Process for preparing carbamate, urea and their derivatives as well as 2-oxzolidone

Abstract

The present invention discloses preparation of nitrogen containing carbonyl compound, and is especially the process of preparing carbamate, urea and their derivatives as well as 2-oxazolidone through oxidizing and carbonylating organic amine compound in the presence of one kind of multifunctional catalyst. By using salt of VIII metal and Cu as main metal catalyst and the ionic solution of halogenated pyridine salt, quaternary ammonium salt or quaternary phosphate salt as co-catalyst and through oxidizing and carbonylating organic amine compound, carbamate, urea and their derivatives as well as 2-oxazolidone may be prepared at oxygen pressure of 0.2-1.0 MPa, CO pressure of 1.0-4.0 MPa, reaction temperature of 80-220 deg.c, and in reaction time of 0.5-4 hr. Compared with the technological process adopting traditional catalyst, the present invention has the advantages of simple system, easy preparation, mild reaction condition and high selectivity.

Description

technical field [0001] The invention relates to a method for preparing nitrogen-containing carbonyl compounds, in particular to the preparation of carbamate, urea and its derivatives and 2-oxazolidinone by selecting a multifunctional catalyst and oxidative carbonylation of organic amine compounds method. Background technique [0002] Urethane, urea and its derivatives, and 2-oxazolidinone are a class of nitrogen-containing carbonyl compounds and are important fine chemical intermediates. When the organic amines are prepared by oxidative carbonylation, due to the difference in the selected catalysts and process operating conditions, their production and preparation have received extensive attention. [0003] Hirai (USP 4170708), Scholl (USP 4490551) and Moy (USP 4242520; 4258201) and others successively used selenium, sulfur, and tellurium as catalysts to prepare urea and carbamate by oxidative carbonylation of amine compounds. Zajacek et al. (USP3956360) disclosed a method...

AI Technical Summary

Problems solved by technology

However, these methods cause a large amount of chlorine and bromine plasma in the reaction liquid, which can easily cause corrosion of equipment under high temperature and high pressure conditions, and are used as cocatalysts to activate deactivated main metal catalysts by redox, but they are very It is difficult to return to the original state, and it needs to be re-added as the reaction progresses, which increases the cost of catalyst use

Images