CN105417737A - Composite corrosion inhibitor used for soft water closed circulating water - Google Patents

Composite corrosion inhibitor used for soft water closed circulating water Download PDF

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Publication number
CN105417737A
CN105417737A CN201511008164.XA CN201511008164A CN105417737A CN 105417737 A CN105417737 A CN 105417737A CN 201511008164 A CN201511008164 A CN 201511008164A CN 105417737 A CN105417737 A CN 105417737A
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China
Prior art keywords
water
corrosion inhibitor
closed loop
composite corrosion
sodium
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Application number
CN201511008164.XA
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Chinese (zh)
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CN105417737B (en
Inventor
邱振华
王明祥
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.)
Zibo Huanuo Water Treatment Co Ltd
Shandong Inlen Chemical Technology Co Ltd
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Zibo Huanuo Water Treatment Co Ltd
Shandong Inlen Chemical Technology Co Ltd
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Application filed by Zibo Huanuo Water Treatment Co Ltd, Shandong Inlen Chemical Technology Co Ltd filed Critical Zibo Huanuo Water Treatment Co Ltd
Priority to CN201511008164.XA priority Critical patent/CN105417737B/en
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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
    • 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
    • C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
    • 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
    • C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
    • C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
    • C02F5/125—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen combined with inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/08—Corrosion inhibition

Abstract

The invention relates to a composite corrosion inhibitor used for soft water closed circulating water and belongs to the water treatment technology field. The composite corrosion inhibitor is prepared from the following raw materials, by weight, 5-15% of alkanolamide, 10%-25% of sodium molybdate, 20%-50% of sodium carbonate, 10%-30% of ascorbic acid, 8%-20% of hexamethylene tetramine, 5%-10% of azole derivatives and 5%-10% of sodium hydroxide. The composite corrosion inhibitor has good corrosion inhibition effects, contains no components harmful to the environment such as phosphor, heavy metals and the like, and is a green environment protection corrosion inhibitor.

Description

For the composite corrosion inhibitor of closed loop sofe water water
Technical field
The present invention relates to a kind of composite corrosion inhibitor for closed loop sofe water water, belong to water-treatment technology field.
Background technology
By the calcium in natural water, magnesium plasma remove after water be called softening water, softening water because of its hardness low, the feature of non-scaling, is widely used in the soft water closed circulating such as blast furnace, air-conditioning water system.
Containing Ca in natural water 2+, Mg 2+etc. hardness composition, can, protective layer of very thin not too fine and close at metallic surface formation of deposits one deck, reduce the contact of the corrosivess such as the oxygen in water with metal, because this reducing corrosion of metal.And softening water all eliminates the hardness in water, protective layer can not be formed again, while being not easy fouling, more easily cause the heavy corrosion of system.
Solution modal both at home and abroad adds inhibiter exactly at present, and the inhibiter such as nitrite, chromic salt because it is with low cost, excellent effect is widely applied, but exists serious problem of environmental pollution due to it, is subject to increasing restriction.And the inhibiter such as molybdate, tungstate when being used alone cost higher, other inhibiter are used alone also exists various problem.Therefore the developing direction that a kind of compound corrosion inhibitor that is efficient, environmentally friendly, low cost is current closed loop sofe water water treatment agent is developed.
Summary of the invention
The object of this invention is to provide a kind of composite corrosion inhibitor for closed loop sofe water water, its corrosion mitigating effect is good, and the environmentally harmful composition such as not phosphorous, heavy metal is a kind of environment-friendly corrosion inhibitor.
The described composite corrosion inhibitor for closed loop sofe water water, be made up of the raw material of following weight percentage: alkylolamide 5 ~ 15%, Sodium orthomolybdate 10% ~ 25%, sodium carbonate 20% ~ 50%, xitix 10% ~ 30%, hexamethylenetetramine 8% ~ 20%, azole derivative 5% ~ 10%, sodium hydroxide 5% ~ 10%.
Preferably, be made up of the raw material of following weight percentage: alkylolamide 8 ~ 12%, Sodium orthomolybdate 15% ~ 20%, sodium carbonate 25% ~ 40%, xitix 15% ~ 25%, hexamethylenetetramine 10% ~ 15%, benzotriazole 8% ~ 10%, sodium hydroxide 5% ~ 10%.
Described Sodium orthomolybdate is Sodium Molybdate Dihydrate.
Described azole derivative is one or more of benzotriazole, tolyltriazole or mercapto benzothiazole.
When using described without phosphorus composite slow-corrosion scale resistor, it adds concentration is 50 ~ 80mg/l.
Described without phosphorus composite slow-corrosion scale resistor is applicable to the closed loop sofe water water system that material is carbon steel, stainless steel or copper.
In formula of the present invention the character of related component and effect as follows:
Benzotriazole: be white or Bluish white needle crystal, covalent linkage and coordinate bond can be formed with copper atom, mutually replace into key-like polymer, multilayer proofing film is formed on copper surface, the surface of copper is made not produce electrochemical reaction, thus there is fabulous corrosion inhibition, there is good corrosion protection effect too to the metallic substance such as aluminium, steel.
Alkylolamide: white solid is nonionogenic tenside, can form one deck adsorption film, prevent metallic corrosion in metallic surface.
Sodium orthomolybdate: be white diamond xln.Sodium orthomolybdate belongs to anodic oxidation membranous type inhibiter, plays slow releasing function at anodic formation one deck ferrous iron-Gao Fe Mo complex oxide passive film, improves corrosion mitigating effect with benzotriazole etc. is composite.
Hexamethylenetetramine: molecular formula (CH 2) N 4, white, to light yellow crystalline powder, is polymer, can be adsorbed on metallic surface well, forms layer protecting film, suppresses corrosion of metal.
Compared with prior art, the present invention has following beneficial effect:
(1) system component has obvious synergistic function, can generate the mixed type protective layers such as oxide film, precipitation membrane, adsorption film;
(2) the environmentally harmful composition such as not phosphorous, heavy metal in formula, is a kind of environment-friendly corrosion inhibitor;
(3) this formula chemical feeding quantity is little, and cost is low, is applicable to various closed loop sofe water water system.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated, but it does not limit enforcement of the present invention.
Embodiment 1
The described composite corrosion inhibitor for closed loop sofe water water, be made up of the raw material of following weight percentage:
Alkylolamide 10%, Sodium orthomolybdate 16%, sodium carbonate 32%, xitix 18%, hexamethylenetetramine 14%, benzotriazole 5%, sodium hydroxide 5%.
Crystallizer soft water sealing and circulating water system like a chain of pearls or a string of beads, moisturizing is ion exchange resin softening water, adopts this to fill a prescription, and adding consistency is 50mg/l.Dosing runs 2 years, hangs with corrosion of carbon steel lacing film in circulating water system, within every two months, detects once, it is between 0.0085 ~ 0.027mma that period detects erosion rate, lacing film any surface finish, without spot corrosion, meets the requirement of GB50050-2007 Code for design of industrial recirculating cooling water treatment completely.
Embodiment 2
The described composite corrosion inhibitor for closed loop sofe water water, be made up of the raw material of following weight percentage:
Alkylolamide 8%, Sodium orthomolybdate 20%, sodium carbonate 30%, xitix 15%, hexamethylenetetramine 12%, tolyltriazole 8%, sodium hydroxide 7%.
1080m 3blast furnace adopts closed loop sofe water water system, and moisturizing is ion exchange resin softening water, adopts this to fill a prescription, and adding consistency is 65mg/l.Dosing runs 4 years, hangs with carbon steel lacing film in circulating water system, monthly detects an erosion rate all between 0.0042 ~ 0.015mma, lacing film any surface finish, without spot corrosion, system run all right, meets the requirement of GB50050-2007 Code for design of industrial recirculating cooling water treatment completely.
Embodiment 3
The described composite corrosion inhibitor for closed loop sofe water water, be made up of the raw material of following weight percentage:
Alkylolamide 5%, Sodium orthomolybdate 25%, sodium carbonate 20%, xitix 10%, hexamethylenetetramine 20%, mercapto benzothiazole 10%, sodium hydroxide 10%.
1080m 3blast furnace adopts closed loop sofe water water system, and moisturizing is reverse osmosis desalination water, adopts this to fill a prescription, and adding consistency is 70mg/l.Dosing runs 3 years, hangs with carbon steel lacing film in circulating water system, monthly detects an erosion rate all between 0.014 ~ 0.032mma, lacing film any surface finish, without spot corrosion, system run all right, meets the requirement of GB50050-2007 Code for design of industrial recirculating cooling water treatment completely.
Embodiment 4
The described composite corrosion inhibitor for closed loop sofe water water, be made up of the raw material of following weight percentage:
Alkylolamide 15%, Sodium orthomolybdate 10%, sodium carbonate 40%, xitix 17%, hexamethylenetetramine 8%, benzotriazole 2%, mercapto benzothiazole 3%, sodium hydroxide 5%.
Central air-conditioning adopts closed loop sofe water water system, and moisturizing is reverse osmosis desalination water, adopts this to fill a prescription, and adding consistency is 80mg/l.Dosing runs 2 years, hangs with carbon steel lacing film in circulating water system, monthly detects an erosion rate all between 0.009 ~ 0.030mma, lacing film any surface finish, without spot corrosion, system run all right, meets the requirement of GB50050-2007 Code for design of industrial recirculating cooling water treatment completely.

Claims (6)

1. the composite corrosion inhibitor for closed loop sofe water water, it is characterized in that being made up of the raw material of following weight percentage: alkylolamide 5 ~ 15%, Sodium orthomolybdate 10% ~ 25%, sodium carbonate 20% ~ 50%, xitix 10% ~ 30%, hexamethylenetetramine 8% ~ 20%, azole derivative 5% ~ 10%, sodium hydroxide 5% ~ 10%.
2. the composite corrosion inhibitor for closed loop sofe water water according to claim 1, it is characterized in that being made up of the raw material of following weight percentage: alkylolamide 8 ~ 12%, Sodium orthomolybdate 15% ~ 20%, sodium carbonate 25% ~ 40%, xitix 15% ~ 25%, hexamethylenetetramine 10% ~ 15%, benzotriazole 8% ~ 10%, sodium hydroxide 5% ~ 10%.
3. the composite corrosion inhibitor for closed loop sofe water water according to claim 1 and 2, is characterized in that: Sodium orthomolybdate is Sodium Molybdate Dihydrate.
4. the composite corrosion inhibitor for closed loop sofe water water according to claim 1 and 2, is characterized in that: azole derivative is one or more of benzotriazole, tolyltriazole or mercapto benzothiazole.
5. the composite corrosion inhibitor for closed loop sofe water water according to claim 1 and 2, is characterized in that: during without phosphorus composite slow-corrosion scale resistor described in use, it adds concentration is 50 ~ 80mg/l.
6. the composite corrosion inhibitor for closed loop sofe water water according to claim 1 and 2, is characterized in that: described without phosphorus composite slow-corrosion scale resistor is applicable to the closed loop sofe water water system that material is carbon steel, stainless steel or copper.
CN201511008164.XA 2015-12-29 2015-12-29 Composite corrosion inhibitor for closed loop sofe water water Active CN105417737B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107162225A (en) * 2017-05-23 2017-09-15 北京能泰高科环保技术股份有限公司 Corrosion inhibiter and methods and applications for closed soft water recirculating cooling water system
CN113716708A (en) * 2021-09-13 2021-11-30 大连理工大学 Descaling agent for inner wall of titanium tube of condenser

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Publication number Priority date Publication date Assignee Title
US7172699B1 (en) * 2004-10-13 2007-02-06 Eimco Water Technologies Llc Energy efficient wastewater treatment for nitrogen and phosphorus removal
CN101928075A (en) * 2010-08-30 2010-12-29 蓝星环境工程有限公司 Closed-type circulating cooling water system inhibiter and preparation method thereof
CN103130359A (en) * 2013-03-21 2013-06-05 柳州市盛鹏源环保科技有限公司 Corrosion and scale inhibition method for soft water closed circulation system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7172699B1 (en) * 2004-10-13 2007-02-06 Eimco Water Technologies Llc Energy efficient wastewater treatment for nitrogen and phosphorus removal
CN101928075A (en) * 2010-08-30 2010-12-29 蓝星环境工程有限公司 Closed-type circulating cooling water system inhibiter and preparation method thereof
CN103130359A (en) * 2013-03-21 2013-06-05 柳州市盛鹏源环保科技有限公司 Corrosion and scale inhibition method for soft water closed circulation system

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107162225A (en) * 2017-05-23 2017-09-15 北京能泰高科环保技术股份有限公司 Corrosion inhibiter and methods and applications for closed soft water recirculating cooling water system
CN107162225B (en) * 2017-05-23 2021-01-08 北京能泰高科环保技术股份有限公司 Corrosion inhibitor for closed soft water circulating cooling water system, method and application
CN113716708A (en) * 2021-09-13 2021-11-30 大连理工大学 Descaling agent for inner wall of titanium tube of condenser

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