Energy-saving circulating water additive and preparation method thereof

Abstract

The invention relates to an energy-saving circulating water additive and a preparation method thereof, and belongs to the technical field of water additives. According to the invention, CTAB and stigmasterol are combined, and the silane coupling agent is added, so that the dispersibility and stability of the active component in water are improved. Meanwhile, the carrier part is compounded with alfalfa meal, monocalcium phosphate and other substances through acid-treated activated carbon, so that the adsorption capacity and stability of the additive are further enhanced; according to the preparation method provided by the invention, the active component and the carrier can be fully combined to form a uniformly distributed solid product, and the solid product is applied to a circulating water system, so that the flow velocity of water can be effectively increased.

Description

Technical Field

[0001] The invention belongs to the technical field of water additives and relates to an energy-saving circulating water additive and a preparation method thereof. Background Art

[0002] With the acceleration of industrialization and the increasing shortage of water resources, energy conservation and environmental protection have become important issues in the development of today's society. In the industrial production process, the application of circulating water systems is very extensive, but traditional circulating water systems generally have problems such as slow water flow rate and easy deterioration of water quality, which not only affects production efficiency, but also increases energy consumption and water treatment costs. Therefore, it is particularly important to develop a new additive that can effectively increase the flow rate of water, improve water quality, and improve the efficiency of circulating water systems.

[0003] At present, although there are some additives for circulating water systems on the market, most of these additives have single functions and insignificant effects. For example, some traditional scale inhibitors and corrosion inhibitors, although they can protect equipment and pipelines to a certain extent, have no obvious effect on increasing the flow rate of water. Some additives with flow rate increase function may have unsatisfactory effects due to unstable chemical properties and easy decomposition, and may even cause pollution to the environment.

[0004] In view of this, the present invention proposes a new type of energy-saving circulating water additive, which aims to achieve multiple functions such as increasing water flow rate, improving water quality, and improving the efficiency of the circulating water system by optimizing the components and preparation process of the additive. Summary of the invention

[0005] The purpose of the present invention is to provide an energy-saving circulating water additive and a preparation method thereof, which has the characteristics of improving water circulation efficiency.

[0006] The purpose of the present invention can be achieved through the following technical solutions: An energy-saving circulating water additive, the additive comprises a carrier and an active component, wherein the preparation method of the active component is as follows: S1.1: dissolving hexadecyltrimethylammonium bromide (CTAB) in an ethanol solution to prepare a CTAB solution with a mass fraction of 40-60%, which is referred to as solution I; S1.2: dissolving stigmasterol in ethanol solution to prepare a stigmasterol solution with a mass fraction of 20-30%, which is referred to as solution II; S1.3: Slowly drop solution II into solution I, stirring at a speed of 150 r / min while dropping, stirring for 0.5-1.5 h, heating to 40°C, increasing the speed to 180 r / min after constant temperature, adding 1 wt% silane coupling agent, and continuing stirring for 0.5 h to obtain a mixed solution III; S1.4: Place the mixed solution III in an evaporating dish and evaporate at 35°C until the solution is concentrated and crystals are precipitated, stirring continuously at a stirring rate of 100 r / min. Transfer the precipitated crystals to an oven and dry at about 60°C for 24 hours to obtain a solid product, which is the active component; The preparation method of the carrier is as follows: S2.1: Put the activated carbon into 1M sulfuric acid with a solid-liquid mass ratio of 1:2, heat it to 50-60℃ for reaction, and the reaction time is 3-4h. After the reaction is completed, wash it with deionized water until the pH is 7, use water vapor for heat treatment, and dry it at 80℃ for 12h to obtain acid-treated activated carbon; S2.2: alfalfa powder, calcium dihydrogen phosphate and acid-treated activated carbon were mixed in a mass ratio of 1:2:6, put into a ball mill and ground at a speed of 600 r / min for 1 h to obtain a mixture A; S2.3: Add 1 wt% citric acid to mixture A, adjust the rotation speed to 400 r / min, continue grinding for 0.5 h, and after grinding, transfer to 200 °C and roast for 2 h to obtain mixture B; S2.4: The mixture B is subjected to steam heat treatment again for 1 hour at a heat treatment temperature of 100° C., and then purged with 70° C. nitrogen to obtain a dry mixture, which is the carrier.

[0007] Furthermore, the water-to-alcohol volume ratio of the ethanol solution in S1.1 is 2:1.

[0008] Furthermore, the water-to-alcohol volume ratio of the ethanol solution in S1.2 is 2:1.

[0009] Furthermore, the rate of slow dripping in S1.3 is 3s / drop.

[0010] Furthermore, the silane coupling agent in S1.3 is one of silane coupling agent KH-560 and silane coupling agent KH-792.

[0011] Furthermore, the steam heat treatment parameters in S2.1 are as follows: the treatment time is 0.5~2h, and the heat treatment temperature is 800~950℃.

[0012] Furthermore, the purge flow rate of nitrogen in S2.4 is 20 m / s.

[0013] A method for preparing an energy-saving circulating water additive, the preparation process of the circulating water additive is as follows: S3.1: dissolving the active component in deionized water to obtain a solution with a mass fraction of 60%, immersing the carrier in the solution, with a solid-liquid mass ratio of the carrier to the solution of 1:2, and ultrasonicating for 0.5 h to obtain a solid-liquid mixture C; S3.2: Transfer the solid-liquid mixture C to liquid nitrogen and freeze it for 15-20 minutes, then dry it at -70 to -50 degrees Celsius under vacuum for 4-6 hours to obtain a solid product D; S3.3: The solid product D is subjected to hot pressing treatment, left to stand for 2 hours after the hot pressing treatment, and then crushed and ground using a ball mill to obtain the circulating water additive.

[0014] Furthermore, the hot pressing parameters in S3.3 are: temperature 60-70°C, applied force 10KN-15KN, and hot pressing time 120-300s.

[0015] Furthermore, the particle size of the circulating water additive obtained by grinding in S3.3 is 500 mesh.

[0016] The CTAB in the present invention was purchased from Shanghai Aidie Industrial Co., Ltd. with a purity of ≥99%; the stigmasterol in the present invention was purchased from Hubei Zhongshan Fengxing Pharmaceutical Technology Co., Ltd. with a purity of 95%; the alfalfa powder in the present invention was purchased from Sanyuan Tianyu Biological Products Co., Ltd. with a purity of 99%; the calcium dihydrogen phosphate in the present invention was purchased from Shanghai Yien Chemical Technology Co., Ltd. with a purity of 98%.

[0017] The present invention combines CTAB and stigmasterol and adds a silane coupling agent to improve the dispersibility and stability of the active component in water. At the same time, the carrier part is compounded with acid-treated activated carbon and alfalfa powder, calcium dihydrogen phosphate and other substances to further enhance the adsorption capacity and stability of the additive.

[0018] Through the preparation method provided by the present invention, the active component and the carrier can be fully combined to form a uniformly distributed solid product. The solid product is applied to a circulating water system to effectively increase the flow rate of water.

[0019] CTAB is a cationic surfactant whose molecule consists of a long-chain alkyl group and a quaternary ammonium salt. When CTAB is dissolved in water, the quaternary ammonium salt of the cationic part forms an electrostatic interaction with the oxygen atoms in the water molecules, while the long-chain alkyl part tends to stay away from the water molecules, forming a hydrophobic interaction. This molecular arrangement causes the electric field distribution around the water molecules to change, thereby affecting the hydrogen bond network between the water molecules.

[0020] As an alcohol compound, stigmasterol has a specific molecular structure and properties. During the modification process, the hydroxyl functional group of stigmasterol interacts with the CTAB molecule, thereby changing the hydrophilicity and hydrophobicity balance of the entire system. The adjustment of this balance helps the modified substance to interact with water molecules more effectively. The silane coupling agent has the characteristics of hydrolysis and cross-linking. During the modification process, the hydrolysis product of the silane coupling agent undergoes cross-linking reaction with the CTAB molecule, stigmasterol molecule and water molecule. This cross-linking reaction not only enhances the molecular structure stability of the modified substance, but also introduces new interaction modes and chemical bonding, further changing the interaction between water molecules.

[0021] Therefore, the modified CTAB molecules have a stronger balance of hydrophilicity and hydrophobicity, and can more effectively change the interaction force between water molecules. This change destroys the original hydrogen bond network of water molecules, weakens the interaction between water molecules, and thus improves the fluidity of water. The introduction of stigmasterol and silane coupling agent provides new interaction modes for water molecules. These new interaction modes compete with the original hydrogen bonds, thereby destroying or weakening the original hydrogen bonds. The hydrolysis products of silane coupling agent form new chemical bonds such as silicon-oxygen bonds with water molecules. These new chemical bonds change the interaction mode between water molecules and further destroy the original hydrogen bond network.

[0022] The synergistic effect of stigmasterol and silane coupling agent is not only reflected in their respective interactions with CTAB molecules, but also in the mutual reinforcement effect between them. This synergistic reinforcement effect makes the modified material show better performance in destroying the external hydrogen bonds of water, thereby improving the circulation efficiency of water. By destroying the external hydrogen bonds of water and introducing new interaction modes, the modified CTAB material can reduce the viscosity and surface tension of water, thereby improving the fluidity of water. This helps to reduce energy consumption and resistance in the circulating water system, improve the heat transfer performance and cleanliness of water, and thus improve the circulation efficiency of water.

[0023] After the activated carbon in the carrier of the present invention is treated with acid and heat-treated with water vapor, the surface properties are optimized and the adsorption capacity is significantly enhanced. The addition of alfalfa powder and calcium dihydrogen phosphate provides more active sites and functional groups for the carrier, further improving its adsorption performance.

[0024] By acid-treating activated carbon, the acidic functional groups on its surface can be increased, thereby improving its adsorption capacity for certain substances in water. At the same time, steam heat treatment and subsequent drying steps help remove impurities in activated carbon and further improve its adsorption performance. Mixing and grinding alfalfa meal, calcium dihydrogen phosphate and acid-treated activated carbon in a certain proportion can make the components fully dispersed and tightly combined to form a uniform mixture. This helps to improve the overall performance and stability of the carrier. The addition of citric acid can act as a chelating agent to help fix metal ions in water, thereby preventing the formation of scale. At the same time, it can also act as a dispersant to improve the dispersibility of the carrier in water. High-temperature roasting helps to remove volatiles and organic matter in the mixture and improve its thermal stability. The subsequent steam treatment can further activate the surface of the carrier and increase its adsorption and catalytic properties.

[0025] And a porous carrier can be obtained by calcination. The porous structure of this carrier helps to improve water flow performance and reduce water flow resistance. The functional groups and active sites on the surface of the carrier can interact with water molecules, thereby changing the surface tension and fluidity of water.

[0026] The active components in the additives can interact with the hydrogen bonds in water molecules. By changing the strength and stability of the hydrogen bonds, the active components can destroy or weaken the external hydrogen bond network of water, thereby reducing the viscosity and surface tension of water.

[0027] The carrier has a porous structure and abundant active sites, which can load more active components. In water, the carrier and the active components can act together on water molecules to further enhance the effect of destroying hydrogen bonds.

[0028] The preparation process ensures the dispersibility and solubility of the additives through steps such as ultrasound, freeze drying and hot pressing grinding, which allows the additives to contact and interact with water molecules more effectively, thereby destroying the external hydrogen bonds of water.

[0029] Beneficial effects of the present invention: The active components in the additive prepared by the present invention can interact with the hydrogen bonds in water molecules, and by changing the strength and stability of the hydrogen bonds, the external hydrogen bond network of water is destroyed or weakened, thereby reducing the viscosity and surface tension of water; the carrier prepared by the present invention has a porous structure and abundant active sites, and can load more active components. In water, the carrier and the active components can act on water molecules together, further enhancing the effect of destroying hydrogen bonds; in the preparation process of the present invention, the dispersibility and solubility of the additive are ensured through the steps of ultrasound, freeze drying and hot pressing grinding, so that the additive can contact and interact with water molecules more effectively, thereby destroying the external hydrogen bonds of water, improving the thermal conductivity of circulating water, and improving the circulation efficiency of the circulating water system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0031] Figure 1 A diagram of a heat exchange energy efficiency test device according to the present invention; Figure 2 Comparison chart of heat exchange energy efficiency test results of Example 1 of the present invention. DETAILED DESCRIPTION

[0032] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0033] Example 1 An energy-saving circulating water additive, the additive comprises a carrier and an active component, wherein the preparation method of the active component is as follows: S1.1: Dissolve hexadecyltrimethylammonium bromide (CTAB) in an ethanol solution with a water-to-alcohol volume ratio of 2:1 to obtain a CTAB solution with a mass fraction of 40%, which is referred to as solution I. S1.2: dissolving stigmasterol in an ethanol solution with a water-to-alcohol volume ratio of 2:1 to obtain a stigmasterol solution with a mass fraction of 20%, which is referred to as solution II; S1.3: Solution II was slowly added dropwise to solution I at a rate of 3s / drop, and the mixture was stirred at a speed of 150r / min. After stirring for 1h, the mixture was heated to 40°C, and the speed was increased to 180r / min after the temperature was kept constant. 1wt% of silane coupling agent KH-560 was added, and stirring was continued for 0.5h to obtain a mixed solution III. S1.4: Place the mixed solution III in an evaporating dish and evaporate at 35°C until the solution is concentrated and crystals are precipitated, stirring continuously at a stirring rate of 100 r / min. Transfer the precipitated crystals to an oven and dry at about 60°C for 24 hours to obtain a solid product, which is the active component; The preparation method of the carrier is as follows: S2.1: Put the activated carbon into 1M sulfuric acid with a solid-liquid mass ratio of 1:2, heat it to 50°C for reaction, the reaction time is 3 hours, wash it with deionized water until the pH is 7 after the reaction is completed, use water vapor for heat treatment, the treatment time is 1 hour, the heat treatment temperature is 900°C, and after heat treatment, dry it at 80°C for 12 hours to obtain acid-treated activated carbon; S2.2: alfalfa powder, calcium dihydrogen phosphate and acid-treated activated carbon were mixed in a mass ratio of 1:2:6, put into a ball mill and ground at a speed of 600 r / min for 1 h to obtain a mixture A; S2.3: Add 1 wt% citric acid to mixture A, adjust the rotation speed to 400 r / min, continue grinding for 0.5 h, and after grinding, transfer to 200 °C and roast for 2 h to obtain mixture B; S2.4: The mixture B is subjected to a steam heat treatment again for 1 hour at a heat treatment temperature of 100° C., and then purged with 70° C. nitrogen at a nitrogen purge flow rate of 20 m / s to obtain a dry mixture, which is the carrier; The preparation process of the circulating water additive is as follows: S3.1: dissolving the active component in deionized water to obtain a solution with a mass fraction of 60%, immersing the carrier in the solution, with a solid-liquid mass ratio of the carrier to the solution of 1:2, and ultrasonicating for 0.5 h to obtain a solid-liquid mixture C; S3.2: The solid-liquid mixture C was transferred to liquid nitrogen and frozen for 15 min, and then dried at -70 °C under vacuum for 4 h to obtain a solid product D; S3.3: The solid product D is subjected to hot pressing treatment, and the hot pressing parameters are: temperature 70°C, applied force 10KN, hot pressing time 300s, standing for 2h after hot pressing treatment, and then crushing and grinding with a ball mill to obtain the circulating water additive. The circulating water additive obtained by grinding has a particle size of 500 mesh.

[0034] Example 2 An energy-saving circulating water additive, the additive comprises a carrier and an active component, wherein the preparation method of the active component is as follows: S1.1: Dissolve hexadecyltrimethylammonium bromide (CTAB) in an ethanol solution with a water-to-alcohol volume ratio of 2:1 to obtain a CTAB solution with a mass fraction of 60%, which is referred to as solution I. S1.2: dissolving stigmasterol in an ethanol solution with a water-to-alcohol volume ratio of 2:1 to obtain a 30% stigmasterol solution, which is referred to as solution II. S1.3: Solution II was slowly added dropwise to solution I at a rate of 3s / drop, and the mixture was stirred at a speed of 150r / min. After stirring for 0.5h, the mixture was heated to 40°C, and the speed was increased to 180r / min after constant temperature. 1wt% of silane coupling agent KH-792 was added, and stirring was continued for 0.5h to obtain a mixed solution III. S1.4: Place the mixed solution III in an evaporating dish and evaporate at 35°C until the solution is concentrated and crystals are precipitated, stirring continuously at a stirring rate of 100 r / min. Transfer the precipitated crystals to an oven and dry at about 60°C for 24 hours to obtain a solid product, which is the active component; The preparation method of the carrier is as follows: S2.1: Put the activated carbon into 1M sulfuric acid with a solid-liquid mass ratio of 1:2, heat to 60°C for reaction, the reaction time is 4 hours, wash with deionized water to pH 7 after the reaction is completed, use water vapor for heat treatment, the treatment time is 2 hours, the heat treatment temperature is 800°C, and after heat treatment, dry at 80°C for 12 hours to obtain acid-treated activated carbon; S2.2: alfalfa powder, calcium dihydrogen phosphate and acid-treated activated carbon were mixed in a mass ratio of 1:2:6, put into a ball mill and ground at a speed of 600 r / min for 1 h to obtain a mixture A; S2.3: Add 1 wt% citric acid to mixture A, adjust the rotation speed to 400 r / min, continue grinding for 0.5 h, and after grinding, transfer to 200 °C and roast for 2 h to obtain mixture B; S2.4: The mixture B is subjected to a steam heat treatment again for 1 hour at a heat treatment temperature of 100° C., and then purged with 70° C. nitrogen at a nitrogen purge flow rate of 20 m / s to obtain a dry mixture, which is the carrier; The preparation process of the circulating water additive is as follows: S3.1: dissolving the active component in deionized water to obtain a solution with a mass fraction of 60%, immersing the carrier in the solution, with a solid-liquid mass ratio of the carrier to the solution of 1:2, and ultrasonicating for 0.5 h to obtain a solid-liquid mixture C; S3.2: The solid-liquid mixture C was transferred to liquid nitrogen and frozen for 20 min, and then dried at -50 °C under vacuum for 6 h to obtain a solid product D; S3.3: The solid product D is subjected to hot pressing treatment, and the hot pressing parameters are: temperature 60°C, applied force 15KN, hot pressing time 120s, standing for 2h after hot pressing treatment, and then crushing and grinding with a ball mill to obtain the circulating water additive. The circulating water additive obtained by grinding has a particle size of 500 mesh.

[0035] Example 3 An energy-saving circulating water additive, the additive comprises a carrier and an active component, wherein the preparation method of the active component is as follows: S1.1: Dissolve hexadecyltrimethylammonium bromide (CTAB) in an ethanol solution with a water-to-alcohol volume ratio of 2:1 to obtain a CTAB solution with a mass fraction of 40%, which is referred to as solution I. S1.2: dissolving stigmasterol in an ethanol solution with a water-to-alcohol volume ratio of 2:1 to obtain a stigmasterol solution with a mass fraction of 20%, which is referred to as solution II; S1.3: Solution II was slowly added dropwise to solution I at a rate of 3s / drop, and the mixture was stirred at a speed of 150r / min. After stirring for 1.5h, the mixture was heated to 40°C, and the speed was increased to 180r / min after constant temperature. 1wt% of silane coupling agent KH-560 was added, and stirring was continued for 0.5h to obtain a mixed solution III. S1.4: Place the mixed solution III in an evaporating dish and evaporate at 35°C until the solution is concentrated and crystals are precipitated, stirring continuously at a stirring rate of 100 r / min. Transfer the precipitated crystals to an oven and dry at about 60°C for 24 hours to obtain a solid product, which is the active component; The preparation method of the carrier is as follows: S2.1: Put the activated carbon into 1M sulfuric acid with a solid-liquid mass ratio of 1:2, heat to 60°C for reaction, the reaction time is 4 hours, wash with deionized water to pH 7 after the reaction is completed, use water vapor for heat treatment, the treatment time is 2 hours, the heat treatment temperature is 950°C, and after heat treatment, dry at 80°C for 12 hours to obtain acid-treated activated carbon; S2.2: alfalfa powder, calcium dihydrogen phosphate and acid-treated activated carbon were mixed in a mass ratio of 1:2:6, put into a ball mill and ground at a speed of 600 r / min for 1 h to obtain a mixture A; S2.3: Add 1 wt% citric acid to mixture A, adjust the rotation speed to 400 r / min, continue grinding for 0.5 h, and after grinding, transfer to 200 °C and roast for 2 h to obtain mixture B; S2.4: The mixture B is subjected to a steam heat treatment again for 1 hour at a heat treatment temperature of 100° C., and then purged with 70° C. nitrogen at a nitrogen purge flow rate of 20 m / s to obtain a dry mixture, which is the carrier; The preparation process of the circulating water additive is as follows: S3.1: dissolving the active component in deionized water to obtain a solution with a mass fraction of 60%, immersing the carrier in the solution, with a solid-liquid mass ratio of the carrier to the solution of 1:2, and ultrasonicating for 0.5 h to obtain a solid-liquid mixture C; S3.2: The solid-liquid mixture C was transferred to liquid nitrogen and frozen for 15 min, and then dried at -50 °C under vacuum for 6 h to obtain a solid product D; S3.3: The solid product D is subjected to hot pressing treatment, and the hot pressing parameters are: temperature 60°C, applied force 15KN, hot pressing time 120s, standing for 2h after hot pressing treatment, and then crushing and grinding with a ball mill to obtain the circulating water additive. The circulating water additive obtained by grinding has a particle size of 500 mesh.

[0036] Comparative Example 1 In this comparative example, no stigmasterol was added during the preparation of the active component, and the remaining steps were consistent with those of Example 1.

[0037] Comparative Example 2 In this comparative example, no silane coupling agent was added during the preparation of the active component, and the remaining steps were consistent with those of Example 1.

[0038] Comparative Example 3 In this comparative example, no alfalfa powder was added during the carrier preparation process, and the remaining steps were consistent with Example 1.

[0039] Comparative Example 4 In this comparative example, no calcium dihydrogen phosphate was added during the carrier preparation process, and the remaining steps were consistent with Example 1.

[0040] Comparative Example 5 In this comparative example, no hot pressing treatment is performed during the preparation of the circulating water additive, and the remaining steps are consistent with those of Example 1.

[0041] The heat exchange energy efficiency test was carried out by selecting Example 1 prepared by the present invention. Experimental setup Figure 1 As shown, 1) Two copper cups, A and B, and two sets of macro cameras with timelines to record the actual freezing conditions; 2) The radiator has 12 capillary heat pipes with a length of 18 cm; 3) Lift 10 meters, 6w power, brushless motor water pump; 4) 84W DC 55*21 power supply; 5) 45w semiconductor cooling chip with temperature control.

[0042] Experimental principle: 1. The semiconductor refrigeration chip is powered on to generate heat energy, and the circulating water continuously takes away the heat energy. The refrigeration chip continuously cools down, causing the water in the copper cup to freeze. The heat energy in the circulating water is transferred to the fins (300 pieces) through the capillary pipes of the radiator device, and then discharged into the air through the 5W fan.

[0043] 2. Water is the heat energy carrier of the entire system. Adding additives can improve the circulation efficiency of water, change the thermal conductivity of water, improve thermal efficiency, shorten the freezing time, and reduce power consumption.

[0044] 3. When water freezes in a regular cylinder, due to the existence of external forces and van der Waals forces, peaks will appear when it is completely frozen.

[0045] 4. At the same temperature, the energy required to completely freeze 100 ml of water is the same, with the additive as the only variable, and the time ratio is the energy efficiency ratio.

[0046] The temperature was constant at 19°C, the amount of distilled water was 100 ml, the additive prepared in Example 1 of the present invention was added to the distilled water in copper cup A, the amount of addition was 1‰, and only distilled water was added to copper cup B. The complete freezing time was recorded. The experimental results are summarized in the following table:

[0047] The experimental data show that the copper cup A with additives freezes faster. Figure 2 It can be seen that under the same period of time, the ice in copper cup A is thicker, so the addition of additives effectively improves the thermal conductivity of water and the circulation efficiency of the circulating water system.

[0048] The embodiments and comparative examples were further tested, and the experimental data were sorted into the following table:

[0049] Experimental data show that adding stigmasterol and silane coupling agent in the preparation of active components, adding alfalfa powder and calcium dihydrogen phosphate in the preparation of carriers, and hot pressing in the preparation of additives can effectively improve the performance of additives.

[0050] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An energy-saving circulating water additive, characterized in that: The additive comprises a carrier and an active component, wherein the preparation method of the active component is as follows: S1.1: Dissolve hexadecyltrimethylammonium bromide (CTAB) in an ethanol solution to prepare a CTAB solution with a mass fraction of 40-60%, which is referred to as solution I. S1.2: dissolving stigmasterol in ethanol solution to prepare a stigmasterol solution with a mass fraction of 20-30%, which is referred to as solution II; S1.3: Slowly drop solution II into solution I, stirring at a speed of 150 r / min while dropping, stirring for 0.5-1.5 h, heating to 40°C, increasing the speed to 180 r / min after constant temperature, adding 1 wt% silane coupling agent, and continuing stirring for 0.5 h to obtain a mixed solution III; S1.4: Place the mixed solution III in an evaporating dish and evaporate at 35°C until the solution is concentrated and crystals are precipitated, stirring continuously at a stirring rate of 100 r / min. Transfer the precipitated crystals to an oven and dry at about 60°C for 24 hours to obtain a solid product, which is the active component; The preparation method of the carrier is as follows: S2.1: Put the activated carbon into 1M sulfuric acid with a solid-liquid mass ratio of 1:2, heat it to 50-60℃ for reaction, and the reaction time is 3-4h. After the reaction is completed, wash it with deionized water until the pH is 7, use water vapor for heat treatment, and dry it at 80℃ for 12h to obtain acid-treated activated carbon; S2.2: alfalfa powder, calcium dihydrogen phosphate and acid-treated activated carbon were mixed in a mass ratio of 1:2:6, put into a ball mill and ground at a speed of 600 r / min for 1 h to obtain a mixture A; S2.3: Add 1 wt% citric acid to mixture A, adjust the rotation speed to 400 r / min, continue grinding for 0.5 h, and after grinding, transfer to 200 °C and roast for 2 h to obtain mixture B; S2.4: The mixture B is subjected to steam heat treatment again for 1 hour at a heat treatment temperature of 100° C., and then purged with 70° C. nitrogen to obtain a dry mixture, which is the carrier.

2. The energy-saving circulating water additive according to claim 1, characterized in that: The water-to-alcohol volume ratio of the ethanol solution in S1.1 is 2:

1.

3. The energy-saving circulating water additive according to claim 1, characterized in that: The water-to-alcohol volume ratio of the ethanol solution in S1.2 is 2:

1.

4. The energy-saving circulating water additive according to claim 1, characterized in that: The rate of slow dripping in S1.3 is 3s / drop.

5. The energy-saving circulating water additive according to claim 1, characterized in that: The silane coupling agent in S1.3 is one of silane coupling agent KH-560 and silane coupling agent KH-792.

6. The energy-saving circulating water additive according to claim 1, characterized in that: The steam heat treatment parameters in S2.1 are as follows: the treatment time is 0.5~2h and the heat treatment temperature is 800~950℃.

7. The energy-saving circulating water additive according to claim 1, characterized in that: The purge flow rate of nitrogen in S2.4 is 20 m / s.

8. A method for preparing an energy-saving circulating water additive, based on an energy-saving circulating water additive according to any one of claims 1 to 7, characterized in that: The preparation process of the circulating water additive is as follows: S3.1: dissolving the active component in deionized water to obtain a solution with a mass fraction of 60%, immersing the carrier in the solution, with a solid-liquid mass ratio of the carrier to the solution of 1:2, and ultrasonicating for 0.5 h to obtain a solid-liquid mixture C; S3.2: Transfer the solid-liquid mixture C to liquid nitrogen and freeze it for 15-20 minutes, then dry it at -70 to -50 degrees Celsius under vacuum for 4-6 hours to obtain a solid product D; S3.3: The solid product D is subjected to hot pressing treatment, left to stand for 2 hours after the hot pressing treatment, and then crushed and ground using a ball mill to obtain the circulating water additive.

9. The method for preparing an energy-saving circulating water additive according to claim 8, characterized in that: The hot pressing parameters in S3.3 are: temperature 60~70°C, applied force 10KN~15KN, and hot pressing time 120~300s.

10. The method for preparing an energy-saving circulating water additive according to claim 8, characterized in that: The particle size of the circulating water additive obtained by grinding in S3.3 is 500 mesh.

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