GB1023958A - Improvements in and relating to scale removal and ferrous metal passivation - Google Patents

Improvements in and relating to scale removal and ferrous metal passivation

Info

Publication number
GB1023958A
GB1023958A GB2747163A GB2747163A GB1023958A GB 1023958 A GB1023958 A GB 1023958A GB 2747163 A GB2747163 A GB 2747163A GB 2747163 A GB2747163 A GB 2747163A GB 1023958 A GB1023958 A GB 1023958A
Authority
GB
United Kingdom
Prior art keywords
acid
solution
ferrous metal
hydroxyalkylamine
edta
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
GB2747163A
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.)
Dow Chemical Co
Original Assignee
Dow Chemical Co
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 Dow Chemical Co filed Critical Dow Chemical Co
Publication of GB1023958A publication Critical patent/GB1023958A/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
    • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/19—Iron or steel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/04—Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (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)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

A process for removing iron oxides from, and passivating, ferrous metal e.g. steel surfaces, particularly in evaporators, boilers or heat exchangers, comprises contacting them with an aqueous alkaline solution, e.g. pH at least 8, prepared by mixing one or more of citric acid, nitrilotriacetic acid, N-2-hydroxyethylamino diacetic acid and alkylenepolyamine polycarboxylic acid, e.g. EDTA, N-2-hydroxyethyl EDTA, diethylenetriamine pentaacetic acid, propylene -1, 2 or 3-diamine tetraacetic acid or isomeric butylene-diamine tetraacetic acids, with water and adding sufficient ammonia, an amine and/or hydroxyalkylamine to render the solution alkaline. Preferably the amine or hydroxyalkylamine contains 1-5 carbon atoms per molecule, e.g. (di)methylamino-, (di)ethylamino-, methyl ethylamino-, propylamino-, trimethylamino-, butyl- or amylamino-, or the corresponding mono-, di-, tri-(alkano)amino-. The solution may be heated under pressure up to the decomposition temperature. Between 0.1% and 5% corrosion inhibitor may be added.
GB2747163A 1962-07-23 1963-07-11 Improvements in and relating to scale removal and ferrous metal passivation Expired GB1023958A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US21188562A 1962-07-23 1962-07-23

Publications (1)

Publication Number Publication Date
GB1023958A true GB1023958A (en) 1966-03-30

Family

ID=22788687

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2747163A Expired GB1023958A (en) 1962-07-23 1963-07-11 Improvements in and relating to scale removal and ferrous metal passivation

Country Status (4)

Country Link
BE (1) BE635216A (en)
DE (1) DE1517406A1 (en)
GB (1) GB1023958A (en)
NL (1) NL295657A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4758415A (en) * 1980-12-22 1988-07-19 Basf Corporation Process for removing soluble metal cations in iron oxide pigments
WO1999061179A1 (en) * 1998-05-22 1999-12-02 Siemens Aktiengesellschaft Method for cleaning a container
EP0976853A1 (en) * 1994-09-09 2000-02-02 Mobil Oil Corporation Method for removing alkaline earth metal sulfate scale from a boiler or heat exchanger with use of sonic energy
CN111593355A (en) * 2020-05-12 2020-08-28 中国大唐集团科学技术研究院有限公司西北电力试验研究院 Method for cleaning boiler of thermal power plant

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2023397B3 (en) * 1986-12-01 1992-01-16 Siemens Ag PROCEDURE FOR CLEANING A CONTAINER.
DE4216383A1 (en) * 1992-05-18 1993-11-25 Siemens Ag Process for cleaning a closed container
CZ306082B6 (en) * 2015-05-28 2016-07-27 Ladislav Šťastný Device for cleaning internal combustion engines

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4758415A (en) * 1980-12-22 1988-07-19 Basf Corporation Process for removing soluble metal cations in iron oxide pigments
EP0976853A1 (en) * 1994-09-09 2000-02-02 Mobil Oil Corporation Method for removing alkaline earth metal sulfate scale from a boiler or heat exchanger with use of sonic energy
WO1999061179A1 (en) * 1998-05-22 1999-12-02 Siemens Aktiengesellschaft Method for cleaning a container
GB2354773A (en) * 1998-05-22 2001-04-04 Siemens Ag Method for cleaning a container
AU757069B2 (en) * 1998-05-22 2003-01-30 Siemens Aktiengesellschaft Method for cleaning a container
GB2354773B (en) * 1998-05-22 2003-04-30 Siemens Ag Method for cleaning a container
US6695927B1 (en) * 1998-05-22 2004-02-24 Siemens Aktiengesellschaft Method and cleaning solution for cleaning a container
CN111593355A (en) * 2020-05-12 2020-08-28 中国大唐集团科学技术研究院有限公司西北电力试验研究院 Method for cleaning boiler of thermal power plant

Also Published As

Publication number Publication date
DE1517406A1 (en) 1970-01-15
BE635216A (en)
NL295657A (en)

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