Diffusion coated ethylene furnace tubes

Details Diffusion coated ethylene furnace tubes Diffusion coated ethylene furnace tubes

1996-08-23

1999-02-23

Campbell, Eggerton A.

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

427205, C23C 2270, B05D 136

Patent

active

058739513

ABSTRACT:
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 ethelyene is produced using furnace tubes which are coated in this manner less coking occurs.

REFERENCES:
patent: 4004047 (1977-01-01), Grisik
patent: 4310574 (1982-01-01), Deadmore et al.
patent: 4500364 (1985-02-01), Krutenat
patent: 4904301 (1990-02-01), Davis
patent: 5135777 (1992-08-01), Davis et al.
Patent Abstract of Japan, vol. 012, No. 015 (C-469), Jan. 16, 1988, of Japanese Patent Application No. 61013372, published Jul. 27, 1987.
Reprint from Oil & Gas Journal, "Aluminized ethylene furnace tubes extend operating life," Reprinted from the Aug. 31, 1987 edition of Oil & Gas Journal, Copyright 1987 by PennWell Publishing Company.
"A Study Of The Results Of 31/2 Years of Exposure Of Alonzied Tubes In An Ethylene Pyprolysis Furnace," Nov., 1984.
"Use alloys to improve ethylene proudction," Hydrocarbon Processing, Mar., 1996, pp. 53-61.
"Update in Alloy Selection for Ethylene Furnaces" by Steanson B. Parks and C. M. Schillmoller, A.I.Ch.E Spring Meeting, Mar. 19-23, 1995.

Affiliated with

Also associated with

Rating

Diffusion coated ethylene furnace tubes does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Diffusion coated ethylene furnace tubes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Diffusion coated ethylene furnace tubes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-303032