稻壳热解油的提质
发布时间：2019-07-05 20:01
【摘要】：生物油具有p H值低、粘度高、热值低、含氧量高及腐蚀性强等特点,限制了其作为燃料直接使用,需要对其提质。生物油提质的方法主要有物理法和化学法。本文主要运用物理法中的乳化法和添加溶剂等方法对生物油进行提质,选取稻壳热解油为原料,离心分离得轻质油和重质油,然后分别进行提质。轻质油与0#柴油在复配乳化剂(司盘80和吐温80)作用下进行乳化,运用单因素实验探索乳化条件,亲水亲油平衡值(HLB)值、温度、时间、转速和助乳化剂等对乳化油稳定性的影响。实验得到优化条件为:HLB值等于7、温度为40 oC、乳化时间为5 min、转速为15000 rpm和助乳化剂/复配乳化剂质量比为0.04。此乳化条件下制取的乳化油稳定时间为384 h。选取萃取剂三辛胺、助溶剂仲辛醇和稀释剂石油醚作为萃取相,萃取轻质油中的酸性组分以提高乳化油的p H值,采用单因素和正交实验对萃取实验优化,得出优化的萃取实验条件是:v(三辛胺)/v(仲辛醇)/v(石油醚)的比例为4:1:5、相比为1:0.6、温度为30 oC、超声时间为2 min、萃取后生物油p H值为4.21,而萃取率仅为1.81%。萃取后得到的乳化油稳定时间为358 h。重质油因粘度过大,不能与0#柴油直接进行乳化,本文选择醇解的方法,催化醇解重质油后再进行乳化。在180 oC下、700 oC煅烧的Ca(CH3COO)2催化醇解重质油组分。醇解油被检测出的化合物主要有酚、醇、酮、醛和酸,含量最多的是酚类,为64.10%。选择醇解油与甲醇的质量比分别为1:3、1:2、1:1、2:1、3:1以及无甲醇配制成调制油,调制油与0#柴油在复配乳化剂(司盘80、司盘85和吐温80)作用下进行乳化。探索不同的HLB值对乳化油油稳定性的影响。其中,m(醇解油)/m(甲醇)=1:1时,HLB值等于7,稳定时间可以达到96.27 h。对稳定性较好的一组乳化油进行闪点、燃点、密度、粘度、p H值、热值的和腐蚀特性的测定,其性能接近柴油指标。
文内图片：
图片说明：乳化油分层前后图片
[Abstract]:Bio-oil has the characteristics of low pH value, high viscosity, low calorific value, high oxygen content and strong corrosion, which limits its direct use as fuel and needs to be improved. The main methods of improving the quality of biological oil are physical method and chemical method. In this paper, the emulsification method and solvent addition method in physical method are used to improve the quality of bio-oil. Rice husk pyrolysis oil is selected as raw material, light oil and heavy oil are separated by centrifugation, and then the quality improvement is carried out respectively. Light oil and 0 # diesel oil were emulsified under the action of compound emulsifier (Span 80 and Twin 80). The effects of emulsification conditions, hydrophilic lipophilic equilibrium value (HLB), temperature, time, rotating speed and auxiliary emulsifier on the stability of emulsified oil were investigated by single factor experiment. The experimental results show that the HLB value is equal to 7, the emulsification time is 40 oC, the emulsification time is 5 min, the rotating speed is 15000 rpm, and the mass ratio of auxiliary emulsifier to compound emulsifier is 0.04. The stable time of emulsion oil prepared under this emulsification condition is 384 h. The extractant trioctylamine, cosolvent secondary octanol and diluent petroleum ether were selected as extraction phases to extract acidic components from light oil to increase the pH value of emulsified oil. Single factor and orthogonal experiments were used to optimize the extraction experiment. The optimum extraction conditions were as follows: v (trioctylamine) / v (secondary octanol) / v (petroleum ether) ratio was 4 鈮，
本文编号：2510769
文内图片：
图片说明：乳化油分层前后图片
[Abstract]:Bio-oil has the characteristics of low pH value, high viscosity, low calorific value, high oxygen content and strong corrosion, which limits its direct use as fuel and needs to be improved. The main methods of improving the quality of biological oil are physical method and chemical method. In this paper, the emulsification method and solvent addition method in physical method are used to improve the quality of bio-oil. Rice husk pyrolysis oil is selected as raw material, light oil and heavy oil are separated by centrifugation, and then the quality improvement is carried out respectively. Light oil and 0 # diesel oil were emulsified under the action of compound emulsifier (Span 80 and Twin 80). The effects of emulsification conditions, hydrophilic lipophilic equilibrium value (HLB), temperature, time, rotating speed and auxiliary emulsifier on the stability of emulsified oil were investigated by single factor experiment. The experimental results show that the HLB value is equal to 7, the emulsification time is 40 oC, the emulsification time is 5 min, the rotating speed is 15000 rpm, and the mass ratio of auxiliary emulsifier to compound emulsifier is 0.04. The stable time of emulsion oil prepared under this emulsification condition is 384 h. The extractant trioctylamine, cosolvent secondary octanol and diluent petroleum ether were selected as extraction phases to extract acidic components from light oil to increase the pH value of emulsified oil. Single factor and orthogonal experiments were used to optimize the extraction experiment. The optimum extraction conditions were as follows: v (trioctylamine) / v (secondary octanol) / v (petroleum ether) ratio was 4 鈮，
本文编号：2510769
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