Thursday, September 8, 2011

Sub-critical water – Definition

It is an intermediate state of water between normal water and supercritical water. Supercritical water is at a temperature and pressure above its critical point. (temperature >374°C, pressure >221 atm) Subcritical water lies below ranges of the critical points.  So simply it is a stage under supercritical water with controlled temperature and pressure according to the requirement of application.

Sub – critical water can be used as a cheap, non-toxic, non-flammable,  clean solvent in organic chemical research and even commercial applications.


Following research is example usage of sub-critical water as solvent in hydroxymethylfurfural research.


Research: Dehydration of fructose to 5-hydroxymethylfurfural in sub-critical water over heterogeneous zirconium phosphate catalysts by Feridoun Salak and Hiroyuki Yoshida of Osaka Prefecture University.

 

(I am try to make definitions for rare scientific terms and need support for improve the quality of this definitions, please send feedbacks to dilantha[at]chempro[dot]org)

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