Production of carbaminate by amine reacted with dimethyl ester carbonate

Abstract

A process for preparing aminoformate from amine and dimethyl carbonate (DMC) features that under the existance of ionic liquid as solvent and catalyst system, the amine and DMC take part in catalytic oxo reaction at 40-200 deg.C for 0.5-5 hr. Its advantages are high output rate (more than 98%), high purity (more than 98%), high reaction activity, and easy recovery and cyclic use of catalyst.

Description

technical field

[0001] The invention relates to a method for preparing carbamate by reacting amine and dimethyl carbonate. Background technique

[0002] As a class of important organic reaction intermediates, isocyanates are widely used in industry, agriculture, medicine and health. These compounds are widely used in the synthesis of polyisocyanates, polyurethanes, polyureas, polymer adhesives, insecticides, herbicides, etc. At the same time, the demand for various isocyanates continues to grow with the development of society. At present, isocyanates are mainly prepared by reacting corresponding amine compounds with phosgene. Phosgene is a highly toxic compound, and a large amount of highly corrosive hydrogen chloride is generated during the reaction. Therefore, it often leads to equipment corrosion, phosgene leakage, environmental pollution and personal injury.

[0003] With the increasing environmental pollution around the world, governments of various countries are co...