EP 0104012 A3 19850821 - COMPOSITION AND METHOD FOR SIMULTANEOUSLY REMOVING IRON AND COPPER SCALES FROM FERROUS METAL SURFACES
Title (en)
COMPOSITION AND METHOD FOR SIMULTANEOUSLY REMOVING IRON AND COPPER SCALES FROM FERROUS METAL SURFACES
Publication
Application
Priority
US 42099882 A 19820921
Abstract (en)
[origin: EP0104012A2] Compositions for simultaeously removing iron and copper scales from ferrous metal surfaces comprise water, one or more organic chelating acids which dissolve iron, one or more reducing agents selected from erythorbic acid, alkali metal salts of erythorbic acid, and ammonium salts of erythorbic acid, and, as copper complexing compound, thiourea and/or hexahydropyrimidine-2-thione. The compositions are utilized by contacting scale-containing ferrous metal surfaces therewith at temperatures of from about 75 DEG F (24 DEG C) to about 150 DEG F (66 DEG C).
IPC 1-7
IPC 8 full level
C23G 1/08 (2006.01)
CPC (source: EP)
C23G 1/088 (2013.01)
Citation (search report)
- [Y] US 3803042 A 19740409 - STOUT R, et al
- [A] DE 2457235 A1 19760610 - VODICKA PETER
- [A] DE 2040546 B1 19711202 - FELDMANN HAGEN
- [Y] CHEMICAL ABSTRACTS, vol. 78, no. 16, 23rd April 1973, page 223, no. 100930g, Columbus, Ohio, US; & JP-A-47 025 078 (TOKYO SHIBAURA ELECTRIC CO., LTD.) 19-10-1972
- [Y] CHEMICAL ABSTRACTS, vol. 84, no. 4, 1st January 1976, page 262, no. 21059a, Columbus, Ohio, US; & JP-A-50 033 933 (KURITA WATER INDUSTRIES, LTD.) 02-04-1975
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0104012 A2 19840328; EP 0104012 A3 19850821; CA 1204372 A 19860513; ES 525797 A0 19850301; ES 8503728 A1 19850301
DOCDB simple family (application)
EP 83304969 A 19830826; CA 437060 A 19830920; ES 525797 A 19830921