以TiCl_4/MgCl_2为主催化剂,Al(i-Bu)3为助催化剂,α-烯烃为单体,利用溶液聚合法合成了1-戊烯/1-十二烯二元共聚物减阻剂,首次将1-戊烯作为单体引入减阻剂的制备中。利用室内环道评价聚合物的减阻性能,并考察了反应条件对减阻效果的影...以TiCl_4/MgCl_2为主催化剂,Al(i-Bu)3为助催化剂,α-烯烃为单体,利用溶液聚合法合成了1-戊烯/1-十二烯二元共聚物减阻剂,首次将1-戊烯作为单体引入减阻剂的制备中。利用室内环道评价聚合物的减阻性能,并考察了反应条件对减阻效果的影响。结果表明,最优聚合条件为戊烯添加量为0.05 m L,十二烯用量为16 m L,主催化剂用量为0.08 g,助催化剂用量为0.1 m L,聚合温度为5℃,此时减阻率可达57.62%。~1HNMR、^(13)CNMR对二元共聚物的表征结果表明烯烃聚合完全;一元和二元共聚物的XRD谱图对比结果表明,在1-十二烯中引入1-戊烯共聚可显著降低聚合物的结晶度。展开更多
When converting C_(5) hydrocarbons to light olefins by catalytic pyrolysis,the generation of low value-added methane will affect the atomic utilization efficiency of C_(5) hydrocarbons.To improve the atomic utilizatio...When converting C_(5) hydrocarbons to light olefins by catalytic pyrolysis,the generation of low value-added methane will affect the atomic utilization efficiency of C_(5) hydrocarbons.To improve the atomic utilization efficiency,different generation pathways of light olefins and methane in the catalytic pyrolysis of C_(5) hydrocarbons were analyzed,and the effects of reaction conditions and zeolite types were inves-tigated.Results showed that light olefins were mainly formed by breaking the C_(2)-C_(3) bond in the middle position,while methane was formed by breaking the C_(1)-C_(2) bond at the end.Meanwhile,it was discovered that the hydrogen transfer reaction could be reduced by about 90%by selecting MTT zeolite with 1D topology and FER zeolite with 2D topology under high weight hourly space velocity(WHSV)and high temperature operations,thus leading to the improvement of the light olefins selectivity for the catalytic pyrolysis of n-pentane and 1-pentene to 55.12% and 74.60%,respectively.Moreover,the fraction ratio of terminal C_(1)-C_(2) bond cleavage was reduced,which would reduce the selectivity of methane to 6.63%and 1.83%.Therefore,zeolite with low hydrogen transfer activity and catalytic pyrolysis process with high WHsV will be conducive to maximize light olefins and to decrease methane.展开更多
A new reduced chemical kinetic model of 1-pentene is developed based on a detailed chemical kinetic model of 1-pentene at high temperature(194 species and 1266 reactions).By means of sensitivity and flow rate analyses...A new reduced chemical kinetic model of 1-pentene is developed based on a detailed chemical kinetic model of 1-pentene at high temperature(194 species and 1266 reactions).By means of sensitivity and flow rate analyses,32 important reactions are determined,on the basis of which a reduced chemical kinetic model consisting 50 species and 251 reactions is proposed through addition of other important species and reactions.The results show that the simulated cylinder pressure and temperature calculated using the reduced model agree well with those from the detailed model.The reduced model requires less computing time than the detailed model,which enables coupled computation of the chemical kinetic model with computational fluid dynamics.展开更多
合成了一种N,N-二齿配位的新型树枝状桥联吡啶亚胺配体及其镍配合物,利用元素分析、傅里叶变换红外光谱（FTIR）和电喷雾电离质谱（ESI-MS）对其结构进行了表征.以二氯乙基铝（Et Al Cl2）为助催化剂,考察了树枝状桥联镍配合物催化乙烯...合成了一种N,N-二齿配位的新型树枝状桥联吡啶亚胺配体及其镍配合物,利用元素分析、傅里叶变换红外光谱（FTIR）和电喷雾电离质谱（ESI-MS）对其结构进行了表征.以二氯乙基铝（Et Al Cl2）为助催化剂,考察了树枝状桥联镍配合物催化乙烯齐聚和1-戊烯齐聚的聚合条件对产物分布的影响.结果表明,当聚合时间为60 min,聚合压力为0.5 MPa,Al/Ni摩尔比为150时,乙烯齐聚产物中C10~C14的选择性最高,达到93%,催化活性为0.99×106g/（mol Ni·h）;当聚合时间为60 min,Al/Ni摩尔比为300时,1-戊烯齐聚产物中C20的选择性最高为70.5%,催化活性为2.47×105g/（mol Ni·h）.该树枝状桥联镍配合物对乙烯齐聚反应和1-戊烯齐聚反应均具有良好的催化活性和较高碳数的齐聚产物选择性.展开更多
Poly(4-methyl-1-pentene) (PMP) hollow fiber membranes were prepared by the melt-spun and cold-stretch(MSCS) method. Scanning electronic microscopy (SEM) was used to characterize the section and surface structures of t...Poly(4-methyl-1-pentene) (PMP) hollow fiber membranes were prepared by the melt-spun and cold-stretch(MSCS) method. Scanning electronic microscopy (SEM) was used to characterize the section and surface structures of themembranes with special asymmetric structure. The preliminary results of gas permeation measurements indicated that the resultant hollow fiber membranes have the potential ability for oxygen/nitrogen separation.展开更多
文摘以TiCl_4/MgCl_2为主催化剂,Al(i-Bu)3为助催化剂,α-烯烃为单体,利用溶液聚合法合成了1-戊烯/1-十二烯二元共聚物减阻剂,首次将1-戊烯作为单体引入减阻剂的制备中。利用室内环道评价聚合物的减阻性能,并考察了反应条件对减阻效果的影响。结果表明,最优聚合条件为戊烯添加量为0.05 m L,十二烯用量为16 m L,主催化剂用量为0.08 g,助催化剂用量为0.1 m L,聚合温度为5℃,此时减阻率可达57.62%。~1HNMR、^(13)CNMR对二元共聚物的表征结果表明烯烃聚合完全;一元和二元共聚物的XRD谱图对比结果表明,在1-十二烯中引入1-戊烯共聚可显著降低聚合物的结晶度。
基金supported by Program of China National Petroleum Corporation(2020B-20122022zS27)the General Program of National Natural Science Foundation of China(22178385).
文摘When converting C_(5) hydrocarbons to light olefins by catalytic pyrolysis,the generation of low value-added methane will affect the atomic utilization efficiency of C_(5) hydrocarbons.To improve the atomic utilization efficiency,different generation pathways of light olefins and methane in the catalytic pyrolysis of C_(5) hydrocarbons were analyzed,and the effects of reaction conditions and zeolite types were inves-tigated.Results showed that light olefins were mainly formed by breaking the C_(2)-C_(3) bond in the middle position,while methane was formed by breaking the C_(1)-C_(2) bond at the end.Meanwhile,it was discovered that the hydrogen transfer reaction could be reduced by about 90%by selecting MTT zeolite with 1D topology and FER zeolite with 2D topology under high weight hourly space velocity(WHSV)and high temperature operations,thus leading to the improvement of the light olefins selectivity for the catalytic pyrolysis of n-pentane and 1-pentene to 55.12% and 74.60%,respectively.Moreover,the fraction ratio of terminal C_(1)-C_(2) bond cleavage was reduced,which would reduce the selectivity of methane to 6.63%and 1.83%.Therefore,zeolite with low hydrogen transfer activity and catalytic pyrolysis process with high WHsV will be conducive to maximize light olefins and to decrease methane.
基金supported by the National Natural Science Foundation of China (51106181)the State Key Laboratory of Engines in Tianjin University (K2012-06)Promotive Research Fund for Young and Middle-Aged Scientists of Shandong Province (BS2012NJ012)
文摘A new reduced chemical kinetic model of 1-pentene is developed based on a detailed chemical kinetic model of 1-pentene at high temperature(194 species and 1266 reactions).By means of sensitivity and flow rate analyses,32 important reactions are determined,on the basis of which a reduced chemical kinetic model consisting 50 species and 251 reactions is proposed through addition of other important species and reactions.The results show that the simulated cylinder pressure and temperature calculated using the reduced model agree well with those from the detailed model.The reduced model requires less computing time than the detailed model,which enables coupled computation of the chemical kinetic model with computational fluid dynamics.
基金This work was supported by the National Natural Science Foundation of China (Grant No. 59833120).
文摘Poly(4-methyl-1-pentene) (PMP) hollow fiber membranes were prepared by the melt-spun and cold-stretch(MSCS) method. Scanning electronic microscopy (SEM) was used to characterize the section and surface structures of themembranes with special asymmetric structure. The preliminary results of gas permeation measurements indicated that the resultant hollow fiber membranes have the potential ability for oxygen/nitrogen separation.
