In this paper the mass transfer behaviors of Fe(Ⅲ), Co(Ⅱ) and Ni(Ⅱ) with Cyanex302(bis(2,4,4- trimethylpentyl)monothiophosphinic acid) from sulfate medium by using hollow fiber membrane in counter-currently circula...In this paper the mass transfer behaviors of Fe(Ⅲ), Co(Ⅱ) and Ni(Ⅱ) with Cyanex302(bis(2,4,4- trimethylpentyl)monothiophosphinic acid) from sulfate medium by using hollow fiber membrane in counter-currently circulating operation were studied. The effect of acidity in aqueous solution and the extractant concentration on the mass transfer coefficient (Kw) was discussed. The reaction mechanism of membrane extraction was considered as a false one series reaCtion and the rate controlling step was membrane resistance. When the value of Kw arrived at 1.0 × 10-6 m/s, △pH:CoFe equaled tO 6.225, and △pH:NiFe was bigger than △p HCoFe.展开更多
采用部分偕胺肟化的聚丙烯腈纤维与铁离子反应,形成偕胺肟合铁（Ⅲ）纤维,以此为吸附材料,吸附水溶液中的还原棕染料。研究了其吸附反应条件、吸附规律及吸附反应动力学。结果表明,pH值11.5-12.5、温度60℃和吸附时间60 m in为最佳吸附...采用部分偕胺肟化的聚丙烯腈纤维与铁离子反应,形成偕胺肟合铁（Ⅲ）纤维,以此为吸附材料,吸附水溶液中的还原棕染料。研究了其吸附反应条件、吸附规律及吸附反应动力学。结果表明,pH值11.5-12.5、温度60℃和吸附时间60 m in为最佳吸附反应条件。偕胺肟合铁（Ⅲ）纤维对还原棕的吸附反应符合Langmu ir方程和Freund lich等温吸附经验式。采用不同初始浓度研究吸附时间与溶液浓度的关系,用微分法确定了反应级数和反应速率常数。由不同温度下的速率常数,并结合Arrhen ius方程求出了反应的活化能。结果表明,偕胺肟合铁（Ⅲ）纤维对还原棕的吸附符合一级反应动力学特征,速率方程c=c0e^-kt,速率常数k=32.01e^-Ea/RT,活化能Ea=11.55 kJ/mol。展开更多
基金Supported by the National Natural Science Foundahon of China(No. 29771028, No. 29801004) and State Key Project of Fundamental
文摘In this paper the mass transfer behaviors of Fe(Ⅲ), Co(Ⅱ) and Ni(Ⅱ) with Cyanex302(bis(2,4,4- trimethylpentyl)monothiophosphinic acid) from sulfate medium by using hollow fiber membrane in counter-currently circulating operation were studied. The effect of acidity in aqueous solution and the extractant concentration on the mass transfer coefficient (Kw) was discussed. The reaction mechanism of membrane extraction was considered as a false one series reaCtion and the rate controlling step was membrane resistance. When the value of Kw arrived at 1.0 × 10-6 m/s, △pH:CoFe equaled tO 6.225, and △pH:NiFe was bigger than △p HCoFe.
文摘对比研究了芳纶Ⅲ纤维复合材料、芳纶Ⅲ纤维/T800碳纤维混杂复合材料、T800碳纤维复合材料单向板压缩性能,以及三种状态下缠绕的150 mm容器轴压性能。结果表明:混杂复合材料压缩强度和模量随混杂比(VCF)的增大而增加,当VCF为28.5%时,混杂复合材料单向板压缩强度比芳纶Ⅲ纤维复合材料提高57%,压缩模量提高20.9%;混杂复合材料150mm容器(VCF=46%)轴压破坏载荷达到138.6 k N,比芳纶Ⅲ纤维复合材料150 mm容器的轴压破坏载荷提高18.5%,但仍为混杂负效应。
