聚酰亚胺渗透汽化膜的研究 (Ⅰ )膜的制备和结构对动态吸附特性的影响

以2种二酐,3种二胺为单体,两步法制备了6种不同结构的聚酰亚胺均质膜.通过红外光谱和元素分析证实了其重复单元的分子结构,测定了这几种膜的物理性质和对水蒸气的动态吸附性能,并计算出其反常扩散指数dw.实验表明,随着聚合物二胺单元分子结构的变化,按MDA、ODA、PDA的顺序,密度逐渐变大,链间距逐渐减小,链堆砌变得紧密,水蒸气在膜中的吸附和扩散也变慢,并出现从正常扩散到反常扩散的过渡现象.

气体中醋酸甲酯在活性炭上的动态吸附

研究了Calgon活性炭对醋酸甲酯的动态吸附行为,从穿透时间、穿透吸附量以及穿透曲线的形状等方面,考察了初始浓度、气速和温度等因素对活性炭吸附性能的影响。另外选择3种不同产地的国产活性炭在相接近的吸附条件下与Calgon活性炭进行对比,结果显示活性炭的微孔分布是与其吸附性能相关性较大的因素。

Dynamic adsorption of Xe on a fixed-bed adsorber at 77 K

In designing a fixed-bed adsorber, it is vital to understand dynamic adsorption properties of the unit. Temperature is an important effect on adsorbent performance, as the dynamic adsorption coefficients tend to increase with decreasing temperature. To minimize the volume of the fixed-bed adsorber, the dynamic adsorption characteristics of Xe were studied at 77 K by employing a variety of adsorbents under different operational conditions. The carbon molecular sieve performed better than that of activated carbon. Both operational conditions and the presence of gaseous impurities were found to affect the adsorption properties.

改性沸石对低浓度氨氮废水的动态吸附

557562采用氯化钠溶液对甘肃白银天然沸石改性，以低浓度氨氮（NH4＋-N）废水为处理对象，对比了天然沸石和改性沸石的动态吸附特性并绘制穿透曲线，利用Origin软件对实验数据分析处理，得出穿透曲线的通式。结果表明：在相同条件下，改性沸石的穿透时间和吸附饱和时间都比天然沸石的长约1．5倍；

软质聚氨酯泡沫塑料对高浓度苯酚的吸附特性

针对苯酚质量分数为4．4073％的酚醛废水，研究了聚氨酯软泡（SPF）对苯酚的静态、动态吸附特性及再生性能。结果表明，常温下动态吸附60mL废水，当pH为2-4,SPF质量为3．8990g时，苯酚去除率为97．53％；