Acetals
Acetals
Acetals
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
L A M B I O T T E & C I E S. A.<br />
M E T H Y L A L<br />
Description<br />
Molecular formula C 3<br />
H 8<br />
O 2<br />
Chemical structure CH 3<br />
-O-CH 2<br />
-O-CH 3<br />
Synonym<br />
Dimethoxymethane (DMM)<br />
CAS N° 109-87-5<br />
EINECS N° 203-714-2<br />
INCI name<br />
Methylal<br />
Physical Properties<br />
Molecular weight 76.08<br />
Density (g/cm 3 ) 20°C 0.861<br />
Vapour density 2.6<br />
Boiling point (°C) 101 325 Pa 42.3<br />
Freezing point (°C) -104.8<br />
Flash point (°C)<br />
Closed cup (Pensky-Martens) -18<br />
Open cup (Cleveland) -18<br />
Vapour pressure (bar) 20°C (ASTM D 323 modified) 0.40<br />
Kinematic viscosity (10 -7 m 2 /s) 25°C 3.71<br />
Refractory index η 20 D 1.3531<br />
Explosion limits (Vol%)<br />
LEL 20 : 2.2<br />
UEL 20 : 19.9<br />
Autoignition temperature (°C) (ASTM E 659) 237<br />
Surface tension (mN/m) 25°C 21.20<br />
Evaporation rate compared to<br />
Diethyl ether (=1) 1.36<br />
(Following DIN 53170)<br />
Butyl acetate (=1) 0.11<br />
Solubility of the acetal in water (%) 32.3<br />
Solubility of water in the acetal (%) 4<br />
Solvent power<br />
Kauri-butanol index (ASTM D 1133-90) measured with gum 4938 101<br />
gum 4939 164<br />
Solubility parameters (MPa 1/2 )<br />
Hildebrand: Total δ 18.24<br />
Hansen: Dispersion δ d 14.83<br />
Polarity δ p 6.01<br />
Hydrogen bond δ h 8.76<br />
Azeotropes<br />
% Weight % Weight B.P. temperature (°C) Pressure (Pa)<br />
Methylal<br />
98.70<br />
Methylal<br />
91.80<br />
Water<br />
1.30 42 101 320<br />
Methanol<br />
8.20 41.85 101 320
Change language