Patent ID: 6514563
Filing Date: 2003-02-04
Classification: B01J,C10G,C23C

Abstract:
A method of on-line coating a continuous coat film on an inner wall of the reaction tube in a hydrocarbon pyrolysis reactor for preventing the formation and deposit of cokes on the inner wall, comprising the steps of:vapor depositing a mixed solution of a metal alkoxide and a chromium compound on the inner wall, concurrently with introducing a carrier into the reaction tubes at a flow rate of 1-5000 kg/hr/coil at a temperature of 600-900Â° C. under a pressure of 0-3 kg/cm2 to form a buffer layer on the inner walls; and then vapor depositing a metal alkoxide as a diffusion barrier on the buffer layer, concurrently with introducing a carrier into the reaction tubes at a flow rate of 1-5000 kg/hr/coil at a temperature of 600-900Â° C. under a pressure of 0-3 kg/cm2, and then forming a decoking layer on the diffusion barrier by vapor depositing a mixture of an alkoxide and an alkaline metal compound or alkaline earth metal compound, concurrently with introducing a carrier into the reaction tubes at a flow rate of 1-5000 kg/hr/coil at a temperature of 600-900Â° C. under a pressure of 0-3 kg/cm2.