Continuous flow through a microwave oven for the large-scale production of biodiesel from waste cooking oil

Tangy, Alex; Pulidindi, Indra Neel; Perkas, Nina; Gedanken, Aharon

doi:10.1016/j.biortech.2016.10.068

Cited by 86 publications

(27 citation statements)

References 43 publications

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“…Although microwave was found to be more effective, ultrasound is deemed safer and more convenient. Nonetheless, research is ongoing to overcome the challenges related to microwave exposure and process limitations, such as the limited depth of microwave penetration, and non-uniform heating at a large scale [46].…”

Section: Sonochemical Leaching Of Metalsmentioning

confidence: 99%

A Review of the Application of Ultrasound in Bioleaching and Insights from Sonication in (Bio)Chemical Processes

Vyas

Ting

2017

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Chemical and biological leaching is practiced on a commercial scale for the mining of metals from ores. Although bioleaching is an environmentally-friendly alternative to chemical leaching, one of the principal shortcomings is the slow rate of leaching which needs to be addressed. The application of ultrasound in bioleaching, termed sonobioleaching, is a technique which has been reported to increase the rate and extent of metal extraction. This article reviews efforts made in the field of sonobioleaching. Since bioleaching is effectively a biological and chemical process, the effects of sonication on chemical leaching/reactions and biological processes are also reviewed. Although sonication increases metal extraction by increasing the metabolite production and enhanced mixing at a micro scale, research is limited in terms of the microorganisms explored. This paper highlights some shortcomings and limitations of existing techniques, and proposes directions for future research.

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Section: Sonochemical Leaching Of Metalsmentioning

confidence: 99%

A Review of the Application of Ultrasound in Bioleaching and Insights from Sonication in (Bio)Chemical Processes

Vyas

Ting

2017

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“…The use of WCO represents a double benefit that makes it a very good environment-friendly feedstock. First, it is cheaper than virgin vegetable oils and second, it can be re-used and transformed, preventing their discarding into the sewer that it causes water pollution and the cost increase of water treatment [6].…”

Section: Introductionmentioning

confidence: 99%

Bioconversion of crude glycerol from waste cooking oils into hydrogen by sub-tropical mixed and pure cultures

Rodrigues

Nespeca

Sakamoto

et al. 2019

International Journal of Hydrogen Energy

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This study compared the biohydrogen generation by subtropical mixed and pure cultures from the crude glycerol from the biodiesel production using waste cooking oils (WCO). The crude glycerol was pretreated by pH adjustment. The mixed culture was obtained from a subtropical granular sludge of the UASB (Upflow Anaerobic Sludge Blanket) reactor used in the treatment of vinasse from sugarcane of ethanol and sugar industry. It was heat treated in order to inactivate hydrogen-consuming bacteria, which was identified by Illumina MiSeq Sequencing with a relative abundance of 97.96% Firmicutes Philum, 91.81% Clostridia Class and 91.81% Clostridiales Order. The pure culture was isolated from a subtropical granular sludge from UASB reactor of treating brewery wastewater and identified as Enterobacter sp. (KP893397). Two assays were carried in anaerobic batch reactors in order to verify the hydrogen production from crude glycerol bioconversion with: (I) mixed culture and (II) pure culture. The experiments were conducted at 37 C, initial pH of 5.5 for assay I and 7.0 for assay II, with 20 g COD L À1 of crude glycerol. The crude glycerol consumption was 56.2% and 88.0% for the assay I and II, respectively. The hydrogen yields were 0.80 moL H 2 mol À1 glycerol for the assay I and 0.13 moL H 2 mol À1 glycerol for the assay II. Enterobacter sp. preferred the reductive metabolic route, generating 1460.0 mg L À1 of 1,3-propanediol, and it showed to be more sensitive in the presence of methanol from crude glycerol than mixed culture that preferred the oxidative metabolic route with biohydrogen generation. The mixed culture was more able to generate H 2 than pure culture from the crude glycerol coming from the biodiesel production using WCO.

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“…Such systems were expected to become powerful tools in organic synthesis [18]. Indeed, there have been several reports on organic synthesis in this context such as Pd-catalyzed C-C bond formations [20][21][22][23][24], biodiesel synthesis [25][26][27][28][29] and others [30][31][32][33], using a flow-type MW device. Flow-type MW heating in a microcapillary reactor has also been utilized in various reactions [34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

A continuous-flow resonator-type microwave reactor for high-efficiency organic synthesis and Claisen rearrangement as a model reaction

et al. 2018

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We have developed a single-mode microwave reactor for continuous-flow synthesis with various methods of operation. This device measures the resonant frequency and modulates the oscillation frequency accordingly to maintain the maximum electric field intensity in the cavity. It can be operated either using constant applied irradiation power or using new programs which change the electric power (E-GRA) and change the flow rate (Fl-GRA), in order to rapidly screen various reaction conditions. As a model reaction, the Claisen rearrangement reaction of allyl 1-naphthyl ether 1 was rapidly optimized in this device, affording the desired product 2-allylnapthalen-1-ol 2 in high (91%) yield and up to 20 g/h productivity.

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Continuous flow through a microwave oven for the large-scale production of biodiesel from waste cooking oil

Cited by 86 publications

References 43 publications

A Review of the Application of Ultrasound in Bioleaching and Insights from Sonication in (Bio)Chemical Processes

A Review of the Application of Ultrasound in Bioleaching and Insights from Sonication in (Bio)Chemical Processes

Bioconversion of crude glycerol from waste cooking oils into hydrogen by sub-tropical mixed and pure cultures

A continuous-flow resonator-type microwave reactor for high-efficiency organic synthesis and Claisen rearrangement as a model reaction

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