聚苯硫醚反应淤浆的处理工艺

综述了聚苯硫醚反应淤浆的处理工艺，包括聚苯硫醚树脂的收集，溶剂的回收和反应助剂的回收两部分，并展望了聚苯硫醚反应淤浆处理工艺的发展趋势。     

热煤气脱硫工艺基础特性研究

本文介绍了在加压流化床脱硫间歇试验装置上进行的热煤气脱碱工艺基础性研究结果，利用美国ＵＣＩ公司制备的高温钛酸锌脱硫剂研究了反应温度，压力，气体速度等因素对煤气脱硫过程的影响；     

La2O3对Mo5Si3/MoSi2复合材料的改性研究

通过粉末冶金方法制备了Mo5Si3/MoSi2和La2O3/Mo5Si3/MoSi2复合材料,探讨了其烧结工艺.检测了其密度、维氏硬度、抗弯强度和断裂韧性,运用X射线衍射仪和扫描电镜（SEM）研究了La2O3对Mo5Si3/MoSi2复合材料显微结构和力学性能的改性影响.结果表明,La2O3/Mo5Si3/MoSi2复合材料的合理烧结温度为1600 ℃,比MoSi2材料提高了100 ℃; 稀土氧化物的加入细化了晶粒,且明显提高了材料的致密度、维氏硬度和抗弯强度; 其强化机制为细晶强化和弥散强化; 韧化机制为细晶韧化、裂纹偏转、裂纹分支和微桥接.     

超临界流体干燥法制备纳米TiO2－ZnO复合催化剂及其对苯酚降解的光催化性能

 以TiCl4和Zn（NO3）2·6H2O为原料，采用溶胶－凝胶法结合超临界流体干燥法制备了纳米级TiO2－ZnO（7～10nm）复合催化剂，并用XRD和TEM等手段进行了表征．以苯酚光催化降解为模型反应对所制备催化剂的催化性能进行了评价．结果表明，与单组分TiO2及普通干燥法制备的TiO2－ZnO催化剂相比较，纳米TiO2－ZnO复合粒子的光催化活性有较大提高．用超临界干燥法制备的催化剂具有粒径小、分布窄、比表面积大、分散性好和光催化活性高等特点．采用超临界流体干燥法可直接制得纳米TiO2（锐钛矿型）－ZnO（非晶态）复合催化剂，可实现干燥、晶化一步完成．复合催化剂中ZnO的最佳掺入量为x（ZnO）＝0．8％．超临界流体干燥法是制备纳米材料的一种新技术，具有产物容易收集和溶剂可回收利用等优点．     

La0.67Sr0.33FexMn1-xO3制备和奇特磁电阻效应

The Ln0.67Sr0.33Fe.Mn1-xO3(LSFMO)(0.05< x <0.33) systems have been synthesized by co-precipitation. The X-ray diffraction patterns indicates that these compounds are of single phase with rhombohedral structure. The resistivity of samples was measured in zero field and applied field (H=4000Oe) by a standard four-probe method. Large magnetoresistance (MR) was found in all samples. There is a resistivity transition peak in LSFMO (x ≦0.13) in which MR negative, the temperature (TP) at which the resistivity peak occurs decreases with the increasing of x. LSFMO (x=0.23) to which the large negative MR is still found is a semiconductor, It is unexpected that a peculiar alternative positive negative MR was found in LSFMO(x=0.33) which also is a semicondutor.     

Isothermal Kinetics Modelling of the Fischer-Tropsch Synthesis over the Spray-Dried Fe-Cu-K Catalyst

The isothermal kinetics of the Fischer-Tropsch synthesis (FTS) over Fe-Cu-K spray-dried catalyst was studied in a spinning basket reactor. The experiments were carried out at a constant temperature of 523 K, n(H2)/n(CO) feed ratios of 0.8-2.0, reactor pressures of 1.1-2.5 MPa, and space velocity of 0.556×10-3 Nm3/kgcat·s. Kinetic model for hydrocarbon formation was derived on the basis of simplified carbide mechanism to reduce the number of parameters. Two individual rate constants for methane and ethene were considered. Furthermore, the model was modified empirically by non-intrinsic effect, such as physisorption and fictitious olefin pressures that were taken into account, and the influences of secondary reaction of α-olefins on product distribution. The simulation results showed that the experimental phenomena of FTS and the deviations from ASF distribution, such as the relatively high yield of methane and low yield of ethene observed experimentally could be depicted basically.     

THE EFFECT OF EC ON ORIENTATION AND RELAXATION OF PP OBTAINED VIA DYNAMIC PACKING INJECTION MOLDING

As a long term project aiming at engineering plastics based on polypropylene (PP), in this work, we report the effect of ethylene-cellulose (EC) on the orientation and relaxation of PP obtained via dynamic packing injection molding (DPIM). 2d-WAXD results showed that PP with a highly oriented structure and a shish-kebab structure were achieved by DIPM, leading to an increase of tensile strength from 35.0MPa to 48.6MPa. The degree of orientation of PP was increased by adding only 1% of EC, resulting in a further increase of tensile strength from 48.6MPa to 53.8MPa. Shish was found to exist not only in the oriented layer but also in the core of the sample after adding EC, as evidenced by DSC result.This was understood as due to the overall decrease of viscosity by the addition of EC, thus an increasing of shear rate. Higher shear rate can favor the orientation of molecules and continuous growth of shish structure, resulting in a change of shish distribution along the sample thickness. On the other hand, the relaxation mode of shish in the melt recrystallization of PP is also greatly affected by the presence of EC. A retarded relaxation of PP macromolecules was seen.Even more, SEM results showed that EC could form the short fibers in PP matrix along the shear flow direction. Compared with the morphology obtained by conventional injection molding, a much better dispersion and easy break-up of EC in PP matrix were observed for samples obtained by dynamic packing injection molding.     

SWELLING EQUILIBRIUM OF NONIONIC POLYACRYLAMIDE HYDROGEL IN AQUEOUS SALT SOLUTIONS

A series of nonionic polyacrylamide hydrogels, using acrylamide as monomer and N,N＇-methylene diacrylamide as crosslinking agent, were prepared by the free radical polymerization in aqueous solution. Swelling equilibria for the gels were carried out in aqueous solutions of NaCl, KCI, CaCl2, Na2HPO4 and K2HPO4 with concentration ranging from 10^-3 to 5mol/kgH2O at 25 ℃. Experimental results revealed that the chlorides and phosphates cause a different behavior at higher salt concentration. The swelling ratio increases with increasing concentration of chlorides salts, while decreases with the increased phosphates salt concentration. The phenomena seem to be related to the different interactions of chloride and hydrogen phosphate ions with the network groups. Furthermore, the effects of different concentration of crosslinking agent and total monomers on gel swelling performance were also investigated.     

HPLC分析法在克林霉素磷酸酯合成工艺中的应用

采用高效液相色谱-内标法研究了克林霉素磷酸酯合成工艺的后处理过程.结果表明在克林霉素磷酸酯的浓缩过程中高温下会有少量分解,故应对浓缩温度及时间进行控制.     

离子交换法从发酵液中提取L-异亮氨酸

采用天然高分子絮凝剂壳聚糖对L-异亮氨酸发酵液进行预处理，在发酵液pH=2，壳聚糖用量30mg／L的条件下可取得较好的絮凝效果．并通过静态吸附实验，考察了pH和L—异亮氨酸浓度对平衡吸附量的影响．最后确定了732″离子交换树脂提取L-异亮氨酸的最佳工艺条件：上柱发酵液pH=2，上样速度0．6BV／h，洗脱液为0.5mol／L的NH4Cl．流出液经脱色、浓缩结晶后得L-异亮氨酸成品，总提取率为55％．