CN111573858A - Corrosion inhibitor for treated coking phenol-cyanogen wastewater - Google Patents
Corrosion inhibitor for treated coking phenol-cyanogen wastewater Download PDFInfo
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- CN111573858A CN111573858A CN202010330390.4A CN202010330390A CN111573858A CN 111573858 A CN111573858 A CN 111573858A CN 202010330390 A CN202010330390 A CN 202010330390A CN 111573858 A CN111573858 A CN 111573858A
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- 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
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- 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
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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- 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
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- 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
- C02F2303/20—Prevention of biofouling
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- Environmental & Geological Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a corrosion inhibitor for coking phenol-cyanogen wastewater after treatment, which comprises the following raw materials in percentage by weight: 2-7% of zinc salt, 15-20% of dodecyl dimethyl benzyl ammonium chloride, 10-20% of polyaspartic acid, 5-15% of hydrolyzed polymaleic anhydride, 25-35% of molybdate, 5-10% of azole compound and 10-20% of water. The composite corrosion inhibitor can be used for water with high organic matter content, has good sterilization and algae removal effects while inhibiting corrosion, can prevent the growth of slime in water, and has a certain slime stripping effect; can be subjected to high temperatures of 1000 ℃ while still maintaining corrosion inhibition capability.
Description
Technical Field
The invention relates to the field of water treatment agents, in particular to a corrosion inhibitor for coking phenol-cyanogen wastewater after treatment.
Background
The coking phenol-cyanogen wastewater is from the processes of coking, gas purification and refining of chemical products, contains a large amount of toxic and harmful substances such as phenol, cyanogen, ammonia nitrogen, oil and the like, and has complex components and larger treatment difficulty. For the iron and steel combined enterprises, the coking wastewater is generally treated separately and then mixed with other wastewater to be discharged into a sewage treatment plant at the tail end of the enterprise, and then discharged after secondary treatment. Even if the coking wastewater is treated independently, the content of organic matters in the water, particularly macromolecular organic matters which are difficult to biodegrade, is still high, impact load is formed on a sewage treatment plant at the tail end, and pressure is caused on the final up-to-standard discharge of sewage of an iron and steel enterprise, so that how to realize the zero discharge of the coking wastewater is a problem to be solved urgently by the coking enterprise.
The treated coking wastewater is used as the water for dedusting and cooling the converter gas in certain large-scale steel and iron united enterprises in northwest of China. The method aims to decompose refractory high-molecular organic matters in the coking wastewater by using the high temperature of the converter gas, most of the decomposed organic matters exist in the converter gas in a gaseous state and are comprehensively utilized as energy, and the condensed coking wastewater can be recycled. On the basis, a corrosion inhibitor matched with the coking wastewater is needed to prevent the condensed coking wastewater from corroding the gas pipeline. The corrosion inhibitor is required to still maintain high corrosion prevention efficiency after the converter gas is subjected to high temperature.
Disclosure of Invention
The invention aims to provide a corrosion inhibitor for coking phenol-cyanogen wastewater after treatment.
In order to solve the technical problems, the invention adopts the following technical scheme:
a corrosion inhibitor for coking phenol-cyanogen wastewater after treatment comprises the following raw materials in percentage by weight: 2-7% of zinc salt, 15-20% of dodecyl dimethyl benzyl ammonium chloride, 10-20% of polyaspartic acid, 5-15% of hydrolyzed polymaleic anhydride, 25-35% of molybdate, 5-10% of azole compound and 10-20% of water.
Further, the zinc salt is one of zinc sulfate or zinc chloride.
Further, the molybdate is one of sodium molybdate or potassium molybdate.
Further, the azole compound is one of benzotriazole, methylbenzotriazole and mercaptobenzothiazole.
Further, the material comprises the following raw materials in percentage by weight: 2% of zinc salt, 20% of dodecyl dimethyl benzyl ammonium chloride, 10% of polyaspartic acid, 5% of hydrolyzed polymaleic anhydride, 35% of molybdate, 10% of benzotriazole and 18% of water.
Further, the material comprises the following raw materials in percentage by weight: 7% of zinc salt, 15% of dodecyl dimethyl benzyl ammonium chloride, 20% of polyaspartic acid, 5% of hydrolyzed polymaleic anhydride, 25% of molybdate, 10% of methyl benzotriazole and 18% of water.
Further, the material comprises the following raw materials in percentage by weight: 7% of zinc salt, 20% of dodecyl dimethyl benzyl ammonium chloride, 15% of polyaspartic acid, 5% of hydrolyzed polymaleic anhydride, 25% of molybdate, 15% of mercaptobenzothiazole and 13% of water.
Compared with the prior art, the invention has the beneficial technical effects that:
the composite corrosion inhibitor can be used in coking wastewater, can be used in water with high organic matter content, has good sterilization and algae removal effects while inhibiting corrosion, can prevent the growth of slime in water, and has a certain slime stripping effect; can be subjected to high temperatures of 1000 ℃ while still maintaining corrosion inhibition capability.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a schematic diagram showing the pickling result of the surface of a copper coupon;
FIG. 2 is a schematic diagram showing the pickling result of the surface of the stainless steel coupon;
FIG. 3 is a schematic diagram showing the pickling result of the surface of the carbon steel coupon.
Detailed Description
Example 1
A corrosion inhibitor for coking phenol-cyanogen wastewater after treatment comprises the following raw materials in percentage by weight: 2% of zinc sulfate, 20% of dodecyl dimethyl benzyl ammonium chloride, 10% of polyaspartic acid, 5% of hydrolyzed polymaleic anhydride, 35% of sodium molybdate, 10% of benzotriazole and 18% of water.
The preparation method comprises the following steps: heating water to 50 deg.C, sequentially adding the above materials into water, and naturally cooling to room temperature after 15 min.
The corrosion inhibitor is added into the treated coking wastewater to cool and cool converter gas, the adding amount is 80mg/L, the media in the pipeline are the converter gas and saturated steam, condensed water is arranged at the bottom of the pipeline, the temperature in the recovery period is 50-65 ℃, the non-recovery period is 30-40 ℃, and the recovery period is about eight hours per day.
The types of hanging pieces are as follows: plain carbon steel, stainless steel, brass standard lacing film.
Time: year 2019, month 5, day 28, 15: 00-2019, 9, 24, 15: 00 Total 119d
(2) Results and analysis
As shown in fig. 1 to 3, a dense scale layer is formed on the surface of each of the copper, stainless steel and carbon steel coupons, and the surface scale cannot be removed by pickling in a hydrochloric acid or sulfuric acid solution, and it is found that the surface scale of the coupon is not an oxide generated by metal corrosion, and it is assumed that dust adheres to the converter gas in consideration of the environment in which the coupon is located.
Because the surface dirt can not be removed by acid washing, the surface dirt can be removed by adopting the hairbrush and the cutter, the surface dirt of copper and stainless steel can be removed by the hairbrush, the cutter and other tools, the surface dirt of carbon steel can not be removed, and the surface dirt of carbon steel is firmly combined with the base material. The carbon steel after removing the surface dirt is cleaned by 10% hydrochloric acid and 0.5% hexamethylenetetramine for 15min, the copper is cleaned by 15% hydrochloric acid for 3-5min, and the stainless steel is cleaned by 10% nitric acid for 10-20 min. And immersing the cleaned hanging piece into a sodium hydroxide solution for passivation, taking out the hanging piece, putting the hanging piece into absolute ethyl alcohol, and wiping the hanging piece with filter paper.
The surfaces of copper and stainless steel are smooth after acid washing, and the pitting corrosion of carbon steel after acid washing is serious, belonging to under-deposit corrosion.
Weight change of hanging piece
Referring to the requirement of GB50050-2007 of design Specification for treating industrial circulating cooling water, the corrosion rate to carbon steel is less than 0.075mm/a, the corrosion rate to copper pipe is less than 0.005mm/a, the corrosion rate to stainless steel pipe wall is less than 0.005mm/a, the corrosion rate of each material is lower than the requirement, and the corrosion inhibitor has good effect.
Example 2
A corrosion inhibitor for coking phenol-cyanogen wastewater after treatment comprises the following raw materials in percentage by weight: 7% of zinc chloride, 15% of dodecyl dimethyl benzyl ammonium chloride, 20% of polyaspartic acid, 5% of hydrolyzed polymaleic anhydride, 25% of potassium molybdate, 10% of methyl benzotriazole and 18% of water.
Heating water to 50 deg.C, sequentially adding the above materials into water, and naturally cooling to room temperature after 15 min.
Taking effluent of a secondary sedimentation tank of a coking plant of a certain iron and steel integrated enterprise in northwest as experimental water, adding the corrosion inhibitor of the embodiment 2 of the invention, and utilizing the method for measuring the corrosion inhibition performance of a water treatment agent to measure the corrosion inhibition performance of the agent GB/T18175-2014, wherein the adding amount of the corrosion inhibitor is 80mg/L, and according to the test results, the corrosion rates of the corrosion inhibitor on copper, stainless steel and carbon steel are respectively 3.57 × 10-4mm/a、4.18×10-4mm/a、3.09×10-3mm/a, meets the requirements of industrial circulating cooling water treatment design specification GB 50050-2007.
Example 3
A corrosion inhibitor for coking phenol-cyanogen wastewater after treatment comprises the following raw materials in percentage by weight: 7% of zinc chloride, 20% of dodecyl dimethyl benzyl ammonium chloride, 15% of polyaspartic acid, 5% of hydrolyzed polymaleic anhydride, 25% of potassium molybdate, 15% of mercaptobenzothiazole and 13% of water.
Heating water to 50 deg.C, sequentially adding the above materials into water, and naturally cooling to room temperature after 15 min.
Taking effluent of a secondary sedimentation tank of a coking plant of a certain iron and steel integrated enterprise in northwest as experimental water, adding the corrosion inhibitor of the embodiment 3 of the invention, and utilizing the method for measuring the corrosion inhibition performance of a water treatment agent to measure the corrosion inhibition performance of the agent GB/T18175-2014, wherein the adding amount of the corrosion inhibitor is 80mg/L, and according to the test results, the corrosion rates of the corrosion inhibitor on copper, stainless steel and carbon steel are respectively 3.42 × 10-4mm/a、5.48×10-4mm/a、2.99×10-3mm/a, meets the requirements of industrial circulating cooling water treatment design specification GB 50050-2007.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (7)
1. A corrosion inhibitor for coking phenol-cyanogen wastewater after treatment is characterized in that: comprises the following raw materials in percentage by weight: 2-7% of zinc salt, 15-20% of dodecyl dimethyl benzyl ammonium chloride, 10-20% of polyaspartic acid, 5-15% of hydrolyzed polymaleic anhydride, 25-35% of molybdate, 5-10% of azole compound and 10-20% of water.
2. The corrosion inhibitor for the treated coking phenol-cyanogen wastewater according to claim 1, which is characterized in that: the zinc salt is one of zinc sulfate or zinc chloride.
3. The corrosion inhibitor for the treated coking phenol-cyanogen wastewater according to claim 1, which is characterized in that: the molybdate is one of sodium molybdate or potassium molybdate.
4. The corrosion inhibitor for the treated coking phenol-cyanogen wastewater according to claim 1, which is characterized in that: the azole compound is one of benzotriazole, methylbenzotriazole and mercaptobenzothiazole.
5. The corrosion inhibitor for the treated coking phenol-cyanogen wastewater according to claim 1, which is characterized in that: comprises the following raw materials in percentage by weight: 2% of zinc salt, 20% of dodecyl dimethyl benzyl ammonium chloride, 10% of polyaspartic acid, 5% of hydrolyzed polymaleic anhydride, 35% of molybdate, 10% of benzotriazole and 18% of water.
6. The corrosion inhibitor for the treated coking phenol-cyanogen wastewater according to claim 1, which is characterized in that: comprises the following raw materials in percentage by weight: 7% of zinc salt, 15% of dodecyl dimethyl benzyl ammonium chloride, 20% of polyaspartic acid, 5% of hydrolyzed polymaleic anhydride, 25% of molybdate, 10% of methyl benzotriazole and 18% of water.
7. The corrosion inhibitor for the treated coking phenol-cyanogen wastewater according to claim 1, which is characterized in that: comprises the following raw materials in percentage by weight: 7% of zinc salt, 20% of dodecyl dimethyl benzyl ammonium chloride, 15% of polyaspartic acid, 5% of hydrolyzed polymaleic anhydride, 25% of molybdate, 15% of mercaptobenzothiazole and 13% of water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010330390.4A CN111573858A (en) | 2020-04-24 | 2020-04-24 | Corrosion inhibitor for treated coking phenol-cyanogen wastewater |
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| CN202010330390.4A CN111573858A (en) | 2020-04-24 | 2020-04-24 | Corrosion inhibitor for treated coking phenol-cyanogen wastewater |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102452721A (en) * | 2010-10-20 | 2012-05-16 | 中国石油化工股份有限公司 | Phosphorus-free composite scale-inhibiting corrosion-retarding agent and application thereof in water treatment |
| CN103319011A (en) * | 2013-07-15 | 2013-09-25 | 北京市龙源科创石油技术有限公司 | Low-phosphorous environment-friendly composite scale and corrosion inhibitor |
| CN104261575A (en) * | 2014-10-16 | 2015-01-07 | 山东天庆科技发展有限公司 | High-COD special non-phosphorus corrosion and scale inhibitor and preparation method thereof |
| WO2015101124A1 (en) * | 2014-01-03 | 2015-07-09 | 广州特种承压设备检测研究院 | Phosphorous-free corrosion and scale inhibitor used in circulating cooling water of central air conditioning, and method of preparing said inhibitor |
| CN108751449A (en) * | 2018-06-21 | 2018-11-06 | 刘寒 | A kind of non-phosphorus scale and corrosion inhibitor and preparation method thereof |
-
2020
- 2020-04-24 CN CN202010330390.4A patent/CN111573858A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102452721A (en) * | 2010-10-20 | 2012-05-16 | 中国石油化工股份有限公司 | Phosphorus-free composite scale-inhibiting corrosion-retarding agent and application thereof in water treatment |
| CN103319011A (en) * | 2013-07-15 | 2013-09-25 | 北京市龙源科创石油技术有限公司 | Low-phosphorous environment-friendly composite scale and corrosion inhibitor |
| WO2015101124A1 (en) * | 2014-01-03 | 2015-07-09 | 广州特种承压设备检测研究院 | Phosphorous-free corrosion and scale inhibitor used in circulating cooling water of central air conditioning, and method of preparing said inhibitor |
| CN104261575A (en) * | 2014-10-16 | 2015-01-07 | 山东天庆科技发展有限公司 | High-COD special non-phosphorus corrosion and scale inhibitor and preparation method thereof |
| CN108751449A (en) * | 2018-06-21 | 2018-11-06 | 刘寒 | A kind of non-phosphorus scale and corrosion inhibitor and preparation method thereof |
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Application publication date: 20200825 |
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