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Basic Information
| CAS No.: | 7446-11-9 |
|---|---|
| Name: | Sulfur trioxide |
| Article Data: | 918 |
| Molecular Structure: | |
|
|
|
| Formula: | SO3 |
| Molecular Weight: | 80.0642 |
| Synonyms: | Sulfuroxide (SO3);Sulfuric anhydride; |
| EINECS: | 231-197-3 |
| Density: | 2.27 g/cm3 |
| Melting Point: | 16.8 °C(lit.) |
| Boiling Point: | 44.8 °C at 760 mmHg |
| Solubility: | reacts violently with water |
| Appearance: | Needles or polymer |
| Hazard Symbols: |
 O, T+, C
|
| Risk Codes: | 45-8-14-26-34 |
| Safety: | 53-17-26-36/37/39-45-8-25 |
| Transport Information: | UN 1829 8/PG 1 |
| PSA: | 83.30000 |
| LogP: | 0.29180 |
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Synthetic route
- 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;; |
Conditions
| Conditions | Yield |
|---|---|
| manganese(IV) oxide 450°C; | 98% |
| 2Na2O*3MoO3*V2O5 440°C; | 98.4% |
| two-stage catalyst contact cooled by SO2 gas, external heat exchangers, temp. in contact bed:400-411°C; | 98% |
Conditions
| Conditions | Yield |
|---|---|
| vanadia Kinetics; 437°C; | 98% |
| platinum Kinetics; 415°C; | 98% |
| vanadia Kinetics; 452°C; | 97% |
- 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% |
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; |
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; |
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
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
Conditions
| Conditions | Yield |
|---|---|
| 130-220°C; | A <1 B 80% C 64% |
...Expand
Conditions
| Conditions | Yield |
|---|---|
| 130-220°C; | A 78% B 80% |
Raw Materials
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Sulfur trioxide
Chemistry
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):
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.
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).
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. |
Consensus Reports
EPA Extremely Hazardous Substances List.SULFUR TRIOXIDE is reported in EPA TSCA Inventory.
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 SOx. See also SULFURIC ACID.
Standards and Recommendations
DOT Classification: 8; Label: Corrosive, Poison