The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 06, 2001
Filed:
Mar. 12, 1999
Eric Lenglet, La Celle Saint Cloud, FR;
Jean-Pierre Burzynski, Sainte-Foy-les Lyon, FR;
Gérard Courteheuse, Rueil-Malmaison, FR;
Roland Huin, Montesson la Borde, FR;
Yves Gougne, Givors, FR;
Institute Francais du Petrole, Rueil Malmaison Cedex, FR;
Abstract
A steam-cracking process includes the injection, at at least one point upstream from a secondary quenching indirect exchanger (,), of particles with a mean size of between 0.02 and 4 mm, at a velocity speed in the exchanger of 20 to 180 m/s, in sufficient quantity to limit the rise in the output temperature of the effluents from the exchanger to a value that is less than 100° C. per month. At least 70% by weight of the quantity of injected particles is introduced downstream from primary quenching exchangers (,) and upstream from the inlet to the secondary quenching exchanger. At intervals, decoking of the pyrolysis pipes and primary quenching exchangers is carried out in the presence of air.