Synthesis of Methyl Esters Employing a DBD Plasma Reactor with Liquid-Phase Discharge

IF 2.6 3区物理与天体物理 Q3 ENGINEERING, CHEMICAL

Plasma Chemistry and Plasma Processing Pub Date : 2023-12-20 DOI:10.1007/s11090-023-10435-7

Maíra Oliveira Palm, Paola Nichele Pienta, Diego Alexandre Duarte, Cátia Regina Silva de Carvalho Pinto, Rafael de Camargo Catapan

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Abstract

The use of a dielectric barrier discharge plasma reactor with liquid-phase discharge was investigated in the production of methyl esters by transesterification reaction at room temperature, atmospheric pressure and without any previous reactant stirring step. The effects of applied voltage, reaction time and catalyst content were analyzed on ester production. The transesterification reactions of vegetable oil and monoesters were compared to understand the effect of dielectric barrier discharge plasma on miscible and poorly miscible liquid phases. The power transmitted to the plasma was evaluated for different conditions in order to evaluate the energy expenditure of the plasma reactor in the transesterification reaction and the factors that influence it. Results of the transesterification of vegetable oil were analyzed through sustainability indicators regarding mass productivity, energy consumption and cost of production. The transesterification of monoester showed higher conversion rates when compared to the transesterification of vegetable oil due to the fact that reactants are miscible. The analysis of the power transmitted to the plasma showed that conditions with lower energy expenditure are obtained with more polar solutions and with lower applied voltages to the plasma. Conditions with low plasma applied voltage showed significantly better results in the energy indicators. The results with sustainability indicators suggest that an optimized route using a plasma-assisted catalytic reactor is competitive when compared with conventional reactors for biodiesel production.

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利用液相放电的 DBD 等离子反应器合成甲基酯

摘要研究了在室温、常压和无任何反应物搅拌步骤的条件下，使用介质阻挡放电等离子体反应器进行液相放电，通过酯交换反应生产甲酯的情况。分析了应用电压、反应时间和催化剂含量对酯类生产的影响。对植物油和单酯的酯交换反应进行了比较，以了解介质阻挡放电等离子体对混溶和不太混溶液相的影响。对不同条件下传输到等离子体的功率进行了评估，以评价等离子体反应器在酯交换反应中的能量消耗及其影响因素。通过有关质量生产率、能源消耗和生产成本的可持续性指标，对植物油酯交换反应的结果进行了分析。与植物油的酯交换反应相比，单酯的酯交换反应显示出更高的转化率，这是因为反应物是混溶的。对传输到等离子体的功率进行的分析表明，在极性溶液较多、等离子体施加电压较低的条件下，能量消耗较低。在低等离子体应用电压的条件下，能量指标的结果明显更好。可持续性指标的结果表明，与传统的生物柴油生产反应器相比，使用等离子体辅助催化反应器的优化路线具有竞争力。

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来源期刊

Plasma Chemistry and Plasma Processing 工程技术-工程：化工

CiteScore

5.90

自引率

8.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Publishing original papers on fundamental and applied research in plasma chemistry and plasma processing, the scope of this journal includes processing plasmas ranging from non-thermal plasmas to thermal plasmas, and fundamental plasma studies as well as studies of specific plasma applications. Such applications include but are not limited to plasma catalysis, environmental processing including treatment of liquids and gases, biological applications of plasmas including plasma medicine and agriculture, surface modification and deposition, powder and nanostructure synthesis, energy applications including plasma combustion and reforming, resource recovery, coupling of plasmas and electrochemistry, and plasma etching. Studies of chemical kinetics in plasmas, and the interactions of plasmas with surfaces are also solicited. It is essential that submissions include substantial consideration of the role of the plasma, for example, the relevant plasma chemistry, plasma physics or plasma–surface interactions; manuscripts that consider solely the properties of materials or substances processed using a plasma are not within the journal’s scope.