Green low-phosphorus scale-inhibiting boiler treating agent and preparation method thereof

Abstract

The invention relates to the technical field of boiler water treatment, and particularly provides a green low-phosphorus scale-inhibiting boiler treating agent and a preparation method thereof. The green low-phosphorus scale-inhibiting boiler treating agent is prepared from the following raw materials in percentage by mass: 18 to 26 percent of fructus hippophae, 13 to 18 percent of wheat bran, 10 to 15 percent of persimmon, 8 to 13 percent of bruguiera gymnorrhiza bark, 5 to 10 percent of radix sophorae flavescentis and the balance of pure water. According to the environment-friendly low-phosphorus scale-inhibiting boiler treating agent and the preparation method thereof, the scale-inhibiting and anti-corrosion effects are considered, and the low phosphate addition amount and the high scale-inhibiting effect are balanced, so that environment-friendly and environment-friendly chemistry is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler water treatment, and particularly relates to a green low-phosphorus scale inhibitor for boilers and a preparation method thereof. Background Art

[0002] With the rapid development of economic construction, the use of boilers is increasing. As a special equipment, boilers are high-energy devices that provide hot water, steam and other thermal energy. Therefore, the treatment of boiler water is very important. The problems existing in boiler water treatment are high phosphorus content in sewage and scale formation. Iron boilers in vast rural areas are limited by conditions, lacking sewage treatment, with high hardness and pH value of boiler water. After scale formation in the boiler, excessive phosphates are added to inhibit scale, further increasing the phosphorus content and pH value of sewage, exacerbating the burden of sewage treatment, which undoubtedly increases the subsequent emission pollution and does not conform to the current environmental protection call.

[0003] Therefore, it is necessary to develop a boiler treatment agent with low phosphate, that is, "low phosphorus", and capable of inhibiting scale. Summary of the Invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide a green low-phosphorus scale inhibitor for boilers and a preparation method thereof.

[0005] On the one hand, the present invention provides a preparation method of a green low-phosphorus scale inhibitor for boilers, and the preparation method of the green low-phosphorus scale inhibitor for boilers is as follows: Take sea buckthorn fruit with a mass fraction of 18 - 26%, wheat bran with a mass fraction of 13 - 18%, persimmons with a mass fraction of 10 - 15%, Bruguiera gymnorrhiza bark with a mass fraction of 8 - 13%, Sophora flavescens with a mass fraction of 5 - 10% and make up the balance with pure water; Cut the sea buckthorn fruit, the wheat bran and the persimmons into pieces and pass through a 50-mesh sieve, then add them to a flash extractor, break them at 32°C and a rotation speed of 6000 r / min for 90 s, filter with a 100-mesh filter screen and let stand for 5 h to obtain an acid leaching extract; Cut the Bruguiera gymnorrhiza bark and the Sophora flavescens into pieces and pass through a 50-mesh sieve, then add them to the flash extractor together with the pure water, break them at 20°C and a rotation speed of 4000 r / min for 150 s, and filter with a 100-mesh filter screen to obtain a rough filter extract; Mix the acid leaching extract and the rough filter extract, add 95% ethanol with a mass 6 times that of the acid leaching extract and the rough filter extract, mix and immerse them at 20°C for 7 h, then filter with a 400-mesh filter screen to obtain an alcohol leaching extract; Distill the alcohol leaching extract at 80°C and a vacuum degree of 800 mbar until no liquid continuously flows out, and collect the remaining liquid to obtain a plant extract; The green low-phosphorus scale-inhibiting boiler treatment agent is obtained by mixing 71% by mass of the plant extract, 12% by mass of trisodium phosphate dodecahydrate and the balance of pure water.

[0006] Furthermore, the mass fraction of the sea buckthorn fruit is 22%.

[0007] Furthermore, the mass fraction of the wheat bran is 15%.

[0008] Furthermore, the mass fraction of the persimmon is 13%.

[0009] Furthermore, the mass fraction of the Bruguiera gymnorrhiza bark is 10%.

[0010] Furthermore, the mass fraction of Sophora flavescens is 8%.

[0011] On the other hand, the present invention provides a green low-phosphorus scale inhibitor for boiler treatment agent prepared by the method for preparing the green low-phosphorus scale inhibitor for boiler treatment agent as described above.

[0012] The present invention can bring the following beneficial effects: The green low-phosphorus scale-inhibiting boiler treatment agent of the present invention and its preparation method take into account both scale inhibition and anti-corrosion effects, balance the low phosphate addition amount and high scale inhibition effect, so as to achieve environmentally friendly green chemistry; its possible principles are as follows: Firstly, the present invention mainly extracts phytic acid in wheat bran and persimmon and polysaccharides and tannin in seabuckthorn fruit and persimmon by mixing seabuckthorn fruit and persimmon in a warm acidic environment, and extracts polyamines and lignin in wheat bran in the subsequent alcohol extraction. The acid in seabuckthorn and persimmon not only creates a low pH environment for the extraction of phytic acid in wheat bran, but also maintains a weak alkaline environment of pH value of alkaline boiler water with trisodium phosphate dodecahydrate during later use, thereby preventing excessive alkaline corrosion and making phytic acid easy to complex metal ions, reducing phosphate scale inhibition pressure, and further reducing phosphate dosage. Tannin and antibacterial substances are also extracted from Bruguiera gymnorrhiza bark and Sophora flavescens.

[0013] Tannins and polyamines can form complexes with metal ions, forming a protective film on the metal surface, namely the tannin-polyamine-metal complex film, thereby preventing metal corrosion, avoiding roughness on the inner wall of the metal boiler, and eliminating the electrostatic attraction between the metal surface and scaling substances, thereby inhibiting the adhesion of scaling substances on the metal heating surface and playing a scaling inhibition effect; lignin has a dispersing effect and stabilizes the system; antibacterial substances prevent the growth of microorganisms and prevent corrosion caused by microbial metabolism; polysaccharides are antioxidants in the system to prevent the system from deteriorating prematurely.

[0014] The above conditions are indispensable to work together. The parameters in the present invention are obtained by chance, and the effect of green low-phosphorus scale inhibition is finally achieved. DETAILED DESCRIPTION

[0015] In order to more clearly explain the overall concept of the present invention, the overall scheme of the present invention is described in detail in the form of embodiments below; in the following description, a large number of specific details are given to provide a more thorough understanding of the present invention; however, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details; in other examples, in order to avoid confusion with the present invention, some technical features known in the art are not described.

[0016] In the present invention, the flash extractor was purchased from Beijing Jinyang Wanda Technology Co., Ltd., model JHBE-100A; the vacuum distiller was purchased from Zhengzhou Yarong Instrument Co., Ltd., model RE-2000E; trisodium phosphate dodecahydrate was purchased from Guangdong Jinlong Chemical Import and Export Co., Ltd., CAS7601-54-9, with an effective matter content of 98%; the persimmon was an immature heart-shaped persimmon fruit purchased from Taitong Gardening Farm in Tai'an Development Zone, with a condensed tannin content of 41.90 mg / g; seabuckthorn fruit was purchased from Urumqi Bosikaka Trading Co., Ltd., with an original fruit pH of 4.2±0.1; wheat bran was purchased from Shijiazhuang Fengerwo Biotechnology Co., Ltd., with a phytic acid content of 4%±0.1%; Bruguiera gymnorrhiza bark and Sophora flavescens were purchased from Anhui Kangweifu Pharmaceutical Co., Ltd., with a water content of 5%; the boiler was purchased from Taikang County Yincheng Sunshine Boiler Co., Ltd., a vertical 0.5-ton model with a maximum pressure of 1.25 MPa, and was washed after one test before entering the next experiment.

[0017] Unless otherwise specified, all raw material components in the following examples can be purchased from commercial sources, the experimental instruments used are conventional laboratory experimental instruments, and the performance test methods are known in the art. The overall operating space environment is 25°C and the air humidity is 30%.

[0018] The preferred implementation is as follows: Embodiment 1: The green low-phosphorus scale-inhibiting boiler treatment agent is made by the following method: Take 22% by weight of seabuckthorn fruit, 15% by weight of wheat bran, 13% by weight of persimmon, 10% by weight of Bruguiera gymnorrhiza bark, 8% by weight of Sophora flavescens and make up the balance with pure water; The seabuckthorn fruit, the wheat bran and the persimmon are chopped until they pass through a 50-mesh sieve, and then added into a flash extractor, crushed at 32° C. and a rotation speed of 6000 r / min for 90 seconds, filtered through a 100-mesh filter and allowed to stand for 5 hours to obtain an acid extraction solution; The Bruguiera gymnorrhiza bark and the Sophora flavescens were chopped until they passed through a 50-mesh sieve, and then added into a flash extractor together with the pure water, crushed at 20° C. and a rotation speed of 4000 r / min for 150 seconds, and then filtered with a 100-mesh filter to obtain a coarse filtration extract; Mix the acid leaching extract and the rough filtration extract, add 95% ethanol with a mass 6 times that of the acid leaching extract and the rough filtration extract, mix and immerse at 20°C for 7 h, then filter through a 400-mesh sieve to obtain an alcohol leaching extract; subject the alcohol leaching extract to vacuum distillation at 80°C and a vacuum degree of 800 mbar until no liquid continuously flows out, and collect the remaining liquid to obtain a plant extract; Mix 71 parts by mass of the plant extract, 12 parts by mass of trisodium phosphate dodecahydrate, and make up the balance with pure water to obtain the green low-phosphorus scale inhibitor boiler treatment agent.

[0019] Examples 2 to 11: The difference between Example 2 and Example 1 is only that the mass fraction of sea buckthorn fruit is 18%; The difference between Example 3 and Example 1 is only that the mass fraction of sea buckthorn fruit is 26%; The difference between Example 4 and Example 1 is only that the mass fraction of wheat bran is 13%; The difference between Example 5 and Example 1 is only that the mass fraction of wheat bran is 18%; The difference between Example 6 and Example 1 is only that the mass fraction of persimmon is 10%; The difference between Example 7 and Example 1 is only that the mass fraction of persimmon is 15%; The difference between Example 8 and Example 1 is only that the mass fraction of Bruguiera gymnorrhiza bark is 8%; The difference between Example 9 and Example 1 is only that the mass fraction of Bruguiera gymnorrhiza bark is 13%; The difference between Example 10 and Example 1 is only that the mass fraction of Sophora flavescens is 5%; The difference between Example 11 and Example 1 is only that the mass fraction of Sophora flavescens is 10%.

[0020] Comparative Examples 1 to 23: The difference between Comparative Example 1 and Example 1 is only that the mass fraction of sea buckthorn fruit is 9%; The difference between Comparative Example 2 and Example 1 is only that the mass fraction of sea buckthorn fruit is 40%; The difference between Comparative Example 3 and Example 1 is only that the mass fraction of wheat bran is 6%; The difference between Comparative Example 4 and Example 1 is only that the mass fraction of wheat bran is 32%; The difference between Comparative Example 5 and Example 1 is only that the mass fraction of persimmon is 5%; The difference between Comparative Example 6 and Example 1 is only that the mass fraction of persimmon is 30%; The difference between Comparative Example 7 and Example 1 is only that the mass fraction of Bruguiera gymnorrhiza bark is 4%; The difference between Comparative Example 8 and Example 1 is that the mass fraction of Bruguiera gymnorrhiza bark is 25%; The only difference between Comparative Example 9 and Example 1 is that the mass fraction of Sophora flavescens is 2%; The only difference between Comparative Example 10 and Example 1 is that the mass fraction of Sophora flavescens is 20%; The difference between Comparative Example 11 and Example 1 is that the temperature of vacuum distillation is 65°C; The difference between Comparative Example 12 and Example 1 is that the temperature of vacuum distillation is 95°C; The only difference between Comparative Example 13 and Example 1 is that the mass fraction of the plant extract is 50%; The only difference between Comparative Example 14 and Example 1 is that the mass fraction of the plant extract is 85%; The only difference between Comparative Example 15 and Example 1 is that the mass fraction of trisodium phosphate dodecahydrate is 5%; The only difference between Comparative Example 16 and Example 1 is that the mass fraction of trisodium phosphate dodecahydrate is 25%; The only difference between Comparative Example 17 and Example 1 is that the seabuckthorn fruit is replaced with wheat bran, persimmon, Bruguiera gymnorrhiza bark and Sophora flavescens of the same mass ratio as that of Example 1; The only difference between Comparative Example 18 and Example 1 is that the wheat bran is replaced with sea buckthorn fruit, persimmon, Bruguiera gymnorrhiza bark and Sophora flavescens in the same mass ratio as that of Example 1; The only difference between Comparative Example 19 and Example 1 is that persimmon is replaced by sea buckthorn fruit, wheat bran, Bruguiera gymnorrhiza bark and Sophora flavescens of the same mass ratio as that of Example 1; The only difference between Comparative Example 20 and Example 1 is that the bark of Bruguiera gymnorrhiza is replaced with seabuckthorn fruit, wheat bran, persimmon and sophora flavescens of the same mass ratio as that of Example 1; The only difference between Comparative Example 21 and Example 1 is that Sophora flavescens is replaced with seabuckthorn fruit, wheat bran, persimmon and Bruguiera gymnorrhiza bark of the same mass ratio as Example 1; The difference between Comparative Example 22 and Example 1 is that the plant extract is replaced with pure water of equal mass; The difference between Comparative Example 23 and Example 1 is that trisodium phosphate dodecahydrate is replaced with pure water of equal mass; Blank group: The blank group did not add green low-phosphorus scale inhibitor boiler treatment agent and directly operated at 130℃.

[0021] Prepare a corresponding number of 0.5 tons of clean boilers or boilers to place the green low-phosphorus scale-inhibiting boiler treatment agent prepared in each example: inject water at 0.9 times the water volume of the highest water level of the boiler, and add 0.2 times the mass of the injected water. Prepare a corresponding number of 16MnR type rust-free and scale-free clean steel plates with a thickness, length and width of 0.5cm×25cm×10cm. During the experiment of each boiler in the example, one of the above clean steel plates is suspended in the middle and lower part, and heated to boiling after pressurization of 1.25MPa. After one week, drain and repeat the above steps in a cycle for 70 days; the operation is specifically as follows: the operating pipeline is a 15m long output steam pipeline, the steam is transferred to a small cooler for condensation and then flows back to the boiler through a 15m long condensation reflux pipeline.

[0022] Take out each steel plate, wash and dry it, weigh it and calculate the reduced mass of the steel plate as the anti-corrosion effect, in g, with 3 decimal places; collect, weigh and calculate the mass of the scale on the inner wall of each boiler as the scale inhibition effect, in g, with integer places. The test results are shown in Table 1.

[0023] Table 1: Test results of anti-scaling and anti-corrosion effects of various examples

[0024] It can be seen from the data in Table 1 that, compared with other examples, the embodiments of the present invention, especially the solution of Embodiment 1 of the present invention, has less scaling and less steel plate reduction, that is, the scale inhibition effect is good, and the secondary anti-corrosion effect is also good.

[0025] To further compare the scale inhibition and low-phosphorus sewage discharge effects of the present invention and the existing phosphate scale inhibitor, the prior art was designed as a control group. According to the same experimental method as above, the difference between the control group and Example 1 was only that the green low-phosphorus scale inhibitor of the boiler treatment agent was replaced with a conventional scale inhibitor of equal mass, trisodium phosphate CAS No. 7601-54-9; and after the experiment, the RB-504 desktop phosphate detector was used to measure the phosphate content of the boiler drainage by ammonium molybdate spectrophotometry, the unit was mg / L, accurate to one decimal place, and the test results are shown in Table 2.

[0026] Table 2: Test results of scale inhibition and low phosphorus sewage discharge effect of Example 1 and control group

[0027] It can be seen from the data in Table 2 that compared with the control group of the prior art, the green, low-phosphorus scale-inhibiting boiler treatment agent and its preparation method of Example 1 of the present invention have good scale inhibition effect while reducing the phosphate content in the sewage, balancing the low phosphate emission and high scale inhibition effect, and realizing environmentally friendly green chemistry.

[0028] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A method for preparing a green, low-phosphorus scale-inhibiting boiler treatment agent, characterized in that: The preparation method of the green low-phosphorus scale-inhibiting boiler treatment agent is as follows: Take 18-26% by weight of seabuckthorn fruit, 13-18% by weight of wheat bran, 10-15% by weight of persimmon, 8-13% by weight of Bruguiera gymnorrhiza bark, 5-10% by weight of Sophora flavescens and make up the balance with pure water; The seabuckthorn fruit, the wheat bran and the persimmon are chopped until they pass through a 50-mesh sieve, and then added into a flash extractor, crushed at 32° C. and a rotation speed of 6000 r / min for 90 seconds, filtered through a 100-mesh filter and allowed to stand for 5 hours to obtain an acid extraction solution; The Bruguiera gymnorrhiza bark and the Sophora flavescens were chopped until they passed through a 50-mesh sieve, and then added into a flash extractor together with the pure water, crushed at 20° C. and a rotation speed of 4000 r / min for 150 seconds, and then filtered with a 100-mesh filter to obtain a coarse filtration extract; The acid leaching extract and the crude filtration extract are mixed, and 95% ethanol having a mass that is 6 times the mass of the acid leaching extract and the crude filtration extract is added, and the mixture is immersed for 7 hours at 20° C., and then filtered through 400 mesh to obtain an alcohol leaching extract; the alcohol leaching extract is distilled at 80° C. and a vacuum degree of 800 mbar until no liquid continuously flows out, and the remaining liquid is collected to obtain a plant extract; The green low-phosphorus scale-inhibiting boiler treatment agent is obtained by mixing 71% by mass of the plant extract, 12% by mass of trisodium phosphate dodecahydrate and the balance of pure water.

2. The method for preparing a green, low-phosphorus scale-inhibiting boiler treatment agent according to claim 1, characterized in that: The mass fraction of the seabuckthorn fruit is 22%.

3. The method for preparing a green, low-phosphorus scale-inhibiting boiler treatment agent according to claim 1, characterized in that: The mass fraction of the wheat bran is 15%.

4. The method for preparing a green, low-phosphorus scale-inhibiting boiler treatment agent according to claim 1, characterized in that: The mass fraction of the persimmon is 13%.

5. The method for preparing a green, low-phosphorus scale-inhibiting boiler treatment agent according to claim 1, characterized in that: The mass fraction of the Bruguiera gymnorrhiza bark is 10%.

6. The method for preparing a green, low-phosphorus scale-inhibiting boiler treatment agent according to claim 1, characterized in that: The mass fraction of the Sophora flavescens is 8%.

7. A green low-phosphorus scale inhibitor for boiler treatment agent prepared by the method for preparing the green low-phosphorus scale inhibitor for boiler treatment agent as described in any one of claims 1 to 6.

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