Diffusion coated furnace tubes for the production of ethylene

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 10/56 (2006.01) C10G 9/20 (2006.01) C23C 10/60 (2006.01) C23C 14/04 (2006.01) C23C 26/00 (2006.01)

Patent

CA 2227396

The inner surface of ethylene furnace tubes is diffusion coated with a sufficient amount of chromium or chromium and silicon to form a first coating having a thickness of at least two mils. This coating is then cleaned, neutralized, and grit blasted. Then a second coating of a sufficient amount of aluminum or aluminum and silicon is diffused onto the first coating to form a total coating thickness of at least five mils. The surface of the second coating is cleaned and polished to remove the nickel and iron-rich overlay which is present as a result of the coating process and to provide a smooth uniform surface. When ethylene is produced using furnace tubes which are coated in this manner less coking occurs.

La surface interne des tubes de fours servant à produire de l'éthylène est revêtue par diffusion d'une quantité suffisante de chrome ou de chrome et de silicium pour constituer un premier revêtement dont l'épaisseur est d'au moins deux mils. Ce revêtement est alors nettoyé et neutralisé, puis il est soumis à un sablage. Un deuxième revêtement constitué d'une épaisseur suffisante d'aluminium ou d'aluminium et de silicium est diffusé sur le premier revêtement pour donner une épaisseur de revêtement totale d'au moins cinq mils. La surface du deuxième revêtement est nettoyée et polie pour enlever la couche riche en fer et en nickel qui s'y trouve par suite du processus de revêtement et pour offrir une surface uniforme et lisse. La production d'éthylène au moyen de tubes de four revêtus de cette façon diminue la formation de coke.

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