GB2139206A - Preventing corrosion - Google Patents

Preventing corrosion Download PDF

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Publication number
GB2139206A
GB2139206A GB8311060A GB8311060A GB2139206A GB 2139206 A GB2139206 A GB 2139206A GB 8311060 A GB8311060 A GB 8311060A GB 8311060 A GB8311060 A GB 8311060A GB 2139206 A GB2139206 A GB 2139206A
Authority
GB
United Kingdom
Prior art keywords
nitrophenol
hydrazine
water
relation
amino
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.)
Granted
Application number
GB8311060A
Other versions
GB2139206B (en
GB8311060D0 (en
Inventor
Dr Wilfried Fuchs
Dr Horst Richter
Dr Roland Kober
Vendelin Kaufmann
Christina Muller
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.)
Leuna Werke GmbH
Original Assignee
Leuna Werke GmbH
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 Leuna Werke GmbH filed Critical Leuna Werke GmbH
Priority to GB8311060A priority Critical patent/GB2139206B/en
Publication of GB8311060D0 publication Critical patent/GB8311060D0/en
Publication of GB2139206A publication Critical patent/GB2139206A/en
Application granted granted Critical
Publication of GB2139206B publication Critical patent/GB2139206B/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • 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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • 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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
    • C23F11/14—Nitrogen-containing compounds
    • C23F11/141—Amines; Quaternary ammonium compounds
    • C23F11/142—Hydroxy amines

Abstract

A hydrazine solution with improved initial activity in relation to oxygen dissolved in water which has been activated by the addition of complexes of trivalent cobalt with inorganic ligands as complex-formers, contains 2-amino-4-nitrophenol and or 2-acetamino-4-nitrophenol as a coactivator.

Description

SPECIFICATION Process for improving the initial activity of activated hydrazine This invention relates to a process for improving the initial activity of hydrazine in relation to oxygen dissolved in water, the hydrazine being activated by the addition of complexes of trivalent cobalt with inorganic ligangs as complex-formers.
Activated hydrazine is used as a means for the removal of oxygen from water, particularly from boiler feed water and from water employed for preservation of idle plant, in order to prevent corrosion of tanks, pipes,heat exchangers and other parts.
For the removal of oxygen dissolved in water various processes are employed. Preference is given to the use of hydrazine, which even at low temperatures and with the addition of suitable activators; reacts with oxygen dissolved in water to form hydrogen. Cationic and anionic complexes of trivalent cobalt, with inorganic ligands as complex-formers, are proposed as particularly suitable activators (GB ref:39291). Even if these activators are regarded as advantageous, they have a disadvantage in that hydrazine activated in this way does not immediately reach its full reaction speed in relation to oxygen dissolved in water. The drawback may be surmounted either by gasification with air or by the addition of trivalent phenols as coactivators (GB ref:39274).These measures can improve the initial activity provided a relatively high concentration of activator is maintained, amounting to 0.5 to 1 g per litre of commercial hydrazine solution.
For special applications, however, these activator concentrations, though satisfactorily effective in themselves, may prove excessive in relation to the oxygen decomposition.
This invention seeks to improve the initial activity of activated hydrazine in relation to oxygen dissolved in water and at the same time to reduce the activator concentration required when the activators employed consist of complexes of the trivalent cobalt with inorganic ligands as complex-formers. The object of the invention is to provide a suitable activator system which ensures that hydrazine solution with the said activators in moderate concentration would immediately reach a high reaction speed in relation to oxygen dissolved in water, this process not requiring gasification with air.
According to this invention there is provided a process for improving the initial activity in relation to oxygen dissolved in water of hydrazine which has been activated by the addition of complexes of trivalent cobalt with inorganic ligands as complex-formers, in which process the activated hydrazine solution contains 2-amino-4-nitrophenol and/or 2-acetamino-4-nitrophenol as a coactivator.
Despite the fact that aminophenols with at least two nitro groups in the molecules are already known as activators, although they have to be used in comparatively high concentrations (DE 2601466), it has been found that neither 2-amino-4-nìtriphenol nor a pure acetyl compound is satisfactorily effective when used as an activator.
Surprisingly it has been found that aqueous hydrazine solutions when produced in a suitable manner and containing the activators in the form of cationic or anionic complexes of trivalent cobalt with inorganic ligands as complex-formers and at the same time containing small quantities of 2-acetamino-4-nitrnphenol or 2-amino-4-nitrophenol as coactivators, develop from the beginning of their action a fully adequate speed for the decomposition of oxygen dissolved in water. This enables the activator content to be reduced to below the value of 0.05 to 0.1% by mass in relation to the aqueous hydrazine solution, which is the usual proportion in this group of substances, with 220 g N2H4/l.
High reaction speeds in relation to oxygen are obtained with hydrazine solutions containing, 0.05 to 0.5g/l of cobalt complex as an activator and 0.05 to 0.25 g/l of 2-amino-4-nitrophenol or 2-acetamino-4-nitrophenol as a coactivator. With a view to maximum use of metal complex compound, hydrazine solutions containing 0.05 to 0.5 gll of sodium hexanitritocobaltate (III) and 0.05 to 0.25 g/l of 2-acetamino-4-nitrophenol mixed with 2-amino-4-nitrophenol are particularly suitable.
Example 1 1 ml of an aqueous hydrazine solution containing 220 g of hydrazine per litre, and with an activator consisting of 0.05 to 0.5 g/l of sodium hexanitritocobaltate (III) or cobalt (Ill)-hexamminochloride and a coactivator consisting of 0.05 to 0.25 g/l of 2-amino-4-nitrophenol or 2-acetamino-4-nitrophenol or a mixture of both compounds, is added to one litre of oxygenous water with about 6.5 mg 02/1, of which the pH value has been set to 10.4, the oxygen decomposition then being measured after 10 minutes.The temperature amounts to 293 K. The following table shows, after a reaction time of 10 minutes, the oxygen decomposition as a percentage in relation to the concentration of activator and of coactivator, compared with values obtained in the presence of only one substance in each case in addition to hydrazine.
Na3Co(NO2)5 Co(N H3)5Cl3 2-Acetamino- 2-Amino- 02-Decomposition 4-nitrophenol 4-nitrophenol after 10 minutes (g/l) (g/l) (g/l) (g/l) (%) - - 1 - 13 - - 0.5 - 9 - - 0.25 - 3 - - -2 - 12 0.05 - 0.05 88 0.1 - 0.1 - 96 0.25 - 0.25 - 97 0.5 - 0.25 - 98 0.1 - - 0.1 89 0.25 - - 0.25 100 0.05 - 0.05 0.05 86 0.1 - 0.05 0.05 99 - 0.25 - 0.25 100 - 0.25 0.25 - 100 i 0.1 0.05 0.05 89 - 0.05 0.05 0.05 78 1.6 70 1.5 - - - 62

Claims (3)

1. Process for improving the initial activity, in relation to oxygen dissolved in water, of hydrazine which has been activated by the addition of complexes of trivalent cobalt with inorganic ligands as complexformers, in which process the activated hydrazine solution contains 2-amino-4-nitrophenol and/or 2-acetamino-4-nitrophenol as a coactivator.
2. Process in accordance with Claim 1, wherein the hydrazine solution contains 0.05 to 0.5 g/l cobalt complex as an activator and a mixture of 0.05 to 0.25 g/12-amino-4-nitrophenol and 2-acetamino-4nitrophenol as a coactivator.
3. Process for improving the initial activity of hydrazine in relation to oxygen dissolved in water as described herein and exemplified.
GB8311060A 1983-04-22 1983-04-22 Preventing corrosion Expired GB2139206B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8311060A GB2139206B (en) 1983-04-22 1983-04-22 Preventing corrosion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8311060A GB2139206B (en) 1983-04-22 1983-04-22 Preventing corrosion

Publications (3)

Publication Number Publication Date
GB8311060D0 GB8311060D0 (en) 1983-05-25
GB2139206A true GB2139206A (en) 1984-11-07
GB2139206B GB2139206B (en) 1986-10-29

Family

ID=10541560

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8311060A Expired GB2139206B (en) 1983-04-22 1983-04-22 Preventing corrosion

Country Status (1)

Country Link
GB (1) GB2139206B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2196991B (en) * 1985-05-28 1990-03-28 Kurita Water Ind Ltd Method for removal of patina
US7235142B2 (en) 2002-01-04 2007-06-26 University Of Dayton Non-toxic corrosion-protection rinses and seals based on cobalt
US7291217B2 (en) 2002-01-04 2007-11-06 University Of Dayton Non-toxic corrosion-protection pigments based on rare earth elements
US7294211B2 (en) 2002-01-04 2007-11-13 University Of Dayton Non-toxic corrosion-protection conversion coats based on cobalt
US7789958B2 (en) 2003-01-13 2010-09-07 University Of Dayton Non-toxic corrosion-protection pigments based on manganese

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2196991B (en) * 1985-05-28 1990-03-28 Kurita Water Ind Ltd Method for removal of patina
US7235142B2 (en) 2002-01-04 2007-06-26 University Of Dayton Non-toxic corrosion-protection rinses and seals based on cobalt
US7291217B2 (en) 2002-01-04 2007-11-06 University Of Dayton Non-toxic corrosion-protection pigments based on rare earth elements
US7294211B2 (en) 2002-01-04 2007-11-13 University Of Dayton Non-toxic corrosion-protection conversion coats based on cobalt
US7407711B2 (en) 2002-01-04 2008-08-05 University Of Dayton Non-toxic corrosion-protection conversion coats based on rare earth elements
US7422793B2 (en) 2002-01-04 2008-09-09 University Of Dayton Non-toxic corrosion-protection rinses and seals based on rare earth elements
US7833331B2 (en) 2002-01-04 2010-11-16 University Of Dayton Non-toxic corrosion-protection pigments based on cobalt
US7789958B2 (en) 2003-01-13 2010-09-07 University Of Dayton Non-toxic corrosion-protection pigments based on manganese

Also Published As

Publication number Publication date
GB2139206B (en) 1986-10-29
GB8311060D0 (en) 1983-05-25

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