用CS-2-G/ZN1l8混合催化剂替代ZN118催化剂,在300 kt/a的Spherizone工艺气相聚丙烯装置上进行工业试生产,生产拉丝料聚丙烯LHP456J,考察了CS-2-G型催化剂在该装置上掺混使用的可行性。结果表明:CS-2-G/ZN1l8混合催化剂在Spherizone工艺...用CS-2-G/ZN1l8混合催化剂替代ZN118催化剂,在300 kt/a的Spherizone工艺气相聚丙烯装置上进行工业试生产,生产拉丝料聚丙烯LHP456J,考察了CS-2-G型催化剂在该装置上掺混使用的可行性。结果表明:CS-2-G/ZN1l8混合催化剂在Spherizone工艺气相聚丙烯装置上具有较强的适应性,整个试用过程装置安全平稳运行,产品质量合格。LHP456J was produced in 300 kt/a Spherizone gas-phase polypropylene plant using CS-2-G/ ZN1l8 as a substitute catalyst for ZN118. The feasibility of mixing CS-2-G catalyst in the Spherizone gas-phase polypropylene plant was investigated. The results show that the mixed catalyst CS-2-G/ZN1l8 has strong adaptability to the Spherizone process in the gaseous polypropylene plant. The whole trial process of the plant runs safely and stably, and the product quality is qualified.展开更多
As the traditional graphite-based composites cannot meet the requirement of rapid developing modern industry, novel sliding electrical contact materials with high self-lubricating performance in multiple environments ...As the traditional graphite-based composites cannot meet the requirement of rapid developing modern industry, novel sliding electrical contact materials with high self-lubricating performance in multiple environments are eagerly required. Herein a copper-based composite with WS2 and graphite as solid lubricant are fabricated by powder metallurgy hot-pressed method. The friction and wear behaviors of the composites with and without current are investigated under the condition with sliding velocity of 10 m/s and normal load of 2.5N/cm 2 in both air and vacuum. Morphologies of the worn surfaces are observed by optical microscope and compositions of the lubricating films are analyzed by XPS. Surface profile curves and roughness of the worn surfaces are obtained by 2205 surface profiler. The results of wear tests show that the friction coefficient and wear volume loss of the composites with current are greater than that without current in both air and vacuum due to the adverse effects of electrical current which damaged the lubricating film partially and roughed the worn surfaces. XPS results demonstrate that the lubricating film formed in air is composed of oxides of Cu, WS2 , elemental S and graphite, while the lubricating film formed in vacuum is composed of Cu, WS2 and graphite. Because of the synergetic lubricating action of oxides of Cu, WS2 and graphite, the composites show low friction coefficient and wear volume loss in air condition. Owing to the fact that graphite loses its lubricity which makes WS2 become the only lubricant, severe adhesive and abrasive wear occur and result in a high value of wear rate in vacuum condition. The formation of the lubricating film on the contact interface between the brush and ring is one of the factors which can greatly affect the wear performance of the brushes. The low contact voltage drop of the composites in vacuum condition is attributed to the high content of Cu in the surface film. This study fabricated a kind of new sliding electrical contact self-lubricating composite with dual-lubricant which can work well in both air and vacuum environments and provides a comprehensive analysis on the lubrication mechanisms of the composite.展开更多
The crystal structure of 3-（4-methoxyphenyl）-2-（4-methylbenzoyl）-6,7-dihydro-5H-furo[3,2-g]chromene was obtained by X-ray single-crystal diffraction. The molecule is in the triclinic crystal system, space group P1...The crystal structure of 3-（4-methoxyphenyl）-2-（4-methylbenzoyl）-6,7-dihydro-5H-furo[3,2-g]chromene was obtained by X-ray single-crystal diffraction. The molecule is in the triclinic crystal system, space group P1 with a = 11.0745（4）, b = 13.0953（7）, c = 15.8773（8） ？, α = 92.811（4）, β = 104.815（4）, γ = 111.797（4）o, Z = 4, the final R = 0.0567 and w R = 0.1540. X-ray crystal structure data revealed that one asymmetric structure unit of the title compound contained two molecules. The existence of methyl group changed the dihedral angle between furan ring and the phenyl ring at the C2 position of the furo[3,2-g]chromene scaffold as well as the conformation, and had a further influence on the bioactivity of the furo[3,2-g]chromene derivatives.展开更多
文摘用CS-2-G/ZN1l8混合催化剂替代ZN118催化剂,在300 kt/a的Spherizone工艺气相聚丙烯装置上进行工业试生产,生产拉丝料聚丙烯LHP456J,考察了CS-2-G型催化剂在该装置上掺混使用的可行性。结果表明:CS-2-G/ZN1l8混合催化剂在Spherizone工艺气相聚丙烯装置上具有较强的适应性,整个试用过程装置安全平稳运行,产品质量合格。LHP456J was produced in 300 kt/a Spherizone gas-phase polypropylene plant using CS-2-G/ ZN1l8 as a substitute catalyst for ZN118. The feasibility of mixing CS-2-G catalyst in the Spherizone gas-phase polypropylene plant was investigated. The results show that the mixed catalyst CS-2-G/ZN1l8 has strong adaptability to the Spherizone process in the gaseous polypropylene plant. The whole trial process of the plant runs safely and stably, and the product quality is qualified.
基金supported by Major Research Program of National Natural Science Foundation of China(Grant No. 91026018)National Natural Science Foundation of China(Grant No. 60979017)Doctoral Fund of Ministry of Education of China(Grant No. 20110111110015)
文摘As the traditional graphite-based composites cannot meet the requirement of rapid developing modern industry, novel sliding electrical contact materials with high self-lubricating performance in multiple environments are eagerly required. Herein a copper-based composite with WS2 and graphite as solid lubricant are fabricated by powder metallurgy hot-pressed method. The friction and wear behaviors of the composites with and without current are investigated under the condition with sliding velocity of 10 m/s and normal load of 2.5N/cm 2 in both air and vacuum. Morphologies of the worn surfaces are observed by optical microscope and compositions of the lubricating films are analyzed by XPS. Surface profile curves and roughness of the worn surfaces are obtained by 2205 surface profiler. The results of wear tests show that the friction coefficient and wear volume loss of the composites with current are greater than that without current in both air and vacuum due to the adverse effects of electrical current which damaged the lubricating film partially and roughed the worn surfaces. XPS results demonstrate that the lubricating film formed in air is composed of oxides of Cu, WS2 , elemental S and graphite, while the lubricating film formed in vacuum is composed of Cu, WS2 and graphite. Because of the synergetic lubricating action of oxides of Cu, WS2 and graphite, the composites show low friction coefficient and wear volume loss in air condition. Owing to the fact that graphite loses its lubricity which makes WS2 become the only lubricant, severe adhesive and abrasive wear occur and result in a high value of wear rate in vacuum condition. The formation of the lubricating film on the contact interface between the brush and ring is one of the factors which can greatly affect the wear performance of the brushes. The low contact voltage drop of the composites in vacuum condition is attributed to the high content of Cu in the surface film. This study fabricated a kind of new sliding electrical contact self-lubricating composite with dual-lubricant which can work well in both air and vacuum environments and provides a comprehensive analysis on the lubrication mechanisms of the composite.
基金supported by the National Natural Science Foundation of China(No.J1103606)the Program for Innovative Research Team of the Ministry of Education of China(No.IRT_14R36)
文摘The crystal structure of 3-（4-methoxyphenyl）-2-（4-methylbenzoyl）-6,7-dihydro-5H-furo[3,2-g]chromene was obtained by X-ray single-crystal diffraction. The molecule is in the triclinic crystal system, space group P1 with a = 11.0745（4）, b = 13.0953（7）, c = 15.8773（8） ？, α = 92.811（4）, β = 104.815（4）, γ = 111.797（4）o, Z = 4, the final R = 0.0567 and w R = 0.1540. X-ray crystal structure data revealed that one asymmetric structure unit of the title compound contained two molecules. The existence of methyl group changed the dihedral angle between furan ring and the phenyl ring at the C2 position of the furo[3,2-g]chromene scaffold as well as the conformation, and had a further influence on the bioactivity of the furo[3,2-g]chromene derivatives.
