The sorption/desorption of gallic acid, a simple phenolic compound, was studied experimentally in a batch system. The motivation for this project was to provide insight into the recovery of phenolic compounds from switchgrass. Recovery of phenolic compounds could enhance the sustainability and economics of biorefining facilities. The sorption/desorption of gallic acid was shown to be qualitatively similar to that of phenolics extracted from switchgrass; so more extensive studies were made using gallic acid as a surrogate for the complex mixtures of phenolic compounds leached from switchgrass. The kinetics indicate that an approximation of equilibrium was reached within 48 h. Activated carbon was demonstrated to sorb gallic acid and phenolics from water and aqueous switchgrass leachate. The loading capacity of activated carbon for the gallic acid–water-activated carbon system increased with temperature for 20 to 60 °C. Ethanol was shown to be a preferable elution agent for desorbing gallic acid from activated carbon. Experimental observations and data from this study provide suitable design information that can be used for preliminary evaluation of conceptual designs of an activated-carbon based packed-bed process for recovery of phenolic compounds from aqueous switchgrass leachate.

中文翻译：

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从柳枝Extract提取物中回收酚类化合物

在间歇系统中，对一种简单的酚类化合物没食子酸的吸附/解吸进行了实验研究。该项目的目的是提供深入了解柳枝switch中酚类化合物回收率的信息。酚类化合物的回收可以提高生物精制设施的可持续性和经济性。没食子酸的吸附/解吸在质量上与从柳枝switch中提取的酚类化合物相似。因此，使用没食子酸作为替代物从柳枝switch中浸出的酚类化合物的复杂混合物进行了更广泛的研究。动力学表明在48小时内达到了平衡的近似值。活性炭被证明可以从水和柳枝switch浸出液中吸收没食子酸和酚类。在20至60°C的温度下，没食子酸-水-活性炭系统的活性炭负载量会增加。乙醇是从活性炭中解吸没食子酸的优选洗脱剂。来自这项研究的实验观察和数据提供了合适的设计信息，这些信息可用于初步评估基于活性炭的填充床工艺的概念设计，该工艺用于从柳枝switch浸出液中回收酚类化合物。