showed the highest separation performance in our investigated membranes, with a C_(3)H_(6)/C_(2)H_(4) selectivity of 8.9 and a C_(3)H_(6) permeability of 196 barrer(1 barrer = 1.33×10^(14)m^(3)(STP)·m·m^(-2)·s^(-1)·kPa^(-1)) at 238 K and 0.2 MPa, which is higher than that of the Pebax^(■) 2533/NaY-6%(mass) membrane(α_(C_(3)H_(6)/C_(2)H_(4)) =6.5, P_(C_(3)H_(6))=211 barrer) reported in our previous work. It is confirmed that incorporating PEG600 into the Pebax^(■) 2533 matrix to fabricate blend membranes is an efficient strategy for separating light olefins.展开更多
以聚乙二醇(PEG600)为液相反应体系,硼氢化钠溶液为还原剂,硫酸铜为铜源,并添加氨水作为络合剂还原制备了纳米铜。使用扫描电镜(SEM)、元素能谱仪(EDS)、X射线衍射(XRD)等对纳米铜进行了特性分析,并利用正交实验探讨了影响纳米铜制备因...以聚乙二醇(PEG600)为液相反应体系,硼氢化钠溶液为还原剂,硫酸铜为铜源,并添加氨水作为络合剂还原制备了纳米铜。使用扫描电镜(SEM)、元素能谱仪(EDS)、X射线衍射(XRD)等对纳米铜进行了特性分析,并利用正交实验探讨了影响纳米铜制备因素的主次顺序,同时得到了纳米铜分散性和抗氧化性能的最优化条件:硫酸铜与硼氢化钠的浓度(mol/L)比为1:2,反应温度为65℃,反应时间为30 min,PEG600用量为35 m L(浓度538.5 m L/L)。另外,还研究了不同分子量的聚乙二醇对纳米铜性质的影响。展开更多
The work presents density(ρ) and viscosity(η) data of binary system polyethylene glycol 600(PEG) + dimethyl sulfoxide(DMSO) over the entire concentration range at T =(298.15, 303.15, 308.15, 313.15 and 318.15) K and...The work presents density(ρ) and viscosity(η) data of binary system polyethylene glycol 600(PEG) + dimethyl sulfoxide(DMSO) over the entire concentration range at T =(298.15, 303.15, 308.15, 313.15 and 318.15) K and atmospheric pressure. On the basis of density and viscosity values, the excess properties of PEG(1) + DMSO(2) mixtures, including excess molar volume(V_m^E), viscosity deviation(Δη), excess free energies of activation(ΔG^(*E)), and isobaric thermal expansion coefficient(αp), were calculated. At the same time, in order to conjecture the density viscosity under different conditions, the density and viscosity data were fitted with the corresponding formula. The calculated results of V_m^E, Δη, and ΔG^(*E) were fitted with the Redlich–Kister equation to derive coefficients and estimate the standard deviations(σ) between the experimental and calculated values. Moreover, the intermolecular interaction of PEG with DMSO was discussed on the basis of FTIR and UV–Vis spectral results of PEG(1) + DMSO(2) mixtures. The results indicated that there were the hydrogen bonding and interactions of hydroxyl hydrogen atoms in PEG with oxygen atoms in DMSO.展开更多
基金the financial support of the National Key Research and Development Program of China (2020YFB0606405)the Basic Research Program of Shanxi Province (20210302123197)+2 种基金the Key Project of the National Natural Science Foundation of China (21336006)the Scientific Research Foundation for Returned Scholars of Ministry of Education (2017047)the Foundation of State Key Laboratory of Highefficiency Utilization of Coal and Green Chemical Engineering (2017-K15)。
文摘In industry, ethylene(C_(2)H_(4))/propylene(C_(3)H_(6)) separations are usually performed by a cryogenic process,which is energy intensive. Membrane separation technology is an alternative separation process that saves energy and is efficient. In this study, blend membranes were prepared by doping polyethylene glycol(PEG600) into a poly(ether-block-amide)(Pebax^(■) 2533) matrix and were used to separate the C_(2)H_(4)/C_(3)H_(6) mixture. The PEG 600 and Pebax^(■) 2533 polymers have good compatibility because they share hydrogen bonds. The addition of PEG600 is conducive to the hydrophilicity and the free volume of blend membranes, and it is also conducive to the solubility of C_(2)H_(4) and C_(3)H_(6) in the membranes, which improves the ability of the membranes to separate this gas pair. The Pebax^(■) 2533/PEG600 blend membrane with 15%(mass) PEG600 showed the highest separation performance in our investigated membranes, with a C_(3)H_(6)/C_(2)H_(4) selectivity of 8.9 and a C_(3)H_(6) permeability of 196 barrer(1 barrer = 1.33×10^(14)m^(3)(STP)·m·m^(-2)·s^(-1)·kPa^(-1)) at 238 K and 0.2 MPa, which is higher than that of the Pebax^(■) 2533/NaY-6%(mass) membrane(α_(C_(3)H_(6)/C_(2)H_(4)) =6.5, P_(C_(3)H_(6))=211 barrer) reported in our previous work. It is confirmed that incorporating PEG600 into the Pebax^(■) 2533 matrix to fabricate blend membranes is an efficient strategy for separating light olefins.
文摘以聚乙二醇(PEG600)为液相反应体系,硼氢化钠溶液为还原剂,硫酸铜为铜源,并添加氨水作为络合剂还原制备了纳米铜。使用扫描电镜(SEM)、元素能谱仪(EDS)、X射线衍射(XRD)等对纳米铜进行了特性分析,并利用正交实验探讨了影响纳米铜制备因素的主次顺序,同时得到了纳米铜分散性和抗氧化性能的最优化条件:硫酸铜与硼氢化钠的浓度(mol/L)比为1:2,反应温度为65℃,反应时间为30 min,PEG600用量为35 m L(浓度538.5 m L/L)。另外,还研究了不同分子量的聚乙二醇对纳米铜性质的影响。
基金supported by the Natural Science Foundation of Inner Mongolia Autonomous Region (2016JQ02)the Program for Grassland Excellent Talents of Inner Mongolia Autonomous Region, Program for New Century Excellent Talents in University (NCET-12-1017)training plan of academic backbone in youth of Inner Mongolia University of Technology
文摘The work presents density(ρ) and viscosity(η) data of binary system polyethylene glycol 600(PEG) + dimethyl sulfoxide(DMSO) over the entire concentration range at T =(298.15, 303.15, 308.15, 313.15 and 318.15) K and atmospheric pressure. On the basis of density and viscosity values, the excess properties of PEG(1) + DMSO(2) mixtures, including excess molar volume(V_m^E), viscosity deviation(Δη), excess free energies of activation(ΔG^(*E)), and isobaric thermal expansion coefficient(αp), were calculated. At the same time, in order to conjecture the density viscosity under different conditions, the density and viscosity data were fitted with the corresponding formula. The calculated results of V_m^E, Δη, and ΔG^(*E) were fitted with the Redlich–Kister equation to derive coefficients and estimate the standard deviations(σ) between the experimental and calculated values. Moreover, the intermolecular interaction of PEG with DMSO was discussed on the basis of FTIR and UV–Vis spectral results of PEG(1) + DMSO(2) mixtures. The results indicated that there were the hydrogen bonding and interactions of hydroxyl hydrogen atoms in PEG with oxygen atoms in DMSO.
