thiobismethane
Methyl sulfide
CAS: 75-18-3
Molecular Formula: C2H6S
thiobismethane - Names and Identifiers
| Name | Methyl sulfide |
| Synonyms | DMS Thiopropane Methylsulfide 2-Thiapropane Methyl sulfide thiobismethane Sulfide, methyl- Methyl thioether sulfuredemethyle Dimethyl Sulfide methylmonosulfide Dimethyl sulphide Methylthiomethane sulfure-de-methyle Sulfure de methyle Methyl Monosulfide methanethiomethane sulfuredemethyle[french] |
| CAS | 75-18-3 |
| EINECS | 200-846-2 |
| InChI | InChI=1/C2H6S/c1-3-2/h1-2H3 |
| InChIKey | QMMFVYPAHWMCMS-UHFFFAOYSA-N |
thiobismethane - Physico-chemical Properties
| Molecular Formula | C2H6S |
| Molar Mass | 62.13 |
| Density | 0.846g/mLat 25°C(lit.) |
| Melting Point | −98°C(lit.) |
| Boling Point | 38°C(lit.) |
| Flash Point | −34°F |
| JECFA Number | 452 |
| Water Solubility | 溶于乙醇和乙醚，不溶于水。 |
| Solubility | Miscible with alcohols, ethers, esters, ketones, aliphatic and aromatic hydrocarbons. Slightly miscible with |
| Vapor Presure | 26.24 psi ( 55 °C) |
| Vapor Density | 2.1 (vs air) |
| Appearance | Liquid |
| Specific Gravity | 0.849 (20/4℃) |
| Color | Clear colorless |
| Odor | Ethereal, permeating; disagreeable; offensive. |
| Exposure Limit | ACGIH: TWA 10 ppm |
| Merck | 14,6123 |
| BRN | 1696847 |
| Storage Condition | Store at +2°C to +8°C. |
| Stability | Stable. Incompatible with strong oxidizing agents. Highly flammable - note low boiling point, low flash point, and wide explosion limits. Mixtures with air are potentially explosive. Incompatible with |
| Explosive Limit | 2.2-19.7%(V) |
| Refractive Index | n20/D 1.435(lit.) |
| Physical and Chemical Properties | Colorless transparent volatile liquid. There is an unpleasant smell. melting point -83 ℃ boiling point 37.5 ℃ relative density 0.845 refractive index 1.4438 flash point -17.8 ℃ soluble in ethanol and ether, insoluble in water. |
| Use | For the preparation of dimethyl sulfoxide and as pesticide intermediates or solvents |
thiobismethane - Risk and Safety
| Risk Codes | R11 - Highly Flammable R22 - Harmful if swallowed R37/38 - Irritating to respiratory system and skin. R41 - Risk of serious damage to eyes R36 - Irritating to the eyes |
| Safety Description | S7 - Keep container tightly closed. S9 - Keep container in a well-ventilated place. S16 - Keep away from sources of ignition. S29 - Do not empty into drains. S33 - Take precautionary measures against static discharges. S36/39 - S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. |
| UN IDs | UN 1164 3/PG 2 |
| WGK Germany | 1 |
| RTECS | PV5075000 |
| FLUKA BRAND F CODES | 13 |
| TSCA | Yes |
| HS Code | 2930 90 98 |
| Hazard Class | 3 |
| Packing Group | II |
| Toxicity | LD50 orally in Rabbit: 535 mg/kg LD50 dermal Rabbit > 5000 mg/kg |
thiobismethane - Upstream Downstream Industry
| Raw Materials | Methanethiol,sodium salt Dimethyl sulfate Dimethyl sulfate |
| Downstream Products | Methyl sulfoxide |
thiobismethane - Nature
Open Data Verified Data
colorless transparent volatile liquid, flammable and explosive. Highly toxic. There is an unpleasant smell. Soluble in ethanol and ether, insoluble in water. The relative density was 0.845. Melting Point -83 °c. Distillation range 36~39 ℃, refractive index 1. 4438. Boiling point 37.5 °c. Spontaneous ignition point of 206.1 deg C, flash point -17.8 deg C, flammable in the air range of 2.2% ~ 19.7%.
Last Update：2024-01-02 23:10:35
thiobismethane - Preparation Method
Open Data Verified Data
- methanol and carbon disulfide synthesis method methanol and carbon disulfide are mixed uniformly according to the theoretical ratio, metered, heated, and sent to the reactor for reaction, and the reaction gas is condensed and refined to obtain a finished product.
- methanol and hydrogen sulfide synthesis method methanol and hydrogen sulfide are mixed in a certain proportion, after preheating into a catalytic reactor for reaction, the reactants are separated to remove water, and then distilled to obtain a finished product.
- synthesis of dimethyl sulfate and sodium sulfide
Last Update：2022-01-01 10:37:46
thiobismethane - Use
Open Data Verified Data
This product is a solvent, is the production of dimethyl sulfoxide, methionine and pesticide intermediates. It can be used as a solvent for organic synthesis, polymerization and cyanation. Used for analytical testing, spinning of polyacrylonitrile and other synthetic fibers and in hydraulic fluids. It can also be used as a gas for city gas
Odor agent, industrial purification agent, coating stripping agent, battery low temperature preservative, pesticide penetrant, etc. Topical use in blood medicine, plant pathology, and nutrition.
Last Update：2022-01-01 10:37:45
thiobismethane - Safety
Open Data Verified Data
- This product is toxic. Low concentrations of dimethyl sulfide vapor generally cause Nausea, loss of appetite, high concentrations of vapor on the central nervous system paralysis. Production process to be closed, to prevent running, run, drop, leakage. Ventilation should be strengthened at the production site, and the operator should wear protective equipment. Poisoning should be promptly moved to fresh air, and ask a doctor for treatment.
- stainless steel pressure barrel packaging. Storage and transportation should be away from the heat source, fire, explosion. According to the provisions of flammable and toxic chemicals storage and transportation.
Last Update：2022-01-01 10:37:47
thiobismethane - Reference Information
| FEMA | 2746 | METHYL SULFIDE |
| olfactory Threshold | 0.003ppm |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Application | dimethyl sulfide is the simplest thioether compound. The structure and properties are similar to those of dimethyl ether. It is a colorless volatile liquid at room temperature. A substance with a special odor like seafood. In nature, it is often produced by the decomposition of proteins. This is also one of the sources of the smell of seafood. Can be used as a second step in organic synthesis, such as ozonation, for the reduction of the secondary ozone oxide 1,2, 4-trioxopentanone, to completely convert olefins to aldehydes or ketones, can also be used as a polymerization solvent, can also be used for the production of pesticides, methyl thiamine and dimethyl sulfoxide, and as Analytical reagents and gas odor, paint stripping. used in the preparation of dimethyl sulfoxide and as a pesticide intermediate or solvent GB 2760-96 is defined as an allowable flavor. Mainly used in the preparation of corn, tomato, potato, dairy products, pineapple and orange fruit flavor and cyan flavor. This product is a solvent, is the production of dimethyl sulfoxide, methionine and pesticide intermediates. It can be used as a solvent for organic synthesis, polymerization and cyanation. Used as analytical reagents, polyacrylonitrile and other synthetic fiber spinning and hydraulic oil aspects. It can also be used as an odor-generating agent for city gas, an industrial purifying agent, a coating stripping agent, a battery low-temperature preservative, a pesticide penetrant, and the like. Topical use in blood medicine, plant pathology, and nutrition. It is used as a solvent, a catalyst, and the like for many inorganic compounds. |
| preparation | dimethyl sulfate and sodium sulfide were reacted at 80-90°C. The reaction of methanol and carbon disulfide was catalyzed by aluminum hydroxide at 300°C. With activated alumina catalyzed methyl mercaptan at high temperature to remove hydrogen sulfide. |
| content analysis | The content was determined by gas chromatography in GT-10-4 using a polar column. |
| toxicity | GRAS(FEMA). |
| production method | there are dimethyl sulfate method, carbon disulfide method, hydrogen sulfide method and black liquor method depending on the raw materials used. 1. Dimethyl sulfate method dimethyl sulfate and sodium sulfide react at 80-90 ℃ to form dimethyl sulfide. Carbon disulfide methyl alcohol and carbon disulfide in 300 deg C, aluminum hydroxide catalyzed reaction of dimethyl sulfide. 3. Hydrogen sulfide method methanol is dehydrated to dimethyl ether at high temperature using activated alumina as catalyst, and dimethyl ether is reacted with hydrogen sulfide to form dimethyl sulfide under the action of catalyst. 4. Papermaking black liquor process in the pulping process, about 62% of the non-fibrous matter is dissolved in the cooking liquor, which is commonly known as "black liquor" which contains a large amount of lignin. The black liquor is reacted with sulfur or sodium sulfide under high temperature and high pressure, so that the methoxy group of lignin is separated and the sulfur ion is combined to form dimethyl sulfide. obtained by the reaction of potassium sulfide and methyl chloride in methanol. It is obtained by heating methanol with carbon disulfide or hydrogen sulfide for gas phase reaction. |
| category | flammable liquid |
| toxicity grade | poisoning |
| Acute toxicity | oral-rat LD50: 3300 mg/kg; Oral-mouse LD50: 3700 mg/kg |
| stimulation data | Skin-rabbits 500 mg/24 h mild; eye-rabbit 250 μg/24 h severe |
| explosive hazard characteristics | explosive when mixed with air |
| flammability hazard characteristics | in case of fire, high temperature, oxidant flammable; toxic sulfur oxide smoke from combustion |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; Stored separately from oxidants and acids |
| extinguishing agent | dry powder, dry sand, carbon dioxide, foam, 1211 extinguishing agent |
| Occupational Standard | TWA 1 mg/m3; Tel 50 mg/m3 |
| spontaneous combustion temperature | 402 ° F. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 15:16:52
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Raw Materials for thiobismethane
Downstream Products for thiobismethane