Energy saving in a biodiesel production process based on self-heat recuperation technology

Abstract

Acid-catalyzed biodiesel production processes offer a competitive alternative for biodiesel production using waste cooking oil as raw materials and are less complex than alkalicatalyzed approaches. However, acid-catalyzed biodiesel processes are not yet commercialized because of high energy requirements, especially for the recovery of excess methanol and purification of the biodiesel and glycerol. We have developed an advanced biodiesel production process with energy savings through application of self-heat recuperation technology for methanol recovery and biodiesel and glycerol purification. Both the sensible and latent waste heat were recirculated within the proposed process, significantly reducing energy requirements. Simulation showed that the total energy requirement of the proposed process was 378.7 kWh per ton biodiesel, some 71% lower than that of the conventional biodiesel production process.

Optimization of Biodiesel Production from Waste Cooking Oil Using Waste Eggshell as a Base Catalyst under a Microwave Heating System

“…Hence, the biodiesel production was analyzed and calculated in relation to the preliminary quantity of waste cooking oil by weight. This was also found in comparable studies [39,48,49].…”

“…These outcomes show that even if extra catalyst might increase the biodiesel yield (production), the volume of glycerin yield is similarly improved as a result of saponification, instigating a further decrease of biodiesel synthesis. A further increase in catalyst absorption did not affect the catalyst performance on biodiesel yield, but it then resulted in further expenses attributed to its inference from the reaction intermediate at the peak of the procedure [3,39]. Moreover, Sirisomboonchai et al resolved that the accumulation of an inconsistent quantity of alkali catalyst intensifies the creation of a suspension, which increases stickiness and causes the gels' formation [34].…”

Energy-aware manufacturing operations

“…Indeed, despite the fact that this is a widespread approach in specific industries, such as chemical/process industry, few works consider the possibility of re-injecting energy waste into the system (e.g. waste generated from heat losses during machining) (Fu et al 2015), even in manufacturing. Research activities that aim at translating in manufacturing systems ideas and developments from these experiences should be dealt with in the near future.…”

Amendoim (Arachis sp.) como fonte na matriz energética brasileira

“…6 Nesse contexto, o biodiesel é uma alternativa atraente porque, além de ser renovável, atende à demanda ambiental pela redução de emissão de poluentes. 7 A produção de biocombustíveis a partir de biomassa depende de dois principais fatores. Em primeiro lugar, a disponibilidade de matéria-prima para o biocombustível e, segundo, o processo adotado para produzir biocombustível.…”

“…9 O biodiesel pode ser obtido a partir de vários óleos vegetais 4 ou de gordura animal, por transesterificação, em presença de álcoois de cadeias curtas e de catalisador básico, ácido ou enzimático dando origem a monoésteres de ácidos graxos e glicerina. 7 As fontes renováveis representam hoje 43,8% da matriz energética nacional. A entrada desse novo combustível no mercado nacional vai gerar uma grande economia para o país, com a redução nas importações do diesel de petróleo.…”