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991.
介绍了国内外型焦技术的生产工艺、型煤碳化的过程和影响因素,以及国内目前几种碳化窑炉,通过对型焦和焦炭的对比分析,指出洁净型焦生产技术的优势必然会使它在未来具有巨大的发展空间。 相似文献
992.
稀土BR/SBR共混胶的性能 总被引:1,自引:0,他引:1
研究了4种共混比的LnBR/SBR共混生胶、混炼胶及硫化胶的性能,并与NiBR/SBR共混胶进行了对比。结果表明,共混生胶的ML均低于LnBR及SBR;当LnBR/SBR共混混炼胶的ML、剪切应力、出口膨胀及硫化速度均低于NiBR/SBR共混胶,挤出物外观优于后者;共混硫化胶的拉伸强度、热空气老化、拉伸疲劳、湿滑、耐磨等性能均明显优于后者,生热和透气率高于后者。 相似文献
993.
994.
995.
PVC-FeCl3催化合成糠偶酰 总被引:6,自引:0,他引:6
研究了以糠醛为原料,维生素B1(VB1)为催化剂,采用安息香缩合反应合成糠偶姻,通过PVC-FeCl3及醋酸体系将其氧化为糠偶酰,并对中间产物及产物进行结构表征。 相似文献
996.
997.
Pengbao Lian Qiang Liu Lizhen Chen Cai Cao Jiaxiang Zhao Jianlong Wang 《中国化学工程学报》1982,28(10):2634-2639
In this paper, the solubility of 4-nitroimidazole in twelve pure solvents (toluene, benzene, 1,4-dioxane, acetonitrile, ethyl acetate, acetone, GBL, ethanol, methanol, n-butanol, DMF and NMP) were determined by using the laser monitoring system from 278.15 K to 323.15 K under 101.1 kPa, which are 0.00018-0.00070, 0.00021-0.00073, 0.00034-0.00092, 0.00038-0.00142, 0.00047-0.00120, 0.00126-0.00303, 0.00225-0.00517, 0.00310-0.00724, 0.00467-0.00982, 0.00453-0.01940, 0.01947-0.04652, and 0.04670-0.07452, respectively. At constant temperature, the mole fraction solubility of 4-nitroimidazole were increased as the following order: toluene < benzene < 1,4-dioxane < (ethyl acetate or acetonitrile) < acetone < GBL < ethanol < (methanol or nbutanol) < DMF < NMP, and the solubility of 4-nitroimidazole in (ethyl acetate, acetonitrile) and (methanol, n-butanol) had an intersection point at 297.55 K and 281.85 K, respectively. The solubility of 4-nitroimidazole could be increased with increasing temperature in twelve pure solvents. The ideal model, modified Apelblat equation, polynomial empirical equation, and λh equation were used to correlate the experimental values. The experimental solubility values were employed to calculate the standard dissolution enthalpy, standard dissolution entropy and Gibbs energy. The dissolution of 4-nitroimidazole could be an endothermic process in twelve pure solvents. The determination and fitting solubility of 4-nitroimidazole have important guiding significance for the purification and crystallization of its preparation process. 相似文献
998.
The epoxidation of propylene catalyzed by a reaction-controlled phase transfer catalyst [π-C5H5NC16H33]3[PW4O16] is investigated. The H2O2 is generated by the oxidation of 2-ethylanthrahydroquinone (EAHQ) with molecular oxygen in the organic solvent. Under mild conditions, the selectivity for propylene oxide, based on propylene, is 95%, and the yield, based on 2-ethylanthrahydroquinone, is 85%. During the epoxidation, the catalytic system is homogeneous. However, after the H2O2 is used up, the catalyst can be recovered as a precipitate and can be reused. After the epoxidation reaction, 2-ethylanthraquinone can be regenerated to 2-ethylanthrahydroquinone by catalytic hydrogenation, and no coproduct is produced. 相似文献
999.
Ye Cai ré Zimmermann Arndt Bauer Fritz Aldinger 《Journal of the American Ceramic Society》2003,86(9):1598-1600
Precursor-derived Si-C-N ceramics after creep testing in air were characterized using X-ray diffractometry (XRD) and transmission electron microscopy (TEM). XRD analysis showed that the crept Si-C-N ceramics were covered by an α-cristobalite layer. TEM observations revealed that the precipitated nanocrystallites in the crept Si-C-N ceramics were β-SiC. Between α-cristobalite and crept Si-C-N ceramic, there was an intermediate zone in which Si2 N2 O nanocrystallites were distributed homogeneously. Moreover, Si2 N2 O nanocrystallites were often found covering the surface of nanosized gas channels in the crept Si-C-N ceramics, where no α-cristobalite phase was detected. Based on these observations, a two-step oxidation mechanism of Si-C-N ceramics during creep testing in air was proposed. 相似文献
1000.
Flaky monoclinic La2Ti2O7 was prepared via a hydrothermal method based on the reaction of Ti(SO4)2 and La(NO3)3. Relative to the solid-state reaction sample, the flaky La2Ti2O7 showed higher surface areas, much smaller crystal size and more efficient light absorption. All these factors led to the
higher photoactivity to produce H2 from water splitting under UV irradiation. 相似文献