Results 261 to 270 of about 6,133,601 (331)

Association of laryngopharyngeal reflux with chronic rhinosinusitis prevalence in adults: A systematic review and meta-analysis.

Biomol Biomed
Xu J, Chen M, Chen G, Lou T, Xu L.
europepmc   +1 more source

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Optimizing reboiler duty and reflux ratio profiles of vapor recompressed batch distillation

Separation and Purification Technology, 2019
Batch distillation columns are more energy inefficient than their continuous analogous. These batch columns commonly operate at a fixed reboiler duty and even reflux ratio. To improve their energetic potential, an attempt is made to optimize the reboiler
S. Parhi, G. P. Rangaiah, A. Jana
semanticscholar   +4 more sources

Vapor recompressed batch distillation: Optimizing reflux ratio at variable mode

Computers & Chemical Engineering, 2019
This work aims at optimizing a vapor recompressed batch distillation that runs at variable reflux mode by employing a multi-objective optimization (MOO) strategy.
S. Parhi, G. P. Rangaiah, A. Jana
semanticscholar   +2 more sources

Influence of reflux ratio on the anaerobic digestion of pig manure in leach beds coupled with continuous stirred tank reactors.

Waste Management, 2019
The effect of reflux ratio on the anaerobic mono-digestion of pig manure (PM) in leach beds coupled with continuous stirred tank reactors (CSTRs) has been studied in this work, and contents of volatile fatty acids (VFAs) and biogas yields were determined
Jie Yang, Dehan Wang, Zifeng Luo, Weishen Zeng   +3 more
semanticscholar   +3 more sources

A constant-reflux-ratio distilling head

Journal of Chemical Education, 1952
An improved constant-reflux-ratio distillation head has been designed that is especially suitable for analytical work involving the fractional distillation of mixtures that boil below 0 degrees C.
G. Miller
semanticscholar   +2 more sources

Batch extractive distillation under constant reflux ratio

Computers & Chemical Engineering, 1994
Abstract The process of batch extractive distillation may provide the advantages of both batch and extractive distillation. So far this process has not been applied at all probably due to its complexity. An algorithm and a computer program were developed for simulating the experiments of a batch extractive distillation process (separation of acetone ...
P. Lang, H. Yatim, P. Moszkowicz, M. Otterbein   +3 more
semanticscholar   +2 more sources

Unusual Control Structure for High Reflux Ratio Distillation Columns

Industrial & Engineering Chemistry Research, 2009
Distillation control wisdom suggests that reflux flow rate should be used to control the reflux-drum level when the reflux ratio is large (>3). In the typical case where a single-end temperature control structure is used, reboiler heat input is used to control a tray temperature at an appropriate location in the column.
W. Luyben
semanticscholar   +2 more sources

An electronic timing device and reflux ratio controller

Journal of the Society of Chemical Industry, 1946
AbstractAn electronic timing device is described, which is designed to operate a magnetically‐controlled reflux dividing head for stills using a total condenser. The timing unit is constructed of readily obtainable radio components and can be assembled by anyone with a good knowledge of electricity.
G. Thacker, B. Walker
semanticscholar   +2 more sources