lodine Crystals/Pharmaceutical Grade | high Purity/ COAS 7553-56-2

Iodine
Properties
Melting point
113°C (lit.)
Boiling point
184°C (lit.)
Density
1.32 g/mL at 25°C
Bulk density
2100 kg/m³
Vapor density
9 (vs air)
Vapor pressure
0.31 mmHg (25°C)
Flash point
<10℃
Storage condition
Store at RT.
Solubility
Miscible with chloroform, carbon tetrachloride, carbon disulfide, cyclohexane, methanol, ethyl acetate, toluene, benzene, n‑hexane, butanediol, bromoethane, n‑heptane, glycerol and diethyl ether.
Form
Round pellets
Color
Reddish‑brown
Specific gravity
4.93
Odor
Sharp characteristic odor
pH
5.4 (H₂O, saturated solution)
Resistivity
1.3E15 μΩ‑cm
Water solubility
0.3 g/L (20ºC)
Crystal structure
Rhombic
Merck
14,5014
BRN
3587194
Henry's Law Constant
2.8×10⁻² mol/(m³·Pa) at 25℃
Exposure Limits
ACGIH: TLV‑TWA 0.01 mg/m³, as I, Inhalable particulate matter
OSHA: PEL‑Ceiling 0.1 ppm (1 mg/m³)
NIOSH: REL‑Ceiling 0.1 ppm
Cosmetic functional properties
‑ Antimicrobial agent
InChI
InChI=1S/I2/c1‑2
InChIKey
PNDPGZBMCMUPRI‑UHFFFAOYSA‑N
SMILES
II
LogP
2.49 at 20℃
CAS
7553‑56‑2
NIST Chemical Information
Iodine (7553‑56‑2)
EPA Chemical Information
Iodine (7553‑56‑2)
Application & Synthesis
Description
Iodine is a non‑metallic halogen element. Elemental iodine exists as purplish‑black lustrous crystals, which can sublime slowly. Its vapor exhibits purple color with pungent odor.
It is slightly soluble in water and prone to hydrolysis to form weakly acidic solution. It shows good solubility in multiple organic solvents. Solution color varies in different solvents due to solvation effect.
Chemically, iodine acts as mild oxidizing agent in acidic aqueous medium. It can react with diverse metals, non‑metals and other halogen elements. It generates characteristic blue complex when interacting with starch.
Application
‑ Raw material for production of various iodide compounds
‑ Applied in manufacturing of pesticides, feed additives, dyes, test papers and chemical reagents
‑ Used for electronic industry and high‑purity reagent preparation
‑ Applied in volumetric titration, colorimetric analysis and chemical catalysis
‑ Used as raw material for pharmaceutical intermediate synthesis
Production Method
Ion‑exchange process: Soak kelp raw material, remove impurities by alkali treatment, adjust pH value, perform oxidation by chlorine gas, adsorb with ion‑exchange resin, desorption and precipitation, then melt‑refine with concentrated sulfuric acid to obtain finished iodine.
Air‑blowing process: Acidify bittern feedstock, oxidize by chlorine, blow out iodine with heated air, reduce by sulfur dioxide solution, re‑oxidize and precipitate, followed by melt‑refining for purification.
Recrystallization: Industrial‑grade iodine is purified via recrystallization to get high‑purity iodine product.
Safety Information
Storage & Transportation
Store in cool, dry and well‑ventilated warehouse. Keep separated from oxidizing agents.
Fire‑fighting agents: water, sand.