GB821094A - Improved method for descaling surfaces - Google Patents

Improved method for descaling surfaces

Info

Publication number
GB821094A
GB821094A GB25068/55A GB2506855A GB821094A GB 821094 A GB821094 A GB 821094A GB 25068/55 A GB25068/55 A GB 25068/55A GB 2506855 A GB2506855 A GB 2506855A GB 821094 A GB821094 A GB 821094A
Authority
GB
United Kingdom
Prior art keywords
acid
alkanolamine
hydrocarbon
diethanolamine
solvent
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
GB25068/55A
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 GB821094A publication Critical patent/GB821094A/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
    • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/19—Iron or steel

Landscapes

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

Abstract

Carbonaceous and iron oxide scale deposits are removed from heat-transfer surfaces in hydrocarbon-processing equipment by treatment with a composition comprising an hydrocarbon solvent and an aqueous solution at a pH in excess of 8 containing an alkanolamine and a polyamino-polycarboxylic acid, said alkanolamine and/or acid being in the form of an alkali metal salt. The hydrocarbon solvent may be kerosene, "Stoddard solvent," light fuel oil, benzene, toluene, or a light or medium naphtha; the alkanolamine may be triethanolamine, diethanolamine, tetraethanol ethylenediamine, N - (3 - chloro - 2 - hydroxypropyl) - diethanolamine, or tris-(hydroxymethyl) methylamine or the diethanol derivative thereof; and the polyaminopolycarboxylic acid may be ethylenediaminetetra-acetic acid, monoethanol ethylenediaminediacetic acid, or acids derived from trimethylene diamine and isopropylenediamine. The example relates to the cleaning of condenser tubes using a composition containing caustic soda, sodium hydrosulphite and a wetting agent in addition to the necessary ingredients.ALSO:Carbonaceous and iron oxide scale deposits are removed from heat transfer surfaces in hydrocarbon processing equipment by treatment with a water-immiscible hydrocarbon, solvent and an aqueous solution at a pH in excess of 8 containing an alkanolamine and a polyamino-polycarboxylic acid, said alkanolamine and/or acid being in the form of an alkali metal salt. The hydrocarbon solvent may be kerosene, "Stoddard solvent", light fuel oil, benzene, toluene, or a light or medium naphtha; the alkanolamine may be triethanolamine, diethanolamine, tetraethanol ethylenediamine, N-(3-chloro-2-hydroxypropyl)-diethanolamine, or tris (hydroxymethyl) methylamine or the diethanol derivative thereof; and the polyaminopolycarboxylic acid may be ethylenediaminetetraacetic acid, monoethanol ethylenediaminetriacetic acid, diethanol ethylenediaminediacetic acid, or acids derived from trimethylene diamine and isopropylenediamine. The example relates to the cleaning of condenser tubes using a composition containing caustic soda, sodium hydrosulphite and a wetting agent in addition to the necessary ingredients.
GB25068/55A 1954-09-14 1955-08-31 Improved method for descaling surfaces Expired GB821094A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US821094XA 1954-09-14 1954-09-14

Publications (1)

Publication Number Publication Date
GB821094A true GB821094A (en) 1959-09-30

Family

ID=22169110

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25068/55A Expired GB821094A (en) 1954-09-14 1955-08-31 Improved method for descaling surfaces

Country Status (1)

Country Link
GB (1) GB821094A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3368913A (en) * 1963-01-29 1968-02-13 Henkel & Cie Gmbh Process for the treatment of metal surfaces prior to enameling
US3754990A (en) * 1968-02-09 1973-08-28 Dow Chemical Co Cleaning of ferrous metal surfaces
USRE30796E (en) * 1962-07-23 1981-11-17 The Dow Chemical Co. Scale removal, ferrous metal passivation and compositions therefor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE30796E (en) * 1962-07-23 1981-11-17 The Dow Chemical Co. Scale removal, ferrous metal passivation and compositions therefor
US3368913A (en) * 1963-01-29 1968-02-13 Henkel & Cie Gmbh Process for the treatment of metal surfaces prior to enameling
US3754990A (en) * 1968-02-09 1973-08-28 Dow Chemical Co Cleaning of ferrous metal surfaces

Similar Documents

Publication Publication Date Title
US1787789A (en) A corpora
GB1042690A (en) Process for the pre-treatment of metal surfaces before enamelling
BR8105103A (en) PROCESS FOR PREPARING A COMPOUND AND PROCESS FOR DYING OR PRINTING SUBSTRATES
GB984329A (en) Improvements in or relating to compositions and processes for inhibiting the corrosion of ferrous metal surfaces
GB821094A (en) Improved method for descaling surfaces
GB990973A (en) Dyestuffs containing polyalkyleneamine groups
US3095380A (en) Composition for removal of heat scale and carbon deposits
NL178800C (en) METHOD AND EQUIPMENT FOR THE GALVANOPLASTIC MANUFACTURE OF IRON.
GB896159A (en) Improvements in or relating to descaling compositions
GB1023958A (en) Improvements in and relating to scale removal and ferrous metal passivation
GB823373A (en) Improvements relating to the formation of coatings on metal surfaces
GB1065016A (en) Metal surface treatment
GB730897A (en) Process of pickling metals
US1934076A (en) Carbon remover
SU536221A1 (en) Detergent for cleaning metal surfaces
CN110257179B (en) Chemical cleaning agent composition and preparation method and application thereof
GB1004957A (en) Photographic layers for the silver dyestuff bleaching process
ES332914A1 (en) Oxidation dyes comprising aromatic diamines and coupling components
GB823405A (en) Process for improving the wet fastness properties of direct dyeings
ATE58924T1 (en) PROCESS FOR DYING WOOL PIECE.
JPS55141576A (en) Detergent for steel material
GB578935A (en) Improvements in or relating to steam boiler plants and other heat exchange apparatus
DE3161978D1 (en) Ammonium salts of polymaleic acid and their application as corrosion inhibitors in mineral oils
GB518157A (en) Improvements in corrosion inhibitors for pickling baths
GB900998A (en) Method of finishing textile dyeings and prints