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Name	SULFUR TRIOXIDE	EINECS	231-197-3
CAS No.	7446-11-9	Density	2.27 g/cm³
PSA	83.30000	LogP	0.29180
Solubility	reacts violently with water	Melting Point	16.8 °C(lit.)
Formula	SO₃	Boiling Point	44.8 °C at 760 mmHg
Molecular Weight	80.0642	Flash Point	N/A
Transport Information	UN 1829 8/PG 1	Appearance	Needles or polymer
Safety	53-17-26-36/37/39-45-8-25	Risk Codes	45-8-14-26-34
Molecular Structure		Hazard Symbols	O,T+,C
Synonyms	Sulfuroxide (SO3);Sulfuric anhydride;	Article Data	918

SULFUR TRIOXIDE Synthetic route

: calcium sulfate

: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
With chlorine In neat (no solvent) at 1100 - 1150°C;;	100%
With chlorine In neat (no solvent) addn. of SiO2, NaCl or Na2SO4 increase reaction temp.; react. accelerated;;
With chlorine In neat (no solvent) in presence of charcoal strong react.; addn. of NiSO4, CuSO4, MgSO4, Fe2O3 or KCl reduced yield; no influence of overheated water vapor;; react. detected at 700 - 1150°C;;

: 7446-09-5
sulfur dioxide

: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
manganese(IV) oxide 450°C;	98%
2Na2O3MoO3V2O5 440°C;	98.4%
two-stage catalyst contact cooled by SO2 gas, external heat exchangers, temp. in contact bed:400-411°C;	98%

: 7446-09-5
sulfur dioxide

: 80937-33-3
oxygen

: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
vanadia Kinetics; 437°C;	98%
platinum Kinetics; 415°C;	98%
vanadia Kinetics; 452°C;	97%

: pyrite

: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
3-stage contact bed;	98%
no C content in pyrite;	96%
no C content in pyrite;	96%

: pyrite

: 80937-33-3
oxygen

: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
With catalyst: Fe compd. High Pressure; higher yield with increasing pressure, 600-630°C at 100 at;	97%
With catalyst: Fe compd. High Pressure; higher yield with increasing pressure, 600-630°C at 100 at;	97%
Kinetics; 420°C;

: 80937-33-3
oxygen

: 7704-34-9
sulfur

: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
With hydrogenchloride; copper dichloride In neat (no solvent) Kinetics; (450°C, 1.5 s);	95%
With hydrogenchloride SO3 stabilized as Lewis-addukt(HCl.SO3); O2: 30l/h, HCl: 8l/h; 60min;	40%
Kinetics; 420°C;

: silver sulfide

A: 7446-09-5
sulfur dioxide

B: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
With oxygen In neat (no solvent) heating in a stream of O2 at 550 - 600°C (formation of SO2 from 82 % of S and of Ag2SO4), later at 980 - 1070°C (decomposition of Ag2SO4);;	A 95% B 5%
With O2 In neat (no solvent) heating in a stream of O2 at 550 - 600°C (formation of SO2 from 82 % of S and of Ag2SO4), later at 980 - 1070°C (decomposition of Ag2SO4);;	A 95% B 5%

: 25362-97-4
SbCl5*SO3

A: 7791-27-7
pyrosulfuryl chloride

B: 2SbCl4(1+)*SO4(2-)=(SbCl4)2SO4

C: 7647-18-9
antimonypentachloride

D: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
70°C in vac.;	A n/a B n/a C n/a D 95%

: Hg(2+)*2(O3SC6Cl5)(1-)*2H2O=Hg(O3SC6Cl5)2*2H2O

A: 608-93-5
pentachlorobenzene

B: 7446-11-9
sulfur trioxide

C: 1043-49-8
Bis-pentachlor-phenyl-quecksilber

Conditions

Conditions	Yield
130-220°C;	A <1 B 80% C 64%

: Hg(O3S-p-HC6Cl4)2

A: 38180-52-8
(p-HC6Cl4)2Hg

B: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
130-220°C;	A 78% B 80%

SULFUR TRIOXIDE Chemical Properties

IUPAC name:Sulfur trioxide
Other names:Sulfuric anhydride;Sulfan
EINECS: 231-197-3
Merck:13,9069
Melting point :16.9 °C
Boiling point :45 °C
vapor density :2.8 (vs air)
vapor pressure:280 mm Hg ( 25 °C)
storage temp.: Indoors
Sulfur trioxide(7446-11-9) is the chemical compound with the formula SO₃. Its molar mass is 80.06 g/mol. Its liquid density is 1.92 g/cm³.
The Structure of Sulfur trioxide(7446-11-9):

SULFUR TRIOXIDE Uses

Liquid sulfur trioxide((7446-11-9)) is used for sulfonation, especially in the manufacture of detergents. In the past, the difficulty was the instability of the sulfur trioxide. However, under the trade name Sulfans, stabilized forms of sulfur trioxide are available; several patented inhibitors such as boron compounds, methane sulfonyl chloride, sulfur, tellurium, and phosphorus oxychloride inhibit crystallization or conversion to a polymer.

SULFUR TRIOXIDE Production

Sulfur trioxide(7446-11-9) is a pungent gas that is produced by the oxidation of sulfur dioxide or the complete combustion of sulfur with oxygen. It is also manufactured by distillation of strong oleum (H₂SO₄.SO₃).

SULFUR TRIOXIDE Toxicity Data With Reference

1.		ihl-hmn TCLo:30 mg/m3:NOSE,PUL		JPBAA7 Journal of Pathology and Bacteriology. 68 (1954),197.
2.		ihl-gpg LCLo:30 mg/m3/6H		JPBAA7 Journal of Pathology and Bacteriology. 68 (1954),197.

SULFUR TRIOXIDE Consensus Reports

EPA Extremely Hazardous Substances List.SULFUR TRIOXIDE is reported in EPA TSCA Inventory.

SULFUR TRIOXIDE Safety Profile

Poison by inhalation. Human systemic effects by inhalation: cough and other pulmonary and olfactory changes. A corrosive irritant to skin, eyes, and mucous membranes. Violent reaction with O₂F₂, PbO, NClO₂, HClO₄, P, tetrafluorethylene, acetonitrile, sulfuric acid, dimethyl sulfoxide, dioxan, water, diphenylmercury, formamide, iodine, pyridine, metal oxides. Reacts with steam to form corrosive, toxic fumes of sulfuric acid. When heated to decomposition it emits toxic fumes of SO_x. See also SULFURIC ACID.

SULFUR TRIOXIDE Standards and Recommendations

DOT Classification: 8; Label: Corrosive, Poison

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