Production technology of dimethyl phosphite

Abstract

The invention provides a production process of dimethyl phosphite, and its preparation process is as follows: first, methanol and phosphorus trichloride are sprayed into the esterification reaction kettle slowly and relatively in the form of mist, and at the same time, the upper half of the reaction kettle is filled with Nitrogen, the reaction is exothermic, and the condenser is used to condense. After the reaction is completed, the solid in the esterification reactor is crude dimethyl phosphite; secondly, slowly spray the crude dimethyl phosphite in the neutralization tank into atomized ammonia For neutralization, the material in the neutralization tank is a mixture of dimethyl phosphite and ammonium chloride; the material in the neutralization tank is sent to the rectification tower for rectification, all of which are distilled out, and the remaining rectification residue of dimethyl phosphite liquid; finally, the rectification raffinate is filtered through molecular sieves, and then the rectification raffinate is rectified. The invention can improve the purity of dimethyl phosphite, so that the purity of dimethyl phosphite is 95.6%.

Description

Technical field [0001] The invention relates to the field of fine chemical production, in particular to a production process of dimethyl phosphite. Background technique [0002] Dimethyl phosphite, molecular formula is C2H7O3P, molecular weight is 110.05, appearance is colorless transparent liquid, slightly scented, boiling point is 170℃, relative density is 1.20, soluble in water, soluble in most organic solvents such as alcohol and ether. The preparation method of dimethyl phosphite is prepared by the direct reaction of methanol and phosphorus trichloride. The specific methods are: solvent reaction and solvent-free reaction. Specific methods include vapor-liquid reaction, vapor-vapor reaction, discontinuous method, continuous method, etc. Because the reaction is a violent exothermic reaction, the reaction speed is fast, it is completed in an instant, the discontinuous operation is frequent, the labor intensity is high, and the production cycle is long, the equipment utilization...

AI Technical Summary

Problems solved by technology

The preparation method of dimethyl phosphite is obtained by the direct reaction of methanol and phosphorus trichloride. The specific methods include: solvent reaction and solvent-free reaction. The specific methods include vapor-liquid reaction, vapor-vapor reaction, discontinuous method, continuous method, etc. Because the reaction is a violent exothermic reaction, the reaction speed is fast, and it is completed in an instant. The discontinuous method is frequently operated, labor-intensive, and the production cycle is long, the utilization rate of equipment is low, and the production capacity is limited.