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以CD650阳离子交换树脂为催化剂,通过三因素Box-Behnken方法设计甲醇和乙酸的模型反应并优化催化酯化反应条件,在最优反应条件下进行生物油和甲醇的催化酯化反应及生物油存储稳定性研究。通过测试空白组、甲醇组和酯化组三组生物油的理化指标发现:存储后酯化组灰分和密度分别为0.1128%和1.1349 g/mL,为各组最低,热值为16.412 MJ/kg,为各组最高。此外,存储后酯化组pH值为2.61,含水率为28.14%(质量分数),运动黏度(40℃)为11.29 mm~2/s,均为各组最低。各组生物油傅里叶变换红外光谱及气相色谱质谱联用分析结果表明,酯化组内酯类成分上升,有机酸含量下降。生物油经催化酯化后品质得到提升。
Using CD650 cation exchange resin as catalyst, the model reaction of methanol and acetic acid was designed by the three-factor Box-Behnken method and the conditions for the esterification reaction were optimized. The catalytic esterification of bio-oil and methanol and the storage of bio-oil under the optimal reaction conditions Stability studies. Through testing the blank group, the physical and chemical indexes of the three groups of bio-oil in the methanol group and the esterification group showed that the ash content and density of the post-esterification group were 0.1128% and 1.1349 g / mL, respectively, which were the lowest in each group with a calorific value of 16.412 MJ / kg , The highest for each group. In addition, the post-esterification group had a pH value of 2.61, a moisture content of 28.14% (mass fraction) and a kinematic viscosity (40 ° C) of 11.29 mm 2 / s, all of which were the lowest in all groups. The results of Fourier transform infrared spectroscopy (FTIR) and gas chromatography-mass spectrometry (GC-MS) of bio-oil in each group showed that the content of esters in the esterified group increased and the content of organic acid decreased. After the bio-oil esterified by the quality of escalation.