Pyrolysis furnace tubes

Details Pyrolysis furnace tubes Pyrolysis furnace tubes

1997-10-28

1999-08-31

Caldarola, Glenn

Mineral oils: processes and products

Chemical conversion of hydrocarbons

With prevention or removal of deleterious carbon...

208132, 422240, 422241, 585648, 585920, C10G 912, C10G 914, C07C 404

Patent

active

059449810

ABSTRACT:
An improved method for cracking a hydrocarbon feedstock comprising passing the feedstock through furnace tubes at high temperatures. The improvement comprises tubes comprised of a nickel-cobalt alloy containing: nickel; 27.0-33.0 weight percent cobalt; 26.0-30.0 weight percent chromium; 2.4-3.0 weight percent silicon; 0.20-0.80 weight percent titanium; not more than 3.5 weight percent iron; not more than 1.5 weight percent manganese; not more than 1.0 weight percent columbium; not more than 1.0 weight percent molybdenum; not more than 1.0 weight percent tungsten; not more than 0.15 weight percent carbon; not more than 0.030 weight percent phosphorus; and not more than 0.015 weight percent sulfur. The improvement results in lower coking rates inside the furnace tubes, thus enhancing furnace efficiency and tube life.

REFERENCES:
patent: 3531394 (1970-09-01), Koszman
patent: 5446229 (1995-08-01), Taylor et al.

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