COATING METHOD ON THE INNER WALLS OF THE REACTION TUBES IN A HYDROCARBON PYROLYSIS REACTOR.

摘要

A method of on line coating a coat film on the inner wall of a reaction tube in a hydrocarbon pyrolysis reactor for preventing the formation and the deposit of coke on the inner walls. This method comprises the steps of vapor depositing a mixed solution of a metal alkoxide and a chromic compound on the inner walls concurrently with introducing a carrier at a flow rate of 1 5000 kg hr coil at a temperature of 600 900 C under a pressure of 0 3 kg cm2 to form a buffer layer on the inner walls; and vapor depositing a metal alkoxide as a barrier on the buffer layer; and vapor depositing an alkali metal alkaline earth metal compound alone or mixed with metal alkoxide as a decoking layer on the barrier. A decoking layer may further be provided on the diffusion barrier.