三氧化硫（CAS 7446-11-9）：分子式 O3S、分子量 80.07。
| CAS号 | 7446-11-9 |
|---|---|
| 分子式 | O3S |
| 分子量 | 80.07 |
| 熔点 | 62.2 °C |
| 沸点 | 44.8 °C |
| LogP | -0.5 |
| 应用领域 | Uses: Used as a sulfonating agent in the production of detergents and an intermediate in the production of sulfuric acid and explosives、[HSDB]、Intermediate in sulfuric acid manufacture、in sulfonations for formation of addition cmpd with amines、in the manufacture of explosives、Sulfonation of organic compounds、especially nonionic detergents、solar energy collectors.、Production of detergents、as a raw material for chlorosulfuric acid and 65% oleum. Has been added to cooled combustion gases at many coal burning power plants to improve dust removal in electrostatic precipitators.、Sulfur trioxide is used as such for preparing sulfonated oils、and alkyl arenesulfonate detergents.、... Used as a powerful、but generally indiscriminate oxidizing agent、however、it will selectively oxidize pentachlorotoluene and similar compounds to the alcohol.、Methods of Manufacturing: Prepared by the contact process、for example、by the action of oxygen on sulfur dioxide in the presence of catalysts such as platinized asbestos、platinized magnesium sulfate、ferric oxide or vanadium compounds.、Liquid sulfur trioxide is produced by heating oleum in a boiler to generate SO3 gas which is then condensed.、May be prepared in the laboratory by heating fuming sulfuric acid and collecting the sublimate in a cooled receiver. If the vapor is condensed above 27 °C、the gamma form is obtained as a liquid. If the vapor is condensed below 27 °C and in the presence of a trace of moisture、a mixture of all 3 forms is obtained. The 3 forms can be separated by fractional distillation.、Sulfur trioxide is ... produced in dilute gaseous form in a contact-process sulfuric acid plant through the oxidation of sulfur dioxide-containing gases. So far、the only reported preparation of pure sulfur trioxide from dilute SO3-containing gases has been a pilot-plant scale process involving cryoscopic condensation. The usual procedure instead involves distillation of oleum. The heat required for oleum distillation is most conveniently supplied by hot contact gas from the associated sulfuric acid plant.、Impurities: Trace amounts of water or sulfuric acid can catalyze the formation of polymers.、Formulations、Preparations: Under the trademark Sulfan、a product is marketed which contains 0.5% of a stabilizer to prevent polymerization to higher melting forms: Sulfan A consists largely of beta sulfur trioxide ... Sulfan B consists largely of gamma sulfur trioxide ... Sulfan C contains no stabilizer and will polymerize to alpha sulfur trioxide.、Stabilizers added include: 0.3% dimethyl sulfate with 0.005% boric oxide、Stabilized、technical、liquid grades、Consumption Patterns: Its principal applications are in production of detergents and as a raw material for chlorosulfuric acid and 65% oleum. (1983)、U.S. Production: Production volume for non-confidential chemicals reported under the 2006 Inventory Update Rule. Chemical: Sulfur trioxide. Aggreated National Production Volume: 500 million to < 1 billion lbs.、General Manufacturing Information: Sulfur trioxide: ACTIVE、Usually generated in the plant where it is to be used |
登记用途：Uses: Used as a sulfonating agent in the production of detergents and an intermediate in the production of sulfuric acid and explosives、[HSDB]、Intermediate in sulfuric acid manufacture、in sulfonations for formation of addition cmpd with amines、in the manufacture of explosives、Sulfonation of organic compounds、especially nonionic detergents、solar energy collectors.、Production of detergents、as a raw material for chlorosulfuric acid and 65% oleum. Has been added to cooled combustion gases at many coal burning power plants to improve dust removal in electrostatic precipitators.、Sulfur trioxide is used as such for preparing sulfonated oils、and alkyl arenesulfonate detergents.、... Used as a powerful、but generally indiscriminate oxidizing agent、however、it will selectively oxidize pentachlorotoluene and similar compounds to the alcohol.、Methods of Manufacturing: Prepared by the contact process、for example、by the action of oxygen on sulfur dioxide in the presence of catalysts such as platinized asbestos、platinized magnesium sulfate、ferric oxide or vanadium compounds.、Liquid sulfur trioxide is produced by heating oleum in a boiler to generate SO3 gas which is then condensed.、May be prepared in the laboratory by heating fuming sulfuric acid and collecting the sublimate in a cooled receiver. If the vapor is condensed above 27 °C、the gamma form is obtained as a liquid. If the vapor is condensed below 27 °C and in the presence of a trace of moisture、a mixture of all 3 forms is obtained. The 3 forms can be separated by fractional distillation.、Sulfur trioxide is ... produced in dilute gaseous form in a contact-process sulfuric acid plant through the oxidation of sulfur dioxide-containing gases. So far、the only reported preparation of pure sulfur trioxide from dilute SO3-containing gases has been a pilot-plant scale process involving cryoscopic condensation. The usual procedure instead involves distillation of oleum. The heat required for oleum distillation is most conveniently supplied by hot contact gas from the associated sulfuric acid plant.、Impurities: Trace amounts of water or sulfuric acid can catalyze the formation of polymers.、Formulations、Preparations: Under the trademark Sulfan、a product is marketed which contains 0.5% of a stabilizer to prevent polymerization to higher melting forms: Sulfan A consists largely of beta sulfur trioxide ... Sulfan B consists largely of gamma sulfur trioxide ... Sulfan C contains no stabilizer and will polymerize to alpha sulfur trioxide.、Stabilizers added include: 0.3% dimethyl sulfate with 0.005% boric oxide、Stabilized、technical、liquid grades、Consumption Patterns: Its principal applications are in production of detergents and as a raw material for chlorosulfuric acid and 65% oleum. (1983)、U.S. Production: Production volume for non-confidential chemicals reported under the 2006 Inventory Update Rule. Chemical: Sulfur trioxide. Aggreated National Production Volume: 500 million to < 1 billion lbs.、General Manufacturing Information: Sulfur trioxide: ACTIVE、Usually generated in the plant where it is to be used。
三氧化硫 是一种化工化合物，登记 CAS 号为 7446-11-9，分子式 O3S（分子量 80.07）。
登记 CAS 号：7446-11-9
其分子式 O3S 由 3 个氧、1 个硫 组成。
别名/同义词：三氧化硫 · Sulfur trioxide
三氧化硫 的 CAS 登记号为 7446-11-9。
分子式 O3S，分子量 80.07。
别名/同义词：三氧化硫、Sulfur trioxide。
登记用途：Uses: Used as a sulfonating agent in the production of detergents and an intermediate in the production of sulfuric acid and explosives、[HSDB]、Intermediate in sulfuric acid manufacture、in sulfonations for formation of addition cmpd with amines、in the manufacture of explosives、Sulfonation of organic compounds、especially nonionic detergents、solar energy collectors.、Production of detergents、as a raw material for chlorosulfuric acid and 65% oleum. Has been added to cooled combustion gases at many coal burning power plants to improve dust removal in electrostatic precipitators.、Sulfur trioxide is used as such for preparing sulfonated oils、and alkyl arenesulfonate detergents.、... Used as a powerful、but generally indiscriminate oxidizing agent、however、it will selectively oxidize pentachlorotoluene and similar compounds to the alcohol.、Methods of Manufacturing: Prepared by the contact process、for example、by the action of oxygen on sulfur dioxide in the presence of catalysts such as platinized asbestos、platinized magnesium sulfate、ferric oxide or vanadium compounds.、Liquid sulfur trioxide is produced by heating oleum in a boiler to generate SO3 gas which is then condensed.、May be prepared in the laboratory by heating fuming sulfuric acid and collecting the sublimate in a cooled receiver. If the vapor is condensed above 27 °C、the gamma form is obtained as a liquid. If the vapor is condensed below 27 °C and in the presence of a trace of moisture、a mixture of all 3 forms is obtained. The 3 forms can be separated by fractional distillation.、Sulfur trioxide is ... produced in dilute gaseous form in a contact-process sulfuric acid plant through the oxidation of sulfur dioxide-containing gases. So far、the only reported preparation of pure sulfur trioxide from dilute SO3-containing gases has been a pilot-plant scale process involving cryoscopic condensation. The usual procedure instead involves distillation of oleum. The heat required for oleum distillation is most conveniently supplied by hot contact gas from the associated sulfuric acid plant.、Impurities: Trace amounts of water or sulfuric acid can catalyze the formation of polymers.、Formulations、Preparations: Under the trademark Sulfan、a product is marketed which contains 0.5% of a stabilizer to prevent polymerization to higher melting forms: Sulfan A consists largely of beta sulfur trioxide ... Sulfan B consists largely of gamma sulfur trioxide ... Sulfan C contains no stabilizer and will polymerize to alpha sulfur trioxide.、Stabilizers added include: 0.3% dimethyl sulfate with 0.005% boric oxide、Stabilized、technical、liquid grades、Consumption Patterns: Its principal applications are in production of detergents and as a raw material for chlorosulfuric acid and 65% oleum. (1983)、U.S. Production: Production volume for non-confidential chemicals reported under the 2006 Inventory Update Rule. Chemical: Sulfur trioxide. Aggreated National Production Volume: 500 million to < 1 billion lbs.、General Manufacturing Information: Sulfur trioxide: ACTIVE、Usually generated in the plant where it is to be used。
三氧化硫（CAS 7446-11-9）的独立参考数据，整理自公开化学数据库。
| CAS Registry Number | 7446-11-9 |
|---|---|
| PubChem CID | 24682 |
| Molecular formula | O3S |
| IUPAC name | sulfur trioxide |
| UNII (FDA) | HH2O7V4LYD |
| Molecular Weight | 80.07 |
|---|---|
| XLogP3 | -0.5 |
| Hydrogen Bond Donor Count | 0 |
| Hydrogen Bond Acceptor Count | 3 |
| Rotatable Bond Count | 0 |
| Exact Mass | 79.95681503 |
| Monoisotopic Mass | 79.95681503 |
| Topological Polar Surface Area | 52.2 |
| Heavy Atom Count | 4 |
| Boiling Point | 44.8 °C |
|---|---|
| Melting Point | 62.2 °C |
| Melting Point | 17 °C |
| Vapor Density | 2.76 (Air = 1) |
| Vapor Pressure | 263.0 [mmHg] |
| Heat of Vaporization | 43.14 kJ/mol at 25 °C |
SULFUR TRIOXIDE; 7446-11-9; Sulphur trioxide; Sulfur oxide (SO3); HH2O7V4LYD; DTXSID1029673; CHEBI:29384; Sulfan; Sulfuric oxide; RefChem:6276; Sulfur trioxide, stabilized; DTXCID409673; 231-197-3; Sulfuric anhydride; Sulfite radical anion; Sulfur trioxide, contains stabilizer, >=99%
| GHS notification summary | 14.9% (75 / 503) |
|---|
| GHS notification summary | 14.9% (75 / 503) |
|---|---|
| Reported hazard statements | H314 (85.1%), H318 (49.3%), H330 (16.1%), H335 (79.9%), H351 (11.3%), H411 (11.3%) |
This chemical does not meet GHS hazard criteria for 14.9% (75 of 503) of reports.
H314 (85.1%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]
Sulfur trioxide · CAS 7446-11-9 · O3S. UNII HH2O7V4LYD. Boiling Point: 44.8 °C; Melting Point: 62.2 °C; Melting Point: 17 °C.
数据来源：PubChem / Wikidata；与随货 COA 不一致时以 COA 为准。
English page: Sulfur trioxide