FR2093353A5 - In-service cleaning of cooling water systems - Google Patents

In-service cleaning of cooling water systems

Info

Publication number
FR2093353A5
FR2093353A5 FR7021456A FR7021456A FR2093353A5 FR 2093353 A5 FR2093353 A5 FR 2093353A5 FR 7021456 A FR7021456 A FR 7021456A FR 7021456 A FR7021456 A FR 7021456A FR 2093353 A5 FR2093353 A5 FR 2093353A5
Authority
FR
France
Prior art keywords
fe2o3
hardness
cooling water
water systems
cooling
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
FR7021456A
Other languages
French (fr)
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
Priority to FR7021456A priority Critical patent/FR2093353A5/en
Application granted granted Critical
Publication of FR2093353A5 publication Critical patent/FR2093353A5/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • 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

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

A cooling H2O system, having Fe2O3 and hardness deposited on the internal metal surfaces, is cleaned by a 2-stage method: an alkali metal or NH4 salt of an amino polycarboxylic acid is added to bring the pH to 7-12 and dissolve and complex the hardness deposits; after circulation, a mixture of the alkali metal or NH4 salt of an aminopolycarboxylic acid and an acidifying agent is added to dissolve and complex the Fe2O3 deposits and bring the pH to 3-6. After circulation, the cleaning soln. is displaced by make-up H2O. The process removes Fe2O3 and hardness from cooling H2O systems, such as an air-conditioning system.
FR7021456A 1970-06-11 1970-06-11 In-service cleaning of cooling water systems Expired FR2093353A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7021456A FR2093353A5 (en) 1970-06-11 1970-06-11 In-service cleaning of cooling water systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7021456A FR2093353A5 (en) 1970-06-11 1970-06-11 In-service cleaning of cooling water systems

Publications (1)

Publication Number Publication Date
FR2093353A5 true FR2093353A5 (en) 1972-01-28

Family

ID=9057027

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7021456A Expired FR2093353A5 (en) 1970-06-11 1970-06-11 In-service cleaning of cooling water systems

Country Status (1)

Country Link
FR (1) FR2093353A5 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2501357A1 (en) * 1981-03-04 1982-09-10 Permo Water treatment to de-foul heat exchanger - involves using additives to remove deposits, suspend particles, inhibit corrosion and/or improve filterability
WO1991004355A1 (en) * 1989-09-16 1991-04-04 Henkel Kommanditgesellschaft Auf Aktien Use of complexing agents to dissolve galactite
FR2833941A1 (en) * 2001-12-26 2003-06-27 Water Treat Internat Ltd A method of desludging radiator and under floor heating installations by introducing a composition containing a metal oxide sequestrant, allowing to circulate for a period, draining down and refilling

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2501357A1 (en) * 1981-03-04 1982-09-10 Permo Water treatment to de-foul heat exchanger - involves using additives to remove deposits, suspend particles, inhibit corrosion and/or improve filterability
WO1991004355A1 (en) * 1989-09-16 1991-04-04 Henkel Kommanditgesellschaft Auf Aktien Use of complexing agents to dissolve galactite
FR2833941A1 (en) * 2001-12-26 2003-06-27 Water Treat Internat Ltd A method of desludging radiator and under floor heating installations by introducing a composition containing a metal oxide sequestrant, allowing to circulate for a period, draining down and refilling

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Legal Events

Date Code Title Description
ST Notification of lapse