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Synthesis of 1-Octene Oligomer by Rare Earth Coordination Catalyst 被引量:1
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作者 张小俊 杨慕杰 沈之荃 《Journal of Rare Earths》 SCIE EI CAS CSCD 1992年第3期195-198,共4页
The polymerization of 1-octene with Nd(P_(204))_3-AlEt_3 catalyst has been successfully carried out for the first time.Some features of polymerization of 1-octene are described.The 1-octene oligomer prepared has an av... The polymerization of 1-octene with Nd(P_(204))_3-AlEt_3 catalyst has been successfully carried out for the first time.Some features of polymerization of 1-octene are described.The 1-octene oligomer prepared has an average molecular weight of about 10~3 with molecular weight distribution of about 2.It has a terminal double bond,which can be transferred into terminal carboxy group by direct oxidation with KMnO_4 in acidic solution, and then can be esterified with polyglycol. 展开更多
关键词 Rare earth coordination catalyst 1-octene OLIGOMER
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COPOLYMERIZATION OF ETHYLENE WITH 1-OCTENE USING Et(Ind)_2ZrCl_2/MAO CATALYST
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作者 姚晖 肖士镜 陆宏兰 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1998年第1期32-37,共6页
Copolymerization of ethylene/1-octene was carried out in toluene withvarious concentrations of comonomer in the feed using Et(Ind)_2ZrCl_2/MAO (methyl alu-minoxane) as catalyst. It was found that with the increase of ... Copolymerization of ethylene/1-octene was carried out in toluene withvarious concentrations of comonomer in the feed using Et(Ind)_2ZrCl_2/MAO (methyl alu-minoxane) as catalyst. It was found that with the increase of 1-octene concentration in thefeed the content of 1-octene in the copolymer increases, while the density, melting point,crystallinity and intrinsic viscosity of copolymer decrease. A copolymer with very lowdensity, containing 11.5 mol% of 1-octene (VLLDPE) can be produced with this catalystsystem. The effect of temperature and zirconium aluminum mole ratio of the catalyst onthe copolymerization was also investigated. The results of ^(13)C NMR determination of thecopolymer showed that the 1-octene units in the copolymer are principally isolated. 展开更多
关键词 COPOLYMERIZATION ETHYLENE 1-octene METHYLALUMINOXANE Et(Ind)_2ZrCl_2
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Thermoregulated Organic Biphasic Hydrogenation of 1-Octene Catalyzed by Ru/PETPP Complex
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作者 Ya Dong LU Yan Hua WANG Zi Lin JIN 《Chinese Chemical Letters》 SCIE CAS CSCD 2006年第2期255-257,共3页
Thermoregulated organic biphasic system composed of triethylene glycol monomethyl ether (TGME) and n-heptane was first applied to the hydrogenation of 1-octene. Under the optimal conditions: P(H2)=5.0MPa, T=80℃,... Thermoregulated organic biphasic system composed of triethylene glycol monomethyl ether (TGME) and n-heptane was first applied to the hydrogenation of 1-octene. Under the optimal conditions: P(H2)=5.0MPa, T=80℃, t=3h, 1-octene/Ru=1000 (molar ratio), the yield of n-octane reached up to 99.6%. Furthermore, the simply decanted catalyst could be reused for 10 times without apparent loss of catalytic activity. 展开更多
关键词 Thermoregulated organic biphasic system HYDROGENATION 1-octene ruthenium.
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COPOLYMERIZATION OF 1-OCTENE WITH STYRENE BY RARE EARTH COORDINATION CATALYSTS
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作者 杨慕杰 张小俊 +1 位作者 李俭扶 沈之荃 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1992年第2期106-112,共7页
The copolymerization of l-octene with styrene catalyzed by rare earth coordination catalysts has been studied for the first time. Some features and kinetic behavior are described. The overall activation energy of the ... The copolymerization of l-octene with styrene catalyzed by rare earth coordination catalysts has been studied for the first time. Some features and kinetic behavior are described. The overall activation energy of the copolymerization was 22.2 KJ/mol and the copolymerization rate could be expressed as R_p=K_p [Nd] [M]~2. (=1.68×10^(-3) L^2/mol^2. S, 50℃, [Oct]/[St]=1). The catalytic activity of various rare earth elements in Ln (naph)_3 for the copolymerization was compared and shows the following sequence: Dy, Y, Yb>Ho>Sm, Gd, Nd>Pr>Ce>La>Tm. Both monomers of l-octene and styrene in the copolymerization by Nd (naph)_3-AlEt_3 have the tendency of constant proportion copolymerization. The structure of the copolymers was studied by ~1H-NMR. 展开更多
关键词 1-octene STYRENE COPOLYMERIZATION Rare earth catalyst
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STUDY ON THE MECHANISM OF 1-OCTENE ZIEGLER-NATTA POLYMERIZATION BASED ON THE NUMBER OF ACTIVE CENTERS
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作者 范志强 封麟先 杨士林 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1991年第2期113-119,共7页
The number of active centers (C_p)-t and k_p-t profiles of Solvay type TiCl_3 - AlR_3 (R=C_2H_5, i-C_4H_9) or Stauffer AA TiCl_3-Al (C_2H_5)_3 catalyzed 1-octene polymerization were determined by using an acetyl chlor... The number of active centers (C_p)-t and k_p-t profiles of Solvay type TiCl_3 - AlR_3 (R=C_2H_5, i-C_4H_9) or Stauffer AA TiCl_3-Al (C_2H_5)_3 catalyzed 1-octene polymerization were determined by using an acetyl chloride quenching method as well as kinetic data. The results show that in the studied systems k_p decreases when C_p increases, indicating the presence of two or more types of different active centers. The C_(p^(-t)) plots of the Solvay TiCl_3-AlR_3 systems show the presence of both stable active centers and unstable centers which decay in the polymerization process. The phenomena are explained based on a model of active center plurality. The increases of C_p in the induction periods are also discussed. 展开更多
关键词 1-octene Ziegler-Natta polymerization MECHANISM Active center
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^(13)C-NMR STUDY OF ETHYLENE-1-OCTENE COPOLYMERS
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作者 徐志康 封麟先 杨士林 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1994年第3期193-200,共8页
A ^(13)C-NMR method is presented for a quantitative determination of the respective monomercomposition and sequence distributions in ethylene-1-octene copolymers prepared with supportedtitanium/magnesium catalyst. On ... A ^(13)C-NMR method is presented for a quantitative determination of the respective monomercomposition and sequence distributions in ethylene-1-octene copolymers prepared with supportedtitanium/magnesium catalyst. On the basis of the sequence distributions, the ethylene-1-octenecopolymerization mechanism was studied. It was found that the observed sequence distributions inethylene-1-octene copolymers are satisfactorily predicted by the two-site model M/M,in whichthe copolymerization proceeds according to first-order Markovian statistics at the two differentsites. 展开更多
关键词 Ethylene-1-octene copolymer Sequence distribution ^(13)C NMR
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Hydroformylation of 1-Octene over Nanotubular TiO2-supported Amorphous Co-B Catalysts 被引量:4
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作者 SHI Yukun HU Xiaojing ZHU Baolin ZHANG Shoumin HUANG Weiping 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2015年第5期851-857,共7页
TiO2 nanotubes supported amorphous Co-B(Co-B/TNTs) catalyst was prepared via impregnation- chemical reduction procedure. The catalyst was characterized with transmission electron microscopy(TEM), ammonia temperatu... TiO2 nanotubes supported amorphous Co-B(Co-B/TNTs) catalyst was prepared via impregnation- chemical reduction procedure. The catalyst was characterized with transmission electron microscopy(TEM), ammonia temperature-programmed desorption(NH3-TPD), thermogravimetry-differential thermal analysis(TG-DTA), Fourier transform infrared spectroscopy(FTIR) and Raman spectroscopy. The effects of temperature and ratio of CO to HE on the hydroformylation of 1-octene were studied. At an optimized reaction temperature(150 ℃) and volume ratio of CO to H2(2:1), the conversion of 1-octene can reach 97.4% with a selectivity of 23.1% for total aldehydes and n/i-aldehyde molar ratio of 40:60. To obtain higher selectivity for linear aldehydes, Co-B/TNTs modified with triphenylphosphine for the hydroformylation of 1-octene were investigated. When molar ratio of P/Co was 4, the yield of total aldehydes was the highest(31.6%) with a good selectivity for linear product(n/i-aldehyde molar ratio was 70:30). In recycle use, the Co-B/TNTs catalyst modified with triphenylphosphine could be reused five times without reducing the activity and selectivity obviously. For a comparative study, all the Co-B/TNTs to catalyze the hydroformylation of other olefins exhibited high conversion under the optimized conditions. 展开更多
关键词 HYDROFORMYLATION TiO2 nanotubes Amorphous Co-B 1-octene
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POLYMERIZATION OF 1-OCTENE AND DETERMINATION OF MARKHOUWINK CONSTANTS OF POLY(1-OCTENE)
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作者 付志峰 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2011年第5期560-568,共9页
The polymerization of 1-octene initiated by methylalmnoxane (MAO)-activated Ni(II)-based-a-diimine complexes [(2,6-i-Pr)2C6H3-DAB(An)]NiBr2 was investigated. Using this catalyst, poly(1-octene)s with molecul... The polymerization of 1-octene initiated by methylalmnoxane (MAO)-activated Ni(II)-based-a-diimine complexes [(2,6-i-Pr)2C6H3-DAB(An)]NiBr2 was investigated. Using this catalyst, poly(1-octene)s with molecular weight between 100 × 10^3 and 400 ×10^3 and polydispersity (Mw/Mn) between 1.3 and 1.5 were synthesized successfully by varying reaction time at room temperature. The poly(1-octene)s were amorphous polymers and could be well soluble in tetrahydrofuran (THF). After fractional precipitation, poly(1-octene)s with narrow molecular weight distributions (Mw/Mn 〈 1.12) were obtained. Their weight-average molecular weights were measured by gel permeation chromatography (GPC) in conjunction with online model BI-MwA multiangle laser light scattering (MALLS), and their intrinsic viscosities were measured by Maron's single-point method. The k and a values in Mark-Houwink equation [η] = KM^a in THF at 40α were 0.089 mL/g and 0.61 respectively. 展开更多
关键词 Nickel(a-diimine) catalyst Poly(1-octene Mark-Houwink constants.
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Highly Selective Diphoshinoamine/Cr(III) Catalysts for Ethylene Tetramerization 被引量:1
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作者 Tao JIANG Hong Xia CHEN +1 位作者 Ying Nan NING Wei CHEN 《Chinese Chemical Letters》 SCIE CAS CSCD 2006年第3期358-360,共3页
Two novel diphoshinoamine ligands have been synthesized. Combination of Cr(Ⅲ) and methylaluminoxane(MAO) generated active catalytic system which can catalyze tetramerization of ethylene with high catalytic activi... Two novel diphoshinoamine ligands have been synthesized. Combination of Cr(Ⅲ) and methylaluminoxane(MAO) generated active catalytic system which can catalyze tetramerization of ethylene with high catalytic activity up to 2.5×10^6 g/mol Cr.h and high selectivity to produce 1-octene (Cs in products is being 89.80 wt%). 展开更多
关键词 Ethylene tetramerization 1-octene Cr(Ⅲ) diphoshinoamine MAO catalyst
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Preparation and Catalytic Performance of Silica-Supported Cr(acac)_3/PNP for Ethylene Tetramerization 被引量:1
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作者 Shao Huaiqi Li Yafei +4 位作者 Gao Xianglu Zhang Baojun Yi Jianjun Jiang Tao Li Jian 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2014年第1期45-51,共7页
Chromium acetylacetonate and bis(diphenylphosphino)isopropylamine were coordinated in situ and supported on methylaluminoxane-modified silica. The catalyst structure and effects of reaction temperature, reaction press... Chromium acetylacetonate and bis(diphenylphosphino)isopropylamine were coordinated in situ and supported on methylaluminoxane-modified silica. The catalyst structure and effects of reaction temperature, reaction pressure and Al/Cr molar ratio on ethylene tetramerization were investigated in detail. Chromium was uniformly and firmly immobilized on the support and could not be leached off by methylaluminoxane. The supported catalyst, upon being activated with methylaluminoxane, exhibited catalytic activity of 1.70×107 g/(mol Cr·h) for ethylene tetramerization to form 1-octene at a reaction temperatures of 80 ℃, a pressure of 2.0 MPa and an Al/Cr molar ratio of 300. The supported catalyst presented a good tolerance to high temperature. 展开更多
关键词 ethylene tetramerization 1-octene Cr(acac)3/PNP supported catalyst
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Effects of Al(i-Bu)_3 on Propylene Polymerization and Copolymerization by rac-Me_2Si(Ind)_2ZrCl_2/MAO
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作者 Zhi Qiang FAN Yong Hui ZHANG +1 位作者 Qi WANG Lin Xian FENG (Department of Polymer Science and Engineering, Zhejiang University, HangZhou 310027) 《Chinese Chemical Letters》 SCIE CAS CSCD 1998年第1期83-85,共3页
The effects of adding Al(i-C_4H_9)_3 (TBA) to rac-Me2Si(Ind)2ZrCl2/ MAO catalyzed propylene-1-octene copolymerization were studied. At TBA /MAO (Al/AI mole ratio) of about 0.6, the polymerization activity was found to... The effects of adding Al(i-C_4H_9)_3 (TBA) to rac-Me2Si(Ind)2ZrCl2/ MAO catalyzed propylene-1-octene copolymerization were studied. At TBA /MAO (Al/AI mole ratio) of about 0.6, the polymerization activity was found to be much higher than the system without TBA. Increases of polymer molecular weight and 1-octene content from addition of TBA were also observed. 展开更多
关键词 propylene-1-octene POLYMERIZATION metallocene catalyst
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