苯甲酸及其衍生物在亚临界水中的降解。

Degradation of benzoic acid and its derivatives in subcritical water.

机构信息

Department of Chemistry, East Carolina University, Greenville, NC 27858, USA.

出版信息

J Chromatogr A. 2011 Apr 15;1218(15):2146-52. doi: 10.1016/j.chroma.2010.08.054. Epub 2010 Sep 16.

DOI:10.1016/j.chroma.2010.08.054

PMID:20846661

Abstract

In this research, the stability of benzoic acid and three of its derivatives (anthranilic acid, salicylic acid, and syringic acid) under subcritical water conditions was investigated. The stability studies were carried out at temperatures ranging from 50 to 350°C with heating times of 10-630 min. The degradation of the benzoic acid derivatives increased with rising temperature and the acids became less stable with longer heating time. The three benzoic acid derivatives showed very mild degradation at 150°C. Severe degradation of benzoic acid derivatives was observed at 200°C while their complete degradation occurred at 250°C. However, benzoic acid remained stable at temperatures up to 300°C. The degradation products of benzoic acid and the three derivatives were identified and quantified by HPLC and confirmed by GC/MS. Anthranilic acid, salicylic acid, syringic acid, and benzoic acid in high-temperature water underwent decarboxylation to form aniline, phenol, syringol, and benzene, respectively.

摘要

在这项研究中，研究了苯甲酸及其三种衍生物（邻氨基苯甲酸、水杨酸和丁香酸）在亚临界水中的稳定性。稳定性研究在 50 至 350°C 的温度范围内进行，加热时间为 10 至 630 分钟。随着温度的升高，苯甲酸衍生物的降解增加，并且随着加热时间的延长，酸的稳定性降低。在 150°C 时，三种苯甲酸衍生物表现出非常温和的降解。在 200°C 时观察到苯甲酸衍生物的严重降解，而在 250°C 时则完全降解。然而，苯甲酸在高达 300°C 的温度下保持稳定。通过 HPLC 鉴定和定量了苯甲酸和三种衍生物的降解产物，并通过 GC/MS 进行了确认。在高温水中，邻氨基苯甲酸、水杨酸、丁香酸和苯甲酸经历脱羧作用，分别形成苯胺、苯酚、丁香酚和苯。