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Combined Reaction-Separation Processes in CO_2

机译：CO_2中反应分离的联合过程

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Production of hydrogen peroxide and recovery of platinum group metals (PGM's) represent good application targets for the CO_2-technology. Hydrogen peroxide is currently produced via the sequential hydrogenation and oxidation of a 2-alkyl anthraquinone. Recovery of PGM's include leaching of the metals from the crushed ore using HC1 / Cl_2 biphasic mixture at elevated pressure, followed by selective extraction of the metal chloride species, recovery and reduction of the zero-valent metal. In each of these processes, the use of CO_2 as the sole process solvent ameliorates several environmental and engineering problems including (a) eliminating the contamination of the product during its recovery by liquid-liquid extraction into water, (b) optimizing throughput via elimination of mass transport limitations, which also reduces energy input. We have generated functionalized anthraquinones (FAQ's) and CO_2-philic chelating agents that are miscible with carbon dioxide, thus making it possible to run the processes in liquid CO_2. Not only is the use of CO_2 as a solvent a green route to hydrogen peroxide manufacture or recovery of PGM's, but it is also economically feasible owing to the ability to recover the product without employing a large pressure drop, ready recycling of the functionalized anthraquinones or the chelating agents, and operation at relatively low absolute pressure due to special characteristics of the phase behavior of the CO_2-philic compound.
机译：过氧化氢的产生和铂族金属（PGM's）的回收代表了CO_2技术的良好应用目标。当前，过氧化氢是通过2-烷基蒽醌的顺序氢化和氧化产生的。 PGM的回收包括在高压下使用HC1 / Cl_2两相混合物从破碎矿石中浸出金属，然后选择性提取金属氯化物，回收并还原零价金属。在这些工艺中的每一种中，使用CO_2作为唯一的工艺溶剂都会改善一些环境和工程问题，包括（a）通过液-液萃取到水中来消除产品回收过程中对产品的污染；（b）通过消除溶剂来优化产量大众运输的局限性，这也减少了能量输入。我们已经生成了可以与二氧化碳混溶的功能化蒽醌（FAQ）和亲CO_2螯合剂，因此可以在液态CO_2中运行该过程。使用CO_2作为溶剂不仅是生产过氧化氢或回收PGM的绿色途径，而且由于能够在不使用大压降的情况下回收产物，可将功能化的蒽醌或四氢呋喃或四氢呋喃迅速回收的能力，因此在经济上也是可行的。螯合剂，并且由于亲CO_2化合物的相行为的特殊特性，可以在相对较低的绝对压力下操作。

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