新型增塑剂环己烷二羧酸二烷基酯

介绍了新型增塑剂环己烷二羧酸酯的性能、制法和被其增塑的PVC制品性能评价。环己烷二羧酸酯综合性能较好,在自然环境中可降解,无生态毒性,可应用于食品包装、医疗器械和儿童玩具。     

不同温度、压力下环己烷－乙酸乙酯体系液体密度的测定和预测

使用ＤＭＡ５５型精密密度计和ＤＭＡ５１２型高压外测量池，测定了环己烷－乙酸乙酯体系在温度２８８．１５—３１８．１５Ｋ，压力从常压—１９．５ＭＰａ下的液体密度。应用三重随机局部组成密度模型，预测了该体系在不同温度、压力下的密度，取得令人满意的结果     

环己烷在碘吸附器活性炭床上的解吸行为研究

对环己烷气体在碘吸附器用浸渍活性炭上的动态解吸行为进行了实验研究。考察了不同的载气温度、相对湿度、流速、炭床厚度以及进气中环己烷浓度对环己烷在活性炭床上解吸行为的影响,为环己烷试验方法在碘吸附器现场泄漏率试验的研究及推广提供了一定的理论支撑。试验结果表明:(1)在40 ℃,30%相对湿度条件下环己烷在活性炭床上可滞留约500 min,增大气流温度、湿度、浓度和载气流速可以减少滞留时间,其中温度对滞留时间的影响最为显著。(2)在气流相对湿度为80%时,浓度为100 ppm(10^-6)的环己烷在活性炭床上的滞留时间仍达到90 min,这有利于高湿度条件下进行碘吸附器泄漏率试验。     

Synergistic enhancement in tensile strength and ductility of ABS by using recycled PETG plastic

Acrylonitrile–butadiene–styrene (ABS)/poly(ethylene glycol‐co‐cyclohexane‐1,4‐dimethanol terephthalate) (PETG) blends with various ratios at three different processing temperatures were prepared. A significant synergistic enhancement in tensile strength and ductility for a wide range of compositions was achieved. Phase morphology with droplets, fibrils, and co‐continuity was obtained, depending on the composition and processing temperature. Changes of the phase domain sizes and the composition range of co‐continuity were found with the change of processing temperature and could be explained by temperature‐induced coalescence effects. The synergism and toughening mechanism were discussed based on the temperature‐morphology‐property relationships. Since the PETG used is a recycled plastic from the waste films and plates, our work provides a new and inexpensive means for the modification of ABS with high mechanical properties. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

环已烷废液的回收

探索出一套回收方法,使环已烷废液回收率达到80%,节约了费用,减少了对环境的污染。     

提高环己烷生产装置能力的措施

分析了环己烷生产装置在实际运行过程中影响能力发挥的因素，提出了解决措施，以利于指导生产设计、生产操作和运行管理。     

吸收系数影响受激布里渊散射的实验研究

选用四氯化碳和环己烷的混台溶液作为散射介质，实验研究了不同混合比介质所产生的SBS脉宽、能量和波形的差异．分析讨论了吸收系数对SBS性能的影响。     

Solid-liquid phase equilibria of benzene + cyclohexane system under high pressures

Solid-liquid phase equilibria of the benzene + cyclohexane system have been investigated experimentally at temperatures from 278 to 323 K and pressures up to 500 MPa using a newly designed optical vessel. The uncertainties of the measurements of temperature, pressure, and composition are within ±0.1 K, ±0.5 MPa, and ±0.001 mole fraction, respectively. The solid-liquid equilibrium pressure at a constant composition increases almost linearly with increasin temperature. The eutectic point shifts to a higher temperature and to a benzenerich composition with increasing pressure. This trend is found to agree with the direction predicted by the van Laar equation. The solid-liquid coexistence curves can be expressed by the Wilson equation with a mean deviation of 0.007 and a maximum deviation of 0.029 in mole fraction.     

Photocatalytic oxidation of cyclohexane over TiO2 nanoparticles by molecular oxygen under mild conditions

The structure, physical characteristics and photocatalytic selective oxidation properties of nanometer‐size TiO₂ particles produced by a sol–gel method were studied by X‐ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), X‐ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR) and photocatalytic selective oxidation measurements. Analysis of the XRD results shows that sol–gel‐produced TiO₂ nanoparticles have the anatase structure at annealing temperatures ≤973 K, that the rutile structure begins to emerge at annealing temperatures ≥973 K and the particles have the pure rutile structure at 1023 K. DRS indicates that the obtained TiO₂ nanoparticles exhibit a blue shift with decreasing crystallite size. Analysis of the XPS results shows that the TiO₂ nanoparticles have a lot of oxygen vacancies. The EPR spectrum of TiO₂ at 77 K is composed of a strong isotropic EPR Surface‐Ti³⁺ signal(I) at g = 1.926 and a weak broad Bulk‐Ti³⁺ signal (II) at g = 1.987. Quantitative EPR indicates that both signals show a size and temperature dependence. Photocatalytic oxidation of cyclohexane into cyclohexanol with high selectivity and activity has been obtained by activation of molecular oxygen over sol–gel‐produced TiO₂ nanoparticles under mild conditions in dry solvent, which reveals that the quantum size effect and surface state effect of nanoparticles are key points for governing the selective photocatalytic reaction. The photocatalytic oxidation mechanism under dry solvent is different from that in aqueous solutions. Copyright © 2003 Society of Chemical Industry     

影响六氢苯甲酸产品中苯甲酸含量的主要因素

分析了六氢苯甲酸加氢过程中影响苯甲酸转化率的主要因素,提出了相应地优化措施。