A new reactor for process intensification involving the simultaneous application of adjustable ultrasound and microwave radiation

Ioan Călinescu, Mircea Vinatoru, Daniela Ghimpețeanu, Vasile Lavric, Timothy J. Mason

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)
82 Downloads (Pure)

Abstract

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.

Original languageEnglish
Article number105701
JournalUltrasonics Sonochemistry
Volume77
Early online date3 Aug 2021
DOIs
Publication statusPublished - Sept 2021

Bibliographical note

Funding Information:
The authors acknowledge the financial support received from the Competitiveness Operational Program 2014-2020, Action 1.1.4: Attracting high-level personnel from abroad in order to enhance the RD capacity, project: P_37_471, “ULTRA_MINT Technologies”, financed by contract: 47/05.09.2016.

Publisher Copyright:
© 2021

Keywords

  • Combined reactor
  • Microwave
  • Ultrasound

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Environmental Chemistry
  • Radiology Nuclear Medicine and imaging
  • Acoustics and Ultrasonics
  • Organic Chemistry
  • Inorganic Chemistry

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