A green, low-phosphorus scale inhibitor and its preparation method

Abstract

This invention relates to the field of boiler water treatment technology, specifically providing a green, low-phosphorus scale inhibitor boiler treatment agent and its preparation method. The raw materials for preparing the green, low-phosphorus scale inhibitor boiler treatment agent include: 18-26% by weight of sea buckthorn fruit, 13-18% by weight of wheat bran, 10-15% by weight of persimmon, 8-13% by weight of olive bark, 5-10% by weight of sophora flavescens, and the balance being pure water. This invention's green, low-phosphorus scale inhibitor boiler treatment agent and its preparation method balance scale inhibition and corrosion prevention effects, achieving a balance between low phosphate addition and high scale inhibition effect, thus realizing environmentally friendly green chemistry.

Description

Technical Field

[0001] This invention relates to the field of boiler water treatment technology, and in particular to a green, low-phosphorus scale inhibitor and its preparation method. Background Technology

[0002] The use of boilers has increased significantly with rapid economic development. As special equipment, boilers are high-energy devices that provide hot water, steam, and other thermal energy, making boiler water treatment extremely important. Problems in boiler water treatment include high phosphorus content in the blowdown and scaling. In many rural areas, iron boilers lack adequate blowdown treatment due to limited resources, and the boiler water has high hardness and pH. After scaling occurs, excessive amounts of phosphate are added to inhibit scale formation, further increasing the phosphorus content and pH of the wastewater, exacerbating the burden of blowdown treatment. This undoubtedly increases subsequent pollution and is inconsistent with current environmental protection initiatives.

[0003] Therefore, there is a need to develop a boiler treatment agent that is low in phosphate, i.e., "low phosphorus," and can inhibit scale formation. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a green, low-phosphorus scale inhibitor for boiler treatment and its preparation method.

[0005] On one hand, the present invention provides a method for preparing a green, low-phosphorus scale inhibitor boiler treatment agent, the method of which is as follows:

[0006] Take 18-26% by weight of sea buckthorn fruit, 13-18% by weight of wheat bran, 10-15% by weight of persimmon, 8-13% by weight of bark of the Rhizoma Rhizoma Citri Reticulatae, 5-10% by weight of Sophorae Flavescentis, and make up the remainder with pure water.

[0007] The sea buckthorn fruit, wheat bran and persimmon were chopped and passed through a 50-mesh sieve and then added to a flash extractor. After crushing for 90 seconds at 32°C and 6000 r / min, the extract was filtered through a 100-mesh filter and allowed to stand for 5 hours to obtain an acid extract.

[0008] The bark of the Rhizoma Rhizoma and the Sophorae Flavescentis were chopped and passed through a 50-mesh sieve. They were then added to a flash extractor along with pure water and crushed at 20°C and 4000 r / min for 150 seconds. The extract was then filtered through a 100-mesh filter to obtain a coarse filtrate.

[0009] The acid extract and the coarse filtrate were mixed and then 95% ethanol (6 times the mass of the acid extract and the coarse filtrate) was added. The mixture was soaked at 20°C for 7 hours and then filtered through a 400-mesh filter to obtain an alcohol extract. The alcohol extract was then distilled at 80°C under vacuum of 800 mbar until no liquid flowed out continuously. The remaining liquid was collected to obtain the plant extract.

[0010] The green, low-phosphorus scale inhibitor boiler treatment agent is prepared by mixing 71% by weight of the plant extract, 12% by weight of trisodium dodecahydrate, and the remainder with pure water.

[0011] Furthermore, the sea buckthorn fruit has a mass fraction of 22%.

[0012] Furthermore, the wheat bran has a mass fraction of 15%.

[0013] Furthermore, the persimmon has a mass fraction of 13%.

[0014] Furthermore, the mass fraction of the olive bark is 10%.

[0015] Furthermore, the mass fraction of the Sophora flavescens is 8%.

[0016] On the other hand, the present invention provides a green low-phosphorus scale inhibitor prepared by the preparation method of the green low-phosphorus scale inhibitor as described above.

[0017] The present invention can bring the following beneficial effects:

[0018] The present invention relates to a green, low-phosphorus scale inhibitor boiler treatment agent and its preparation method, which combines scale inhibition and corrosion prevention effects, balancing low phosphate addition with high scale inhibition effect to achieve environmentally friendly green chemistry; its possible principle is as follows:

[0019] Firstly, this invention primarily involves mixing sea buckthorn berries and persimmons with wheat bran, extracting phytic acid from the wheat bran and persimmons, as well as polysaccharides and tannins from the sea buckthorn berries and persimmons, in a warm, acidic environment. Subsequently, polyamines and lignin are extracted from the wheat bran via alcohol extraction. The acids in sea buckthorn and persimmons not only create a low-pH environment for the extraction of phytic acid from the wheat bran but also maintain a slightly alkaline environment for the boiler water (preventing excessive alkaline corrosion) with trisodium phosphate dodecahydrate, thus facilitating the complexation of phytic acid with metal ions, reducing the pressure on phosphate scale inhibition, and further reducing the amount of phosphate used. Tannins and antibacterial substances were also extracted from the bark of the Rhizoma Rhizoma Cimicifugae and the herb Sophorae Flavescentis.

[0020] Tannins and polyamines can form complexes with metal ions, forming a protective film on the metal surface, namely a tannin-polyamine-metal complex film, thereby preventing metal corrosion, avoiding roughness of the inner wall surface of the metal boiler, eliminating the electrostatic attraction between the metal surface and scale-forming substances, thus inhibiting the adhesion of scale-forming substances on the heated metal surface and playing a scale inhibition role; lignin plays a dispersing role and stabilizes the system; antibacterial substances prevent the growth of microorganisms and prevent corrosion caused by microbial metabolism; polysaccharides have antioxidant properties in the system and prevent the system from deteriorating prematurely.

[0021] All of the above conditions work together and are indispensable. The parameters obtained in this invention are accidental, ultimately achieving the effect of green, low-phosphorus scale inhibition. Detailed Implementation

[0022] To more clearly illustrate the overall concept of the present invention, the overall solution of the present invention will be described in detail below by way of embodiments; in the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention; however, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of these details; in other instances, some technical features known in the art have not been described in order to avoid confusion with the present invention.

[0023] In this invention, the flash extractor was purchased from Beijing Jinyang Wanda Technology Co., Ltd., model JHBE-100A; the vacuum distillation apparatus was purchased from Zhengzhou Yarong Instrument Co., Ltd., model RE-2000E; the trisodium dodecahydrate was purchased from Guangdong Jinlong Chemical Import & Export Co., Ltd., CAS7601-54-9, with an effective content of 98%; the persimmons were unripe chicken heart persimmons purchased from Taitong Horticulture Farm in Taian Development Zone, with a condensed tannin content of 41.90 mg / g; the sea buckthorn fruit was purchased from Urumqi Bosikaka Trading Co., Ltd., with a pH of 4.2±0.1; the wheat bran was purchased from Shijiazhuang Fengerwo Biotechnology Co., Ltd., with a phytic acid content of 4%±0.1%; the bark of the Rhizoma Rhizoma et Radix and Sophorae Flavescentis were purchased from Anhui Kangweifu Pharmaceutical Co., Ltd., with a moisture 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 cleaned after each test before being used in the next test.

[0024] Unless otherwise specified, all raw material components in the following examples are commercially available, all experimental instruments used are standard laboratory instruments, and the performance testing methods are those known in the art. The overall operating environment was 25°C and 30% humidity.

[0025] The preferred implementation method is as follows:

[0026] Example 1:

[0027] The following methods are used to prepare a green, low-phosphorus scale inhibitor for boiler treatment:

[0028] Take 22% sea buckthorn fruit, 15% wheat bran, 13% persimmon, 10% bark of Rhizoma Pinelliae, 8% Sophorae Flavescentis, and make up the remainder with pure water.

[0029] The sea buckthorn fruit, wheat bran and persimmon were chopped and passed through a 50-mesh sieve and then added to a flash extractor. After crushing for 90 seconds at 32°C and 6000 r / min, the extract was filtered through a 100-mesh filter and allowed to stand for 5 hours to obtain an acid extract.

[0030] The bark of the Rhizoma Rhizoma and the Sophorae Flavescentis were chopped and passed through a 50-mesh sieve. They were then added to a flash extractor along with pure water and crushed at 20°C and 4000 r / min for 150 seconds. The extract was then filtered through a 100-mesh filter to obtain a coarse filtrate.

[0031] The acid extract and the coarse filtrate were mixed and then 95% ethanol (6 times the mass of the acid extract and the coarse filtrate) was added. The mixture was soaked at 20°C for 7 hours and then filtered through a 400-mesh filter to obtain an alcohol extract. The alcohol extract was then distilled at 80°C under vacuum of 800 mbar until no liquid flowed out continuously. The remaining liquid was collected to obtain the plant extract.

[0032] The green, low-phosphorus scale inhibitor boiler treatment agent is prepared by mixing 71% by weight of the plant extract, 12% by weight of trisodium dodecahydrate, and the remainder with pure water.

[0033] Examples 2 to 11:

[0034] The only difference between Example 2 and Example 1 is that the sea buckthorn fruit has a mass fraction of 18%.

[0035] The only difference between Example 3 and Example 1 is that the mass fraction of sea buckthorn fruit is 26%.

[0036] The only difference between Example 4 and Example 1 is that the mass fraction of wheat bran is 13%.

[0037] The only difference between Example 5 and Example 1 is that the mass fraction of wheat bran is 18%.

[0038] The only difference between Example 6 and Example 1 is that the mass fraction of persimmons is 10%.

[0039] The only difference between Example 7 and Example 1 is that the mass fraction of persimmons is 15%.

[0040] The only difference between Example 8 and Example 1 is that the mass fraction of the olive bark is 8%.

[0041] The only difference between Example 9 and Example 1 is that the mass fraction of the olive bark is 13%.

[0042] The only difference between Example 10 and Example 1 is that the mass fraction of Sophora flavescens is 5%.

[0043] The only difference between Example 11 and Example 1 is that the mass fraction of Sophora flavescens is 10%.

[0044] Comparative Examples 1 to 23:

[0045] The only difference between Comparative Example 1 and Example 1 is that the sea buckthorn fruit has a mass fraction of 9%.

[0046] The only difference between Comparative Example 2 and Example 1 is that the mass fraction of sea buckthorn fruit is 40%.

[0047] The only difference between Comparative Example 3 and Example 1 is that the mass fraction of wheat bran is 6%;

[0048] The only difference between Comparative Example 4 and Example 1 is that the mass fraction of wheat bran is 32%.

[0049] The only difference between Comparative Example 5 and Example 1 is that the mass fraction of persimmons is 5%;

[0050] The only difference between Comparative Example 6 and Example 1 is that the mass fraction of persimmons is 30%.

[0051] The only difference between Comparative Example 7 and Example 1 is that the mass fraction of the olive bark is 4%;

[0052] The only difference between Comparative Example 8 and Example 1 is that the mass fraction of the olive bark is 25%.

[0053] The only difference between Comparative Example 9 and Example 1 is that the mass fraction of Sophora flavescens is 2%;

[0054] The only difference between Comparative Example 10 and Example 1 is that the mass fraction of Sophora flavescens is 20%.

[0055] The only difference between Comparative Example 11 and Example 1 is that the temperature of vacuum distillation is 65°C.

[0056] The only difference between Comparative Example 12 and Example 1 is that the vacuum distillation temperature is 95°C;

[0057] The only difference between Comparative Example 13 and Example 1 is that the mass fraction of the plant extract is 50%.

[0058] The only difference between Comparative Example 14 and Example 1 is that the mass fraction of the plant extract is 85%.

[0059] The only difference between Comparative Example 15 and Example 1 is that the mass fraction of trisodium phosphate dodecahydrate is 5%;

[0060] The only difference between Comparative Example 16 and Example 1 is that the mass fraction of trisodium phosphate dodecahydrate is 25%.

[0061] The only difference between Comparative Example 17 and Example 1 is that the sea buckthorn fruit was replaced with wheat bran, persimmon, bark of the tamarisk tree, and sophora flavescens in the same mass ratio as in Example 1.

[0062] The only difference between Comparative Example 18 and Example 1 is that the wheat bran was replaced with sea buckthorn fruit, persimmon, olive bark and sophora flavescens in the same mass ratio as in Example 1.

[0063] The only difference between Comparative Example 19 and Example 1 is that the persimmons were replaced with sea buckthorn fruit, wheat bran, bark of the tamarisk tree, and sophora flavescens in the same mass ratio as in Example 1.

[0064] The only difference between Comparative Example 20 and Example 1 is that the bark of the olive tree was replaced with sea buckthorn fruit, wheat bran, persimmon and sophora flavescens in the same mass ratio as in Example 1.

[0065] The only difference between Comparative Example 21 and Example 1 is that Sophora flavescens is replaced with sea buckthorn fruit, wheat bran, persimmon and bark of the same mass ratio as in Example 1.

[0066] The only difference between Comparative Example 22 and Example 1 is that the plant extract was replaced with an equal mass of pure water;

[0067] The only difference between Comparative Example 23 and Example 1 is that trisodium dodecahydrate is replaced with an equal mass of pure water;

[0068] Blank group: The blank group does not use green low-phosphorus scale inhibitor boiler treatment agent and runs directly at 130℃.

[0069] Prepare 0.5-ton cleaned boilers or boiler cycles corresponding to the example quantity to add the green low-phosphorus scale inhibitor boiler treatment agent prepared in each example: inject water at 0.9 times the water volume of the boiler's highest water level, and add 0.2 times the mass of the injected water to the green low-phosphorus scale inhibitor boiler treatment agent. Prepare rust-free and scale-free clean steel plates of type 16MnR with a thickness of 0.5cm × 25cm × 10cm corresponding to the example quantity. During the boiler experiment of each example, suspend one of the above clean steel plates in the middle and lower part, pressurize to 1.25MPa, heat to boiling and run, drain after one week and repeat the above steps in a cycle for 70 days; the specific operation is 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 return pipeline.

[0070] Each steel plate was removed, washed, and dried. The mass reduction of the steel plate was then weighed and calculated as the corrosion prevention effect, in grams, rounded to three decimal places. The mass of scale formed on the inner wall of each boiler was collected, weighed, and calculated as the scale inhibition effect, in grams, rounded to the nearest integer. The results of the experiment are shown in Table 1.

[0071] Table 1: Test results of scale inhibition and corrosion prevention effects for each example

[0072]

[0073] As can be seen from the data in Table 1, compared with other examples, the scale buildup and steel plate reduction of the embodiments of the present invention, especially Embodiment 1 of the present invention, are less, that is, the scale inhibition effect is good and the secondary corrosion prevention effect is also good.

[0074] To further compare the scale inhibition and low-phosphorus wastewater discharge effects of the present invention with those of existing phosphate scale inhibitors, the existing technology was designed as a control group. The same experimental method was used as described above. The only difference between the control group and Example 1 was that the green low-phosphorus scale inhibitor boiler treatment agent was replaced with an equal mass of conventional scale inhibitor trisodium phosphate (CAS No. 7601-54-9). After the experiment, the phosphate content of the boiler wastewater was measured using an RB-504 benchtop phosphate analyzer with ammonium molybdate spectrophotometry. The unit was mg / L, accurate to one decimal place. The results of the experiment are shown in Table 2.

[0075] Table 2: Test results of scale inhibition and low-phosphorus wastewater discharge effects in Example 1 and the control group

[0076]

[0077] As can be seen from the data in Table 2, compared with the control group of the prior art, the green low-phosphorus scale inhibitor boiler treatment agent and its preparation method of Example 1 of the present invention have a good scale inhibition effect while reducing the phosphate content in the sewage discharge, balancing the low phosphate discharge and the high scale inhibition effect, and realizing environmentally friendly green chemistry.

[0078] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within 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 mass of sea buckthorn fruit, 13-18% by mass of wheat bran, 10-15% by mass of persimmon, 8-13% by mass of bruguiera gymnorrhiza bark, 5-10% by mass of sophora flavescens, and supplement the rest with pure water; The sea buckthorn fruit, the wheat bran and the persimmon are chopped to pass through a 50-mesh sieve, then added to a flash extractor, broken at 32°C and a rotation speed of 6000 r / min for 90 s, filtered with a 100-mesh filter screen and left to stand for 5 h to obtain an acid leaching extract; The bruguiera gymnorrhiza bark and the sophora flavescens are chopped to pass through a 50-mesh sieve, then added to a flash extractor together with the pure water, broken at 20°C and a rotation speed of 4000 r / min for 150 s, and filtered with a 100-mesh filter screen to obtain a coarse filter extract; The acid leaching extract and the coarse filter extract are mixed, 95% ethanol is added at 20°C in an amount of 6 times the mass of the acid leaching extract and the coarse filter extract, and left to immerse for 7 h, then filtered with a 400-mesh screen to obtain an alcohol leaching extract; the alcohol leaching extract is distilled at 80°C and a vacuum degree of 800 mbar to collect the remaining liquid to obtain a plant extract; The plant extract is mixed with 12% by mass of twelve-water trisodium phosphate and the rest with pure water to obtain the green low-phosphorus scale-inhibiting boiler treatment agent.

2. The preparation method of the green, low-phosphorus scale inhibitor boiler treatment agent according to claim 1, characterized in that, The mass fraction of the sea buckthorn fruit is 22%.

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

4. The method of claim 1, wherein the green low phosphorus scale inhibiting boiler treatment agent is prepared by the steps of: The mass fraction of the persimmon is 13%.

5. The preparation method of the green, low-phosphorus scale inhibitor boiler treatment agent according to claim 1, characterized in that, The mass fraction of the bruguiera gymnorrhiza bark is 10%.

6. The method of claim 1, wherein the green low phosphorus scale inhibiting boiler treatment agent is prepared by the steps of: The mass fraction of the sophora flavescens is 8%.

7. A green low-phosphorus scale-inhibiting boiler treatment agent prepared by the preparation method of the green low-phosphorus scale-inhibiting boiler treatment agent according to any one of claims 1-6.

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