Ethylene
Name: ethylene
Purity:
99.95%; High purity: 99.999%
Packing specification:
40L cylinder, tank truck
Molecular formula:
C2H4
Structure brief
formula: : CH2=CH2
The simplest form: CH2
Physical properties:
In general, ethylene
is a colorless slightly odorous gas with a density of 1.256g/L, slightly less
dense than air. It is insoluble in water and soluble in organic solvents such
as carbon tetrachloride.
Appearance and
properties: colorless gas, slightly peculiar smell of hydrocarbons. A
small amount of ethylene has a faint sweetness.
Absorption peak: The
absorption zone is in the far ultraviolet region.
Solubility: Insoluble
in water, slightly soluble in ethanol, ketone, benzene, soluble in
ether. Soluble in organic solvents such as carbon tetrachloride.
pH | Neutral | Fusing point(℃) | -169.4 |
Boiling point(℃) | -103.9 | Freezing point | -169.4℃ |
Relative density | 0.00127 | Refractive index | 1.363 |
Relative density(Water=1) | 0.61 | Relative vapour
density (air=1) | 0.99 |
Saturated vapor
pressure(kPa) | 4083.40(0℃) | Heat of
combustion(kJ/mol) | 1411.0 |
Critical
temperature(℃) | 9.2 | Critical
pressure(MPa) | 5.04 |
Flashing point (fp) | 无意义 | Ignition
temperature(℃) | 425 |
Upper explosive
limit %(V/V) | 36.95 | Lower explosive
limit %(V/V) | 2.74 |
Industrial sectorsEthylene
effect:
Application: manufacture of plastics, synthetic ethanol, acetaldehyde,
synthetic fiber and other important raw materials
Ecological field
Triple response of ethylene:
(1) inhibiting stem elongation and growth;
(2) promote the thickening of stem and root;
(3) to promote the lateral growth of the stem. Treating the
yellowing seedling stem with ethylene can make the stem thickened and the
petiole grow upward.
The agricultural field
Ethylene is an endogenous plant hormone produced by all parts of
higher plants, such as leaves, stems, roots, flowers, fruits, tubers, seeds,
and seedlings, under certain conditions. It is the smallest molecule in
plant hormones, and its physiological function is mainly to promote fruit and
cell expansion. The ripening of seeds can promote the shedding of leaves,
flowers and fruits, induce the differentiation of flower buds, break dormancy,
promote germination, inhibit flowering, organ shedding, dwarf plants and
promote the generation of adventitious roots.
