A method for resource utilization of brewing pot water and application of recycled materials

Abstract

The present invention discloses a method for resource utilization of brewery bottom pot water and the application of its recycled materials. The method comprises the following steps: (1) removing suspended matter from the brewery bottom pot water by static filtration, then vacuum distilling to dryness to obtain organic matter A, and separating the distilled water into primary water and tail water. The primary water is reused as a cocktail liquid, and the tail water is recycled or directly discharged; (2) extracting the organic matter A obtained in step (1) with anhydrous ethanol, filtering, and washing to obtain an ethanol extract and crude polysaccharides, vacuum distilling the ethanol extract to recover ethanol to obtain organic matter B; and removing monosaccharides from the crude polysaccharides with 80% ethanol to obtain organic matter C. The organic matter A and organic matter B can act as metal corrosion inhibitors when steel is in an acidic solution environment, and the organic matter C acts as an antioxidant in scavenging free radicals. The present invention can separate the corrosion inhibitor and antioxidant from the brewery bottom pot water and recover water, thereby achieving resource utilization and near-zero discharge of the brewery bottom pot water.

Description

Technical Field

[0001] The invention belongs to the technical field of wine-making bottom pot water treatment, and in particular relates to a method for resource utilization of wine-making bottom pot water and application of its recycled products. Background Art

[0002] Baijiu (Chinese liquor) is made from starchy or sugary plant materials. Under the influence of fermentation agents, the distilled liquor undergoes a series of processes, including raw material crushing, fermentation, distillation, storage, and blending. Distillery wastewater refers to industrial wastewater generated throughout the production, storage, and aging of baijiu. It is generally categorized as high-concentration organic wastewater and low-concentration organic wastewater. Low-concentration organic wastewater includes cooling water, bottle washing water, and site flushing water. It has low pollutant concentrations and can be recycled or directly discharged. High-concentration organic wastewater, such as boiler water, yellow water, and grain soaking water, is rich in organic compounds such as starch, reducing sugars, organic acids, esters, and alcohols, and is a major cause of pollution. According to incomplete statistics, every ton of baijiu produced generates 12 to 20 tons of wastewater. This wastewater, characterized by high organic matter concentrations, numerous suspended particles, and high biodegradability, is a typical example of high-concentration organic wastewater. Discharge into rivers can cause severe eutrophication and lead to red tides. Sichuan, in particular, is a critical ecological barrier and water conservation area in the upper reaches of the Yangtze River. Yibin is committed to building itself into a premier ecological city along the Yangtze River.

[0003] With the development and improvement of water treatment technology, large-scale liquor companies in my country all have their own unique wastewater treatment projects. Although the treated water quality meets national emission standards, the high content of natural organic matter in brewing wastewaters such as yellow water and bottom pot water has extremely high reuse value. However, the liquor industry's current wastewater treatment is mainly based on meeting emission standards. The utilization rate of organic resources in the wastewater is low, which not only wastes resources but also poses a potential environmental hazard due to the greenhouse gases and solid waste sludge generated during the water treatment process. With the further tightening of national environmental protection policies and the continuous expansion of the liquor industry, the model of treating brewing byproducts separately and individually is no longer suitable for the development needs of modern enterprises. It is necessary to explore a comprehensive chain-based utilization of the three wastes from the source to create a circular economy production chain for liquor.

[0004] Brewery bottom water is a liquid formed when water vapor repeatedly condenses in the mash during grain gelatinization and mash distillation, sinks, accumulates, and mixes with the existing water at the bottom of the pot. Because it serves as the steam medium in the mash distillation process, it continuously dissolves and leaches organic components from the mash, making it a typical high-concentration organic wastewater. To increase wine yield, yellow water is added to the pot during the brewing process, resulting in a yellowish-brown or brown bottom water. Bottom water is a major source of brewery wastewater, containing a large amount of organic matter. Direct discharge of this water not only causes serious environmental pollution but also wastes resources due to the inefficient utilization of the organic components in the bottom water. Furthermore, with the increasing scarcity of freshwater and energy resources, exploring technologies for the treatment and resource utilization of high-concentration organic wastewater has become a hot topic in environmental protection. Wastewater resource utilization and the extraction of other resources and energy from wastewater are crucial for optimizing water supply, increasing water availability, alleviating supply-demand imbalances, reducing water pollution, and ensuring aquatic ecological security. Therefore, realizing the resource utilization of brewing bottom pot water and researching near-zero emission technology will not only help reduce resource waste, but also reduce the pollution to the environment caused by the emission process, which is of great practical significance for maintaining sustainable development. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for resource utilization of brewing bottom boiler water and the application of its recycled products. The present invention can separate corrosion inhibitors and antioxidants from brewing bottom boiler water and recycle water, thereby realizing resource utilization and near-zero emissions of brewing bottom boiler water.

[0006] The technical solution of the present invention is achieved as follows:

[0007] A method for resource utilization of brewing pot water, comprising the following steps:

[0008] (1) Standing and filtering to remove suspended matter in the brewing pot water, then vacuum distilling to dryness to obtain organic matter A, and distilling the water into primary water and tail water, the primary water is reused as a cocktail, and the tail water is recycled or directly discharged;

[0009] (2) The organic matter A obtained in step (1) is extracted with anhydrous ethanol, filtered and washed to obtain an ethanol extract and crude polysaccharide, and the ethanol extract is subjected to reduced pressure distillation to recover ethanol to obtain organic matter B; the crude polysaccharide is removed from monosaccharides with 80% ethanol to obtain organic matter C.

[0010] Furthermore, in step (2), the organic matter A is subjected to multiple ultrasonic extractions using anhydrous ethanol, and during each extraction, the mass volume ratio of the organic matter A to anhydrous ethanol is 1 g:10-30 mL.

[0011] The organic compound A is used as a metal corrosion inhibitor in an acidic solution environment for steel. The acidic solution is an aqueous solution of concentrated sulfuric acid, hydrochloric acid, or nitric acid, the concentration of the acidic solution is 0.1 to 6 mol / L, and the amount of the metal corrosion inhibitor added is 0.05 to 1.0 g / L.

[0012] The organic compound B is used as a metal corrosion inhibitor in an acidic solution environment for steel. The acidic solution is an aqueous solution of concentrated sulfuric acid, hydrochloric acid, or nitric acid, the concentration of the acidic solution is 0.1 to 6 mol / L, and the amount of the metal corrosion inhibitor added is 0.05 to 1.0 g / L.

[0013] Furthermore, the metal corrosion inhibitor further contains potassium iodide, and the amount of potassium iodide added to the metal corrosion inhibitor is 0.0005-0.005 mol / L.

[0014] The organic compound C is used as an antioxidant in scavenging free radicals. The free radical is ·OH, and the amount of the antioxidant added is 0.5-1.0 g / L.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention uses brewing water as raw material, and through the steps of filtering, removing impurities and vacuum distillation, organic matter from the brewing water can be obtained, which can be used as a corrosion inhibitor. The usage amount of the corrosion inhibitor is low, the corrosion inhibition effect is good, and the corrosion inhibition efficiency can reach 94.7%. After the carbon steel is corroded in a strong acid medium with the corrosion inhibitor added, the surface of the sample is relatively smooth. The initial distilled water can be used as a cocktail liquid, and the remaining distilled water can be reused or simply treated and discharged in compliance with the standards. The entire process does not generate waste liquid, realizing the resource utilization of brewing water and near-zero emissions.

[0017] At the same time, the organic matter in the brewing bottom water can be used to separate the crude polysaccharides with anhydrous ethanol to develop antioxidants, and the organic residues in the brewing bottom water after removing the polysaccharides can be used as corrosion inhibitors. After compounding, its corrosion inhibition performance is significantly improved, which has practical application value.

[0018] 2. This invention realizes the resource utilization of brewery bottom water, generates high added value, avoids environmental pollution and resource waste, and realizes a process approach of turning waste into treasure. It also proposes for the first time the preparation of pickling corrosion inhibitor based on brewery bottom water, providing new ideas and new options for the preparation of corrosion inhibitors. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 -Flowchart of resource utilization of brewing bottom pot water of the present invention.

[0020] Figure 2 -Infrared spectrum of corrosion inhibitor 1.

[0021] Figure 3 -Elemental analysis of corrosion inhibitor 1.

[0022] Figure 4 -Polarization curves of carbon steel electrode in 0.5 mol / L H2SO4 containing different concentrations of corrosion inhibitor 1 at different temperatures.

[0023] Figure 5-3 SEM images of carbon steel in 0.5 mol / L H2SO4 without corrosion inhibitor and with 1.0 g / L corrosion inhibitor 1 at 0°C.

[0024] Figure 6 -Polarization curves of carbon steel electrodes in 1.0 mol / L HCl containing different concentrations of corrosion inhibitors at different temperatures.

[0025] Figure 7-3 SEM images of carbon steel in 1.0 mol / L HCl at 0°C without corrosion inhibitor and with 1.0 g / L corrosion inhibitor 1.

[0026] Figure 8-3 Electrochemical impedance spectroscopy of a carbon steel electrode in 0.5 mol / L H2SO4 containing different concentrations of inhibitor 2 at 0℃.

[0027] Figure 9-3 Electrochemical impedance spectroscopy of a carbon steel electrode in 0.5 mol / L H2SO4 containing different concentrations of corrosion inhibitor 2 + 0.001 mol / L KI at 0℃.

[0028] Figure 10 -Scavenging rate of ·OH by crude polysaccharide antioxidants at different concentrations. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] 1. A method for resource utilization of brewing bottom pot water, the flow chart of which is as follows Figure 1 As shown, the specific steps include:

[0031] 1) The brewing pot water sample is allowed to stand until large particles of insoluble matter such as husks, wheat bran, and broken grain particles in the water have naturally settled. The filtrate is then filtered and distilled under reduced pressure. The distilled water within the first 30 minutes is collected and recorded as the initial water. The distillation is continued until there are no water droplets on the wall of the condensation reflux pipe. The distillation is then stopped and dried at below 50°C. The reddish-brown viscous liquid substance remaining in the distillation flask after drying is recorded as the brewing pot water organic matter, thus obtaining the corrosion inhibitor 1 and the distilled tail water. The distilled tail water is recycled or discharged in compliance with the standards.

[0032] 2) Take 10g of organic matter from the bottom pot water of brewing wine, add 100mL of anhydrous ethanol, and ultrasonically extract for 20min, repeat twice, and the insoluble matter obtained is crude sugar. The crude sugar is then washed with 80% ethanol to remove small molecular sugars, and then dried at low temperature after washing. The obtained khaki granular solid is crude polysaccharide, that is, the antioxidant is obtained. The anhydrous ethanol used to extract the bottom pot water organic matter is distilled under reduced pressure to obtain the bottom pot water organic matter residue after extracting the crude polysaccharide, that is, the corrosion inhibitor 2.

[0033] 3) The prepared corrosion inhibitor was compounded with potassium iodide to obtain the corrosion inhibitor 3. It was found that the corrosion inhibition performance of the compounded corrosion inhibitor was significantly improved.

[0034] During the entire process, water is recycled and ethanol is reused, and no new waste liquid is generated, thus achieving resource utilization and zero-emission treatment of the brewing bottom pot water.

[0035] 1. The organic matter in the brewing pot water (corrosion inhibitor 1) was tested by infrared spectrum. The results are as follows: Figure 2 shown.

[0036] from Figure 2 It can be found that the wave number is 3386cm -1 There is a strong absorption broad peak at 2935 cm, which is the stretching vibration peak of NH and OH bonds. -1 The peak is the stretching vibration peak of CH, 1721cm -1 The corresponding peak is the stretching vibration peak of C=O, 1606 cm -1 is the stretching vibration peak of C=C double bond, 1410 cm -1 is the stretching vibration peak of N=N, 1041cm -1 Indicates the stretching vibration peak of CO. The results of infrared spectroscopy show that the organic matter in the bottom pot water of brewing (corrosion inhibitor 1) contains functional groups such as hydroxyl, carbonyl, and amino groups, as well as unsaturated structures such as double bonds, and thus has the potential to be used as a corrosion inhibitor.

[0037] 2. The organic matter in the brewing pot water (corrosion inhibitor 1) was subjected to elemental analysis and the results were as follows: Figure 3 shown.

[0038] from Figure 3It can be found that the organic matter in the brewery bottom water (corrosion inhibitor 1) is mainly composed of elements such as O, C, H, and N. The O content is as high as 50.10%, indicating that the organic matter in the brewery bottom water (corrosion inhibitor 1) is an oxygen-rich compound, which is related to its high content of sugar substances. The carbon element is second only to 37.98%, and the nitrogen content is also as high as 2.92%. In addition, there is a small amount of S element, indicating that the compound (corrosion inhibitor 1) also contains organic compounds containing N and S. The presence of heteroatoms such as O, N, and S can serve as active reaction sites for the organic matter in the brewery bottom water (corrosion inhibitor 1), interacting with the metal surface, thus giving it potential good corrosion inhibition performance.

[0039] 3. Gas chromatography-mass spectrometry analysis of the first-stage water revealed that its primary components are ethyl lactate, acetic acid, butyric acid, and caproic acid. These substances contribute to the richness and fullness of baijiu. Therefore, the first-stage water evaporated from the bottom pot has the potential to serve as a flavoring agent for baijiu.

[0040] 2. Study on the performance of corrosion inhibitors.

[0041] 1. At different temperatures (30℃, 40℃ and 50℃), a carbon steel electrode was placed in a 0.5mol / LH2SO4 solution and different concentrations of corrosion inhibitor 1 were added to obtain the potentiodynamic polarization curves, as shown in the following figure: Figure 4 shown.

[0042] from Figure 4 It can be seen that the shape of the polarization curve did not change significantly with the addition of organic matter in the bottom pot water (corrosion inhibitor 1), which means that the addition of corrosion inhibitor 1 did not change the reaction mechanism of carbon steel in 0.5M H2SO4 solution, indicating that corrosion inhibitor 1 mainly played a role in corrosion inhibition through adsorption. Figure 4 It can be seen that after adding corrosion inhibitor 1, the anodic branches of the polarization curves almost overlap, indicating that corrosion inhibitor 1 has little or no effect on the anodic dissolution of carbon steel in 0.5M H2SO4 solution. On the contrary, the current density of the cathodic branch is significantly reduced, indicating that corrosion inhibitor 1 mainly inhibits the cathodic hydrogen evolution reaction of carbon steel in H2SO4 solution.

[0043] right Figure 4 The corrosion electrochemical parameters obtained by extrapolating the polarization curve using the Tafel linear segment are shown in Table 1. The calculation formula for the corrosion inhibition efficiency (η) is shown in Formula (1-1).

[0044] η=(1-i corr,inh / i corr,0 )×100% (1-1)

[0045] Where: i corr,inh and i corr,0are the corrosion current densities of carbon steel electrodes in the solution with corrosion inhibitor added and in the blank solution, respectively.

[0046] Table 1 Electrochemical parameters of carbon steel electrode in 0.5 mol / L H2SO4 containing different concentrations of corrosion inhibitor 1

[0047]

[0048] It can be seen from Table 1 that the corrosion potential E corr The value of E shifted negatively with the increase of the concentration of corrosion inhibitor 1, indicating that corrosion inhibitor 1 had a more significant effect on the cathode reaction. However, compared with the blank solution, corr The change is less than 85mV, but according to Figure 4 It can be found that the corrosion inhibitor 1 has no obvious inhibitory effect on the anodic reaction of carbon steel electrode in 0.5M H2SO4 solution. Therefore, it can be considered that the corrosion inhibitor 1 is a "moderate" or "modest" cathodic corrosion inhibitor. With the increase of the concentration of corrosion inhibitor 1, the corrosion current density i corr The value of decreases, indicating that the inhibitory effect of corrosion inhibitor 1 on carbon steel corrosion is enhanced, and the corresponding corrosion inhibition efficiency is increasing. corrr The increase in , indicating that the acid solution's corrosion of carbon steel has increased. Although the corrosion inhibition efficiency of Inhibitor 1 decreases with increasing temperature, the corrosion inhibition efficiency at 1.0 g / L remains above 90%. At 30°C, the corrosion inhibition efficiency reaches a maximum of 94.7%, indicating that Inhibitor 1 has a good corrosion inhibition effect on carbon steel in H2SO4 solution.

[0049] 2. Weight loss experiment and surface morphology analysis of carbon steel in 0.5 mol / L H2SO4 solution

[0050] At 30°C, the corrosion rates of carbon steel in 0.5 mol / L H2SO4 without adding corrosion inhibitor (control group) and adding 1.0 g / L corrosion inhibitor 1 (experimental group) were determined by weight loss method. The results were 0.4538 g·m -2 ·h -1 and 0.0539 g·m -2 ·h -1 The corrosion inhibition efficiency of the corrosion inhibitor was calculated to be 88.13%. After the experiment, the corrosion morphology of the sample surface was tested using a scanning electron microscope (SEM). The results are as follows: Figure 5 As shown, Figure 5 (a) is the control group, Figure 5 (b) is the experimental group. As can be seen from the figure, the carbon steel surface in the control group was severely corroded, while the carbon steel sample in the experimental group was slightly corroded, with a relatively smooth surface and few corrosion pits. This shows that the addition of corrosion inhibitor 1 has a good inhibitory effect on the corrosion of carbon steel in 0.5M H2SO4 solution.

[0051] 3. At different temperatures (30℃, 40℃ and 50℃), the carbon steel electrode was placed in 1mol / LHCl solution and different concentrations of corrosion inhibitor 1 were added to obtain the potentiodynamic polarization curves, as shown in the following figure: Figure 6 shown.

[0052] from Figure 6 It can be seen that the shape of the polarization curve did not change significantly with the addition of corrosion inhibitor 1, indicating that the addition of organic matter in the bottom pot water did not change the reaction mechanism of carbon steel in 1M HCl solution, indicating that the organic matter in the bottom pot water mainly prevented the corrosion of carbon steel by adsorbing on the active sites on the carbon steel surface. Figure 6 As can be seen in the figure, the addition of organic matter to the bottom pot water shifts both the cathode and anode branches of the polarization curve toward lower current densities, indicating that Inhibitor 1 can simultaneously inhibit both the anodic dissolution of carbon steel and the evolution of hydrogen at the cathode. However, the current density at the cathode branch decreases more significantly than at the anode, indicating that Inhibitor 1 is a mixed inhibitor primarily focused on inhibiting the cathode reaction.

[0053] right Figure 6 The corrosion electrochemical parameters obtained by extrapolating the polarization curves using the Tafel linear segment are shown in Table 2.

[0054] It can be seen from Table 2 that the corrosion potential E corr The value of is generally negatively shifted with the increase of the concentration of organic matter in the bottom pot water, indicating that the effect of organic matter in the bottom pot water on the cathode reaction is more obvious. At the same time, it can also be found that with the increase of the concentration of organic matter added to the bottom pot water, the corrosion current density i corr The value of decreases, indicating that the adsorption of corrosion inhibitor 1 on the carbon steel surface inhibits the corrosion of carbon steel, and the corresponding corrosion inhibition efficiency also increases. corr The value of increases, indicating that the acid solution's corrosion of carbon steel increases. However, the corrosion inhibition efficiency of Inhibitor 1 does not change significantly with increasing temperature. In fact, the inhibition efficiency increases slightly at concentrations of 0.3 g / L and above. At 50°C, the inhibition efficiency reaches a maximum of 86.4%, indicating that Inhibitor 1 has a good inhibitory effect on the corrosion of carbon steel in 1M HCl solution.

[0055] Table 2 Electrochemical parameters of carbon steel electrode in 1.0 mol / L HCl containing different concentrations of inhibitor 1

[0056]

[0057] 4. Weight loss experiment and surface morphology analysis of carbon steel in 1.0 mol / L HCl solution

[0058] At 30°C, the corrosion rates of carbon steel in 1.0 mol / L HCl without adding corrosion inhibitor (control group) and adding 1.0 g / L corrosion inhibitor 1 (experimental group) were determined by weight loss method. The results were 0.2515 g·m -2 ·h -1 and 0.0250 g·m -2 ·h -1 The corrosion inhibition efficiency of the corrosion inhibitor was calculated to be 90.07%. After the experiment, the corrosion morphology of the sample surface was tested using a scanning electron microscope (SEM). The results are as follows: Figure 7 As shown, Figure 7 (a) is the control group, Figure 7 (b) is the experimental group. As can be seen from the figure, the carbon steel surface in the control group was severely corroded, while the carbon steel samples in the experimental group were slightly corroded, with relatively smooth surfaces and few cracks. This indicates that the organic matter in the bottom water has a good inhibitory effect on the corrosion of carbon steel in 1M HCl solution.

[0059] 5. At 30°C, place the carbon steel electrode in a 0.5 mol / L H2SO4 solution and add different concentrations of corrosion inhibitor 2 to obtain the electrochemical impedance spectrum, such as Figure 8 shown.

[0060] from Figure 8 It can be seen that the addition of organic matter residues in the bottom pot water after the extraction of crude polysaccharides (corrosion inhibitor 2) significantly changes the shape of the electrochemical impedance spectrum of carbon steel in 0.5M H2SO4 solution. Therefore, the effect on its reaction mechanism is also small, indicating that corrosion inhibitor 2 mainly plays a role in corrosion inhibition through adsorption. Figure 8 It can be seen that after adding corrosion inhibitor 2, the diameter of the electrochemical impedance spectrum increases significantly, so it has a significant inhibitory effect on the corrosion of carbon steel in 0.5M H2SO4 solution.

[0061] Further, Figure 8 The electrochemical impedance parameters are shown in Table 3, and the calculation formula of the corrosion inhibition efficiency (η) is shown in Formula (1-2).

[0062] η=(1-R p,0 / R p,inh )×100% (1-2)

[0063] Where: R p,inh and R p,0 are the polarization resistance of the carbon steel electrode in the solution with corrosion inhibitor added and in the blank solution, respectively.

[0064] Table 3 Electrochemical impedance spectroscopy parameters of carbon steel electrodes in 0.5 mol / L H2SO4 containing different concentrations of inhibitor 2 at 30 °C

[0065]

[0066] It can be seen from Table 3 that as the concentration of corrosion inhibitor 2 increases, the polarization resistance R p The increase in the value of indicates that Inhibitor 2 increases the corrosion resistance of carbon steel in 0.5M H2SO4 solution, that is, its corrosion is suppressed, and the corresponding corrosion inhibition efficiency is increasing. At 30°C, the corrosion inhibition efficiency reaches a maximum of 86.02%, indicating that Inhibitor 2 has a good corrosion inhibition effect on carbon steel in H2SO4 solution.

[0067] 6. At 30°C, a carbon steel electrode was placed in a 0.5 mol / L H2SO4 solution. Based on the compounding strategy, a compound corrosion inhibitor (corrosion inhibitor 3) consisting of different concentrations of corrosion inhibitor 2 and 0.001 mol / LKI was added to obtain the electrochemical impedance spectrum, as shown in the following example: Figure 9 shown.

[0068] from Figure 9 It can be seen that the addition of the compound corrosion inhibitor significantly changes the shape of the electrochemical impedance spectrum of carbon steel in 0.5M H2SO4 solution. Therefore, the effect on its reaction mechanism is also small, indicating that the compound corrosion inhibitor mainly plays a role in corrosion inhibition through adsorption. Figure 9 It can be seen that after adding corrosion inhibitor 3, the diameter of the electrochemical impedance spectrum increases significantly, so it has a significant inhibitory effect on the corrosion of carbon steel in 0.5M H2SO4 solution.

[0069] Further, Figure 9 The electrochemical impedance spectroscopy parameters are shown in Table 4.

[0070] Table 4 Electrochemical impedance spectroscopy parameters of carbon steel electrodes in 0.5 mol / L H2SO4 containing different concentrations of inhibitor 3 at 30 °C

[0071]

[0072] It can be seen from Table 4 that as the concentration of corrosion inhibitor 3 increases, the polarization resistance R p The increase in the value of indicates that Inhibitor 3's inhibitory effect on carbon steel corrosion in 0.5M H2SO4 solution is enhanced, and the corresponding corrosion inhibition efficiency is increasing. At 30°C, the corrosion inhibition efficiency reaches a maximum of 97.51%, indicating that Inhibitor 3 has a good corrosion inhibition effect on carbon steel in H2SO4 solution. Comparing the data in Table 3, it can be found that after compounding with potassium iodide, the polarization resistance value and corrosion inhibition efficiency are significantly increased. Therefore, potassium iodide has a good corrosion inhibition synergistic effect with the organic matter in the bottom pot water of brewing.

[0073] 3. Study on the performance of antioxidants.

[0074] Evaluation of antioxidant scavenging ability of OH

[0075] The ability of crude polysaccharide to scavenge ·OH was determined by colorimetry using reagents from Nanjing Jiancheng Bioengineering Institute, and the ·OH scavenging rate was calculated using formula (2-1).

[0076]

[0077] Where: A 对照 、A 空白 、A 测定 They correspond to the control tube, blank tube, and absorbance of the measured sample respectively.

[0078] The results of the scavenging experiment on ·OH by crude polysaccharide at different concentrations are shown in Figure 10 .from Figure 10 As can be seen in the figure, the scavenging rate gradually increases with increasing crude polysaccharide concentration, showing a positive correlation. When the crude polysaccharide concentration is 1.0g / L, the scavenging rate reaches 70.6%. Compared with existing technologies, the antioxidant properties of crude polysaccharides obtained from brewing water are higher than those of polysaccharides such as black ginseng polysaccharide, red date crude polysaccharide, and coptis chinensis polysaccharide. This shows that crude polysaccharide antioxidants in brewing water have good scavenging ability against ·OH and have potential application value.

[0079] Finally, it should be noted that the above embodiments of the present invention are merely examples for illustrating the present invention and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations and modifications can be made based on the above description. It is not possible to enumerate all embodiments here. Any obvious variations or modifications arising from the technical solution of the present invention remain within the scope of protection of the present invention.

Claims

1. A method for utilizing water resources in a brewing pot, characterized in that: The specific steps include: (1) Standing and filtering to remove suspended matter in the brewing pot water, then vacuum distilling to dryness to obtain organic matter A, the distilled water is divided into primary water and tail water, the primary water is reused as a cocktail liquid, and the tail water is recycled or directly discharged; (2) extracting the organic matter A obtained in step (1) with anhydrous ethanol, filtering and washing to obtain an ethanol extract and crude polysaccharide, and recovering ethanol by vacuum distillation of the ethanol extract to obtain organic matter B; and removing monosaccharides from the crude polysaccharide with 80% ethanol to obtain organic matter C; The organic matter A and the organic matter B are used as metal corrosion inhibitors when the steel is in an acidic solution environment; and the organic matter C is used as an antioxidant in removing free radicals.

2. The method for utilizing brewing pot water resources according to claim 1, characterized in that: In step (2), the organic matter A is subjected to multiple ultrasonic extractions using anhydrous ethanol. During each extraction, the mass volume ratio of the organic matter A to anhydrous ethanol is 1 g:10-30 mL.

3. Use of the organic compound A obtained according to claim 1 as a metal corrosion inhibitor in an acidic solution environment of steel.

4. The use of the organic compound A as a metal corrosion inhibitor in an acidic solution environment of steel according to claim 3, characterized in that: The acidic solution is an aqueous solution of concentrated sulfuric acid, hydrochloric acid or nitric acid, the concentration of the acidic solution is 0.1-6 mol / L, and the amount of the metal corrosion inhibitor added is 0.05-1.0 g / L.

5. Use of the organic compound B obtained according to claim 1 as a metal corrosion inhibitor in an acidic solution environment of steel.

6. The use of the organic compound B as a metal corrosion inhibitor in an acidic solution environment of steel according to claim 5, characterized in that: The acidic solution is an aqueous solution of concentrated sulfuric acid, hydrochloric acid or nitric acid, the concentration of the acidic solution is 0.1-6 mol / L, and the amount of the metal corrosion inhibitor added is 0.05-1.0 g / L.

7. The use of the organic compound B as a metal corrosion inhibitor in an acidic solution environment of steel according to claim 5, characterized in that: The metal corrosion inhibitor also contains potassium iodide.

8. The use of the organic compound B as a metal corrosion inhibitor in an acidic solution environment of steel according to claim 7, characterized in that: The amount of potassium iodide added to the metal corrosion inhibitor is 0.0005-0.005 mol / L.

9. Use of the organic compound C obtained according to claim 1 as an antioxidant in scavenging free radicals.

10. Use of the organic compound C as an antioxidant in scavenging free radicals according to claim 9, characterized in that: The free radical is ·OH, and the amount of the antioxidant added is 0.5-1.0 g / L.

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