Production technology of dimethyl phosphite

• Main Authors: DUAN LIYING, YU YUHAO, XU ZHANYOU, HUANG ZHONGGUI
• Format: Patent
• Language: Chinese; English
• Published: 29.06.2016
• Subjects: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

The invention provides a production technology of dimethyl phosphite. The preparation technology comprises the steps that methyl alcohol and phosphorus trichloride are slowly and relatively sprayed into an esterification reaction kettle in a mist mode, the upper half portion of the reaction kettle is filled with nitrogen, a reaction is performed to release heat, a condenser is adopted for condensation, and solid obtained in the esterification reaction kettle after the reaction is a dimethyl phosphite crude product; mist ammonia is slowly sprayed into the dimethyl phosphite crude product in a neutralization pot for neutralization, and the material in the neutralization pot is the mixture of dimethyl phosphite and ammonium chloride; the material in the neutralization pot is fed into a rectifying tower to be rectified to be completely distilled off, and a rectification residual solution of dimethyl phosphite is left; finally, the rectification residual solution is filtered through a molecular sieve and then rect