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Intensified Transformation of Low-Value Residual Fuel Oil to Light Fuels with TPABr:EG as Deep Eutectic Solvent with Dual Functionality at Moderate Temperatures
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-03-27 , DOI: 10.1021/acs.energyfuels.9b04486 Marjan Razavian 1 , Shohreh Fatemi 1
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-03-27 , DOI: 10.1021/acs.energyfuels.9b04486 Marjan Razavian 1 , Shohreh Fatemi 1
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The performance of two deep eutectic solvents (DESs) was comparatively inspected in upgrading of heavy residual fuel oil (Mazut) as a chemical additive at different processing temperatures and times of 300–350 °C and 105–420 min, respectively. DESs consisted of ethylene glycol possessing hydrogen-donating groups and tetrapropylammonium bromide (TPABr) or choline chloride (ChCl) possessing alkyl tails with different lengths. Characterization of upgraded liquids processed at 325 °C for 210 min showed that TPABr:EG was three times more effective than ChCl:EG in asphaltene conversion and produced a lighter fuel with higher maltene selectivity. Besides the asphaltene reduction (36%), it was more efficient in desulfurization, with a 12.8% reduction, than dry thermal upgrading, with 5.8% asphaltene and 1.9% sulfur reductions, respectively. Moreover, upgraded oil from the TPABr:EG-incorporated scenario revealed high stability toward regression, and viscosity was well preserved after 3 months. Aside from viscosity measurement, asphaltene determination, elemental CHNS, FTIR, and TGA analyses on upgraded oils, isolated asphaltenes from TPABr:EG-incorporated and dry thermal processes were further characterized by FTIR and NMR to pursue the upgrading events. It was realized that TPABr:EG boosted the structural changes in heavy asphaltenic islands by fragmentation and dealkylation of the heteromacromolecular rings. In fact, it intensified both side aliphatic chain shortening and aromatic core shrinkage appreciably compared to the dry thermal process. On the basis of all of the findings elucidating the dual radical generation and hydrogen donation functionality of TPABr:EG, a mechanism is proposed to shed light on the pathway of influence of this eutectic mixture in the intensification of upgrading heavy oil.
中文翻译：
使用TPABr：EG作为中等温度下具有双重功能的深层共溶剂的低价残油强化转化为轻质燃料
分别在300-350°C和105-420 min的不同加工温度和时间下，比较了两种深共熔溶剂（DESs）在重质重质燃油（Mazut）作为化学添加剂的提质中的性能。DES由具有供氢基团的乙二醇和具有不同长度烷基尾的四丙基溴化铵（TPABr）或胆碱氯化物（ChCl）组成。在325°C下处理210分钟的提纯液体的表征表明，TPABr：EG在沥青质转化中的效率是ChCl：EG的三倍，并且可以生产出具有更高的麦芽选择性的轻质燃料。除了减少沥青质（36％）外，其脱硫效率比干法热提质要低12.8％，而干法热提质分别减少5.8％和1.9％硫。此外，掺有TPABr：EG的情景中的升级版油显示出对回归的高度稳定性，并且3个月后粘度得到了很好的保存。除了粘度测量，沥青质测定，对提质油的元素CHNS，FTIR和TGA分析以外，还通过FTIR和NMR对来自TPABr：EG结合的干法和干法热过程中分离出的沥青质进行了表征，以进行提质事件。已经认识到，TPABr：EG通过杂大分子环的断裂和脱烷基作用促进了重质沥青质岛的结构变化。实际上，与干热法相比，它显着增强了脂族侧链的缩短和芳族核的收缩。基于所有发现，阐明了TPABr：EG的双自由基产生和氢捐赠功能，
更新日期：2020-03-27
中文翻译：
使用TPABr：EG作为中等温度下具有双重功能的深层共溶剂的低价残油强化转化为轻质燃料
分别在300-350°C和105-420 min的不同加工温度和时间下，比较了两种深共熔溶剂（DESs）在重质重质燃油（Mazut）作为化学添加剂的提质中的性能。DES由具有供氢基团的乙二醇和具有不同长度烷基尾的四丙基溴化铵（TPABr）或胆碱氯化物（ChCl）组成。在325°C下处理210分钟的提纯液体的表征表明，TPABr：EG在沥青质转化中的效率是ChCl：EG的三倍，并且可以生产出具有更高的麦芽选择性的轻质燃料。除了减少沥青质（36％）外，其脱硫效率比干法热提质要低12.8％，而干法热提质分别减少5.8％和1.9％硫。此外，掺有TPABr：EG的情景中的升级版油显示出对回归的高度稳定性，并且3个月后粘度得到了很好的保存。除了粘度测量，沥青质测定，对提质油的元素CHNS，FTIR和TGA分析以外，还通过FTIR和NMR对来自TPABr：EG结合的干法和干法热过程中分离出的沥青质进行了表征，以进行提质事件。已经认识到，TPABr：EG通过杂大分子环的断裂和脱烷基作用促进了重质沥青质岛的结构变化。实际上，与干热法相比，它显着增强了脂族侧链的缩短和芳族核的收缩。基于所有发现，阐明了TPABr：EG的双自由基产生和氢捐赠功能，
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