Continuous Acid-Catalyzed Methylations in Supercritical Carbon Dioxide: Comparison of Methanol, Dimethyl Ether and Dimethyl Carbonate as Methylating Agents

2010 ◽  
Vol 14 (2) ◽  
pp. 411-416 ◽  
Author(s):  
Peter N. Gooden ◽  
Richard A. Bourne ◽  
Andrew J. Parrott ◽  
Han S. Bevinakatti ◽  
Derek J. Irvine ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Dimethyl Ether ◽  
Dimethyl Carbonate ◽  
Acid Catalyzed ◽  
Methylating Agents ◽  
Supercritical Carbon

Synthesis of dimethyl carbonate from methanol and supercritical carbon dioxide

2006 ◽  
Vol 32 (8) ◽  
pp. 737-747 ◽  
Author(s):  
Seung Tae Hong ◽  
Hyung Sang Park ◽  
Jong Sung Lim ◽  
Youn-Woo Lee ◽  
Masakazu Anpo ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Dimethyl Carbonate ◽  
Supercritical Carbon

scholarly journals Synthesis of dimethyl carbonate in supercritical carbon dioxide

2006 ◽  
Vol 23 (1) ◽  
pp. 111-116 ◽  
Author(s):  
D. Ballivet-Tkatchenko ◽  
R. A. Ligabue ◽  
L. Plasseraud
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Dimethyl Carbonate ◽  
Supercritical Carbon

scholarly journals Oxidative Carbonylation of Methanol to Dimethyl Carbonate in Ionic Liquid 1-Butyl-3-Methylimidazolium Hexafluorophosphate

2003 ◽  
Vol 2003 (9) ◽  
pp. 549-551 ◽  
Author(s):  
Tao Jiang ◽  
Buxing Han ◽  
Guoying Zhao ◽  
Yanhong Chang ◽  
Liang Gao ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquid ◽  
Supercritical Carbon Dioxide ◽  
Room Temperature ◽  
Dimethyl Carbonate ◽  
Room Temperature Ionic Liquid ◽  
Oxidative Carbonylation ◽  
Enhanced Selectivity ◽  
Supercritical Carbon

The synthesis of dimethyl carbonate (DMC) by oxidative carbonylation of methanol with PdCl2 as a catalyst was investigated in the room temperature ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]). The products were recovered in situ using supercritical carbon dioxide. Enhanced selectivity of DMC over this catalyst was observed in the synthesis in [bmim][PF6] compared with the situation without the ionic liquid (IL). The mixture of catalyst and [bmim][PF6] could be recycled.

scholarly journals Enhancement of Lipid Extraction from Soya Bean by Addition of Dimethyl Ether as Entrainer into Supercritical Carbon Dioxide

Foods ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1223
Author(s):  
Hideki Kanda ◽  
Yuji Fukuta ◽  
Wahyudiono ◽  
Motonobu Goto
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Dimethyl Ether ◽  
Neutral Lipids ◽  
Lipid Extraction ◽  
Operating Pressure ◽  
Supercritical Carbon Dioxide Extraction ◽  
Ether Extraction ◽  
Carbon Dioxide Extraction ◽  
Supercritical Carbon

Soya beans contain a variety of lipids, and it is important to selectively separate neutral lipids from other lipids. Supercritical carbon dioxide extraction has been used as an alternative to the selective separation of neutral lipids from soya beans, usually using non-polar hexane. However, supercritical carbon dioxide extraction has a high operating pressure of over 40 MPa. On the other hand, liquefied dimethyl ether extraction, which has attracted attention in recent years, requires an operating pressure of only 0.5 MPa, but there is concern about the possibility of an explosion during operation because it is a flammable liquefied gas. Therefore, this study aims to reduce the operating pressure by using a non-flammable solvent, supercritical carbon dioxide extraction mixed with liquefied dimethyl ether as an entrainer. The extraction rate and the amount of neutral lipids extracted increased with increasing amounts of added liquefied dimethyl ether. In the mixed solvent, the amount of neutral lipids extracted was higher at an operating pressure of 20 MPa than in pure supercritical carbon dioxide extraction at 40 MPa. The mixing of liquefied dimethyl ether with supercritical carbon dioxide allowed an improvement in the extraction of neutral lipids while remaining non-flammable.

High pressure routes to dimethyl carbonate from supercritical carbon dioxide

Tetrahedron ◽  
1999 ◽  
Vol 55 (40) ◽  
pp. 11949-11956 ◽  
Author(s):  
Neil S Isaacs ◽  
Brian O'Sullivan ◽  
Carla Verhaelen
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Supercritical Carbon Dioxide ◽  
Dimethyl Carbonate ◽  
Supercritical Carbon
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