Continuous pyrolysis and decoking process, paticularly applicable to the production of acetylene

摘要

Continuous pyrolysis and de-coking is carried out in a reaction zone (40), of a refractory material, aligned in one axial direction, which comprises a heating zone and subsequent cooling zone. The heating zone consists of at least 2 rows (1,2) parallel to the axis and separated by a partition (70) of refractory material between two successive rows, at least one of the rows (1) connecting with a supply (10,60) of a gaseous mixture containing a hydrocarbon (at least 1C) and water vapour, and the other (2) being connected to a non-hydrocarbon fluid (60) containing water vapour. The rows also comprise heaters (8) enclosed in sheaths (7) perpendicular to the axis of the reactor. The gaseous mixture is arranged to circulate in at least one row in the heating zone for pyrolysis to be effected and for the temperature to be at least 850 degrees C, at the exit of the zone; the water vapour is circulated in other rows at a similar temperature in a de-coking operation. Hydrocarbons and a de-coking effluent are recovered.