Li Jian, Wang Qing, Tao Junyu, Yan Beibei, Chen Guanyi
School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
Tianjin Engineering Center of Biomass-Derived Gas and Oil/Tianjin Key Lab of Biomass/Wastes Utilization/Key Lab of Biomass-Based Oil and Gas (China Petroleum and Chemical Industry Federation), Tianjin 300072, China.
ACS Omega. 2020 Jul 30;5(31):19579-19588. doi: 10.1021/acsomega.0c02050. eCollection 2020 Aug 11.
Biomass tar is the bottleneck of biomass gasification, which not only is adverse to energy production but also brings severe environmental issues. A scrubber with vegetable oil is considered as a low-cost but efficient approach for tar removal, but the effects of oil's properties on different tar absorptions were rarely reported. In this study, canola oil, palm oil, and pure oleic acid and linoleic acid, which are the main compounds of vegetable oils, were employed for absorptive removal of benzene, toluene, and phenol. The degree of unsaturation, average molecular weight, and average chain length of solvents were quantitatively characterized. A series of time and temperature-dependent absorption experiments were conducted, and the relationship between oils' properties and absorption performances was built. Results showed that pure oleic acid had the biggest absorption capacity for benzene and toluene due to the mono-unsaturated structure. Increasing the average molecular weight and chain length also enhanced tar absorption. Moreover, Grey relative analysis was employed to investigate the influence of each factor on tar absorption. The average molecular weight exerted the most significant influence on tar absorption in the tested temperature range whose comprehensive relevance coefficients reached the highest at 0.9810, 0.7669, and 0.7739 for benzene, toluene, and phenol, respectively. This study puts more attention on the nature of vegetable oils, and we hope to provide useful information for modulating a better oil-based scrubber medium and further enhancing tar absorptive removal.
生物质焦油是生物质气化的瓶颈，它不仅不利于能源生产，还带来严重的环境问题。植物油洗涤器被认为是一种低成本且高效的焦油去除方法，但油的性质对不同焦油吸收的影响鲜有报道。在本研究中，菜籽油、棕榈油以及植物油的主要成分纯油酸和亚油酸被用于吸附去除苯、甲苯和苯酚。对溶剂的不饱和度、平均分子量和平均链长进行了定量表征。进行了一系列与时间和温度相关的吸收实验，并建立了油的性质与吸收性能之间的关系。结果表明，由于单不饱和结构，纯油酸对苯和甲苯的吸收能力最大。增加平均分子量和链长也能增强焦油吸收。此外，采用灰色关联分析研究了各因素对焦油吸收的影响。在测试温度范围内，平均分子量对焦油吸收的影响最为显著，其综合关联度系数分别在苯、甲苯和苯酚的吸收中达到最高，分别为0.9810、0.7669和0.7739。本研究更加关注植物油的性质，希望为优化更好的油基洗涤器介质和进一步提高焦油吸附去除提供有用信息。
