Sulfur dioxide CAS NO.7446-09-5

Sulfur dioxide Chemical Properties

mp	−73 °C(lit.)
bp	−10 °C(lit.)
density	1.25 g/mL at 25 °C(lit.)
vapor density	2.26 (21 °C, vs air)
vapor pressure	1779 mm Hg ( 21 °C)
Merck	13,9061
Stability:	Stable. Non-corrosive when dry to common materials except zinc; corrosive when wet. Incompatible with strong reducing or oxidizing agents, moisture, zinc and its alloys.
CAS DataBase Reference	7446-09-5(CAS DataBase Reference)
NIST Chemistry Reference	Sulfur dioxide(7446-09-5)
EPA Substance Registry System	Sulfur dioxide(7446-09-5)

Safety Information

Hazard Codes	T
Risk Statements	23-34
Safety Statements	9-26-36/37/39-45
RIDADR	UN 2037 2.3
WGK Germany	1
RTECS	WS4550000
F	4.5-31
HazardClass	2.3
Hazardous Substances Data	7446-09-5(Hazardous Substances Data)

MSDS Information

Provider	Language
Sulfur dioxide	English
SigmaAldrich	English

Sulfur dioxide Usage And Synthesis

Chemical Properties	colourless gas
Air & Water Reactions	Dissolves in water to form sulfurous acid, a corrosive liquid. Moist Sulfur dioxide is very corrosive due to the slow formation of sulfuric acid [Handling Chemicals Safely 1980 p. 876].
Reactivity Profile	Sulfur dioxide is acidic. Reacts exothermically with bases such as amines, amides, metal oxides, and hydroxides. Frequently used as a reducing agent although Sulfur dioxide is not a powerful one. Acts as a reducing bleach to decolorize many materials. Can act as an oxidizing agent. Supports combustion of powdered aluminum [Mellor 5:209-212 1946-47]. Reacts explosively with fluorine [Mellor 2:1 1946-47]. Supports burning of manganese [Mellor 12:187 1946-47]. Readily liquefied by compression. Contact between the liquid and water may result in vigorous or violent boiling and extremely rapid vaporization. If the water is hot an explosion may occur. Pressures may build to dangerous levels if the liquid contacts water in a closed container [Handling Chemicals Safely 1980]. Supports incandescent combustion of monocesium acetylide, monopotassium acetylide, cesium oxide, iron(II) oxide, tin oxide, and lead oxide [Mellor]. Ethylene oxide and SO2 can react violently in pyridine solution with pressurization if ethylene oxide is in excess (Nolan, 1983, Case History 51).
Health Hazard	Sulfur dioxide may cause death or permanent injury after very short exposure to small quantities. 1,000 ppm causes death in from 10 minutes to several hours by respiratory depression. It is an eye and respiratory tract irritant. Persons with asthma, subnormal pulmonary functions or cardiovascular disease are at a greater risk.
Fire Hazard	Containers may explode in heat of fire or they may rupture and release irritating toxic Sulfur dioxide. Sulfur dioxide has explosive properties when Sulfur dioxide comes in contact with sodium hydride; potassium chlorate at elevated temperatures; ethanol; ether; zinc ethylsulfurinate at very cool temperatures (-15C); fluorine; chlorine trifluoride and chlorates. Sulfur dioxide will react with water or steam to produce toxic and corrosive fumes. When the liquid is heated Sulfur dioxide may release irritating, toxic Sulfur dioxide gas. Avoid ammonia, monocesium or monopotassium acetylide; dicesium monoxide; iron (II) oxide; tin oxide; lead (IV) oxide; chromium; manganese; molten sodium, powder aluminum and rubidium. Sulfur dioxide has explosive properties when Sulfur dioxide comes in contact with sodium hydride; potassium chlorate at elevated temperatures; ethanol; ether; zinc ethylsulfurinate at very cool temperatures (-15C); fluorine; chlorine trifluoride and chlorates. Sulfur dioxide will react with water or steam to produce toxic and corrosive fumes. Hazardous polymerization may not occur.

Sulfur dioxide Preparation Products And Raw materials

Preparation Products

Chlorsulfuron-->Chromium oxide-->(R)-(+)-2-Methyl-2-propanesulfinamide-->Thiophosgene-->Platinum-->Sulfolane-->Methyl 2-(chlorosulfonyl)benzoate-->2-Aminonaphthalene-1-sulfonic acid-->Selenium-->Chlorine dioxide -->Saccharin sodium -->CARBONYL SULFIDE-->Isobutyryl chloride-->Sodium chlorite-->AMMONIUM SULFITE-->Ammonium bisulfite-->o-Chlorobenzenesulfonamide-->Thifensulfuron methyl-->Phenylacetyl chloride-->7-Anilino-4-hydroxy-2-naphthalenesulfonic acid-->6-Amino-4-hydroxy-2-naphthalenesulfonic acid-->Benzidamine hydrochloride -->PENTACHLOROPHENOL DODECANOATE-->RONGALITE-->2,2'-(1,3,4-oxadiazole-2,5-diyl)bis[1-aminoanthraquinone] -->Ammonium carbonate additive-->2-Acetoxy-2-phenylacetyl chloride-->CYANOACRYLIC ACID METHYL ESTER-->SULFURYL FLUORIDE-->polymer bactericidal flocculent-->Etamsylate-->DI-N-BUTYL SULFATE-->3-SULFOLENE-->MALT EXTRACT-->Phenylarsine oxide-->5-(2-Carboxybenzoyl)-2-chlorobenzenesulfonyl chloride-->2-IODOBENZOYL CHLORIDE-->1-Bromo-2-naphthol-->DESYL CHLORIDE

Raw materials

Sulfuric acid -->Sodium carbonate-->Ammonium hydroxide-->Ammonia-->Sulfur-->Oxygen-->Citric acid-->Sulphur-->Coke (coal) -->PYRITE-->Ammonium bisulfite-->AMMONIUM SULFITE

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