Production of H2O2 in CO2 and its use in the direct synthesis of propylene oxide

被引:52
作者
Beckman, EJ [1 ]
机构
[1] Univ Pittsburgh, Dept Chem Engn, Pittsburgh, PA 15261 USA
关键词
D O I
10.1039/b300387f
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Hydrogen peroxide is generally considered to be a green oxidant, as it is relatively non-toxic and breaks down in the environment to non-toxic by-products. However, the current method for production, the sequential hydrogenation and oxidation of an alkyl anthraquinone, is capital-intensive, produces significant volumes of waste, and consumes sizeable quantities of energy during the purification and concentration of the product. We have designed CO2-soluble catalysts, and have successfully generated H2O2 from H-2 and O-2 in carbon dioxide-water mixtures. The use of CO2 as solvent allows for use of reasonable concentrations of H-2 and O-2 without danger of explosion, and homogeneous catalysis eliminates diffusional limitations to reaction. Although aqueous hydrogen peroxide is an important product in its own right, H2O2 is also a benign intermediate for a variety of oxidation reactions. We have shown that H2O2 generated in situ from H-2 and O-2 in CO2 cleanly epoxidizes propylene to propylene oxide (PO). PO is currently produced either via the chlorohydrin route, which produces two pounds of waste per pound of PO, or via one of several "peroxidation" processes, where a co-product must be produced with the desired PO and hence waste volumes and energy requirements are much higher than desired. Because those factors that render the current AQ process for H2O2 less than green also contribute to its relatively high cost, generation of H2O2 from H-2 and O-2 in CO2 not only permits green synthesis of an important commodity, but also opens other applications for use of this green oxidant.
引用
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页码:332 / 336
页数:5
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