Coating method on inner walls of reaction tubes in hydrocarbon pyrolysis reactor

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...

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Bibliographische Detailangaben
1. Verfasser:	KANG SINOL,CHOI AHN-SEOP,CHO DONG-HYUN
Format:	Patent
Sprache:	eng
Schlagworte:	APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL CRACKING HYDROCARBON OILS DIFFUSION TREATMENT OF METALLIC MATERIAL FUELS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LUBRICANTS METALLURGY MINERAL WAXES PEAT PERFORMING OPERATIONS PETROLEUM, GAS OR COKE INDUSTRIES PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS REFORMING OF NAPHTHA SPRAYING OR ATOMISING IN GENERAL SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TECHNICAL GASES CONTAINING CARBON MONOXIDE THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	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/cm 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.