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GB1109743A - Scale removal - Google Patents

Scale removal

Info

Publication number
GB1109743A
GB1109743A GB358566A GB358566A GB1109743A GB 1109743 A GB1109743 A GB 1109743A GB 358566 A GB358566 A GB 358566A GB 358566 A GB358566 A GB 358566A GB 1109743 A GB1109743 A GB 1109743A
Authority
GB
United Kingdom
Prior art keywords
solution
copper
air
nitrogen
potassium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB358566A
Inventor
William Edward Bell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pfizer Inc
Original Assignee
Pfizer Inc
Charles Pfizer and Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pfizer Inc, Charles Pfizer and Co Inc filed Critical Pfizer Inc
Priority to GB358566A priority Critical patent/GB1109743A/en
Publication of GB1109743A publication Critical patent/GB1109743A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

Scale containing iron oxides, copper and copper oxides is removed from e.g. boiler and heat exchanger tubes, and the cleaned surfaces passivated using a neutral solution of ammonium citrate. The process is then continued with a pH of at least 9 until the copper content of the solution is constant. The solution may be agitated with air or nitrogen. Oxidizing agents, e.g. air, oxygen or nitrogen tetraoxide or the sodium, potassium or ammonium salts of persulphates, perchlorates, bromates and nitrites, potassium permanganate, or the sodium salt of nitrophenylsulphoric acid, may be added to the solution.
GB358566A 1966-01-26 1966-01-26 Scale removal Expired GB1109743A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB358566A GB1109743A (en) 1966-01-26 1966-01-26 Scale removal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB358566A GB1109743A (en) 1966-01-26 1966-01-26 Scale removal

Publications (1)

Publication Number Publication Date
GB1109743A true GB1109743A (en) 1968-04-10

Family

ID=9761119

Family Applications (1)

Application Number Title Priority Date Filing Date
GB358566A Expired GB1109743A (en) 1966-01-26 1966-01-26 Scale removal

Country Status (1)

Country Link
GB (1) GB1109743A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0268361A1 (en) * 1986-11-20 1988-05-25 Rem Chemicals, Inc. Solution, composition and process of refining metal surfaces
WO1995030781A2 (en) * 1994-05-05 1995-11-16 Sjunnesson Sales Acc Method of removing chloride ion or a compound thereof from a surface contaminated therewith
WO1998039110A1 (en) * 1997-03-06 1998-09-11 H.E.R.C. Products Incorporated Pipe system cleaning and in-line treatment of spent cleaning solution
GB2384185A (en) * 2001-12-06 2003-07-23 Barrie Mellor Cleaning method and apparatus comprising the use of dinitrogen tetraoxide
CN103147086A (en) * 2013-04-03 2013-06-12 济南瑞东实业有限公司 Ethylene cracking and cleaning agent and preparation method thereof

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0268361A1 (en) * 1986-11-20 1988-05-25 Rem Chemicals, Inc. Solution, composition and process of refining metal surfaces
AU582315B2 (en) * 1986-11-20 1989-03-16 Rem Chemicals, Inc. Composition and method for metal surface refinement
WO1995030781A2 (en) * 1994-05-05 1995-11-16 Sjunnesson Sales Acc Method of removing chloride ion or a compound thereof from a surface contaminated therewith
WO1995030781A3 (en) * 1994-05-05 1996-03-07 Sjunnesson Sales Acc Method of removing chloride ion or a compound thereof from a surface contaminated therewith
US5609692A (en) * 1994-05-05 1997-03-11 Chlor Rid International, Inc. Method of removing chloride ion or a compound thereof from a surface contaminated therewith
WO1998039110A1 (en) * 1997-03-06 1998-09-11 H.E.R.C. Products Incorporated Pipe system cleaning and in-line treatment of spent cleaning solution
GB2384185A (en) * 2001-12-06 2003-07-23 Barrie Mellor Cleaning method and apparatus comprising the use of dinitrogen tetraoxide
GB2384185B (en) * 2001-12-06 2003-12-17 Barrie Mellor Cleaning process
CN103147086A (en) * 2013-04-03 2013-06-12 济南瑞东实业有限公司 Ethylene cracking and cleaning agent and preparation method thereof
CN103147086B (en) * 2013-04-03 2015-04-08 济南瑞东实业有限公司 Ethylene cracking and cleaning agent and preparation method thereof

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