Removal of mineral material from solvent-refined coal by solvent extractions

Solvent refined coal (SRC), a coal extract which is highly polyaromatic in character and relatively high in N, O and S content, is derived from the direct liquefaction of coal. SRC contains mineral matter in the form of soluble organometallic compounds which can not be removed by filtration. These soluble species can be detrimental to the hydrocracking catalyst used in the upgrading of the SRC to high-value liquid fuels. These species, however, can be separated from the SRC by extraction with benzene or tetralin as solvents so that the mineral matter is mainly concentrated in the solvent-insoluble fraction, the other fraction are then readily hydrocracked, as demonstrated in this work.     

Benzene Alkylation with Propane over Mo Modified HZSM-5

Benzene alkylation with propane has been studied over HZSM-5 loading 3.1–15.4 wt% Mo in continuous-flow microreactor under 350 °C and atmospheric pressure with the highest activity obtained at 6.7 wt% Mo loading. C_7–9 aromatics were obtained as main products while the total amount of benzene rings kept unchanged. i-Propylbenzene and n-propylbenzene are formed primarily, while toluene, ethylbenzene, and ethyl-toluene are formed secondly from the propylbenzenes. Catalytic performance of 6.7 wt% Mo/HZSM-5(38) partially poisoned by NH₃ shows that the strong acid sites play a crucial role in the alkylation. Low SiO₂/Al₂O₃ ratio of HZSM-5 in the Mo modified catalysts gives high propane conversion. Two hydrothermal treatment methods were applied to the 6.7 wt% Mo/HZSM-5(38) catalyst, caused decrease of propane conversion but result in different product distribution. A possible reaction mechanism concerning bifunctional active centers resulted from combination of loaded Mo species and strong acid centers on HZSM-5 is proposed.     

抗菌灭病毒涂料的研制及表征

在评价多种杀菌剂的抗病毒性能的基础上,筛选出杀菌和抗病毒性能均优异的功能助剂三氯苯基马来酰亚胺,用以研制成一种杀菌灭病毒功能内墙涂料。     

海明滴定法快速测定废水中的LAS含量

介绍了一种测定废水中LAS浓度的新方法。克服了常规方法亚甲基蓝比色法要绘制标准曲线，操作过程复杂等局限性。该方法测定过程简单，结果准确，标准偏差为1．4l，变异系数为3．92％。     

用激光技术测定液体中的声速和等熵压缩性系数

本文应用根据激光光声原理和技术建立的流体热力学性质测量实验装置，测定了七个温度下苯、四氯化碳液体中，苯与四氯化碳二元溶液中的声速（ｕ）、密度（ρ），计算了等熵压缩性系数（Ｋ＿ｓ）等热力学数据。用多项幂级数，以最小二乘法拟合声速ｕ与温度ｔ的数学关系。实测的声速值与文献值比较，相对误差小于０．０４％，等熵压缩性系数与文献数据也相当吻合。     

Determination of effectiveness factor of a partial internal wetting catalyst from adsorption measurement

The effect of partial internal wetting of catalyst pellets on apparent reaction kinetics at elevated temperatures and pressures is investigated experimentally and by modeling for benzene hydrogenation. A new method that combines adsorption and chemical reaction is introduced to study the kinetics influenced by capillary condensation of reagents at steady-state conditions. It is shown that the extent of liquid filling in the pellet interior has a critical effect on the global kinetics, and the current state of the catalyst depends on the history. Under certain conditions two steady states of the effectiveness factor exist. Moreover, either a decrease in temperature or increase in total pressure can increase the effectiveness factor. The model exhibits good agreement with experimental results.     

橡胶防老剂4020中间体合成过程的GC分析

应用程序升温色谱法对橡胶防老剂４０２０（Ｎ—（１，３—二甲基丁基）—Ｎ′—苯基对苯二胺）中间体进行了直接、快速的分析测试。主要分析对象是对氯硝基苯、四硝基二苯胺。     

超声波制备TiO2光催化降解气相苯的研究

文章以钛酸四丁酯为原料,采用超声波分散450℃焙烧物得到了纳米TiO2光催化剂,以苯为模拟气体,在静态反应装置中考察了该催化剂对气相苯的光催化降解性能。结果表明,采用超声波制备的TiO2光催化剂能显著提高对苯的光催化降解性能,超声波制备的TiO2上苯转化率是搅拌制备的TiO2的1.7倍。BET结果显示超声波制备的光催化剂比表面比搅拌制备的光催化剂高;XRD表征结果表明TiO2呈锐钛型;紫外-可见漫反射结果显示超声波制备的TiO2在可见区吸收增强。     

Towards a GC-based microsystem for benzene and 1,3 butadiene detection: Pre-concentrator characterization

The performance of a gas pre-concentrator/gas chromatographic column/gas sensor system was studied step by step towards benzene vapor in presence of 1,3 butadiene vapor. The pre-concentrator, based on an activated carbon of high adsorption capacity, was first characterized using a GC/FID system. By this way, the adsorption capacity of each pollutant was evaluated, first separately, then mixed with different proportions in air. It was shown that the affinity of the pre-concentrator for benzene was higher than for butadiene. Once the optimal pre-concentration parameters were adjusted, we replaced the FID detector by a metal oxide gas sensor. The use of such gas pre-concentrator allowed decreasing the detection limit of the system towards benzene in presence of butadiene by at least ten times.     

NiY/Beta复合分子筛吸附脱硫性能研究

采用液相离子交换法制备了NiY及NiY/Beta分子筛,利用智能重量分析仪测定了噻吩、苯在NiY、NiY/Beta分子筛上的吸附-脱附等温线,计算比较了噻吩、苯在分子筛上的扩散系数,同时使用固定床技术考查了改性后的分子筛对催化裂化汽油的吸附脱硫性能。结果表明,复合分子筛NiY/Beta仍然保持着较好的微孔结构,对噻吩的饱和吸附量大于苯的。而且噻吩在NiY/Beta分子筛上的相对扩散系数明显增大,而苯的扩散系数有所减少,这有利于噻吩在分子筛上的扩散过程,抑制了苯在分子筛上的吸附,从而提高了NiY/Beta复合分子筛对噻吩的选择性脱除能力。对于FCC汽油NiY/Beta复合分子筛也表现出更好的深度脱硫能力。