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三酸化硫黄
硫黄(VI)トリオキシド · 無水硫酸 · 硫黄(VI)トリスオキシド · 三酸化イオウ · 三酸化硫黄（無水硫酸） · 三酸化硫黄 · SO3 · SULPHUR TRIOXIDE
識別子と物理属性
| CAS No. | 12210-38-7 |
|---|---|
| 分子式 | O3S |
| 平均分子量 | 80.07 g/mol |
| 単同位体質量 | 79.95681486 g/mol |
| SMILES | O=S(=O)=O |
| InChIKey | AKEJUJNQAAGONA-UHFFFAOYSA-N |
| PubChem CID | 24682 |
| ChEBI | CHEBI:29384 |
| EC No. | 231-197-3 |
| DTXSID | DTXSID1029673 |
| 現地名 | 三酸化硫黄 |
化学・物理的性質
| XLogP | -0.5 |
|---|---|
| 極性表面積 | 52.2 |
| 水素結合供与体数 | 0 |
| 水素結合受容体数 | 3 |
| 回転可能結合数 | 0 |
| 重原子数 | 4 |
| 形式電荷 | 0 |
| 複雑度 | 61.8 |
| 物質分類 | Toxic Gases & Vapors -> Other Toxic Gases & VaporsCarcinogens |
| SpringerMaterials Properties | Schoenflies notation |
| 密度 | 1.92 at 68 °F Gamma form (liquid) (EPA, 1998) - Denser than waterwill sinkCritical density: 0.630 g/cu cmRelative density (water = 1): 1.91.97 g/mL at 25 °C(lit.) |
| Color/Form | White needlesAsbestos-like needlesPure sulfur trioxide is a colorless liquid that fumes in air at room temperature and pressure. |
| 溶解度 | Slowly very sol in aqueous, and sol in 100 parts water at room tempSolubility in water: violent reactionreacts with H2O激しく反応する |
| Corrosivity | Absolute dry sulfur trioxide is not corrosive to metals |
| 沸点 | 113 °F at 760 mmHg all forms (EPA, 1998)Sublimes44.8 °C |
| Decomposition | When heated to decomposition ... emits toxic fumes of /sulfur oxides/. |
| 融点 | 144 °F Alpha form90.5 °F Beta form62.2 °F Gamma form (EPA, 1998)62.2 °CExists in three solid modifications: alpha, beta, and gamma. The alpha form seems to be the stable form but the solid transitions are commonly slowa given sample may be a mixture of the various forms and its melting point not constant.Physical form: asbestos-like needlesmelting point: 32.5 °Cvapor pressure: 344 mm Hg at 25 °C /beta-form/17 °C16.8 °C(lit.) |
| 蒸気密度 | 2.76 (EPA, 1998) - Heavier than airwill sink (Relative to Air)2.76 (Air = 1)Relative vapor density (air = 1): 2.82.8 (vs air) |
| Polymerization | Explosive polymerization in case of non-presence of stabilizer and presence of humidity. |
| 蒸気圧 | 73 mmHg at 77 °F Alpha form344 mmHg at 77 °F Beta form433 mmHg at 77 °F Gamma form (EPA, 1998)263.0 [mmHg]Vapor pressure: 73 mm Hg at 25 °C /alpha-form/Vapor pressure, kPa at 25 °C: 57.7280 mm Hg ( 25 °C) |
| 貯蔵条件 | Indoors |
| 外観・状態 | 無色の液体 |
| 色 | white needles |
| 比熱容量 | Cp(gas): 0.63 J/(g·K), at 25℃ |
| Merck | 13,9069 |
| ヘンリー定数 | 5.1×10-8 mol/(m3Pa) at 25℃, Hayer et al. (2022) |
| 誘電率 | 3.1(18℃) |
| 安定性 | 安定。有機材料、微粉末金属、アルカリ、水、シアン化物、その他多くの化学物質とは相溶しません。水、酸素および他の化学物質と激しく反応する。 |
| InChI | 1S/O3S/c1-4(2)3 |
| InChIKey | AKEJUJNQAAGONA-UHFFFAOYSA-N |
| SMILES | O=S(=O)=O |
| CAS データベース | 7446-11-9(CAS DataBase Reference) |
| NISTの化学物質情報 | Sulfur trioxide(7446-11-9) |
| EPAの化学物質情報 | Sulfur trioxide (7446-11-9) |
化学的特性
Sulfur trioxide, S03, also known as sulfuric anhydride, needles or polymer, exists in a number of modifications that differ in molecular species and crystalline form. It has a white,ice-like modification that melts at 16°C (61°F) and two other as bestos-like forms that melt at the higher temperatures of 33 and 62°C (90 and 144 °F). The colorless liquid or gas form has irritating, toxic fumes and boils at 45 °C (112 °F). Sulfur trioxide is a highly reactive substance, a strong oxidizing agent,and a fire hazard. It reacts with metallic oxides to form sulfates and with water to form sulfuric acid. Sulfur trioxide is used for sulfonation.
化学性质
刺激臭がある。α，β，γの3種の変態があり，安定化液体三酸化硫黄はγ型に安定化したものである。硫酸，発煙硫酸より強力な脱水作用を有し，金属に対する腐食性は小さい。有機化合物と反応するとき，水を生成することなく，スルホン基を導入することができる。
安全性と法規制
| GHS 分類 | This chemical does not meet GHS hazard criteria for 14.9% (75 of 503) of reports.DangerH314 (85.1%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]P203, P260, P261, P264, P264+P265, P271, P273, P280, P284, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P318, P319, P320, P321, P363, P391, P403+P233, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 503 reports by companies from 22 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies. |
|---|---|
| Hazards Identification | Toxic/poison by inhalation (TIH/PIH) |
| 規制情報 | Chemical: Sulfur trioxideStatus: Active Update: 21-11-2022 https://echa.europa.eu/registration-dossier/-/registered-dossier/15436Sulfur trioxide: Does not have an individual approval but may be used as a component in a product covered by a group standard. It is not approved for use as a chemical in its own right.The New Jersey Worker and Community Right to Know Act requires public and private employers to provide information about hazardous substances at their workplaces. (N.J.S.A. 34:5A-1 et. seq.) |
| 輸送ラベル（DOT） | Corrosive Poison Inhalation Hazard |
| 火災危険 | Fire risk in contact with organic materials. An explosive increase in vapor pressure occurs when the alpha form melts. Combines with water with explosive violence, forming sulfuric acid. May ignite other combustible materials (wood, paper, oil, etc.). Flammable poisonous gases may accumulate in tanks and hopper cars. Runoff to sewer may create fire or explosion hazard. Forms sulfuric acid on contact with water. Avoid water and organic materials. On exposure to air, it absorbs moisture and emits dense white fumes. (EPA, 1998)· EXCEPT FOR ACETIC ANHYDRIDE (UN1715), THAT IS FLAMMABLE, some of these materials may burn, but none ignite readily.Not combustible. Gives off irritating or toxic fumes (or gases) in a fire. Many reactions may cause fire or explosion. Heating will cause rise in pressure with risk of bursting. Risk of fire and explosion on contact with bases, combustible substances, reducing agents, water or organic materials. |
| 火災の可能性 | Material itself does not burn or burns with difficulty. |
| 健康有害性 | This material is highly toxic. It is an irritant and corrosive to mucous membranes. Poisonous if inhaled or swallowed. Contact causes severe burns to skin and eyes. (EPA, 1998)· CORROSIVE and/or TOXICinhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns or death. |
| 有害性の概要 | Highly corrosive to skin[Quick CPC] Can cause severe coughing at a concentration of 1 ppm[HSDB] When dry, rapidly absorbs moisture from air evolving dense white fumesReacts explosively with water forming sulfuric acid[Merck Index] A strong oxidant that poses a fire and explosion hazard on contact with organic materialsCorrosive to skin, eyes, and respiratory tractRepeated or prolonged exposure to aerosol may cause effects to the lungs and erosion of teeth[ICSC] Concentrations of 1 ppm may cause coughing, choking, and severe discomfortCauses severe burns to skin and eyesInhalation causes severe irritation and may cause pulmonary edemaCauses erosion and discoloration of teethHealth effects basically the same as those for sulfuric acid[IUCLID] Causes diffuse hepatitis, changes in bronchi, and other endocrine changes in inhalation lethal-concentration studies of guinea pigs[RTECS] See Sulfuric acid.The major hazards encountered in the use and handling of sulfur trioxide stem from its toxicologic properties and reactivity. Toxic by all routes (ie, inhalation, ingestion, and dermal contact), exposure to this colorless-to-white, crystalline solid may occur from its use in the sulfonation of oils and detergents, in the manufacture of sulfuric acid and explosives, and in solar energy collectors. Effects from exposure may include burns to the eyes, skin, and mucous membranes, shortness-of-breath, chest pain, and pulmonary edema. In activities and situations where over-exposure may occur, wear chemical protective clothing and a self-contained breathing apparatus. If contact should occur, irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes, and wash exposed skin thoroughly with soap and water. Contaminated clothing should be removed and left at the worksite for cleaning. While sulfur trioxide itself burns with great difficulty, it may react violently (explosively) with water, giving off heat and light. Also, organic materials, particularly those containing adsorbed or absorbed moisture, may be ignited by sulfur trioxide. For fires involving sulfur trioxide, extinguish with agent suitable for surrounding materials. If water is used, apply in flooding quantities as a fog, and from as far a distance as possible. Use dikes to prevent sulfur trioxide from entering water sources and sewers. Sulfur trioxide may be shipped domestically via air (cargo only), rail (cargo only), road, and water, in containers bearing the label, "Corrosive." Sulfur trioxide should be stored in air-tight containers, away from moisture. Before implementing land disposal of sulfur trioxide waste, consult with environmental regulatory agencies for guidance. |
| 輸送番号・ガイド（DOT） | 1829 137 |
| 反応性グループ | Acids, Strong Oxidizing |
| UN 分類 | UN Hazard Class: 8UN Pack Group: I |
| Special Reports | U.S. Dept Health & Human Services/Agency for Toxic Substances & Disease RegistryToxicological Profile for Sulfur Trioxide and Sulfuric Acid (December 1998). The ATSDR toxicological profile succinctly characterizes the toxicologic and adverse health effects information for a hazardous substance.[Available from, as of October 15, 2009: http://www.atsdr.cdc.gov/toxpro2.html#] |
| Reactivity Alerts | Strong Oxidizing Agent |
| 消火 | Keep unnecessary people awayisolate hazard area and deny entry. Stay upwindkeep out of low areas. Ventilate closed spaces before entering them. Wear positive pressure breathing apparatus and special protective clothing.NO water. In case of fire in the surroundings, use appropriate extinguishing media. In case of fire: keep drums, etc., cool by spraying with water. NO direct contact with water. |
| 応急処置措置 | Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer immediately for medical attention.Wear protective gloves when administering first aid. First rinse with plenty of water for at least 15 minutes, then remove contaminated clothes and rinse again. Refer immediately for medical attention .Rinse with plenty of water for several minutes (remove contact lenses if easily possible). Refer immediately for medical attention.Rinse mouth. Give nothing to drink. Do NOT induce vomiting. Refer immediately for medical attention. |
| 漏出応急措置 | · CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not available or no answer, refer to appropriate telephone number listed on the inside back cover.· Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. |
| 応急処置 | Warning: Sulfur trioxide is extremely corrosive. Caution is advised.General First Aid: |
| 安全保管 | Refer to the manufacturer's instructions for proper storage conditions. Dry. Well closed. Store only in original packaging. Separated from food and feedstuffs and incompatible materials. See Chemical Dangers. Store only if stabilized. |
| 暴露管理・個人防護 | · Wear positive pressure self-contained breathing apparatus (SCBA).TIH (Toxic Inhalation Hazard) - Term used to describe gases and volatile liquids that are toxic when inhaled. Some are TIH materials themselves, e.g., chlorine, and some release TIH gases when spilled in water, e.g., chlorosilanes. [ERG 2016]. |
| 消火手順 | If material involved in fire: Extinguish fire using agent suitable for type of surrounding fire ... Use water in flooding quantities as fog. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.NO hydrous agents. NO water. In case of fire in the surroundings: use appropriate extinguishing media ... Cool drums, etc., by spraying with water but avoid contact of the substance with water. |
| 保管条件 | /When/ stabilized, must be kept warm to liquefy, but under 40 °C. |
| 清掃方法 | SRP: Wastewater from contaminant suppression, cleaning of protective clothing/equipment, or contaminated sites should be contained and evaluated for subject chemical or decomposition product concentrations. Concentrations shall be lower than applicable environmental discharge or disposal criteria. Alternatively, pretreatment and/or discharge to a permitted wastewater treatment facility is acceptable only after review by the governing authority and assurance that "pass through" violations will not occur. Due consideration shall be given to remediation worker exposure (inhalation, dermal and ingestion) as well as fate during treatment, transfer and disposal. If it is not practicable to manage the chemical in this fashion, it must be evaluated in accordance with EPA 40 CFR Part 261, specifically Subpart B, in order to determine the appropriate local, state and federal requirements for disposal.Evacuate danger area! Consult an expert! Do NOT absorb in saw-dust or other combustible absorbents. Absorb remaining liquid in dry sand or inert absorbent and remove to safe place. Ventilation. NEVER direct water jet on liquid. Do NOT let this chemical enter the environment. |
| 非火災時の漏出対応 | Excerpt from ERG Guide 137 [Substances - Water-Reactive - Corrosive]: |
| 処分方法 | SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational harm/injury/toxicity or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air qualitypotential migration in soil or watereffects on animal and plant lifeand conformance with environmental and public health regulations. |
| 漏出処分 | Evacuate danger area! Consult an expert! Personal protection: chemical protection suit including self-contained breathing apparatus. Do NOT let this chemical enter the environment. Do NOT wash away into sewer. Ventilation. Collect leaking liquid in covered containers. Absorb remaining liquid in dry sand or inert absorbent. Do NOT absorb in saw-dust or other combustible absorbents. Then store and dispose of according to local regulations. |
| 環境中動態 | Atmospheric Fate: Sulfur trioxide is a highly reactive gas, and in the presence of moisture in the air it is rapidly hydrated to sulfuric acid. In the air, therefore, it is sulfuric acid in the form of an aerosol that is found rather than sulfur trioxide, and in general, it is associated with other pollutants in droplets or solid particles extending over a wide range of sizes. |
| 有害作用 | Occupational hepatotoxin - Secondary hepatotoxins: the potential for toxic effect in the occupational setting is based on cases of poisoning by human ingestion or animal experimentation. |
| 暴露経路 | Serious local effects by all routes of exposure. The substance can be absorbed into the body by inhalation of its vapour. |
| Signs and Symptoms | Cough. Sore throat. Burning sensation. Shortness of breath. Laboured breathing.Redness. Pain. Blisters. Serious skin burns.Redness. Pain. Severe burns.Burns in mouth and throat. Burning sensation behind the breastbone. Abdominal pain. Vomiting. Shock or collapse. |
| ICSC Environmental Data | The substance is harmful to aquatic organisms. |
| Human Toxicity Excerpts | /SIGNS AND SYMPTOMS/ Sulfur trioxide and sulfuric acid mists are strongly irritants, and inhaling concn of approximately 3 mg/cu m causes a choking sensation. Persons accustomed to the exposure are unable to notice concn at this order of magnitude. Sulfur trioxide is irritating and corrosive to all mucous surfaces and causes inflammation of the upper respiratory tract and possible lung injury./SIGNS AND SYMPTOMS/ Lungs may be affected by repeated or prolonged exposure to an aerosol of this substance. Risk of tooth erosion upon repeated or prolonged exposure to an aerosol of this substance. Strong inorganic acid mists containing this substance are carcinogenic to humans./SIGNS AND SYMPTOMS/ Irritant and corrosive to mucous membranes. May cause coughing, choking and severe discomfort in a concn of 1 ppm./SIGNS AND SYMPTOMS/ Sulfur trioxide causes pulmonary skin and eye damage since it forms sulfuric acid.For more Human Toxicity Excerpts (Complete) data for Sulfur trioxide (10 total), please visit the HSDB record page. |
| Non-Human Toxicity Excerpts | /GENOTOXICITY/ The 8-hydroxy-2'-deoxyguanosine (8-OHdG) formation and DNA damage by sulfur trioxide anion radicals (SO3.-) were investigated using ESR spin trapping, HPLC, and electrophoretic assays. Sulfite (SO3(2-) autoxidation generated both hydroxyl (.OH) and SO3.- radicals. Oxidation of SO3(2-) by chromium (VI) generated only SO3.- with much enhanced yield. Incubation of 2'-deoxyguanosine (dG) with SO3(2-) generated 8-OHdG albeit at low yield. Chromium (VI) enhanced the yield four-fold. Electrophoretic assays showed that SO3.- radicals generated by chromium (VI) oxidation of SO3(2-) caused DNA double strand breaks. The results demonstrate that SO3.- radicals are capable of causing dG hydroxylation and DNA double strand breaks. |
| Probable Routes of Human Exposure | NIOSH (NOES Survey 1981-1983) has statistically estimated that 56,102 workers (3,077 of these were female) were potentially exposed to sulfur trioxide in the US(1). |
| Antidote and Emergency Treatment | Treatment includes the use of oxygen, decontamination with special attention to the eyes, and monitoring for hypoxic ischemia. Treatment should include use of beta-agonists for bronchospasm, repeat pulmonary function tests, and monitoring for delayed pulmonary edema. Steroids, antibiotics, and nebulized sodium bicarbonate have not been adequately studied.Immediate first aid: Ensure that adequate decontamination has been carried out. If patient is not breathing, start artificial respiration, preferably with a demand-valve resuscitator, bag-valve-mask device, or pocket mask, as trained. Perform CPR as necessary. Immediately flush contaminated eyes with gently flowing water. Do not induce vomiting. If vomiting occurs, lean patient forward or place on left side (head-down position, if possible) to maintain an open airway and prevent aspiration. Keep patient quiet and maintain normal body temperature. Obtain medical attention. /Inorganic acids and related compounds/Basic treatment: Establish a patent airway (oropharyngeal or nasopharyngeal airway, if needed). Suction if necessary. Watch for signs of respiratory insufficiency and assist respirations if needed. Administer oxygen by nonrebreather mask at 10 to 15 L/min. Monitor for pulmonary edema and treat if necessary ... . Monitor for shock and treat if necessary ... . For eye contamination, flush eyes immediately with water. Irrigate each eye continuously with 0.9% saline (NS) during transport ... . Do not use emetics. Activated charcoal is not effective. For ingestion, rinse mouth and administer 5 ml/kg up to 200 ml of water for dilution if the patient can swallow, has a strong gag reflex, and does not drool ... . Do not attempt to neutralize because of exothermic reaction. Cover skin burns with dry, sterile dressings after decontamination ... . /Inorganic acids and related compounds/Advanced treatment: Consider orotracheal or nasotracheal intubation for airway control in the patient who is unconscious, has severe pulmonary edema, or is in severe respiratory distress. Early intubation, at the first sign of upper airway obstruction, may be necessary. Positive-pressure ventilation techniques with a bag valve mask device may be beneficial. Consider drug therapy for pulmonary edema ... . Consider administering a beta agonist such as albuterol for severe bronchospasm ... . Monitor cardiac rhythm and treat arrhythmias as necessary ... . Start IV administration of D5W /SRP: "To keep open", minimal flow rate/. Use 0.9% saline (NS) or lactated Ringer's(LR) if signs of hypovolemia are present. For hypotension with signs of hypovolemia, administer fluid cautiously. Consider vasopressors if patient is hypotensive with a normal fluid volume. Watch for signs of fluid overload ... . Use proparacaine hydrochloride to assist eye irrigation ... . /Inorganic acids and related compounds/ |
| Toxicity Data | LCLo (guinea pig) = 30 mg/m3/6hr |
| RAIS Toxicity Values | 0.12CALEPA0.001 |
| Non-Human Toxicity Values | LC50 Rat/male inhalation 1375 mg SO3/cu m 1 hrLC50 Rat/female inhalation 1136 mg SO3/cu m 1 hr |
| DHS Chemicals of Interest (COI) | Sulfur trioxide110000Toxic chemical that can be released at a facility. |
| 水環境危害等級（WGK） | 1 |
| TSCA 収載状態 | TSCA listed |
| RTECS 番号 | WT4830000 |
| 輸送番号（UN） | UN 1829 (SULPHUR TRIOXIDE, STABILIZED) |
| 危険文句（R） | 45-8-14-26-34-37-35 |
| 危険表示 | O,T+,C |
| 安全措置（S） | 53-17-26-36/37/39-45-8-25-30 |
| 危険等級 | 8Eye Dam. 1Skin Corr. 1ASTOT SE 3 |
| 包装等級 | I |
| 貯蔵分類 | 8B - Non-combustible corrosive hazardous materials |
| 有害物質データ | 7446-11-9(Hazardous Substances Data) |
用途
解説
三酸化硫黄．二酸化硫黄を白金海綿，V2O5，NOなどを触媒として直接酸素と反応させてつくる．気体ではSO3分子が存在し，Sを中心とする平面三角形型構造．原子間距離S-O0.143 nm．∠O-S-O120°．腐食性気体で，水とはげしく反応して硫酸となる．金属酸化物とは熱を発して反応し硫酸塩となる．固体には三つの変態が知られている．(1)斜方晶系三酸化硫黄(γ-SO3)．－80 ℃ 以下で気体を凝縮させると得られる．発煙性があり，無色の氷状の固体．融点16.8 ℃，沸点44.8 ℃．密度1.995 g cm－3(13 ℃)，1.97 g cm－3(20 ℃)．環状の三量体でS3O9分子からなる分子結晶．(2)絹糸光沢のアスベスト状三酸化硫黄(β-SO3)．25 ℃ 以下で痕跡の水の存在で斜方晶系SO3または液体SO3を放置すると得られる．融点32.5 ℃．四面体型のSO4のOでつながった無限らせん構造である．(3)もっとも安定なアスベスト状三酸化硫黄(α-SO3)．β-SO3を封管中で32.5 ℃ 以上に長くおくと得られる．融点62.2 ℃．液体のSO3は単量体と三量体の混合物で，ホウ酸を添加すると安定化し，純粋な状態では痕跡の水でたやすく重合する．強酸化剤，スルホン化剤，イオン交換樹脂の製造，硫酸製造などに用いられる．猛毒．
用途
硫黄VI酸化物は主に硫酸の製造に用いられています硫酸は肥料洗剤化学合成物質の生産など多岐にわたる産業で必需品とされておりその生産過程においてSO3が欠かせませんまた特定の化学合成反応における触媒としてまたは特定の有機合成反応における硫化剤としても使用されます
用途
合成洗剤用アルキルベンゼン，高級アルコール，エチレンオキシド付加物などのスルホン化および硫酸化，石油潤滑留分および芳香族炭化水素のスルホン化，クロロスルホン酸の合成，スルホンアミドの合成などに利用されている。
使用
Sulfur trioxide is used as an intermediate in the manufacture of sulphuric acid and oleum for sulphonation, in particular, of dyes and dye-stuffs, and for the production of anhydrous nitric acid and explosives. Solid Sulfur trioxide is marketed under such names as Sulphan and Triosul, and is used primarily for sulphonation of organic acids. Sulphur tetrafluoride is a fluorinating agent. Sulphur hexafluoride serves as a gaseous insulator in high-voltage electric installations. Sulphyryl fluoride is used as an insecticide and a fumigant. Sulfonation of organic compounds, especially nonionic detergents, solar energy collectors. It is usually generated in the plant where it is to be used.
一般的な説明
Sulfur trioxide, is a colorless to white crystalline solid which will fume in air. Often shipped with inhibitor to prevent polymerization. Sulfur trioxide reacts violently with water to form sulfuric acid with the release of heat. Sulfur trioxide is corrosive to metals and tissue. Sulfur trioxide causes eye and skin burns. Ingestion causes severe burns of mouth esophagus and stomach. The vapor is very toxic by inhalation. Sulfur trioxide is a fire risk when in contact with organic materials such as wood, cotton, fiberboard, etc.
使用用途
三酸化硫黄は、酸化剤、スルホン化剤、の製造、硫酸の製造などに使用されます。スルホン化剤は工業的な有機合成で広く用いられており、染料や中性洗剤などの工業的な製造工程に使用可能です。 三酸化硫黄は接触法の中間体でもあります。硫黄と酸素から製造したを触媒存在下で三酸化硫黄とし、発煙硫酸を経由して水と反応させると、高純度な濃硫酸を製造できます。
製法・合成法
調製方法
Sulfur trioxide is produced as an intermediate in manufacturing sulfuric acid by the contact process (See Sulfuric Acid). The process involves catalytic oxidation of sulfur dioxide to trioxide.Sulfur trioxide is prepared in the laboratory by heating fuming sulfuric acid, condensing its vapors, and collecting in a cool receiver. When vapors are condensed below 27°C in the presence of trace moisture, all three polymorphic phases of SO3 are produced. They can be separated by fractional distillation. Condensation of the vapors above 27°C forms the liquid variety of gamma-sulfur trioxide.
合成方法
硫酸プラント，重油燃焼装置などの排ガス中の二酸化硫黄を水酸化ナトリウムで処理して回収する方法がある。