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INTRODUCTION

TABLE 1

Physical Properties of Methanol (IS 7444)
S. No Property Value
1 Colour Colourless, Water White
2 Boiling point 64.5°C at 760 mmHg
3 Density (g/ml) 0.791 3 at 20°C
4 Hygroscopicity None
Pure material has a slight alcoholic odour.
5 Odour
Other grades may have pungent oily odour.
6 Flash point
• Open Cup 16°C
• Close Cup 12°C
7 Reactivity Not dangerously active
8 Solubility Miscible in all proportions in water
Slightly corrosive to metals especially in
9 Corrosivity presence of moisture. Exceptions – lead and
aluminium
10 Freezing point -97.6°C
11 Vapour density (air=1) 1.11
12 Flammable limits, percent by volume in air at STP 7.3 to 36
13 Vapour pressure at 0°C – 52 mmHg
at 20°C -96 mmHg
at 40°C -253 mmHg
14 Auto – ignition temperature 470°C
15 Refractive Index at 20°C 1.3312
16 Latent heat vaporization 262.8 cal/g at 64.7°C
17 Latent heat of fusion 16.4 cal/g at -97°C

TABLE 1A
Physical Properties of DME
Chemical formula H C-O-CH
3 3
Molecular weight 46.07
Oxygen content by mass 34.8%
CAS Registry Number 115-10-6
Boiling point @ 1 atmosphere -24.825°C
Critical temperature 126.85°C
Critical pressure 5370 kPa
Liquid density @25°C 656.62 kg/m3
Vapour pressure @ 20°C 516.76 kPa

Flammability limits in air by volume % 3.4 – 18

Methanol and DME Production: Survey and Roadmap | 2017 15