Carbaryl

Carbaryl is a colorless to light tan or white or gray, solid crystals depending on the purity of the compound. The crystals are essentially odorless, and stable to heat, light, and acids, but are not stable under alkaline conditions. It is non-corrosive to metals, packaging materials, and application equipment. Carbaryl is classifi ed as a GUP. It is sparingly soluble in water, but soluble in dimethylformamide, DMSO, acetone, cyclohexanone, isopropanol, and xylene. Carbaryl is a wide-spect

Isocyanate method Preparation of isocyanate Methylamine and phosgene are directly subjected to gas phase color reaction at high temperature, and the reactor is a pipeline. The reaction temperature is greater than 400°C, and the reactor material is steel-lined graphite. Preventing the formation of by-products and eliminating reactor clogging are the keys in production. The main equipment of the isocyanate separation and refining system is a degassing gas tower. The refined isocyanate methyl tower is a 90-plate floating valve tower, all made of high-nickel alloy steel materials. The synthesis reaction of manacarb is carried out in the presence of a solvent at a temperature of 60 to 80°C with a slight negative pressure. The resulting mixed solution is distilled to distill off excess methyl isocyanate from the top of the distillation tower together with part of the solvent, and then reuse it. Manacarb is refined in solution to obtain pure product. Preparation of Naphthyl Chloroformate by Chloroformate Method Dissolve 100kg of menaphthol with 200kg of toluene and pump it into a 600kg toluene reactor, stir, cool to below -10℃, stop stirring, and pass 224kg of phosgene. After 4h. Start to add alkali, the temperature is controlled below 0 ℃, after 400-500kg of 20% H2O solution is dripped in about 2h, make the brine layer pH=6, exhaust the salt foot water, wash the mannathyl chloroformate twice, the general ester content is 14% to 15%. The synthesis temperature of Manacarb is maintained at 10-20°C, about 80kg of 40% monomethylamine is added dropwise at about 40min, then 120kg of 20% liquid alkali is added dropwise at about 10°C for about 20min, stirred for 10min and dropped into 30 % Hydrochloric acid 80kg, the measured pH value is 5-6. The product is obtained after separation, washing with water and drying. Preparation of methylcarbamoyl chloride by carbamoyl chloride method Methylcarbamoyl chloride is synthesized by chloroformylation of methylamine. The liquid phase method and the gas phase method are commonly used in industry, and the gas phase method has a higher yield and is convenient for continuity. The gas phase method is to heat methylamine to above 200°C and phosgene to above 150°C. After the two gases are mixed, they pass through a pipeline reactor of 240 to 300°C. The reaction is completed instantaneously, and then condensed into a liquid or pre-cooled chlorobenzene Or carbon tetrachloride cycle absorption. The main process conditions are: the ratio of monomethylamine to phosgene is 1:1.3 (volume ratio), the preheating temperature of methylamine and phosgene is 220～240℃, the reaction temperature is 280～300℃, the absorption temperature is 0～20℃ . Synthesis of Manacarb is made of sodium naphthol with dilute alkaline solution. When the temperature reaches 0～5℃, methylcarbamoyl chloride is added dropwise, and the alkaline solution is continuously replenished during the dropping process. When the pH value reaches 7.5 At ~8.0, the reaction will reach the end point, and the reaction time will take about 30-40 minutes. The finished product can be obtained by centrifugation, water washing and drying, with a content of more than 90%. Carbaryl synthesis can also be produced using solvent methods or solvent-free methods.

Contact insecticide.A broad-spectrum carbamate insecticide with high efficiency, low toxicity, low residue and long residual effect. It has a strong contact effect on pests, and has stomach poisoning effect, and has a slight systemic effect. Used to control cotton bollworm, leaf rollers, cotton aphid, bridge-building insects, thrips and rice leafhoppers, rice leaf rollers, rice bud insects, rice thrips and fruit tree pests, and also control vegetable garden snails, slugs and other software animal. The usual dose is 2.6-20g/100m2. Used to control rice planthoppers, leafhoppers, thrips, bean aphids, soybean borer, cotton bollworm, fruit tree pests, forestry pests, etc.

Molecular Weight:201.22
XLogP3:2.4
Hydrogen Bond Donor Count:1
Hydrogen Bond Acceptor Count:2
Rotatable Bond Count:2
Exact Mass:201.078978594
Monoisotopic Mass:201.078978594
Topological Polar Surface Area:38.3
Heavy Atom Count:15
Complexity:230
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes