Immobilised photosensitisers for continuous flow reactions of singlet oxygen in supercritical carbon dioxide

2011 ◽  
Vol 2 (6) ◽  
pp. 1059 ◽  
Author(s):  
Xue Han ◽  
Richard A. Bourne ◽  
Martyn Poliakoff ◽  
Michael W. George
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Singlet Oxygen ◽  
Continuous Flow ◽  
Supercritical Carbon

scholarly journals Continuous-flow Heck synthesis of 4-methoxybiphenyl and methyl 4-methoxycinnamate in supercritical carbon dioxide expanded solvent solutions

2013 ◽  
Vol 9 ◽  
pp. 2886-2897 ◽  
Author(s):  
Phei Li Lau ◽  
Ray W K Allen ◽  
Peter Styring
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Methyl Acrylate ◽  
Heck Reaction ◽  
Continuous Flow ◽  
Flow Reactor ◽  
Product Distribution ◽  
Internal Diameter ◽  
Palladium Metal ◽  
Supercritical Carbon

The palladium metal catalysed Heck reaction of 4-iodoanisole with styrene or methyl acrylate has been studied in a continuous plug flow reactor (PFR) using supercritical carbon dioxide (scCO2) as the solvent, with THF and methanol as modifiers. The catalyst was 2% palladium on silica and the base was diisopropylethylamine due to its solubility in the reaction solvent. No phosphine co-catalysts were used so the work-up procedure was simplified and the green credentials of the reaction were enhanced. The reactions were studied as a function of temperature, pressure and flow rate and in the case of the reaction with styrene compared against a standard, stirred autoclave reaction. Conversion was determined and, in the case of the reaction with styrene, the isomeric product distribution was monitored by GC. In the case of the reaction with methyl acrylate the reactor was scaled from a 1.0 mm to 3.9 mm internal diameter and the conversion and turnover frequency determined. The results show that the Heck reaction can be effectively performed in scCO2 under continuous flow conditions with a palladium metal, phosphine-free catalyst, but care must be taken when selecting the reaction temperature in order to ensure the appropriate isomer distribution is achieved. Higher reaction temperatures were found to enhance formation of the branched terminal alkene isomer as opposed to the linear trans-isomer.

ChemInform Abstract: Diaryl Ether Synthesis in Supercritical Carbon Dioxide in Batch and Continuous Flow Modes.

ChemInform ◽  
2009 ◽  
Vol 40 (8) ◽  
Author(s):  
Jin-Kyun Lee ◽  
Matthew J. Fuchter ◽  
Rachel M. Williamson ◽  
Gary A. Leeke ◽  
Edward J. Bush ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Continuous Flow ◽  
Diaryl Ether ◽  
Ether Synthesis ◽  
Supercritical Carbon

scholarly journals Retraction: Synthesis of Cu 2 ZnSnS 4 Micro‐ and Nanoparticles via a Continuous‐Flow Supercritical Carbon Dioxide Process

ChemSusChem ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3940-3940
Author(s):  
Michael J. Casciato ◽  
Galit Levitin ◽  
Dennis W. Hess ◽  
Martha A. Grover
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Continuous Flow ◽  
Supercritical Carbon

Strategies for cleaner oxidations using photochemically generated singlet oxygen in supercritical carbon dioxide

2009 ◽  
Vol 11 (11) ◽  
pp. 1787 ◽  
Author(s):  
Xue Han ◽  
Richard A. Bourne ◽  
Martyn Poliakoff ◽  
Michael W. George
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Singlet Oxygen ◽  
Supercritical Carbon

Inactivation of the microbiota and effect on the quality attributes of pineapple juice using a continuous flow ultrasound-assisted supercritical carbon dioxide system

2018 ◽  
Vol 24 (7) ◽  
pp. 547-554 ◽  
Author(s):  
I Paniagua-Martínez ◽  
A Mulet ◽  
MA García-Alvarado ◽  
J Benedito
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Vitamin C ◽  
High Power ◽  
Continuous Flow ◽  
Quality Attributes ◽  
Power Ultrasound ◽  
Pineapple Juice ◽  
High Power Ultrasound ◽  
Supercritical Carbon

Supercritical carbon dioxide inactivation technology represents a promising nonthermal processing method, as it causes minimum impact on the nutritional food properties. The aim of this study was to analyze the combined effect of supercritical carbon dioxide and high-power ultrasound on the inactivation of natural microbiota and the quality attributes of pineapple juice treated in a continuous flow system. Different juice residence times (3.06–4.6 min), at 100 bar and 31.5 ℃, were used. The results indicated that the microbiota inactivation was complete and the differences obtained in the quality attributes (2.2% for pH, 4.8% for °Brix, 2% for vitamin C) were minimal. During storage, microorganisms were not able to recover and the vitamin C decrease could be limited to 8.2% after four weeks. The results demonstrated that the supercritical carbon dioxide–high-power ultrasound technique could be an excellent alternative for the cold pasteurization of pineapple juice.

Diaryl ether synthesis in supercritical carbon dioxide in batch and continuous flow modes

2008 ◽  
pp. 4780 ◽  
Author(s):  
Jin-Kyun Lee ◽  
Matthew J. Fuchter ◽  
Rachel M. Williamson ◽  
Gary A. Leeke ◽  
Edward J. Bush ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Continuous Flow ◽  
Diaryl Ether ◽  
Ether Synthesis ◽  
Supercritical Carbon
Sign in / Sign up

Export Citation Format

Share Document