Molecular Formula | C5H11O5PS |
Molar Mass | 214.18 |
Density | 1.294±0.06 g/cm3(Predicted) |
Boling Point | 247.0±42.0 °C(Predicted) |
Physical and Chemical Properties | Chemical properties The pure oxysulfur phosphate is a colorless transparent liquid with a relative density of 1.3~1.32, and the industrial product is a light yellow transparent liquid with a relative density of about 1.3. It is easily soluble in organic solvents such as chloroform and alcohol. It is easy to decompose and explode within a few minutes when heated to 150 ℃. |
Use | Uses O,O-dimethyl-S-(methoxycarbonylmethyl) phosphorothioate, short for phosphorothioate, is an intermediate of The organophosphorus insecticide omethoate. |
EPA chemical information | Acetic acid, [(dimethoxyphosphinyl)thio]-, methyl ester (57212-78-9) |
The preparation method is that ammonium salt and methyl chloroacetate undergo a liquid-liquid heterogeneous reaction to obtain oxysulfur phosphate. The reaction equation is shown in the figure:
1150kg ammonium salt, 1300kg methyl chloroacetate and a certain amount of phase transfer catalyst were added in a 1000L reactor, reacted at 58~64 ℃ for 80min, and then stratified. The lower crude ester is distilled in a 1500L refining kettle, and methyl chloroacetate is distilled to recover and apply. The vacuum at the end point of distillation is controlled to be ≤ 93kPa and the temperature is ≤ 120 ℃ to obtain refined oxysulfur phosphate. The reaction has a small heat release and a mild reaction. In the production process, methyl chloroacetate is used in excess, which can not only increase the conversion rate of ammonium salt, but also protect the generated oxysulfur phosphate.