Accession Number : ADA294933

Title :   The Relationship of Chemical Structure to Supercritical-Fluid Solubility and to Cosolvent-Modifier Properties: A Literature Review.

Descriptive Note : Final rept. Sep 92-Sep 94,

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Schroeder, M. A. ; Fifer, R. A. ; Morris, J. B.

PDF Url : ADA294933

Report Date : JUN 1995

Pagination or Media Count : 70

Abstract : This report describes a literature review on solubility and cosolvent effects in supercritical fluid extraction (SFE). A cosolvent modifier is a second solvent that is added, usually in small (<10%) amounts, to a supercritical solvent to enhance the solubility of a solute in that solvent. In general, nonpolar solvents such as ethane tend to most efficiently dissolve nonpolar solutes such as hydrocarbons, while more polar solvents such as CHF3 tend to most efficiently dissolve more polar solutes. Supercritical carbon dioxide (SF-CO2) is a fairly good general solvent. With regard to cosolvent effects, the main correlation seems to be that in order for addition of a given cosolvent to cause a large increase in the solubility of a given solute, there should be a specific interaction (e.g., hydrogen bonding, charge transfer, dipole-dipole interaction, etc.) between the solute and the cosolvent involved. The behavior of HMX and RDX in supercritical fluid chromatography (SFC) and SFE behavior are also summarized. Finally, some suggestions are made as to possible ways of enhancing the extractability of HMX and RDX in supercritical solvents. jg

Descriptors :   *SOLVENTS, *SUPERCRITICAL FLOW, *SOLUBILITY, POLARIZATION, RECYCLED MATERIALS, HYDROGEN BONDS, LITERATURE SURVEYS, INTERACTIONS, PHASE TRANSFORMATIONS, HIGH TEMPERATURE, EXPLOSIVES, GASES, PROPELLANTS, CORRELATION, SOLUTES, HYDROCARBONS, CHARGE TRANSFER, EXTRACTION, FLUIDS, MOLECULAR STRUCTURE, CARBON DIOXIDE, POLARITY, ETHANES, RDX, GUN PROPELLANTS, CHROMATOGRAPHY, HMX, RECLAMATION.

Subject Categories : Physical Chemistry
      Inorganic Chemistry
      Organic Chemistry
      Fluid Mechanics
      Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE