Physico-chemical properties

 

Physical data of liquid gas

Propan

n-Butan

Gas density at 15 ° C in kg / l

0,51

0,58

Gas density at 0 ° C 1 bar in kg / l

1,97

2,59

The ratio of density to air
(air = 1)

1,55

2,09

Specific volume in liquid state 1 kg of liquid gas 0 ° C in l

1,88

1,68

Specific volume in liquid state 1 kg of liquid gas 15 ° C in l

1,96

1,72

Volume of 1 kg of gas (in the case of 1 bar) at 0 ° C in l

508

373

The volume of 1 kg of gas (in the case of 1 bar) at 15 ° C in l

535

393

Steam pressure in bars, overpressure of 20 ° C

7,353

1,089

Steam pressure in bars, overpressure 0 ° C

3,703

0,059

Steam pressure in bars, overpressure -10 ° C

2,424

- 0,289

Boiling point in ° C at 1.013 bar

- 42

- 0,5

Evaporation heat at 0 ° C kJ / kg

378,58

383,86

Calorific value (lower calorific value) kWh / kg

12,87

12,69

Calorific value (higher calorific value) kWh / kg

13,98

13,74

Wobbe number for H, kWh

20,79

23,74

 Maximum combustion temperature: air ° C
oxygen ° C

1925
2850

1895
2850

Flashpoint of air

510

430

Explosion limits (air) 0 vol. % of gas

2 - 9,5

1,5 - 8,5

Max. Flame propagation velocity cm / s

47,2

45,2

Theoretical air requirement (Lmin) m3n/m3n,

24,36

32.308

Theoretical oxygen demand m3n/m3n,

5,104

6,769

Quantity of burnt gas, wet conditions  m3n/m3n

26,244

34,709

The amount of gas burned, dry conditions m3n/m3n

22,3

29,68

Dewpoint temperature of combustion products

55

55

Carbon dioxide up to (%)

13,8

14,1