SULFUR TRIOXIDE supplier | CasNO.7446-11-9

Name
Sulfur trioxide
EINECS 231-197-3
CAS No. 7446-11-9
Article Data918
CAS DataBase
Density 2.27 g/cm³
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
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;
PSA 83.30000
LogP 0.29180

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%

...Expand

: 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%

...Expand

: 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%

: iron(II) sulfate

A: iron(III) oxide

B: 7446-09-5
sulfur dioxide

C: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
With pyrographite 700°C;	A n/a B 80% C n/a
With C 700°C;	A n/a B 80% C n/a
700°C;	A n/a B 50% C n/a

...Expand

: 126885-21-0
disulfur dioxide

A: 7446-09-5
sulfur dioxide

B: 7446-11-9
sulfur trioxide

C: 7704-34-9
sulfur

Conditions

Conditions	Yield
With oxygen In neat (no solvent) oxidn. of S2O2 with an excess of O2, min. ignition pressure at 32°C 54 Torr, at 150°C 2 Torr, mechanism discussed, sometimes react. with lightening, inhibition by SO2;;	A 10-25 B 15-30 C 80%

...Expand

: Hg(2+)*2OSO2C6F5(1-)*2H2O=Hg(OSO2C6F5)2*2H2O

A: 363-72-4
Pentafluorobenzene

B: 313-50-8
pentafluorobenzenesulfonic acid

C: 7446-11-9
sulfur trioxide

D: 973-17-1
bis(pentafluorophenyl)mercury(II)

Conditions

Conditions	Yield
130-220°C;	A 12% B 9% C 70% D 53%
130-240°C;
130-240°C;

...Expand

: Hg(O3S-p-HC6F4)2*2H2O

A: 2262-05-7
(p-HC6F4)2Hg

B: 327-54-8
1,2,4,5-Tetrafluorobenzene

C: 40707-55-9
2,3,5,6-tetrafluorobenzenesulfonic acid

D: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
130-230°C;	A 17% B 17% C 17% D 60%

...Expand

: Hg(O3S-m-HC6Cl4)2*2H2O

A: 37963-59-0
(m-HC6Cl4)2Hg

B: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
130-220°C;	A 44% B 60%

: 12395-41-4
bis(pentafluorosulfur) peroxide

: 7446-09-5
sulfur dioxide

A: 173009-97-7, 118492-84-5, 13709-54-1
thionyl tetrafluoride

B: 81439-35-2
pentafluorosulfur fluorosulfonate

C: 7446-11-9
sulfur trioxide

D: 7783-42-8
thionyl fluoride

E: 2551-62-4
sulfur(VI) hexafluoride

Conditions

Conditions	Yield
byproducts: SiF4, sulfur; other Radiation; photochemical reaction with 253.7 nm radiation, 48 h;	A n/a B 45% C n/a D n/a E n/a

...Expand

: 80937-33-3
oxygen

: 7704-34-9
sulfur

A: 7446-09-5
sulfur dioxide

B: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
In gas mixt. of N2 and sulfur vapor; O2: 100l/h; 15min, tube system, products cooled;	A n/a B 41%
1000-1370°C, rapid cooling to minimize SO3 formation;
very low SO3 content;

...Expand

: Hg(O3S-o-HC6Cl4)2*2H2O

A: 634-66-2
1,2,3,4,-tetrachlorobenzene

B: 40707-33-3
o-HC6Cl4SO3H

C: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
130-250°C;	A 15% B 10% C 40%

...Expand

: 7487-88-9
magnesium sulfate

A: 7446-11-9
sulfur trioxide

B: magnesium oxide

Conditions

Conditions	Yield
995 °C in N2; part of a Mg-S-I water splitting cycle;	A 30% B 30%
In neat (no solvent) heating at 950-1050 K (effusion orifices with A/a ratios of 10-30);
1120-1200°C; 29,1mol% in 15min; 90mol% in 2h;
900°C, in air stream;

: iron(II) sulfate

: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
In neat (no solvent) evolution of SO3 by heating FeSO4 in a glass tube by little admission of air; beginning at 590 °C, only 3% after heating 2h at 625 to 635 °C;;	3%

: 75-15-0
carbon disulfide

oxygen: oxygen

A: 7446-11-9
sulfur trioxide

B: 15719-64-9, 15719-76-3, 97762-63-5
methylammonium carbonate

C sulfur dioxide: sulfur dioxide

D sulfur: sulfur

Conditions

Conditions	Yield
Bei der Explosion mit ueberschuessigem Sauerstoff;

...Expand

: 63549-29-1
disulfuric acid carbonylamide chloride

A: 1189-71-5
isocyanate de chlorosulfonyle

B: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
at 160℃;

: 54060-35-4
2,3-disulfosuccinic acid

A: 7446-11-9
sulfur trioxide

B: 7732-18-5
water

C: 15719-64-9, 15719-76-3, 97762-63-5
methylammonium carbonate

...Expand

: 7647-01-0
hydrogenchloride

: N,N'-bis-sulfomethyl-hydrazine-N-sulfonic acid

A: 50-00-0
formaldehyd

B: 7664-93-9
sulfuric acid

C: 7446-11-9
sulfur trioxide

D: 302-01-2
hydrazine

...Expand

: 56639-44-2
[1,3,2]dioxathietane-2,2-dioxide

A: 7446-11-9
sulfur trioxide

B CO: CO

C SO2: SO2

Conditions

Conditions	Yield
at 155℃; beim Schmelzen;

...Expand

: 7791-27-7
pyrosulfuryl chloride

: 10034-85-2
hydrogen iodide

A: 7647-01-0
hydrogenchloride

B: 7446-09-5
sulfur dioxide

C: 7446-11-9
sulfur trioxide

D: 7553-56-2
iodine

Conditions

Conditions	Yield
In neat (no solvent) violent reaction of dry HI even at temp. of a cold mixture of ice and sodium chloride;;

...Expand

: 13036-75-4
fluorosulfonyl anhydride

A: 640723-20-2, 2699-79-8, 12769-73-2
fluorosulfonyl fluoride

B: 7446-11-9
sulfur trioxide

Conditions

Conditions	Yield
500°C;
500°C;

: 10545-99-0
sulfur dichloride

: 7446-11-9
sulfur trioxide

A: 7719-09-7
thionyl chloride

B: 7446-09-5
sulfur dioxide

Conditions

Conditions	Yield
In neat (no solvent) below -10°C or under pressure;;	A 100% B n/a

...Expand

: lithium sulfate

: 7446-11-9
sulfur trioxide

: lithium pyrosulfate

Conditions

Conditions	Yield
SO3 in excess, 10-15 min, closed vessel 300°C;	100%
In neat (no solvent) formation on heating Li2SO4 in a SO3-atmosphere to .300°C;;
In neat (no solvent) formation on heating Li2SO4 in a SO3-atmosphere to .300°C;;
In neat (no solvent) reaction of SO3-vapour with Li2SO4 at 450°C; TGA;

: 7446-11-9
sulfur trioxide

: 7757-82-6
sodium sulfate

: sodium pyrosulfate

Conditions

Conditions	Yield
SO3 in excess, 10-15 min, closed vessel 450°C;	100%
react. of Na2SO4 with SO3 at ambient temp.;; substance with Na2S2O7 and unchanged Na2SO4 obtained;;
In neat (no solvent) react. of Na2SO4 with an excess of SO3 above 150°C;;

: π-C5H5Zr(OSO3H)3*(CH3CO)2O

: 7446-11-9
sulfur trioxide

: π-HO3SC5H4Zr(OSO3H)3

Conditions

Conditions	Yield
In 1,2-dichloro-ethane dry CH2ClCH2Cl/3 h/5°C;;	100%
In 1,2-dichloro-ethane dry CH2ClCH2Cl/3 h/5°C;;	100%

: ammonium sulfate

: 7664-93-9
sulfuric acid

: 7446-11-9
sulfur trioxide

: 11113-50-1
boric acid

: 3H3N*3H(1+)*B(SO4)3(3-)

Conditions

Conditions	Yield
at 300℃; for 3h;	100%

...Expand

: 1633-05-2
strontium(II) carbonate

: 7664-93-9
sulfuric acid

: 7446-11-9
sulfur trioxide

: 11113-50-1
boric acid

: Sr(2+)*2{B(SO4)2}(1-)=Sr{B(SO4)2}2

Conditions

Conditions	Yield
at 180℃; for 24h;	100%

...Expand

: 7446-11-9
sulfur trioxide

A: 7446-09-5
sulfur dioxide

B: 80937-33-3
oxygen

Conditions

Conditions	Yield
995 °C in N2; part of a Mg-S-I water splitting cycle;	A 99% B 99%
copper(II) oxide In gas equil. react.;
platinum In gas equil. react.;

: ammonium hexachloroplumbate

: 7664-93-9
sulfuric acid

: 7446-11-9
sulfur trioxide

: Pb(2+)*S3O10(2-)=PbS3O10

Conditions

Conditions	Yield
In sulfuric acid aq. H2SO4; (NH42PbCl6 and oleum filled in glass tube; torch-sealed under vac.; heated up to 250°C; maintained for 24 h, slowly cooled (1.8 K/h); ppt. collected by decantation of mother liqour under inert condns.;	99%

...Expand

: 7446-11-9
sulfur trioxide

: 21259-75-6
mercury bis(trifluoromethanethiolate)

: Quecksilber(II)-bis

Conditions

Conditions	Yield
In liquid sulphur dioxide Ar; 20°C;; condensation of SO2; residue washed with FCCl3; elem. anal.;;	96%

: 7446-11-9
sulfur trioxide

: 873376-62-6
triethoxyantimony

: 80398-49-8
ethoxyantimony bis(ethyl sulfate)

Conditions

Conditions	Yield
In dichloromethane SO3 soln. was added to Sb compd. at -50°C (N2 or Ar); evapn., drying in vac.; elem. anal.;	96%

: 116-15-4
perfluoropropylene

: 7446-11-9
sulfur trioxide

: 773-15-9
1,2,2-trifluoro-2-hydroxy-1-trifluoromethylethanesulfonic acid sultone

Conditions

Conditions	Yield
150°C, 5 h;	94%
150°C, 5 h;	94%
60°C;	92%

: 127-63-9
diphenyl sulphone

: 7446-11-9
sulfur trioxide

: 98-11-3
benzenesulfonic acid

Conditions

Conditions	Yield
With sulfuric acid In water; benzene	93%
With phosphoric acid; sulfuric acid In water; benzene	87%

: 116-14-3
polytetrafluoroethylene

: 7446-11-9
sulfur trioxide

: 697-18-7
tetrafluoroethane-β-sultone

Conditions

Conditions	Yield
fresh distilled SO3, 2.7 atm, below 80°C, 1 h;	93%
fresh distilled SO3, 2.7 atm, below 80°C, 1 h;	93%
fresh distilled SO3, 2.7 atm, below 80°C, 1 h;	93%

: 7446-11-9
sulfur trioxide

: 873376-62-6
triethoxyantimony

: antimony tris(ethyl sulfate)

Conditions

Conditions	Yield
In dichloromethane SO3 soln. was added to Sb compd. at -50°C (N2 or Ar); elem. anal.;	93%

: 180070-46-6, 180070-53-5
((CH3)3Sn)C(C6H9)CH(Sn(CH3)3)

: 7446-11-9
sulfur trioxide

: 180071-29-8
(CH3)3SnSO3C(C6H9)CHSO3Sn(CH3)3

Conditions

Conditions	Yield
In dichloromethane absence of air and moisture; 2 equiv. SO2, stirring at -78°C for 4 h; evapn., distn.; elem. anal.;	93%

: 7446-11-9
sulfur trioxide

: silver fluoride

A: 33983-99-2
silver(I) fluorosulfate

B: silver sulfate

Conditions

Conditions	Yield
	A 91% B n/a

...Expand

: 685-63-2
hexafluoro-1,3-butadiene

: 7446-11-9
sulfur trioxide

: 106-99-0
buta-1,3-diene

: 69740-49-4
4-trifluorovinyltrifluoro-1,2-oxathietane 2,2-dioxide

Conditions

Conditions	Yield
In liquid sulphur dioxide dropping SO3 into a soln. of CF2=CFCF=CF2 in SO2 at -10°C followed by stripping SO2 and butadiene; distn.;	91%
In sulfur dioxide dropping SO3 into a soln. of CF2=CFCF=CF2 in SO2 at -10°C followed by stripping SO2 and butadiene; distn.;	91%

...Expand

: (5,7,12,14-tetramethyldibenzo[b,i][1,4,8,11]tetraazacyclotetradecinate(2-))V=O

: 7446-11-9
sulfur trioxide

: 174715-71-0
(5,7,12,14-tetramethyldibenzo[b,i][1,4,8,11]tetraazacyclotetradecinate(2-))V(O2SO2)

Conditions

Conditions	Yield
In dichloromethane Ar-atmosphere; slow addn. of SO3 to V-complex at 0°C, stirring atroom temp. for 2 h; ether addn., collection (filtration), washing (CH2Cl2, ether); elem. anal.;	91%

: 7664-93-9
sulfuric acid

: 14154-42-8, 62905-77-5
phthalocyaninealuminum chloride

: 7446-11-9
sulfur trioxide

: (disulfophthalocyanine)aluminum chloride

Conditions

Conditions	Yield
In sulfuric acid mixt. Al complex and oleum was stirred at room temp. for 16 h.; react. mixt. was cooled to ambient temp., poured onto ice, ppt. was filtered off, washed with 1% aq. HCl, water, dried in vac. at 90°C;	91%

...Expand

: 79-38-9
Chlorotrifluoroethylene

: 7446-11-9
sulfur trioxide

: 1004-47-3
3-chlorotrifluoro-1,2-oxathietane 2,2-dioxide

Conditions

Conditions	Yield
at 70°C;	90%

: 7446-11-9
sulfur trioxide

: 7790-89-8
chlorine monofluoride

A: 640723-20-2, 2699-79-8, 12769-73-2
fluorosulfonyl fluoride

B: ClSO3F

Conditions

Conditions	Yield
byproducts: Cl2; from -196 °C to room temp., excess ClF;	A n/a B 90%

...Expand

: 7446-11-9
sulfur trioxide

: 7664-41-7
ammonia

: ammonium sulfamate

Conditions

Conditions	Yield
220-280 °C, 30 atm NH3, 30 min;	90%

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

Product Name

Sulfur trioxide

Synthetic route

SULFUR TRIOXIDE Chemical Properties

SULFUR TRIOXIDE Uses

SULFUR TRIOXIDE Production

SULFUR TRIOXIDE Toxicity Data With Reference

SULFUR TRIOXIDE Consensus Reports

SULFUR TRIOXIDE Safety Profile

SULFUR TRIOXIDE Standards and Recommendations

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