Patent ID: 9206140
Filing Date: 2015-12-08
Classification: C07D

Abstract:
1. A method for recycling water in a melamine production process comprising: a wet process comprising an aqueous treatment of a melamine melt from a melamine synthesis plant with an aqueous alkali containing solution, wherein the aqueous treatment comprises quenching of a melamine melt from a melamine synthesis plant after off-gas separation with NaOH or KOH solution, and crystallisation for providing solid melamine and a triazine containing alkaline mother liquor, a wastewater treatment process comprising thermal treatment of said triazine containing alkaline mother liquor, wherein the thermal treatment comprises a thermal hydrolysis stage performed at a temperature of between 200 to 260° C., and a recycling process, wherein at least parts of the thermally treated alkaline mother liquor are being recycled to the wet process.