Alternatives for Conventional Alkane Solvents.
Alternatives for Conventional Alkane Solvents.
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传统烷烃溶剂的替代品。
DOI：
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发表时间：
2016
影响因子：
15
通讯作者：
D. Bergbreiter
中科院分区：
文献类型：
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作者：
M. L. Harrell;T. Malinski;Coralys Torres;Kimberly Gonzalez;Jakkrit Suriboot;D. Bergbreiter
本文所述的研究表明，烃低聚物是低分子量烷烃溶剂的替代品。这些低聚溶剂是无毒、非挥发性且可回收的庚烷替代品，可替代使用极性溶剂（例如甲醇、含水乙醇或 DMF）的热定型溶剂混合物或使用乙腈的双相混合物。无论使用哪种极性溶剂，聚（α-烯烃）（PAO）等烃低聚物在极性相中的浸出量都非常低。紫外-可见光谱研究表明这些溶剂具有庚烷的溶解特性。例如，PAO 溶解庚烷可溶性染料，并在热定性溶剂混合物中将它们与极性相定量分离。 PAO 作为纯溶剂或庚烷中的添加剂可充当防浸出剂，减少此类染料在庚烷/极性溶剂混合物中的极性相中的浸出率。在偶氮染料异构化研究中还将这些低聚烃溶剂与庚烷进行了比较。结果表明，偶氮染料在庚烷和 PAO 中以相同的速率发生热异构化。对庚烷和 PAO 中羧酸促进染料异构化的进一步研究表明，低分子量和低聚羧酸在加速这种异构化方面在动力学上是等效的。结果表明，这些和其他烃低聚物的行为就像它们的低分子量非极性烃溶剂一样，并且它们可以成功地替代传统溶剂（例如庚烷）。
The studies described in this paper show that hydrocarbon oligomers are alternatives for low molecular weight alkane solvents. These oligomeric solvents are nontoxic, nonvolatile, and recyclable alternatives to heptane in thermomorphic solvent mixtures that use a polar solvent such as methanol, aqueous ethanol, or DMF or in biphasic mixtures that use acetonitrile. Regardless of which polar solvent is used, hydrocarbon oligomers like poly(α-olefin)s (PAOs) exhibit very low leaching into the polar phase. UV-visible spectroscopy studies show that these solvents have the solubility properties of heptane. For example, PAOs dissolve heptane soluble dyes and quantitatively separate them from polar phases in thermomorphic solvent mixtures. PAOs either as pure solvents or as additives in heptane act as antileaching agents, decreasing the already low leaching of such dyes into a polar phase in heptane/polar solvent mixtures. These oligomeric hydrocarbon solvents were also compared to heptane in studies of azo dye isomerization. The results show that thermal isomerization of an azo dye occurs at the same rate in heptane and a PAO. Further studies of carboxylic acid promoted dye isomerization in heptane and a PAO show that low molecular weight and oligomeric carboxylic acids are kinetically equivalent at accelerating this isomerization. The results suggest that these and other hydrocarbon oligomers behave as solvents like their low molecular weight nonpolar hydrocarbon solvents and that they can be substituted successfully for conventional solvents like heptane.
DOI：
10.1039/c4gc00503a
发表时间：
2014-08-01
期刊：
Green chemistry : an international journal and green chemistry resource : GC
影响因子：
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作者：
Lipshutz BH;Ghorai S
通讯作者：
Ghorai S