Purity: 98%
Alias: mercaptomethane
Chemical formula: CH3SH
Molecular weight: 48.10750
CAS registration number: 74-93-1
EINECS registration number: 200-822-1
Melting point: -123 ℃
Boiling point: 6 ℃
Water solubility: insoluble
Appearance: colorless gas
Gas introduction
Physical and chemical properties of methyl mercaptan
Methyl mercaptan (74-93-1) is highly toxic and irritating. It is a colorless gas at room temperature and a colorless liquid at low temperature. It has a strong odor similar to rotten cabbage heart. It is flammable, almost insoluble in water, and soluble in organic solvents.
Uses of methyl mercaptan
Methyl mercaptan can be used to synthesize pesticide raw materials (such as insecticides methhomyl and fenthion, herbicides cypermethrin and promethazine), pharmaceuticals (such as methionine, lysine and tryptophan), spices, wool dyeing auxiliaries, polymerization catalysts, dehydrating agents, electroplating agents, corrosion inhibitors, etherification accelerators, stabilizers, drying oil solidification accelerators, gas odorizers, etc.
Hazards of methyl mercaptan
Its vapor has a hypnotic effect, similar to H2S, and has an anesthetic effect at high concentrations. After inhaling a large amount of vapor poisoning, it can paralyze the central nervous system, accompanied by cyanosis, cramps, headaches, nausea, etc.; severe cases can cause lung damage, liver damage, and even respiratory paralysis. Local contact can cause conjunctival and corneal opacity, etc. It is irritating to the skin and can cause congestion at the contact site.
It is flammable when exposed to open flames, high temperatures, and oxidants; combustion will produce toxic sulfur oxide (SO2) smoke; it can form an explosive mixture when mixed with air, so pay attention to the explosion hazard. It will produce toxic and flammable hydrogen sulfide gas when it comes into contact with water and acid.
Methyl mercaptan is a chemical occupational disease hazard factor in my country. According to GBZ2.1-2019. its occupational exposure limit is a time-weighted average permissible exposure concentration of 1 mg/m3. MAC and PC-STEL are not specified, and the critical adverse health effect is liver damage.
When workers enter the methyl mercaptan workplace, they should wear personal protective equipment, such as protective work clothes to prevent skin frostbite and chemical safety glasses to prevent eye contact from causing mucous membrane damage. Note: If work clothes become wet or contaminated, they should be changed immediately to avoid the risk of burns.
