硅丙乳液的合成新工艺及其性能表征

由于有机硅的低表面能和硅氧烷的长链大分子结构,难以被乳化剂乳化而进入胶束,有机硅和丙烯酸单体的共聚受到很大限制,因此以丙烯酸酯、乙烯基硅油为主要原料,以OP-10和十二烷基硫酸钠(SDS)为复合乳化剂,采用连续滴加法,制备了有机硅改性丙烯酸酯乳液(硅丙乳液).论述了聚合工艺,利用红外光谱和激光粒度分析仪等方法对乳液及其涂膜的性能进行了分析与表征.结果表明,这种合成工艺简便、经济、产率高;乳液尺寸分布窄,各项性能优异;其涂层无色透明、附着力好,并有较强的耐水性(吸水性4.8%).     

皮革固体废弃物制备铬鞣剂

利用紫外-可见分光度法（UV-VIS）和红外光谱,对蓝皮屑和葡萄糖分别还原红矾制备铬鞣液进行了研究。研究发现,不同还原剂反应速率相差较大。在紫外区256nm和352nm处有两个吸收谱带,短波吸收峰强度高于长波吸收峰强度;短波吸收峰消失,红矾转化率只达到85%左右,而长波吸收峰消失,红矾反应基本完全。并发现两种铬鞣剂的组成和结构差别较大。     

DSC法对动态硫化PP／EPDM中PP—EPDM共交联结构的研究

根据共交联ＰＰ分子与正常ＰＰ分子在结晶与熔融特征及其对外因素响应上的差异,采用ＤＳＣ分析方法,研究了动态硫化ＰＰ／ＥＰＤＭ中ＰＰ－ＥＰＤＭ共交联结构。结果显示在动态硫化ＰＰ－ＥＰＤＭ的熔融ＤＳＣ曲线上的１５０℃曲线上约１５０℃处出现一新的熔融峰,改变结晶速率或ＤＳＣ测试程序,可发现形成这一新峰的化学结构具有强烈的结晶滞后性,而简单共混ＰＰ／ＥＰＤＭ的ＤＳＣ曲线上始终未出现类似新峰。结合化学反应理论     

热成像技术在乙烯裂解炉热故障诊断中的应用

概述了红外热成像技术应用于石化设备检测的基本原理和方法,着重阐明了在乙烯装置裂解炉热故障识别与诊断方面的应用,分析了故障成因。     

乙烯精脱CO催化性能的影响因素

针对应用于气相乙烯脱CO工业BR-9201催化剂,对其在其抗低温波动和抗CO浓度波动能力进行了考察。在研究中发现催化剂的可逆性失活因素,即微量水和CO2;此外在共沉淀法制备中,催化剂中残余Na2O含量对微量CO脱除的影响。     

环氧乙烷反应器的安全设计问题

从环氧乙烯的易燃易爆性着手，剖析了传统式非离子表面活怀剂的生产中的不安全性，介绍了一种新型的安全性反应器。     

Syntheses of group 4 transition metal complexes bearing 2-pyridinethiolate ligands and their catalytic activities for ethylene polymerization

Titanium bis(2-pyridinethiolate) complexes, Ti(6-R-SPy)₂(NMe₂)₂ (6-R-SPy = 6-R-2-pyridinethiolate, 3a: R = H; 3b: R = Me; 3c: R = Ph; 3d: R = C₆H₄-4-Me; 3e: R = C₆H₄-4-t-Bu; 3f: R = C₆H₃-3,5-Me₂), and the titanium bis(2-pyridinolate) complexes, Ti(6-Ph-OPy)₂(NMe₂)₂ (6-Ph-OPy = 6-phenyl-2-pyridinolate, 8) were prepared by treating Ti(NMe₂)₄ with 2 equiv. of 6-R-2-pyridinethiol or 6-Ph-2-pyridinol. The cis-configuration of the diamido moieties in the pseudo octahedral geometry was elucidated by X-ray crystallography for 3a. Reaction of M(NMe₂)₄ (M = Ti, Zr) with 4 equiv. of 2-pyridinethiol cleanly gave tetrakis(pyridinethiolate) complexes, M(6-H-SPy)₄·THF (6: M = Ti; 7: M = Zr). The triangular dodecahedral geometries of 6 and 7 were also revealed by X-ray crystallography. These complexes catalyzed ethylene polymerization upon activation with MAO (methylaluminoxane) or MMAO (modified MAO). The catalytic activities of titanium bis(6-aryl-pyridinethiolate) systems were found to be remarkably higher than that of titanium bis(6-methyl-pyridinethiolate) system. Among the complexes synthesized in this study, Ti[6-(C₆H₃-3,5-Me₂)-SPy]₂(NMe₂)₂ (3f)/MMAO showed the highest activity (1200 kg/Ti-mol h atm) for ethylene polymerization at 60 °C under atmospheric pressure. In contrast, the activity of the corresponding 6-aryl-pyridinolate system 8/MMAO was rather low (9.3 kg/Ti-mol h atm). Both the N-S chelating structure and the bulky aryl substituents are essential for the high activities of the 6-aryl-pyridinethiolate complexes.     

中原聚乙烯反应器提高生产能力的探讨

简单介绍了中原乙烯上/下游装置相互制约的特点,分析了影响聚乙烯反应器生产能力的因素,提出并实施了提高生产能力的措施,确定了提高现有装置生产能力的途径.     

发挥整体优势提高乙烯装置竞争力

从上下游资源配置、炼-化一体化、联副产品整体综合利用及工艺技术开发等几个方面，对如何提高中国石油乙烯装置竞争力进行了初步的探讨。     

Ethylene epoxidation on Ag catalysts supported on non-porous, microporous and mesoporous silicates

The ethylene epoxidation activity of Ag catalysts supported on non-porous SiO₂, microporous silicalite zeolite and mesoporous MCM-41 and HMS silicates was investigated in the present study in comparison to conventional low surface area -Al₂O₃ based catalysts. The MCM-41 and HMS based catalysts exhibited similar ethylene conversion activity and ethylene oxide (EO) selectivity with the SiO₂ and -Al₂O₃ based catalysts at relatively lower temperatures (up to 230 °C), whereas their activity and selectivity decreased significantly at higher temperatures (≥300 °C). The silicalite based catalyst was highly active for a wide temperature range, similar to the SiO₂ and -Al₂O₃ based catalysts, but it was the less selective amongst all catalysts tested. High loadings of Ag particles (up to ca. 40 wt.%) with medium crystallites size (20–55 nm) could be achieved on the mesoporous materials resulting in very active epoxidation catalysts. The HMS-type silicate with the 3D network of wormhole-like framework mesopores (with average diameter of 3.5 nm), in combination with a high-textural (interparticle) porosity, appeared to be the most promising mesoporous support.