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:
Jul. 07, 1981
Filed:
Jul. 06, 1979
Alain Lectard, Aix-en-Provence, FR;
Robert Magrone, Gardanne, FR;
Aluminum Pechiney, Lyons, FR;
Abstract
A process for cleaning the walls of heat exchangers or reactors which are covered with essentially titaniferous incrustations but which can also contain silico-aluminous incrustations formed during the attack of ores and causing a considerable reduction in the heat exchange capacity, the said process being intended to restore the fundamental characteristics of the said walls, which is characterized in that the incrustations are removed by means of an aqueous treatment liquor containing from 3 to 30% by weight of hexafluosilicic acid and at most 10% by weight of hydrofluoric acid. The aqueous treatment liquor can contain a corrosion inhibitor and the treatment can be carried out at a temperature between 20.degree. C. and 80.degree. C.