What does volatilization mean in organic chemistry?

The volatilization rate of a solvent can be expressed in two ways. One is that the volatilization time of the unit mass of ether is 1, and the ratio of the volatilization time of the unit mass of other solvents to the volatilization time of the ether is the volatilization rate of the solvent. The second method is butyl acetate for a certain period of time.

The volatile mass is 100, which is expressed by comparing the volatilized mass of other solvents in the same time. Due to the different representation methods, the larger the value with the first method, the slower the volatilization; The second method is that the higher the value, the faster the evaporation. The two evaporation rates can be expressed by the following formula.

Ether method: volatilization rate = (evaporation time of the tested solvent) (evaporation time of ether of the same weight).

Butyl acetate method: volatilization rate = (mass of the tested solvent volatilized in the same time 100) (mass of butyl acetate volatilized in the same time).

1. Alias English name.

dimethyl methyl ketone, azeton, acetone; acetone、dimethyl ketone、propanone。

2. Uses: It is used for the refining of organic solvents, acetic anhydride, chloroform, dyes, paraffin, rubber, and lubricating oil.

3. Physical properties.

Molecular Weight: Melting Point: A94-6

Boiling Point: 56-48

Liquid density (15): 797 2kg m3

Gas density: 2 00kg m3

Compressibility coefficient (14 2, 90 l 79 3699 38kpa): 0 00011 l

Critical temperature: 236 5

Critical pressure: 4782 54kpa

Critical density: 278kg m3

Heat of gasification (0): 563 79kJ kg

Specific heat capacity (gas, 26 110, 101 325kpa): cp=1452 37j (kg k)

Vapor pressure (39-5): 53-33kpa

25℃)：30．17kpa

Viscosity (gas, 0): 0 00725 mpa s

Liquid, 0): 0 4013 mpa s

Surface tension (acetone - air or vapor, 0): 26-2mn m

Thermal conductivity (0, gas): 0 0096338w (m k).

0, liquid): 0 177702w (m k).

Refractive index: 1 3585

Flash Point: A 17 78

Ignition Point: 465

**Boundary: 2 6% to 12 8%.

Maximum Pressure:

The concentration at which the maximum ** pressure is generated:

Maximum flammability concentration: 4 5

Heat of combustion (liquid, 25): 1791 62kj/mo1

Toxicity Level: 1

Flammability Class: 3

Explosiveness level: 0

Acetone is a volatile colorless transparent liquid with a special aromatic odor at room temperature pressure. It is flammable, and its vapor air can form a first-class mixture, which is easy to cause combustion in case of open flame or high heat. The chemical properties are more reactive.

Its liquid is lighter than water. It can be dissolved with water, alcohol, ether, chloroform, acetylene, oil and hydrocarbons, and can dissolve grease and rubber. Acetone vapor has an anesthetic effect.

It is usually used to indicate the vapor pressure of a pure substance (liquid or solid) at a certain temperature. Substances with higher vapor pressure are called volatile matter; The lower ones are called involatile matter. For mixtures where the components are miscible together, the ratio of the volatility of the two components is called the relative volatility.

Relative volatility: It is customary to refer to the ratio of the volatility of volatile components in a solution to the volatility of difficult volatile components, which is called relative volatility. Represented by .

Volatility: The ratio of the vapor partial pressure of a component in the gas phase to the molar fraction of the component in the liquid phase in equilibrium, expressed by symbols.

According to the WHO definition, volatile organic compounds (VOCs) refer to various organic compounds with a boiling point of 50 to 260 at room temperature. According to its chemical structure, VOCs can be further divided into: alkanes, aromatics, esters, aldehydes and others.

More than 300 species have been identified. The most common are benzene, toluene, xylene, styrene, trichloroethylene, chloroform, trichloroethane, diisocyanate (TDI), diisocyantoluene, etc. o Nope?

Volatiles are substances that are gases at room temperature.