Reactor for the synthesis of melamine from urea, in accordance with the high-pressure non-catalytic process, comprising: a vertical reactor body (1), at least one inlet (2) for the urea melt, a set of heating elements (3), and a central duct (7), said set of heating elements (3) being arranged inside said central duct.

A reactor and associated process for the high-pressure synthesis of melamine from urea, comprising a primary step of conversion of the urea into crude melamine inside a first chamber delimited by a shell inside a reactor body and a secondary step of stripping said crude melamine melt inside a second reaction chamber, which is coaxial with and situated outside said first chamber, inside the same reactor body.

Reactor for the synthesis of melamine from urea, in accordance with the high-pressure non-catalytic process, comprising: a vertical reactor body (1), at least one inlet (2) for the urea melt, a set of heating elements (3), and a central duct (7), said set of heating elements (3) being arranged inside said central duct.

A reactor and associated process for the high-pressure synthesis of melamine from urea, comprising a primary step of conversion of the urea into crude melamine inside a first chamber delimited by a shell inside a reactor body and a secondary step of stripping said crude melamine melt inside a second reaction chamber, which is coaxial with and situated outside said first chamber, inside the same reactor body.

Methods and systems for producing a pressurized ammonia-containing gas stream from aqueous urea. The method comprising pumping an aqueous urea-containing solution to a fluid-tight enclosure at a rate to match the external demand for ammonia-gas, wherein a fluid heat transfer medium is applied to the exterior of the fluid-tight enclosure to transfer heat to the aqueous urea-containing solution sufficient to hydrolyze the solution to an ammonia gaseous product. The systems comprise means for carrying out the methods.

Reactor for the synthesis of melamine from urea, in accordance with the high-pressure non-catalytic process, comprising: a vertical reactor body (1), at least one inlet (2) for the urea melt, a set of heating elements (3), and a central duct (7), said set of heating elements (3) being arranged inside said central duct.