Two-Stage Clathrate Hydrate/Membrane Process for Precombustion Capture of Carbon Dioxide and Hydrogen

A hybrid process for the capture of CO2 and H2 from a treated fuel gas mixture is presented. It consists of two hydrate crystallization stages operating at 273.7?K and 3.8 and 3.5?MPa, respectively. The CO2-lean stream from the first stage is directed to a membrane separation unit whereas the CO2-rich one is directed to the second hydrate stage. These operating pressures at the crystallization stages are possible by adding 2.5% by mole propane. Propane enables the reduction in the hydrate formation pressure and thus reduces the cost associated with the compression of the fuel gas. The two hydrate stages would operate at 7.5 and 3.5?MPa without adding propane. This work provides the relevant kinetic data, as well as the separation efficiency and recoveries achieved.     

Completely removing vanadium from ammonium molybdate solution using chelating ion exchange resins

Some chelating resins were used to remove a small amount of V (0.35 g/L V₂O₅) from ammonium molybdate solution with Mo concentration around 90 g/L. The results showed that vanadium can be easily extracted over molybdenum from ammonium molybdate solution by DDAS, CUW or CW-2 resins. More than 99.5% V and less than 0.27% Mo was extracted with a contact time of 60 min at pH = 7.4 and ambient temperature. The effluent was pure ammonium molybdate solution with a Mo/V gram ratio of more than 50,000 from an initial 255. Stripping of loaded resin was excellent using 5% ammonia solution, with a maximum V concentration of 20 g/L in comparison to 0.8 g/L Mo in the eluate. The mechanism for adsorption of V from ammonium molybdate solution by chelating resins was also proposed.     

气相色谱法浓缩氘的研究

采用气相色谱技术建立了一套含氚重水氘浓缩的演示实验装置,用氘-氢（D-H）体系进行实验,结果表明,装置实现了长期、连续、安全的运行。D浓度为O．1％的样品经装置浓缩后得到D浓度为30％的产品,贫化部分D浓度小于10^-5;D浓度为10％的样品经装置浓缩后得到D浓度大于90％的产品。装置对D-H体系的处理容量达到40m%3/d。     

Overview of SOI materials technology in China

In recent years, novel structure SOI materials have been fabricated successfully. Also, SiGeOI （SGOI） material, an ideal substrate for realizing strained-silicon structures, has been investigated by modified SIMOX technology. From 2002, the 100 mm, 125 mm and 150 mm SIMOX wafers have been successfully produced by Shanghai Simgui Technology Co. Ltd, a commercial spin-off of Shanghai Institute of Microsystem and Information Technology （SIMIT）, Chinese Academy of Sciences （CAS）, and shipped to the semiconductor industry worldwide. This paper presents an outlook for R ＆ D on SOI technologies, and the recent status and future prospect of SIMOX wafers in China.     

超临界流体技术的研究和应用

阐述了超临界流体在近20年来的研究发展过程及其在工农业中的应用。对超临界流体的萃取、超临界体系相平衡、超临界化学反应和超临界流体技术等研究及应用等领域,以及超临界流体技术的最新研究开发作综述。得出“超临界流体的研究在未来的世界中具有着广阔的应用前景”的结论。同时还指出了对超临界流体的反应研究需要解决的一些问题。     

超临界CO_2流体萃取大豆油的研究与数值模拟

本文建立了一套超临界流体萃取的实验装置 ,在压力为 2 0MPa～ 30MPa ,温度为30 8K～ 32 3K的条件下 ,研究了用超临界二氧化碳萃取大豆油。试验证明用超临界流萃取的方法可以较为完全地得到大豆中的油分。基于固定床、积分柱塞流与微分混合流的假设建立了理论计算模型 ,使用这个模型可以根据装料量少耗时短的微分萃取试验结果来较为准确地计算出相同条件下积分萃取的过程。经本试验结果比较证明该方法简便可行 ,在本文条件下误差小于 6 % ,是对超临界流体萃取放大研究的一种探索     

植物多糖的分离纯化与制备

多糖具有很高的药用价值。由于植物多糖的种类繁多,提取制备方法各有不同。本就植物多糖的理化性质、当前不同种类植物多糖的常规分离纯化方法和膜分离制备方法的最新研究成果,进行了系统地综述。     

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我国煤层气资源十分丰富,但其利用率极低,这主要是因为抽放煤层气中的有效成分甲烷浓度低。因此对煤层气中甲烷的分离提纯极为重要。混合气中各组分在共同吸附时具有竞争性,在这变压吸附过程中直接影响到混合气中各组分的吸附和解吸。文章通过模拟煤层气（CH4／N2）的吸附过程,从理论上分析了混合气体吸附过程中各组分在游离相和吸附相的浓度变化特征及其对吸附分离的影响。最后讨论了抽放煤层气中其他组分对所要提纯组分CH4的影响。     

石油亚砜PSO3e萃取Au~(3+)的性能及机理研究

研究了石油亚砜PSO3e萃取Au3+时 ,萃取剂浓度、盐酸浓度对萃取率的影响。实验结果表明 ,在实验条件下 ,金的萃取率随着PSO3e的浓度和HCl的浓度增加而增加。还通过研究其它因素如Au3+、Cl- 、H+、PSO3e的浓度对分配系数的影响 ,确定萃合物的组成为HAuCl4·3PSO·mH2 O。此外 ,根据红外光谱研究萃取物的成键情况 ,得出PSO3e萃取Au3+的机理为酸性缔合机理 :H+3PSO(o) +mH2 O +AuCl4- 〔H·3PSO·mH2 O·AuCl4〕(o)     

干法变性温度对淀粉糊化及混合浆相分离的影响

通过比较不同温度处理过的淀粉试与原淀粉的Brabender粘度曲线,探讨了变性淀粉浆料干法生产过程中反应温度与淀粉糊化特性之间的联系,然后以初显分离时间和沉降率为量化指标,定量评估了该温度对淀粉与PVA－1799及VPA－1788混合浆液相分离的影响,实验结果表明,提高变性淀粉浆料干法生产过程中的反应温度,有助于降低淀粉的糊化温度和浆液粘度,并能减小淀粉与PVA混合浆液的初始相分离速度。