Abstract: A method of combining microscopic and macroscopic analysis was used to evaluate the emulsification characteristics of rice husk py-oil and diesel. At the macroscopic level, emulsifying percentage of py-oil was used as the performance parameter, while the evaluation was based on the average droplet diameter and the density of py-oil particles at the microscopic level. This study focused on the effects of emulsifier types, hydrophilic-lipophilic balance (HLB), storing time, emulsifying temperature, py-oil percentage, and amount of emulsifier on emulsification characteristics of py-oil and diesel. The emulsification results obtained from microscopic and macroscopic analysis were almost the same. Compared with the Span 80-Tween 80 compound emulsifier, the emulsion emulsified by Atlox 4194-DP 2206 compound emulsifier had better stability and py-oil particles distribution. The best HLB of the emulsifier was 4.82. The average droplet diameter and density of py-oil particles changed in the first storing day, but stayed stable after storing for three days. The emulsifying temperature had no effects on the properties of emulsion storing for over one day. As the py-oil percentage increased from 5% to 10%, the properties of emulsion were improved. However, with the further increase of py-oil percentage from 10% to 30%, the properties were decreased. The appropriate range of py-oil percentage was 10%~20%. And the emulsion with 10% py-oil had higher py-oil emulsifying percentage and stability. To guarantee the stability of emulsion and achieve excellent emulsifying results, the ratio of emulsifier and py-oil should be ranged from 0.25 to 0.5. As the ratio was around 0.5, the best emulsification result was achieved and emulsfying percentage of py-oil could maintained above 85%.

Key words: rice husk py-oil, emusifier, emulsifying temperature, emulsification evaluation methods, diesel

摘要： 采用微观和宏观分析相结合的方法，评价稻壳热解油和柴油乳化效果，宏观上以热解油乳化比例为评价依据，微观上以乳化液中热解油液滴的平均粒径和数密度为评价依据，重点研究了乳化剂种类、亲水亲油平衡指数（hydrophilic-lipophilic balance，HLB）、乳化液静置时间、乳化温度、热解油质量分数、乳化剂用量等因素对热解油和柴油乳化效果的影响。研究结果表明：微观和宏观分析法对乳化效果变化规律的评价结果基本一致，评价方法具有较高的准确性。与司班80-吐温80复配乳化剂相比，Atlox 4194-DP 2206复配乳化剂对热解油和柴油混合液的乳化效果更好，且乳化剂的最佳HLB值为4.82。热解油液滴平均粒径和液滴数密度在静置第1天内变化较为明显，在静置时间超过3天后基本保持不变。静置时间超过1天后，乳化温度对乳化液的稳定性和乳化效果没有影响。随热解油质量分数或乳化剂用量的增加，热解油乳化效果先增加后降低，热解油的质量分数范围应在10%~20%间，且质量分数为10%时，热解油乳化效果最好，热解油乳化比例可保持在90%以上；乳化剂与热解油比例的范围应在0.25~0.5，且比例为0.5左右时，乳化效果最佳，热解油乳化比例可稳定在85%以上。

关键词: 稻壳热解油, 乳化剂, 乳化温度, 乳化效果评价方法, 柴油