Yellow to green-gray powder or flaky crystals. Soluble in benzene, soluble in ether and hot acetic acid, slightly soluble in alcohol and mineral oil, almost insoluble in petroleum ether; chloroform and water. Long-term storage color becomes deep, easy to oxidize under the sun, can sublimate. This product is mainly used as an excellent polymerization inhibitor for alkenyl monomers and is widely used in the production of acrylic acid, acrylate, methacrylate, and vinyl acetate. Also used in the synthesis of drugs, dyes, polyethers, antioxidants and rubber antioxidants. Also used in livestock insect repellents, fruit tree pesticides.
Mainly used as high-efficiency polymerization inhibitor of acrylic acid and acrylate, methacrylic acid and ester monomers
Safety term
Phenothiazine is an organic aromatic compound composed of sulfur and nitrogen atoms connecting two benzene rings (phenothiazine mother core). Those recrystallized from ethanol or benzene are orthorhombic yellow or gray-green prismatic crystals. The precipitated from toluene or butanol is yellow leaf-like crystals, which volatilize with water vapor. Insoluble in water, petroleum ether and chloroform, slightly soluble in ethanol and mineral oil, soluble in ether and acetone, easily soluble in benzene and hot acetic acid, solubility at 25 ° C (g / 100g): acetone 25.40, ethanol 3.40, benzene 32.0. Under sunlight and in the air, the color becomes darker, and 0.3% methylamine can be added to protect it during storage. It is easy to darken with impurities. Decomposes when meeting acid and acid vapor, and produces toxic nitrogen oxide and sulfur oxide gas.
Phenothiazine is sublimable, has a weak odor, is irritating to the skin, can cause macular rash, and can also be absorbed through the skin, causing visceral disorders. Oral LD50 of rats was 5000 mg / kg. The maximum allowable concentration in the workplace is 5mg / m3. The laboratory obtains by heating diphenylamine and sulfur at the same time until no hydrogen sulfide gas is released. Phenothiazine is an intermediate for the manufacture of methine blue dyes. It can also be used to make an important class of stabilizers and antihistamines such as chlorpromazine, perphenazine, promethazine, and methiopyrazine.
In addition, phenothiazine can also be used as a polymerization inhibitor for vinyl acetate, a raw material for rubber antioxidants, synthetic dyes, medicines, fruit tree insecticides and livestock insect repellents.
Grey-green cleansing powder. The melting point is 185.5 ° C, the boiling points are 371 ° C and 290 ° C (5.33kPa). It is insoluble in petroleum ether, chloroform and water, and soluble in ether and hot acetic acid. It is oxidized by light in the air.
Phenothiazine is an intermediate of fine chemicals such as drugs and dyes. It is itself an auxiliary agent for synthetic materials (polymerization inhibitor for the production of vinylon), a fruit tree insecticide and a veterinary insect repellent. It has significant effects on cattle, sheep, horses, gastrodia, tuberculosis, oral nematodes, nematodes, and nematodes of sheep.
It is mainly used as an efficient polymerization inhibitor for acrylic acid and acrylate, methacrylic acid and ester monomers.
Alias thiodiphenylamine. It is mainly used as a polymerization inhibitor for acrylate production. It is also used in the synthesis of drugs and dyes, as well as additives for synthetic materials (such as the polymerization inhibitor of vinyl acetate, the raw material of antioxidants for rubber). It is also used as an insect repellent for livestock and a pesticide for fruit trees.
This product is mainly used as an excellent polymerization inhibitor for alkenyl monomers and is widely used in the production of acrylic acid, acrylate, methacrylate, and vinyl acetate.
Diphenylamine is used as the raw material, and then obtained by sulfidation under the catalyst of iodine.
Mix diphenylamine, iodine tablets and sulfur, heat to 200 ° C for 2h, and then directly heat to 220-250 ° C with superheated steam. After the reaction material is separated from water, it is washed with a mixed solution of ethanol and urotropine (mass ratio 1.5: 1), and then dried and pulverized to obtain a product.
Operating precautions: closed operation, local exhaust. Operators must be specially trained and strictly abide by the operating procedures. It is recommended that operators wear self-priming filter dust masks, chemical safety protective glasses, anti-poison infiltration overalls, and rubber gloves. Away from fire and heat sources, smoking is strictly prohibited in the workplace. Use explosion-proof ventilation systems and equipment. Avoid generating dust. Avoid contact with oxidants. Handle with care when loading, avoid collision, overturning, and prevent the package from being damaged or leaking. Equipped with the corresponding variety and quantity of fire fighting equipment and leakage emergency treatment equipment. Empty containers may be harmful residues.
Storage precautions: Store in a cool, ventilated warehouse. Keep away from fire and heat sources. should be kept away from oxidizer, do not store together. Equipped with the appropriate variety and quantity of fire equipment. The storage area should be equipped with suitable materials to contain spills. [2]
Risk Overview
Health hazards: Harmful by inhalation, ingestion or percutaneous absorption. This product is irritating to eyes, skin, mucous membranes and upper respiratory tract. May cause convulsions.
Explosion hazard: This product is flammable and irritating. [2]
S26In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S29Do not empty into drains. Do not empty into drains.
S36 / 37/39 Wear suitable protective clothing, gloves and eye / face protection. Wear appropriate protective clothing, gloves and goggles or masks.
S61Avoid release to the environment. Refer to special instructions / safety data sheets. Refer to special instructions / safety data sheet. [2]
R36 / 38Irritating to eyes and skin.
R43 May cause sensitization by skin contact. May cause sensitization by skin contact.
R51 / 53 Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. Toxic to aquatic organisms, may have long-term adverse effects on the aquatic environment. [2]
