A new reactor for process intensification involving the simultaneous application of adjustable ultrasound and microwave radiation
Open accessAbstract
Ultrasound (US) and Microwaves (MW) are effective methods for processes intensification. Their combined use in the same reactor can lead to remarkable results. Recently there has been a resurgence of interest in this field for new synthetic applications using reactors based upon existing technologies. We describe here a new type of apparatus in which the thermal energy is continuously removed from the system making possible the use of high power and adjustable ultrasonic and microwave densities throughout the process. The installation consists of a glass reactor located in a monomode applicator which is immersed at the same time in an ultrasonic device which can be operated at different frequencies and powers. A liquid, transparent to microwaves, was used to couple ultrasonic energy to the reactor and to remove the heat generated. Comsol software was used to get information about the distribution of ultrasonic and microwave energy between the reactor liquid and the coupling fluid. The performance was assessed using the conversion of p-nitrophenol into 4-nitrocatechol as a chemical dosimeter and a transesterification.
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Emerging extraction technologies such as UAE, MAE, and SFE aim to address the limitations of traditional methods by offering reduced extraction time, lower solvent consumption, improved extraction rates, and enhanced extract quality.
“These cutting-edge techniques aim to address the limitations of traditional methods by offering advantages like reduced extraction time, lower solvent consumption, improved extraction rates, and enhanced extract quality.”
From A comprehensive review of ultrasonic assisted extraction (UAE) for bioactive components: Principles, advantages, equipment, and combined technologies (2023) · cites this paper as [5]
The Introduction describes ultrasound and microwaves as process-intensification methods associated with faster reactions and improved products; the Conclusions identify plant extraction and reduced degradation of heat-sensitive compounds as potential applications. The paper does not address SFE or establish the claimed reductions in extraction time and solvent use, or improvements in extraction rate and extract quality across these techniques. The cited passages provide no page numbers. (LLM, conf=0.85)
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“By efficiently, economically, and environmentally friendly extracting bioactive components from the complex matrix of plants, these innovative extraction technologies have revolutionized the field of extraction [5].”
BackgroundOprescu, E.-E., Enascuta, C.-E., Radu, E., Ciltea-Udrescu, M., & Lavric, V. (2022) · Chemical Engineering and Processing - Process Intensification · doi:10.1016/j.cep.2022.109082 · Cited by 20 · see citing works
Self-citation
- Authors
- Călinescu, I., Vinatoru, M., Ghimpețeanu, D., Lavric, V., & Mason, T. J.
- Affiliations
- Universitatea Națională de Știință și Tehnologie Politehnica București (RO)
- Coventry University (GB)
- Venue
- Ultrasonics Sonochemistry
- Publisher
- Elsevier BV
- Published
- 2021-09
- Volume
- 77
- Pages
- 105701
- ISSN
- 1350-4177 (ISSN-L)
- PMC
- PMC8358197
- OpenAlex
- W3188328564
- Cited by
- 37
- References
- 32
- Citations by year
- 2026: 6 · 2025: 5 · 2024: 11 · 2023: 7 · 2022: 7 · 2021: 1
- FWCI
- 1.97
- Type
- journal article
- Language
- en
- Update notices
- erratum (2024-12-01)
- Open access
- gold
- doi.org
- Licence
- Locations
- Ultrasonics Sonochemistry (publishedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- Pure (Coventry University) (publishedVersion, cc-by-nc-nd)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Ultrasound and Cavitation Phenomena
- Physical Sciences › Chemistry › Organic Chemistry › Microwave-Assisted Synthesis and Applications
- Physical Sciences › Engineering › Biomedical Engineering › Innovative Microfluidic and Catalytic Techniques Innovation
- Keywords
- process intensification, ultrasound, microwave irradiation, heat removal, energy distribution, 4-nitrophenol reduction, 4-nitrocatechol, transesterification, chemical dosimeters
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