Global Patent Index - EP 0380169 A1

EP 0380169 A1 19900801 - A process for the cleaning of metallic, for example iron or steel, internal surfaces of industrial equipment.

Title (en)

A process for the cleaning of metallic, for example iron or steel, internal surfaces of industrial equipment.

Title (de)

Reinigungsverfahren für die Innenflächen von industriellen Apparaten aus Metall, z.B. aus Eisen oder Stahl.

Title (fr)

Procédé de nettoyage pour des surfaces internes d'équipements industriels métalliques, par exemple en fer ou en acier.

Publication

EP 0380169 A1 19900801 (EN)

Application

EP 90200135 A 19900118

Priority

NL 8900106 A 19890118

Abstract (en)

Process for the cleaning during idle periods of metallic, for example iron or steel, internal surfaces of equipment used in the chemical industry, in which a cleaning fluid containing water, an acid and a corrosion inhibitor is pumped through the interior of the equipment at a flow rate of at least 0.5 m/s, whereby the cleaning fluid is passed through a reduction filter (1) disposed outside the equipment, which filter (1) contains a substantially metallic packing (5) with the highest practicable surface-to-weight ratio, and that the composition of the cleaning fluid is controlled during operation by measurement of the redox potential, which is maintained below a limiting value and amounts to nearly 280 mV or less, when measured with a platinum electrode against a saturated calomel-KCl electrode.

IPC 1-7

B01J 16/00; C23G 1/02; C23G 1/08

IPC 8 full level

C23G 1/02 (2006.01); C23G 1/08 (2006.01)

CPC (source: EP)

C23G 1/02 (2013.01); C23G 1/08 (2013.01)

Citation (search report)

  • [YD] US 3440170 A 19690422 - HEK JILLES DE
  • [A] DE 2457235 A1 19760610 - VODICKA PETER
  • [A] EP 0162491 A1 19851127 - SOLVAY [BE]
  • [A] US 3686123 A 19720822 - HIROSHI UEKI
  • [Y] CHEMICAL ABSTRACTS, vol. 103, no. 4, 29th July 1985, page 203, abstract no. 25764k, Columbus, Ohio, US; & CS-B-224 113 (M. HOLINKA) 01-11-1984
  • [A] CHEMICAL ABSTRACTS, vol. 83, no. 14, 6th October 1985, page 344, abstract no. 119514z, Columbus, Ohio, US; & JP-B-75 002 372 (SUMITOMO METAL INDUSTRIES) 25-01-1975

Designated contracting state (EPC)

BE DE ES FR GB NL

DOCDB simple family (publication)

EP 0380169 A1 19900801; EP 0380169 B1 19951108; DE 69023359 D1 19951214; DE 69023359 T2 19960425; ES 2081338 T3 19960301; NL 8900106 A 19900816

DOCDB simple family (application)

EP 90200135 A 19900118; DE 69023359 T 19900118; ES 90200135 T 19900118; NL 8900106 A 19890118