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Polyglyme (CAS# 24991-55-7)
Polyethyleneglycol dimethylether (CH2O(CH2CH2O)nOCH3)
An aprotic glycol diether with well extablished use as a gas scrubbing solvent, and as a medium for reactions and separations. Polyglyme is an ethylene oxide based solvent that it is aprotic (no hydroxyl functionality). As a result of its chemical stability, it can function as a solvent in reactions using basic initiators. The high water solubility and high boiling point allow for easy separation from reaction mixtures and recovery. Low VOC by 110C oven test.
Physical Properties
| Empirical Formula |
CnH2n+2On/2 |
| Molecular Weight |
236 |
| Boiling Point (°C 760 mm Hg) |
>275 |
| Freezing Point (°C) |
-28 |
| Specific Gravity (20°C) |
1.03 |
| Vapor Pressure (mm Hg/20°C) |
0.01 |
| Viscosity (cp 20°C) |
12 |
| Auto Ignition temp (°C) |
230 |
| Flash Point (°C, closed cup) |
135 |
| Refractive Index (20°C) |
1.3782 |
Appearance: Clear, slight yellow
Odor: Ethereal, non-residual
Solubility at 25°C
- In water: 100%
- Water in: 100%
% VOC 1hr wt loss in 110C over 0.3g: 6% (236 MW), 4% (274 MW)
Acid Gas Scrubbing
- For removal of H2S and CO2 from natural gas or combustion off-gas
- Available with 236 or 274 Mol. Wt.
Process solvent
- For solvation of polysilicones
- Solvent vehicle for fine chemical syntheses
- Application in cleaning in electronic chips and components
Reaction solvent
- For anionic polymerizations
- Acting as a polymer swelling agent
- Solvent for reactions run under basic conditions
Features
- Aprotic
- High boiling point - for ease of separation from gases and lower boiling liquids
- High solvency characteristics
- Powerful diluent
- 97% Minimum; 1000ppm water max
- Low toxicity
- See MSDS for handling and hazard details