吡啶 工业级桶装氮苯助染变性剂通用杂环化合物 金属缓蚀剂批发

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Function and Use

Appearance and Properties

Colorless or slightly yellow liquid with a foul odor.
Melting point (℃): -41.6
Boiling Point (℃): 115.3
Relative density (water=1): 0.9827
Refractive Index: 1.5067 (25°C)
Relative vapor density (air = 1): 2.73
Saturation vapor pressure (kPa): 1.33/13.2°C
Flash Point (℃): 17
Ignition Temperature(℃): 482
Heat of combustion (constant pressure) (KJ/mol): 2826.51
(KJ/mol): 2782.97
Specific Heat Capacity (21°C, Constant Pressure) (KJ/kg.K): 1.64
Critical Temperature (℃): 346.85
Critical Pressure (MPa): 6.18
Conductivity (25°C) (μS/cm): 4
Thermal Conductivity (20°C) (W/m·K): 0.182
Viscosity (15°C) (mPa·S): 1.038
(20℃) (mPa·S): 0.952
(30℃) (mPa.S): 0.829
Boiling Heat (25℃) (KJ/mol): 40.4277
Heat of fusion (KJ/mol): 7.4133
Heat Generation (Liquid) (KJ/mol): 99.9808

Chemical properties
Pyridine and its derivatives are more stable than benzene, and their reactivity is similar to that of nitro groups. Typical aromatic electrophilic substitution reactions occur at positions 3 and 5, but their reactivity is lower than that of benzene, and they generally do not undergo nitration, halogenation, sulfonation, and other reactions. Pyridine is a weak tertiary amine; in an ethanol solution, it can form water-insoluble salts with various acids, such as... Industrially used pyridine contains about 1% 2-methylpyridine, which allows for the separation of pyridine from its homologues by exploiting the difference in salt formation properties. Pyridine can also form crystalline complexes with various metal ions. Pyridine is more susceptible to reduction than benzene; for example, it can be reduced to hexahydropyridine (also known as...) under the action of... and ethanol. When pyridine reacts with..., it can be easily oxidized to N-oxypyridine.

Application Approaches
In addition to serving as a solvent, pyridine is also used in industry as a starting material for the synthesis of a variety of products, including pharmaceuticals, disinfectants, dyes, food flavors, adhesives, and more.
Pyridine can also be used as a catalyst, but the dosage must not be excessive, otherwise it will affect the quality of the product.
Used as a corrosion inhibitor, pyridine has a corrosion inhibition effect on metals, utilizing its adsorption properties to achieve this purpose.

Derivative Products
Many derivatives of pyridine are important medications, some of which are essential components of vitamins or enzymes. A derivative of pyridine is an anti-tuberculosis drug, and 2-methyl-5-vinylpyridine is a raw material for synthetic rubber.