填料氢氧化铝的物化性能对其使用及制品性能的影响

综述了氢氧化铝粉体的物化性能．如晶粒形貌、杂质含量、吸油率、水分等对其制品使用及性能的影响情况,指出了高档氢氧化铝填料的发展方向。     

扬子石化-巴斯夫丙烯酸及酯联合装置工程设计

介绍巴斯夫专利的 16 0kt/a丙烯酸及酯联合装置的工艺技术、产品、能耗和工程设计。     

聚醚酯消泡剂的制备

研究了脂肪酸聚醚酯消泡剂的制备,讨论了它们的合成条件,研究了聚醚酯型消泡剂各组分在消泡方面的协同效应,讨论了影响消泡能力的因素及不同条件对消泡剂的消泡能力的影响,确定了EO与PO聚醚比、抑泡树脂、乳化剂、疏水剂、液态烃A、液态烃B的添加量对消泡性能的影响,归纳出最优配比：PPG：PEG=7：3、乳化剂HLB=8．5、疏水剂1％-2％、抑泡剂4％～5％、液态烃A为10％、液态烃B为20％、疏水剂1％～2％。结果为聚醚酯型消泡剂的深入研究提供了较可靠的实验依据。     

Study of the modulus of elasticity of polymer concrete compounds and comparative assessment of polymer concrete and portland cement concrete

The main aim of this study is to assess the modulus of elasticity of polymer concrete (PC) compounds produced using two types of binders: orthophtalic or isophtalic polyester. The compositions used were selected from a previous study that identified cost-effective PC compositions. Based on those data, the concentrations of polymer used were 12% of orthophtalic polyester and 13% of isophtalic polyester by weight of the dry materials. Fly ash was used as a filler and compositions with 8%, 12%, 16% and 20% of ash by weight of aggregate were studied. Results indicate that all compositions assessed in this study display high modulus of elasticity values. Statistical analysis of the data reveals that the type of resin and the concentration of fly ash, both in isolation and in combination, have a significant effect on the modulus of elasticity of these compounds.     

Modelling of packed bed adsorption columns for the separation of green tea catechins

Green tea is a rich source of catechins, which when purified have a high economic value as they can be used as a supplement in several products, to increase their health benefits. Catechins are regarded as desired components with several applications in a variety of areas such as foods, cosmetics and pharmaceuticals. A multicomponent sorption model has been developed for the separation of catechins from liquid tea streams, with macroporous resins in a packed bed column. Two commercially available food grade resins were considered: Amberlite XADHP and Diaion HP20. For the desorption step, two food grade solvents are used: water and ethanol. The adsorption and desorption behaviour is subsequently mathematically described with one-dimensional axial dispersed plug flow model that can accurately simulate the dynamics of the solvent swing sorption columns. The model parameters were regressed from experimental data. Five components are modelled in the competitive sorption: the main four catechins present in green tea and caffeine. The model was used for the process design and optimization for the recovery of catechins from green tea.     

树脂催化重汽油烷基化硫转移的动力学研究

采用树脂催化剂,研究重汽油中噻吩类硫化物的烷基化硫转移性能,分析反应前后硫分布的变化,并对反应动力学进行研究。结果表明,在反应温度110℃和反应时间60 min条件下,烷基化硫转移率大于90%,其反应动力学为一级反应速率方程,反应活化能为20.32 kJ·mol~(-1),指前因子为1 364 h~(-1),噻吩类硫化物烷基化反应的动力学方程可表示为:r=1364exp(-2.445×10~3/T)c_T。     

氨基树脂表面活化提高固定化核酸酶P1连续催化性能

考察了固定化酶常用载体-氨基树脂几何结构及表面活化过程对固定化核酸酶P₁性能的影响,并进行了动力学和连续催化稳定性研究。FESEM、BET及FTIR等表征发现,氨基树脂具有大量酶可利用的孔,在固定化过程中核酸酶P₁主要利用的孔径范围为4～30 nm。相对游离的核酸酶P₁而言,所得固定酶耐酸、耐热性增强;米氏动力学研究表明各组固定酶对底物的亲和力下降,最大反应速率下降;后交联组的重复利用性相对物理吸附、化学交联组明显增强。优化的固定化条件为：酶和载体比例为3：20（质量比）,酶浓度为0.8 g·L^-1,酶液pH为6.0,固定时间为10 h,在优化条件下所得固定酶的单位载体酶活为10013 U·g^-1。同时设计及优化柱连续反应器操作条件,确定反应温度为65℃,进料流量为0.75 ml·min^-1,使得产品的核苷酸浓度维持30 g·L^-1（水解率为60%）以上的累计时长达120 h,有利于核酸酶P₁连续生产核苷酸的工业化应用。     

碳纤维增强轻质耐压复合材料的制备及性能研究

通过模压工艺制备了短切碳纤维/空心玻璃微珠(K46)/环氧树脂复合材料,并对复合材料的断面形貌、密度、抗压强度和吸水率进行了研究。研究结果表明,随着碳纤维含量的增加,复合材料密度变化较小,抗压强度上升,当碳纤维含量为4%时,抗压强度最大,微珠含量分别为50%、55%、60%的复合材料的抗压强度分别为68.9MPa、65.1MPa、57.2MPa;随碳纤维含量的增加,复合材料饱和吸水率下降,当碳纤维含量为4%时,微珠含量为55%、60%的复合材料达到最小饱和吸水率,分别为0.81%、1.15%。     

芳香型聚氨酯改性环氧树脂共混材料的研究

以芳香型二元醇为原料，用原位聚合的方法制备了环氧树脂／芳香型聚氨酯共混材料。用红外光谱表征了其反应，测试了所得材料的力学性能，用热失重和差示扫描量热法对所得材料进行了热性能研究。结果表明，用芳香型聚氨酯改性环氧树脂，既能提高环氧树脂的韧性，也能提高环氧树脂的力学性能与热性能。     

723型阳离子交换树脂催化合成甲基叔丁基醚

本文研究利用723型阳离子交换树脂催化合成MTBE，采用正交设计的统计方法，对影响产率的各因素如反应温度，反应时间，催化剂用量和原料摩尔比进行组合，找到合适的工艺路线，最佳反应条件为：催化剂用量为5g，甲醇与叔丁醇比为3：1，反应时间为7h。