CN115140849B - Linear release type long-acting phosphorus-free scale inhibitor - Google Patents
Linear release type long-acting phosphorus-free scale inhibitor Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
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Abstract
The invention provides a linear release type solid scale inhibitor, which has the characteristics of long-acting, stability, environmental friendliness and the like. The scale inhibitor takes a silicon dioxide framework as a carrier, can continuously and stably release an active ingredient namely polyboroxygen anions in a plurality of months, can combine calcium ions and magnesium ions to form amorphous flocs under certain environmental conditions, and is discharged through solid-liquid separation, so that the scale inhibitor can realize the increase of the concentration multiple of water without the increase of the concentration of the calcium ions and the magnesium ions in water. The scale inhibitor is a solid inorganic phosphorus-free scale inhibitor, can keep the active ingredients in water at constant concentration by controlling the release rate, can continuously combine calcium and magnesium ions for a long time, does not cause water quality deterioration, and has no eutrophication risk in drainage.
Description
Technical Field
The invention belongs to the field of water treatment medicaments, and relates to preparation and application of a linear release type inorganic phosphorus-free scale inhibitor.
Background
Increasing the concentration factor is an effective method for reducing the consumption of circulating water, but the concentration of calcium, magnesium and other ions in the water is increased, so that serious scaling problems are caused. Scale has a thermal resistance of about 40-50 times that of carbon steel and can clog pipes, threatening production safety. In order to effectively control the formation of these inorganic precipitants, scale inhibitors of the type of considerable polyphosphates, phosphonates and polycarboxylates have emerged.
US 09108866 and CN 102674571 disclose a series of scale inhibitors based on a threshold amount of amino acid alkyl phosphonic acid, providing an effective scale control method using essentially a single active scale inhibitor. CN 109126474 describes a composite phosphorus-free scale inhibitor consisting of dendrimers, sodium polyepoxysuccinate, sodium polyaspartate, iA-Amp ps and water. CN 101700937 discloses a compound scale inhibitor suitable for high-hardness high-alkali industrial circulating water, which consists of HEDP, polyaspartic acid, polymaleic anhydride, polyacrylic acid dispersant and the like. The corrosion and scale inhibitor composition described in CN 110066033 contains copolymer of maleic anhydride and allyloxy polyoxyethylene maleic acid monoester, organic phosphine compound, non-phosphorus organic acid and/or non-phosphorus organic acid salt, water soluble inorganic zinc salt, etc.
The mechanism of action of the phosphate/phosphonate is a threshold effect, preventing/inhibiting/retarding the formation of scale-like crystallites. The polycarboxylate works in such a way that it is a lattice distortion and dispersion effect that prevents further growth of scale crystallites by adsorbing to the crystal surface of the scale and inhibiting deposition and adhesion of the scale on solid surfaces such as pipes and vessels. These forms can achieve effective scale inhibition at a certain concentration factor, necessarily accompanied by a large water make-up and drainage. If the concentration multiple is continuously increased, the concentration of calcium and magnesium ions is inevitably increased, and the continuous concentration eventually exceeds the scale inhibition capability range.
In order to realize the continuous scale inhibition effect, the traditional liquid or instant scale inhibitor needs to be periodically added, and the concentration of the effective scale inhibitor component in the circulating water system is periodically changed. The scale inhibitor has the risk of scaling under the condition of low concentration of the scale inhibitor, and has no long-acting property. The addition of the organic phosphorus scale inhibitor of the type enables the water body to be suitable for microorganism growth, and biological slime is easy to form, so that the thermal resistance of the scale and the corrosion of microorganisms are generated, and the eutrophication problem can be caused when concentrated water is discharged into the natural water body. The development of an inorganic solid slow-release scale inhibitor is a solution, but how to enable the release rate to have controllability and stability is a difficult problem to be broken through.
Disclosure of Invention
Based on the background, the invention prepares the linear release type long-acting phosphorus-free scale inhibitor. In the present invention, silica and other raw materials are calcined and molded in one step by a melt-calcining method. An inorganic solid slow-release material of the polyborate supported by the silicon dioxide framework is formed. The silica framework is utilized in combination with polyborates to achieve linear release over short and long term ranges, so that the total boron concentration contained in the water replenishment system can be controlled and near zero order kinetic release characteristics are exhibited over a 30 day period. When the polyborate reaches a certain concentration in the circulating water system, polyboroxygen anions are formed, and the flexible flocs are formed by combining calcium ions and magnesium ions. Finally, the sediment is discharged through solid-liquid separation, so that the concentration of calcium and magnesium ions in a circulating water system is always kept at a lower level, and the concentration of calcium and magnesium ions is not increased along with the increase of the concentration multiple.
The first aspect of the present invention is to deliver boron oxygen dosing anions using a one-step shaped silica framework to achieve linear release of active ingredient, maintaining the active ingredient concentration in the circulating water system at a constant value.
The second aspect of the invention is to use inorganic, phosphorus-free boron oxygen anions to realize bottom-up self-assembly by sharing calcium and magnesium ion peaks, form flexible fiber (network, flocculent) amorphous substances, discharge the substances in a precipitation mode and prevent crystals such as carbonate and the like from forming.
The third aspect of the invention provides a preparation method of a linear release type long-acting phosphorus-free scale inhibitor, which comprises the following steps:
step 1: weighing SiO 2 Powder, H 3 BO 3 、NaB 4 O 7 ·10H 2 O、NaHCO 3 Grinding, mixing, sieving to remove large-particle SiO 2 And dried in an oven to remove free moisture.
Wherein SiO is 2 The mass of (2) is 7.40-22.20g; h 3 BO 3 Is 15.08-47.31g; na (Na)B 4 O 7 ·10H 2 The mass of O is 15.01-48.03g; naHCO (NaHCO) 3 The mass of (3.00-9.00 g).
Step 2: and (3) raising the temperature of the muffle furnace to 500-1200 ℃, rapidly placing the raw materials into the muffle furnace, preserving heat for 0.5-2.5h, and simultaneously preheating the die.
Step 3: and immediately taking out the molten product, and naturally cooling and molding the molten product by reverse mold.
A fourth aspect of the invention is to provide the use of the material in the linear release of active ingredients and scale inhibition.
Wherein the liquid in the release rate measurement experiment is pure water, and the water temperature is more than or equal to 30 ℃; the liquid environment in the scale inhibition performance test contains calcium ion concentration more than 0mg/L and less than or equal to 500mg/L, and magnesium ion concentration more than 0mg/L and less than or equal to 500mg/L.
The invention has the following beneficial effects:
the scale inhibitor of the invention utilizes a silica framework to deliver boron oxygen anions to achieve linear release of active ingredients. The active ingredient can be released with near zero order dynamics characteristic in a period of several months, and the concentration of the active ingredient in the circulating water system is kept at a constant value. When the boron-oxygen anion reaches a certain concentration in the circulating water system, the self-assembly of the boron-oxygen anion in the circulating water system from bottom to top is realized by sharing the peaks of calcium and magnesium ions, so that flexible fiber (network, flocculent) objects are formed, and the adhesion, nucleation and growth of carbonate scale crystals on the surface of a pipeline are inhibited. Finally, through solid-liquid separation, the concentration of calcium ions in a circulating water system is always kept at a lower level and is not increased along with the increase of the concentration multiple, so that the high-efficiency scale inhibition under the long-term high concentration multiple is realized.
Drawings
FIG. 1 shows the appearance of a linear release inorganic phosphorus-free scale inhibitor according to the present invention;
FIG. 2 shows a 60-fold microphotograph of amorphous flocs produced with calcium and magnesium ions in combination with boron oxide anions according to the present invention;
FIG. 3 shows the linear release profile of scale inhibitor 3 in example 3;
FIG. 4 shows the performance curves of scale inhibitor 1 of example 1 for the removal of calcium and magnesium ions;
FIG. 5 shows the product composition structure of the scale inhibitor 1 of example 1 acting on calcium and magnesium ions.
Detailed Description
The following is a detailed description of some exemplary embodiments, materials and applications described herein, for the purpose of clarity and understanding to those skilled in the art. The following examples and descriptions are not intended to limit the invention, and in the context of the present invention, various environmental scenarios, various modifications, or other equivalent alternatives may be implemented, which are all within the scope of the present invention. The scope of the invention is defined by the appended claims.
Example 1
The preparation method of the scale inhibitor 1 comprises the following steps:
weighing SiO 2 7.4g of powder, H 3 BO 3 15.1g of powder, naB 4 O 7 ·10H 2 O powder 15.0g, naHCO 3 3.0g of powder, grinding, fully and uniformly mixing, sieving and removing large-particle SiO 2 And dried in a vacuum oven at 80℃for 2 hours to remove free moisture. And (5) raising the temperature of the muffle furnace to 1050 ℃, and rapidly placing the raw materials into the muffle furnace for heat preservation for 1.5h. The graphite mold was preheated to 120 ℃, the molten product was immediately withdrawn and poured into the mold, and the vertical ram was capped to prevent quench cracking of the product. And then naturally cooling and molding.
Linear release monitoring:
the scale inhibitor 1 with a certain volume and regular shape is placed in pure water, the dosage of the scale inhibitor is 800mg/L, the scale inhibitor is placed in a constant temperature oscillator at 30 ℃ after being sealed, and the total boron concentration in the water is monitored periodically by using an inductively coupled plasma mass spectrometer.
And (3) scale inhibition performance monitoring:
the scale inhibitor 1 with a certain volume and regular shape is placed in a solution containing 300mg/L calcium ions and 300mg/L magnesium ions, and the dosage of the scale inhibitor is 5000mg/L. And (3) placing the solution in a constant-temperature oscillator at 30 ℃ for 5.5 days for linear release and scale inhibition experiments, concentrating the solution by 2 times, 4 times and 6 times, periodically taking water, filtering, monitoring the concentration of calcium ions and magnesium ions in the water by using an inductively coupled plasma mass spectrometer, and monitoring the composition of a precipitated product by using an X-ray photoelectron spectroscopy.
Test results:
1. the linear release monitoring results are as follows:
TABLE 1 Total boron concentration in solution as a function of Release time
The results show that: the linear relationship between total boron concentration (y) over 30 days versus release time (x) is y=6.1906x+62.881, correlation coefficient r2=0.774. A rapid linear release phase within 5.5d of the initial release, a release rate of about 23.51mg L -1 d -1 A slow linear release period in the range of 5.5-30 days, a release rate of about 3.59mg L -1 d -1 。
2. The scale inhibition performance monitoring results are as follows:
TABLE 1-2 time dependence of calcium and magnesium ion concentration in the environment described in example 1
TABLE 1-3 calcium and magnesium ion concentration as a function of concentration factor under the conditions described in example 1
The result shows that the concentration of the calcium ions is gradually reduced and is stable within the concentration range of 49-59 mg/L; the concentration of magnesium ions is gradually reduced and is stabilized in the concentration range of 145-155 mg/L. The scale inhibitor 1 can continuously remove calcium and magnesium ions, so that the concentration of the scale inhibitor is not increased along with the increase of the concentration multiple.
Example 2
The preparation method of the scale inhibitor 2 comprises the following steps:
weighing SiO 2 14.8g of powder, H 3 BO 3 15.1g of powder, naB 4 O 7 ·10H 2 33.0g of O powder and NaHCO 3 6.0g of powder and the rest of the procedure is as in example 1.
Linear release monitoring:
the monitoring method was the same as in example 1.
And (3) scale inhibition performance monitoring:
the monitoring method was the same as in example 1.
Test results:
1. the linear release monitoring results are as follows:
TABLE 2-1 Total boron concentration in solution as a function of Release time under the circumstances described in example 2
The results show that: the linear relationship between total boron concentration (y) over 30 days relative to release time (x) is y=7.9306x+30.41, correlation coefficient R 2 =0.950. Almost linear release over a 30 day period, at a release rate of about 8.01mg L -1 d -1 。
2. The scale inhibition performance monitoring results are as follows:
TABLE 2-2 time dependence of calcium and magnesium ion concentrations in the environment described in example 2
TABLE 2-3 calcium and magnesium ion concentration as a function of concentration factor under the conditions described in example 2
The result shows that the concentration of the calcium ions is gradually reduced and is stable within the concentration range of 118-125 mg/L; the concentration of magnesium ions is gradually reduced and is stabilized in the concentration range of 114-119 mg/L. The scale inhibitor 2 can continuously remove calcium and magnesium ions, so that the concentration of the scale inhibitor is not increased along with the increase of the concentration multiple.
Example 3
The preparation method of the scale inhibitor 3 comprises the following steps:
weighing SiO 2 22.2g of powder, H 3 BO 3 15.1g of powder, naB 4 O 7 ·10H 2 48.3g of O powder and NaHCO 3 9.0g of powder and the rest of the procedure is as in example 1.
Linear release monitoring:
the monitoring method was the same as in example 1.
And (3) scale inhibition performance monitoring:
the monitoring method was the same as in example 1.
Test results:
1. the linear release monitoring results are as follows:
TABLE 3-1 Total boron concentration in solution as a function of Release time under the circumstances described in example 3
The results show that: the linear relationship between total boron concentration (y) over 30 days relative to release time (x) is y=6.1892x+16.457, correlation coefficient R 2 =0.994. Is released linearly within 30 days, and has a release rate of about 6.57mg L -1 d -1 。
2. The scale inhibition performance monitoring results are as follows:
TABLE 3-2 time dependence of calcium and magnesium ion concentrations in the environment described in example 3
TABLE 3 calcium and magnesium ion concentration as a function of concentration factor under the conditions described in EXAMPLE 3
The result shows that the concentration of the calcium ions is gradually reduced and is stabilized in the concentration range of 104-116 mg/L; the concentration of magnesium ions is gradually reduced and is stabilized in the concentration range of 145-154 mg/L. The scale inhibitor 3 can continuously remove calcium and magnesium ions, so that the concentration of the scale inhibitor is not increased along with the increase of the concentration multiple.
The above embodiments of the present invention are only some of the embodiments, but the scope of the present invention is not limited to the above cases, and formulation modifications or equivalent substitutions in the background of the present invention shall fall within the scope of the present invention.
Claims (5)
1. A linear release type long-acting phosphorus-free scale inhibitor is characterized in that the raw materials comprise four kinds of silicon dioxide powder, orthoboric acid, alkali metal borate and sodium bicarbonate, the mass ratio of the silicon dioxide powder to the orthoboric acid to the alkali metal borate to the sodium bicarbonate is 14.8:15.1:33.0:6.0 or 22.2:15.1:48.3:9.0, and the scale inhibitor is formed by one-step calcination by a melt calcination method.
2. The preparation method of the linear release type long-acting phosphorus-free scale inhibitor is characterized by comprising the following steps of: weighing silicon dioxide powder, orthoboric acid, alkali metal borate and sodium bicarbonate with the mass ratio of 14.8:15.1:33.0:6.0 or 22.2:15.1:48.3:9.0, grinding, fully mixing uniformly, sieving to remove large-particle silicon dioxide, and drying in an oven to remove free moisture; heating the muffle furnace to 500-1200 ℃, quickly placing the raw materials into the muffle furnace, preserving heat for 0.5-2.5h, and simultaneously preheating a die; and immediately taking out the molten product, and naturally cooling and molding the molten product by reverse mold.
3. The linear release type long-acting phosphorus-free scale inhibitor prepared by the preparation method according to claim 2.
4. Use of a scale inhibitor according to claim 1 or 3 for scale inhibition in a liquid environment.
5. The use of scale inhibition according to claim 4, wherein the scale inhibitor is released in a liquid environment and the scale inhibition temperature is not less than 30 ℃; in the scale inhibition performance test, the concentration of calcium ions in the initial liquid environment is more than 0mg/L and less than or equal to 500mg/L, and the concentration of magnesium ions is more than 0mg/L and less than or equal to 500mg/L; the concentration multiple can be increased to 6 times, and meanwhile, the concentration of calcium and magnesium ions is not obviously increased.
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB325099A (en) * | 1929-02-12 | 1930-02-13 | Gordon Redvers Bruton | Compound for use as a water softener |
| US4584104A (en) * | 1984-06-29 | 1986-04-22 | Nalco Chemical Company | Silica inhibition: prevention of silica deposition by boric acid/orthorborate ion |
| CN85100271A (en) * | 1985-04-01 | 1986-08-06 | 北京师范大学 | The agent of a kind of stainless steel hot switching equipment scale descaling |
| JPH06248474A (en) * | 1993-02-23 | 1994-09-06 | Sumitomo Metal Ind Ltd | Composition for removing scale for high cr or high cr-ni alloy |
| CN101327991A (en) * | 2007-06-22 | 2008-12-24 | 顾金源 | Solid water treatment agent for recirculated cooling water system |
| CN102452721A (en) * | 2010-10-20 | 2012-05-16 | 中国石油化工股份有限公司 | Non-phosphorus composite scale and corrosion inhibitor and application thereof in water treatment |
| CN103030239A (en) * | 2011-09-29 | 2013-04-10 | 中国石油化工股份有限公司 | Circulating water treatment method adopting deionized water as supplement water |
| CN103221499A (en) * | 2010-07-20 | 2013-07-24 | C-Ip股份有限公司 | Boron compound suspension |
| CN105668812A (en) * | 2016-02-04 | 2016-06-15 | 江苏盛世水业有限公司 | Corrosion and scale inhibition sterilizing agent for circulating cooling water under high concentration multiple |
| CN105776454A (en) * | 2016-04-04 | 2016-07-20 | 北京师范大学 | Phosphorus-free slow release bacteriostatic agent applied to circulating water system |
| CN106011868A (en) * | 2016-05-04 | 2016-10-12 | 北京师范大学 | Non-phosphorus solid slow-release corrosion inhibitor |
| CN109748401A (en) * | 2017-11-03 | 2019-05-14 | 中国石油化工股份有限公司 | The processing method of recirculated cooling water |
| CN111233433A (en) * | 2020-03-13 | 2020-06-05 | 高时(厦门)石业有限公司 | Slow-release antibacterial purple sand ceramic and preparation process thereof |
-
2022
- 2022-06-22 CN CN202210727842.1A patent/CN115140849B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB325099A (en) * | 1929-02-12 | 1930-02-13 | Gordon Redvers Bruton | Compound for use as a water softener |
| US4584104A (en) * | 1984-06-29 | 1986-04-22 | Nalco Chemical Company | Silica inhibition: prevention of silica deposition by boric acid/orthorborate ion |
| CN85100271A (en) * | 1985-04-01 | 1986-08-06 | 北京师范大学 | The agent of a kind of stainless steel hot switching equipment scale descaling |
| JPH06248474A (en) * | 1993-02-23 | 1994-09-06 | Sumitomo Metal Ind Ltd | Composition for removing scale for high cr or high cr-ni alloy |
| CN101327991A (en) * | 2007-06-22 | 2008-12-24 | 顾金源 | Solid water treatment agent for recirculated cooling water system |
| CN103221499A (en) * | 2010-07-20 | 2013-07-24 | C-Ip股份有限公司 | Boron compound suspension |
| CN102452721A (en) * | 2010-10-20 | 2012-05-16 | 中国石油化工股份有限公司 | Non-phosphorus composite scale and corrosion inhibitor and application thereof in water treatment |
| CN103030239A (en) * | 2011-09-29 | 2013-04-10 | 中国石油化工股份有限公司 | Circulating water treatment method adopting deionized water as supplement water |
| CN105668812A (en) * | 2016-02-04 | 2016-06-15 | 江苏盛世水业有限公司 | Corrosion and scale inhibition sterilizing agent for circulating cooling water under high concentration multiple |
| CN105776454A (en) * | 2016-04-04 | 2016-07-20 | 北京师范大学 | Phosphorus-free slow release bacteriostatic agent applied to circulating water system |
| CN106011868A (en) * | 2016-05-04 | 2016-10-12 | 北京师范大学 | Non-phosphorus solid slow-release corrosion inhibitor |
| CN109748401A (en) * | 2017-11-03 | 2019-05-14 | 中国石油化工股份有限公司 | The processing method of recirculated cooling water |
| CN111233433A (en) * | 2020-03-13 | 2020-06-05 | 高时(厦门)石业有限公司 | Slow-release antibacterial purple sand ceramic and preparation process thereof |
Non-Patent Citations (8)
| Title |
|---|
| Jun Cui等.Effect of temperature on the passivation behaviour of the slow-release inhibitor for carbon steel in the simulated recirculating water.Corrosion Processes and Corrosion Control.2019,第54卷(第4期),全文. * |
| Jun Cui等.Novel inorganic solid controlled-release inhibitor for Q235-b anticorrosion treatment in 1 M HCl.Applied Surface Science.2017,第416卷全文. * |
| Jun Cui等.Toward a Slow-Release Borate Inhibitor To Control Mild Steel Corrosion in Simulated Recirculating Water.ACS Appl. Mater. Interfaces.2018,第10卷(第4期),全文. * |
| 刘保雷 ; 刘丹 ; 计海峰 ; 王卫东 ; 徐海龙 ; .硼酸盐功能材料研究进展.广州化工.2014,(第23期),全文. * |
| 史蕊蕊等.B2O3-SiO2-Na2O缓释抑菌剂的合成及性能表征.无机材料学报.2017,第32卷(第5期),第529-534页. * |
| 张林进等.水溶液中硼氧配阴离子的存在形式及影响因素.无机盐工业.2008,第40卷(第2期),第4-8页. * |
| 殷仁鹏等.多硼酸盐的分散作用及其对碳酸钙沉淀的影响.环境工程学报.2017,第11卷(第9期),第4993-5000页. * |
| 黄长兴等.B2O3-SiO2-Na2O缓释材料的合成工艺参数优化及其缓释机理.无机材料学报.2019,第34卷(第6期),第653-659页. * |
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