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1. A process for the production of urea and melamine, wherein the production of urea comprises subjecting ammonia and carbon dioxide to a urea-forming reaction in a high-pressure urea synthesis section so as to obtain a high pressure urea synthesis solution, subjecting the urea synthesis solution to flashing, resulting in a flash vapour comprising ammonia and carbon dioxide, and a flashed urea liquid; subjecting the flashed urea liquid to treatment so as to obtain a urea product solution and a carbamate recovery vapour, said treatment comprising one or more ammonia and carbon dioxide liberating steps, thereby removing ammonia and carbon dioxide vapour from the flashed urea liquid, wherein the production of melamine comprises subjecting urea to a non-catalytic, high pressure melamine forming reaction, so as to obtain melamine and a melamine off-gas vapour comprising ammonia and carbon dioxide; and wherein the combined process comprises contacting at least part of the melamine off-gas with the flashed urea liquid before or during at least one of said ammonia and carbon dioxide liberating steps.
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