Lipase-catalyzed esterification of stearic acid with ethanol, and hydrolysis of ethyl stearate, near the critical point in supercritical carbon dioxide

2002 ◽  
Vol 79 (1) ◽  
pp. 23-27 ◽  
Author(s):  
Hideki Nakaya ◽  
Kozo Nakamura ◽  
Osato Miyawaki
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Stearic Acid ◽  
Critical Point ◽  
Ethyl Stearate ◽  
Hydrolysis Of ◽  
Supercritical Carbon

Numerical Simulation of the Performance of an Axial Compressor Operating With Supercritical Carbon Dioxide

2018 ◽  
Author(s):  
Jinlan Gou ◽  
Wei Wang ◽  
Can Ma ◽  
Yong Li ◽  
Yuansheng Lin ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Numerical Simulation ◽  
Supercritical Carbon Dioxide ◽  
Critical Point ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Axial Compressor ◽  
Brayton Cycle ◽  
Supercritical Carbon

Using supercritical carbon dioxide (SCO2) as the working fluid of a closed Brayton cycle gas turbine is widely recognized nowadays, because of its compact layout and high efficiency for modest turbine inlet temperature. It is an attractive option for geothermal, nuclear and solar energy conversion. Compressor is one of the key components for the supercritical carbon dioxide Brayton cycle. With established or developing small power supercritical carbon dioxide test loop, centrifugal compressor with small mass flow rate is mainly investigated and manufactured in the literature; however, nuclear energy conversion contains more power, and axial compressor is preferred to provide SCO2 compression with larger mass flow rate which is less studied in the literature. The performance of the axial supercritical carbon dioxide compressor is investigated in the current work. An axial supercritical carbon dioxide compressor with mass flow rate of 1000kg/s is designed. The thermodynamic region of the carbon dioxide is slightly above the vapor-liquid critical point with inlet total temperature 310K and total pressure 9MPa. Numerical simulation is then conducted to assess this axial compressor with look-up table adopted to handle the nonlinear variation property of supercritical carbon dioxide near the critical point. The results show that the performance of the design point of the designed axial compressor matches the primary target. Small corner separation occurs near the hub, and the flow motion of the tip leakage fluid is similar with the well-studied air compressor. Violent property variation near the critical point creates troubles for convergence near the stall condition, and the stall mechanism predictions are more difficult for the axial supercritical carbon dioxide compressor.

ChemInform Abstract: Lipase-Catalyzed Enantioselective Hydrolysis of Bicyclo[3.2.0]heptanol Esters in Supercritical Carbon Dioxide.

ChemInform ◽  
2010 ◽  
Vol 28 (34) ◽  
pp. no-no
Author(s):  
O. PARVE ◽  
I. VALLIKIVI ◽  
L. LAHE ◽  
A. METSALA ◽  
UE. LILLE ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Enantioselective Hydrolysis ◽  
Hydrolysis Of ◽  
Supercritical Carbon

The interesterification of edible palm oil by stearic acid in supercritical carbon dioxide

1998 ◽  
Vol 13 (1-3) ◽  
pp. 211-216 ◽  
Author(s):  
Ming-Tsai Liang ◽  
Chun-Hao Chen ◽  
Roo-Chain Liang
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Stearic Acid ◽  
Palm Oil ◽  
Supercritical Carbon

Enhanced Enzymatic Hydrolysis of Sorghum Stalk by Supercritical Carbon Dioxide and Ultrasonic Pretreatment

2018 ◽  
Vol 188 (1) ◽  
pp. 101-111 ◽  
Author(s):  
Qiaozhi Zhang ◽  
Mengjiao Zhao ◽  
Qinqin Xu ◽  
Hongrui Ren ◽  
Jianzhong Yin
Keyword(s):  
Carbon Dioxide ◽  
Enzymatic Hydrolysis ◽  
Supercritical Carbon Dioxide ◽  
Ultrasonic Pretreatment ◽  
Hydrolysis Of ◽  
Supercritical Carbon

Visualization of Supercritical Carbon Dioxide Flow Through a Converging-Diverging Nozzle

2019 ◽  
Author(s):  
Chang Hyeon Lim ◽  
Gokul Pathikonda ◽  
Sandeep Pidaparti ◽  
Devesh Ranjan
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Critical Point ◽  
High Speed ◽  
Operating Conditions ◽  
Higher Plant ◽  
Two Phase ◽  
Pressure Profiles ◽  
Flow Through ◽  
Supercritical Carbon

Abstract Supercritical carbon dioxide (sCO2) power cycles have the potential to offer a higher plant efficiency than the traditional Rankine superheated/supercritical steam cycle or Helium Brayton cycles. The most attractive characteristic of sCO2 is that the fluid density is high near the critical point, allowing compressors to consume less power than conventional gas Brayton cycles and maintain a smaller turbomachinery size. Despite these advantages, there still exist unsolved challenges in design and operation of sCO2 compressors near the critical point. Drastic changes in fluid properties near the critical point and the high compressibility of the fluid pose several challenges. Operating a sCO2 compressor near the critical point has potential to produce two phase flow, which can be detrimental to turbomachinery performance. To mimic the expanding regions of compressor blades, flow through a converging-diverging nozzle is investigated. Pressure profiles along the nozzle are recorded and presented for operating conditions near the critical point. Using high speed shadowgraph images, onset and growth of condensation is captured along the nozzle. Pressure profiles were calculated using a one-dimensional homogeneous equilibrium model and compared with experimental data.

Reaction kinetics of hydrothermal hydrolysis of hesperidin into more valuable compounds under supercritical carbon dioxide conditions

2012 ◽  
Vol 66 ◽  
pp. 215-220 ◽  
Author(s):  
Duangkamol Ruen-ngam ◽  
Armando T. Quitain ◽  
Masahiro Tanaka ◽  
Mitsuru Sasaki ◽  
Motonobu Goto
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Reaction Kinetics ◽  
Valuable Compounds ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Supercritical Carbon
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