GB1198693A - Process for the Chemical Cleansing of Water and Steam Contacted Metal Surfaces. - Google Patents

Process for the Chemical Cleansing of Water and Steam Contacted Metal Surfaces.

Info

Publication number
GB1198693A
GB1198693A GB3554867A GB3554867A GB1198693A GB 1198693 A GB1198693 A GB 1198693A GB 3554867 A GB3554867 A GB 3554867A GB 3554867 A GB3554867 A GB 3554867A GB 1198693 A GB1198693 A GB 1198693A
Authority
GB
United Kingdom
Prior art keywords
acid
agent
steam
complex
acids
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
GB3554867A
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.)
Beratherm AG
Original Assignee
Beratherm AG
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 Beratherm AG filed Critical Beratherm AG
Publication of GB1198693A publication Critical patent/GB1198693A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • 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

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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

1,198,693. Cleaning metallic surfaces. BERATHERM A.G. Aug. 2, 1967 [Aug. 2, 1966], No.35548/67. Heading C7E. The internal metallic surfaces of steam power plants, heating systems, superheaters or boilers are cleaned by conveying a current of wet steam or gas along them and injecting into the current, in order a) a non-ionic wetting agent, b) 0-1-2% by weight of one or more acids known to form a complex with a metal, c) hydrazine and cyclic amines, or inhibited mineral acids with a pH range of 3-5 in the liquid phase, d) an agent for neutralization. Suitable complex-forming acids are citraconic acid anhydride, acetone di-carboxylic acid, gluconic acid, ethylene tetra-acetic acid and formic acid, and the neutralization agent may be an aqueous solution of ammonice and hydrazine with a pH of 8À5-10. Between the addition of the complex-forming acids and that of the neutralization agent, nitric acid may be injected. Preferably water under pressure and at 120-200‹ C. is forced into the apparatus to be cleaned, and turns to wet steam on entry. Subsequently the apparatus may be dried with superheated steam.
GB3554867A 1966-08-02 1967-08-02 Process for the Chemical Cleansing of Water and Steam Contacted Metal Surfaces. Expired GB1198693A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT740466A AT281541B (en) 1966-08-02 1966-08-02 Process for pickling metallic inner surfaces of closed vessels

Publications (1)

Publication Number Publication Date
GB1198693A true GB1198693A (en) 1970-07-15

Family

ID=3595713

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3554867A Expired GB1198693A (en) 1966-08-02 1967-08-02 Process for the Chemical Cleansing of Water and Steam Contacted Metal Surfaces.

Country Status (3)

Country Link
AT (1) AT281541B (en)
DE (1) DE1621541A1 (en)
GB (1) GB1198693A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2521159A1 (en) * 1982-01-18 1983-08-12 Dearborn Chemicals Co METHOD FOR CLEANING THE SHIRT OF A REACTOR AND SOLUTION FOR USE THEREIN
GB2157322A (en) * 1984-03-29 1985-10-23 Diversey Limited Removal of iron oxide deposits
EP0299166A1 (en) * 1987-07-17 1989-01-18 Mitsubishi Jukogyo Kabushiki Kaisha Method for removing scale on inner surfaces of boiler tube members
EP1598629A1 (en) * 2004-05-19 2005-11-23 Therm-Service für Kraftwerke und Industrie GmbH Method of chemical cleaning of a gas and vapor installation
EP2426322A1 (en) * 2010-09-06 2012-03-07 Siemens Aktiengesellschaft Fluid circuit for a power plant and method for chemical cleaning of same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999061179A1 (en) 1998-05-22 1999-12-02 Siemens Aktiengesellschaft Method for cleaning a container

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2521159A1 (en) * 1982-01-18 1983-08-12 Dearborn Chemicals Co METHOD FOR CLEANING THE SHIRT OF A REACTOR AND SOLUTION FOR USE THEREIN
GB2157322A (en) * 1984-03-29 1985-10-23 Diversey Limited Removal of iron oxide deposits
EP0299166A1 (en) * 1987-07-17 1989-01-18 Mitsubishi Jukogyo Kabushiki Kaisha Method for removing scale on inner surfaces of boiler tube members
EP1598629A1 (en) * 2004-05-19 2005-11-23 Therm-Service für Kraftwerke und Industrie GmbH Method of chemical cleaning of a gas and vapor installation
EP2426322A1 (en) * 2010-09-06 2012-03-07 Siemens Aktiengesellschaft Fluid circuit for a power plant and method for chemical cleaning of same
WO2012031913A1 (en) * 2010-09-06 2012-03-15 Siemens Aktiengesellschaft Fluid circuit for a power plant, and method for chemically cleaning a fluid circuit

Also Published As

Publication number Publication date
DE1621541A1 (en) 1970-07-30
AT281541B (en) 1970-05-25

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee