Pyridine, an organic compound with the chemical formula C5H5N, is a six-membered heterocyclic compound containing a nitrogen heteroatom. It can be regarded as a compound in which one (CH) in the benzene molecule is substituted by N, so it is also called nitrobenzene. It is a colorless or slightly yellow liquid with a stench.
Foreign name: pyridine
Alias: Azabenzene
Chemical formula: C5H5N
Molecular weight: 79.102
CAS login number: 110-86-1
EINECS accession number: 203-809-9
Melting point: -41.6 ℃
Boiling point: 15.3℃
Water soluble: Soluble
Density: 0.983 g/cm³
Exterior: Colorless liquid
Flash point: 20 ℃ (closed)
Application: Used in the manufacture of vitamins, sulfonamides, pesticides and plastics, etc.
Security description: S7; S16; S22; S24/25; S26; S28; S36/37/39; S38; S45; S61
Hazard Symbols: F; Xn
Hazard description: R11; R20/21/22
UN Dangerous Goods Number: 1282
Physical properties:
Melting point: -41.6℃
Boiling point: 115.3℃
Flash point: 20℃
Density: 0.983g/cm3
Ignition temperature: 482℃
Upper explosion limit (V/V): 12.4%
Lower explosion limit (V/V): 1.7%
Critical temperature (℃): 346.85
Critical pressure (MPa): 6.18
Refractive index: 1.509 (20℃)
Appearance: colorless liquid
Solubility: Miscible with water, alcohol, ether, petroleum ether, benzene, oil and other solvents
Chemical properties:
Pyridine and its derivatives are more stable than benzene, and their reactivity is similar to that of nitrobenzene. Typical aromatic electrophilic substitution reactions occur at the 3 and 5 positions, but the reactivity is lower than that of benzene, and nitration, halogenation, sulfonation and other reactions are generally not easy to occur. Pyridine is a weak tertiary amine that can form water-insoluble salts with various acids (picric acid or perchloric acid, etc.) in ethanol solution. The pyridine used in industry contains about 1% of 2-methylpyridine, so it can be separated from its homologues by taking advantage of the difference in salt-forming properties. Pyridine can also form crystalline complexes with various metal ions. Pyridine is easier to reduce than benzene, such as reducing to hexahydropyridine (or piperidine) under the action of metal sodium and ethanol. Pyridine reacts with hydrogen peroxide and is easily oxidized to N-pyridine oxide.
Application
It is used in the manufacture of vitamins, sulfonamides, pesticides and plastics; it can also be used as an alkaline solvent, and it is also an excellent solvent for deacidification and acylation reactions; it can also be used as a carbonyl group for polymerization, oxidation, and acrylonitrile. It can also be used as a catalyst for chemical reactions, etc.; it can also be used as a silicone rubber stabilizer, a raw material for anion exchange membranes, etc.
3-Bromopyridine,4-Methoxypyridine,Intermediates 2-Chloro-3-formyl-6-picoline,5-Bromo-2-methyl-3-nitropyridine Fuxin Custchem Fine Chemical Co., Ltd. , https://www.custchemvip.com
Vacuum and pressure combined air pumps specially used for paper feeder of printing and packaging machie, such as Heidelberg, Manroland, KBA, Komori, Mistubishi, etc.
Character:
1, Capacity: 60m3/h, 80m3/h, 100m3/h, 140m3/h,250m3/h
2, Supply -60kPa vacuum and 60kPa pressure at same time
3, Use carbon graphite vane to supply pure air
4, Low temperature rising
5, Low noise
6, Convenient maintenance
Maintenance guarantee period: 12 months after shipping
Packaging: Wooden case
Delivery: Normally 2 weeks after receiving payment
Main Application:
Sheet-fed offset press Folding Machine
Package Printing Equipment Paper Envelope Machine
Paper Converting Equipment Paper Cutting Machine
Elliptical Binding line Hydraulic Press Cutting Machine
Paper Collating Machine Envelope Window Film Sticking Machine
Binding and Package Production Equipment
Laser Inmaging and Laser Typesetter Machine
Wood processing machine
Food and medicinal packaging machine
ItemUnit
ZBW 60F
ZBW 80F
ZBW 140F
ZBW250G
Capacity(m 3 /h)M 3 /h
60
80
100
250
(Rated Pressure)
kPa
Â
Â
Â
Â
(Rated vacuum)
kPa
-85
-85
-85
-85
(Supplement Vacuum)
kPa
Â
Â
Â
Â
(Motor rating)
Kw
2.2
3.0
4
7.5
(Motor speed)
r/min
1420
1420
1420
1440
Noise level
dB(A)
70
72
75
79
Temperature-rise
 degr.
70
70
Â
Â
Dia.of connting pipe
Mm
M27×2
M20×1.5
M27×2M33×2
M27×2
M33×2Φ34
G 3/4
G1 1/1
G1 3/4
(Weight)
Kg
84
94
116
133
(××)Overall dimensions(mm)
mm
788×405×350
808×405×350
965×405×350
1031×405×350