Gas to hydrogen process with co-production of carbon

A process of conversion of gaseous stream comprising methane into hydrogen (51, 63) and carbon (25), said process is characterized in that it comprises the following steps:

• a step (a) of providing a first gaseous stream (3, 7) comprising methane;
• a step (b) of bromination and synthesis of carbon wherein the first gaseous stream (3, 7) comprising methane of step (a) is put in contact with a second stream (53, 95, 127) comprising bromine under operating conditions resulting in the formation of a third stream (15) comprising methyl bromides and hydrogen bromide, and of a fourth stream (25) comprising carbon including graphite and/or carbon black;
• a step (c) of separation performed on the third stream (15) to recover a hydrogen bromide-rich stream (33, 41, 107) and a methyl bromides-rich stream (23), wherein the process comprises a step of recycling the methyl bromides-rich stream (23) into step (b) of bromination and synthesis of carbon;
• and
• a step (d) of converting said hydrogen bromide-rich stream (33, 41, 107) into a stream (51, 63) comprising hydrogen and a stream (53, 95, 127) comprising bromine.