Application of Prunus cerasifera leaf extract in inhibition of hydrogen production caused by active metal dust encountering water

Abstract

The invention relates to an application of a purple-leaf plum leaf extract in inhibiting hydrogen production of active metal dust when encountering water, and belongs to the field of hydrogen production explosion prevention and treatment of a wet dust removal system. The industrial hydrogen inerting agent which is efficient, non-toxic and low in cost is developed through a simple water-based extraction process by taking a renewable plant resource purple-leaf plum leaf as a raw material, the behavior that active metal dust in a wet dust removal system generates hydrogen when encountering water can be effectively inhibited, and gas explosion caused by hydrogen accumulation in the system is prevented. The purple-leaf plum leaf extract provided by the invention is used as a hydrogen explosion inerting agent of a wet dust removal system and has the characteristics of economy, environmental protection and degradability.

Description

TECHNICAL FIELD

[0001] The present application relates to the application of a purple leaf plum leaf extract in inhibiting the production of hydrogen by active metal dust in water, belonging to the field of metal hydrogen production explosion prevention in wet dust removal systems. BACKGROUND

[0002] With the development of energy society, aluminum and alloy products with excellent performance characteristics are widely used in mechanical manufacturing, storage and transportation systems, transportation industries, and are important basic materials for green energy development. However, the growing demand for aluminum products has brought many challenges to safety production and environmental protection in energy-related fields. Aluminum-silicon alloy, with its low density, high temperature resistance, high specific stiffness, high specific strength and corrosion resistance, has become an economical and widely used material, and is widely used in the fields of automobiles, aerospace and defense industry. In the processing and production process of aluminum-silicon alloy materials, polishing and grinding processes will produce a large amount of micron-sized dust. If not properly handled, these dusts not only have the risk of dust explosion, but also cause environmental pollution and threaten the health of workers. Therefore, many high-risk, personnel-intensive explosion-related enterprises use wet dust removal process to collect and treat metal polishing dust. The dust generated by polishing and grinding process usually has a particle size of several microns to several hundred microns, a large specific surface area, and high reactivity, which reacts with water to generate hydrogen gas during the wet dust removal process. The explosion limit of hydrogen is extremely low, and it is extremely easy to accumulate in a closed or semi-closed environment, thereby causing an explosion accident. Wet dust collector is an effective method to control aluminum dust, however, in the process of treating aluminum dust, although the traditional wet dust removal method can remove dust particles, the reaction of aluminum with water will generate hydrogen, which will lead to potential explosion risk. These risks not only threaten the safety of the production process, but also may have a negative impact on the stability of the environment and energy system. Therefore, inerting agents are often added to the water body of the wet dust collector, which to some extent solves the risk of hydrogen generation and explosion in the dust collector.

[0003] At present, there are many kinds of inerting agents, which are divided into organic and inorganic inerting agents. However, the existing organic and inorganic inerting agents may have the disadvantages of toxicity, environmental pollution, complex preparation process, single active ingredient and high cost, which limits their practicality in industrial sites. At present, it is very difficult to screen inerting agents based on the concept of environmental protection to solve the problem of hydrogen explosion in wet dust collectors. In addition, although plant extracts have been used as hydrogen-producing inerting agents, considering a series of problems such as solubility, hydrogen inhibition performance and complex preparation process, it is still very difficult to develop new plant-based inerting agents. Therefore, it is particularly important to develop and explore green and inexpensive inerting agents.

[0004] Prunus cerasifera Ehrh. is originally from Xinjiang, and is widely distributed in North China and other provinces. As a deciduous small tree of Rosaceae, Prunus cerasifera Ehrh. has purple leaves all the year round, and is a famous ornamental and medicinal tree species. The fruits and leaves of Prunus cerasifera Ehrh. are rich in various bioactive components, and have significant medicinal value. The anthocyanins, flavonoids, organic acids and a small amount of volatile oil in the leaves of Prunus cerasifera Ehrh. make the leaves present a unique purple red color, and are used for coloring of medicines, foods and cosmetics. However, the technical scheme of using Prunus cerasifera Ehrh. leaf extract as an inertizing agent in a wet dust collector and applying the inertizing agent has not been reported in the prior art, and therefore, a new inertizing agent based on Prunus cerasifera Ehrh. leaf extract needs to be designed to fill the gap in the prior art. SUMMARY

[0005] In view of the problems of toxicity, environmental pollution, complex preparation process, single active ingredient and high cost of organic and inorganic inertizing agents in the prior art, the application provides an application of Prunus cerasifera Ehrh. leaf extract in inhibition of hydrogen production of active metal dust in contact with water. The application uses renewable plant resources Prunus cerasifera Ehrh. leaves as raw materials, and develops an efficient, non-toxic and low-cost industrial-grade hydrogen inertizing agent through a simple water-based extraction process, thereby providing an innovative solution for hydrogen-sensitive equipment and environmentally friendly manufacturing.

[0006] To achieve the above object, the application adopts the following technical scheme: The application provides an application of Prunus cerasifera Ehrh. leaf extract in inhibition of hydrogen production of active metal dust in contact with water.

[0007] Further, the active metal dust is micron-sized aluminum-silicon alloy dust.

[0008] Further, in the application, the Prunus cerasifera Ehrh. leaf extract can effectively inhibit the hydrogen production behavior of micron-sized aluminum-silicon alloy dust in contact with water, and can be used as a new type of hydrogen explosion inertizing agent for a wet dust removal system to assist in preventing and controlling the hydrogen explosion risk of the wet dust removal system.

[0009] Still further, the micron-sized aluminum-silicon alloy dust is dust generated in actual production process, or micron-sized aluminum-silicon alloy dust obtained by mixing the following mass percentages: 90% of aluminum and 10% of silicon, and the median particle size is 28.392 μm.

[0010] Preferably, the Prunus cerasifera Ehrh. leaf extract is a water-based extract of Prunus cerasifera Ehrh. leaves.

[0011] Further preferably, the main components of the Prunus cerasifera Ehrh. leaf extract include 1-(2,4,6-trimethoxyphenyl)-1-methylpropanone and 5-methoxy-2,3,7,9-tetramethylpyrido[2,3-g]indole, and the structural formula is as shown below: .

[0012] Further preferably, the Prunus cerasus L. leaf extract is prepared by the following method: Prunus cerasus L. leaf powder is added to deionized water, stirred, heated, concentrated, filtered, and dried to obtain the Prunus cerasus L. leaf extract.

[0013] In the above technical solution, the Prunus cerasus L. leaves are washed with deionized water for 3 times, naturally dried, ground by a powder grinder, and sieved through a 100-mesh sieve to obtain the Prunus cerasus L. leaf powder.

[0014] In the above technical solution, the mass-volume ratio of the Prunus cerasus L. leaf powder to deionized water is 1 g: 10-20 mL.

[0015] Preferably, the mass-volume ratio of the Prunus cerasus L. leaf powder to deionized water is 1 g: 10 mL.

[0016] In the above technical solution, the Prunus cerasus L. leaf powder is added to deionized water, heated and concentrated at a temperature of 60-80°C and a rotation speed of 300-600 rpm for 6-8 hours.

[0017] Preferably, the Prunus cerasus L. leaf powder is added to deionized water, heated and concentrated at a temperature of 70°C and a rotation speed of 300-600 rpm for 7 hours.

[0018] Preferably, a 200-mesh filter cloth is used for filtering.

[0019] In the above technical solution, the concentrated solution is dried in a vacuum drying oven at 60-80°C for 24-48 hours.

[0020] Preferably, the concentrated solution is dried in a vacuum drying oven at 70°C for 24 hours.

[0021] A method for inhibiting the production of hydrogen by active metal dust in water in a wet dust removal system, characterized in that Prunus cerasus L. leaf extract is added to the dust collection water body of the wet dust removal system.

[0022] Further, the mass-volume ratio of the Prunus cerasus L. leaf extract to the dust collection water body is 0.02-0.06 g / L.

[0023] Preferably, the mass-volume ratio of the Prunus cerasus L. leaf extract to the dust collection water body is 0.06 g / L.

[0024] Further, the Prunus cerasus L. extract of a certain concentration is added to the dust collection water body at the bottom of the wet dust collector, and the micron-sized aluminum-silicon dust collected in the water body will not react with water to generate hydrogen.

[0025] Further, in the actual production process, the addition amount of the Prunus cerasifera leaf extract can be adjusted according to the properties and concentration of the generated active metal dust, for example, when the metal dust concentration increases, the mass-volume ratio of the Prunus cerasifera leaf extract to the dust-collecting water body can be appropriately increased to ensure a better hydrogen inhibition effect.

[0026] Advantages of the present application: The Prunus cerasifera leaf extract provided by the present application can be used as a new inerting agent to efficiently inhibit the hydrogen production behavior of micron-sized aluminum-silicon dust in a water medium. Meanwhile, the Prunus cerasifera leaf extract provided by the present application has a simple and efficient preparation process, and has the advantages of economy, environmental protection, and biodegradability. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A preparation flowchart of the Prunus cerasifera leaf extract described in the present application.

[0028] Figure 2 A particle size distribution graph of micron-sized aluminum-silicon alloy powder.

[0029] Figure 3 A Fourier infrared spectrum graph of the Prunus cerasifera leaf extract obtained in Example 1.

[0030] Figure 4 A GC-MS result graph of the Prunus cerasifera leaf extract obtained in Example 1.

[0031] Figure 5 Chemical molecular structure formulas of two main substances in the Prunus cerasifera leaf extract obtained in Example 1.

[0032] Figure 6 A hydrogen production curve graph of micron-sized aluminum-silicon alloy dust in the absence of Prunus cerasifera leaf extract and in the presence of different concentrations of Prunus cerasifera leaf extract.

[0033] Figure 7 A Langmuir adsorption isotherm obtained by fitting the hydrogen production curve of micron-sized aluminum-silicon alloy dust in the presence of different concentrations of Prunus cerasifera leaf extract.

[0034] Figure 8 SEM-EDS graphs of micron-sized aluminum-silicon alloy dust in the absence of and in the presence of Prunus cerasifera leaf extract. DETAILED DESCRIPTION

[0035] The following non-limiting examples can enable those of ordinary skill in the art to more fully understand the present application, but in no way limit the present application.

[0036] In the following examples, the test methods described are conventional methods unless otherwise specified; and the reagents and materials described are commercially available unless otherwise specified.

[0037] Example 1 A method for preparing a water-based extract of purple-leaf plum leaves is described below. Figure 1 It includes the following steps: Purple-leaf plum leaves were washed three times with deionized water and naturally sun-dried. The leaves were then pulverized using a grinder and passed through a 100-mesh sieve to obtain purple-leaf plum leaf powder. 40 g of the leaf powder was weighed and added to a large beaker containing 400 mL of deionized water. The beaker was placed on a stirrer set to 70℃ and 300-600 rpm for 7 hours to concentrate the powder, yielding a mixed solution. The mixed solution was filtered through a 200-mesh filter cloth to obtain 15 mL of concentrated liquid. The concentrated liquid was then dried in a vacuum dryer at 70℃ for 24 hours to obtain a brownish-red solid extract, which is the water-based extract of purple-leaf plum leaves.

[0038] Example 2 Hydrogen inhibition experiment of the water-based extract of Prunus cerasifera leaves obtained in Example 1 Add a particle with a median particle size of 28.392 μm (see [reference]) to the aluminum molten metal reaction tester. Figure 2 Aluminum-silicon alloy powder (by mass percentage: aluminum 90%, silicon 10%) was added to 200 mL of deionized water, along with different concentrations (0.02~0.06 g / L) of *Prunus cerasifera* leaf extract. The pressure changes within the reaction vessel were observed to determine the effect of extract concentration on hydrogen suppression. To facilitate comparison of hydrogen suppression efficiency at different concentrations, the pressure within the vessel was converted to hydrogen production rate (α) using the following formula:

[0039] in: P and P 0 represents the initial and final pressure at the end of hydrolysis, in kPa; V and V 0 represents the volume of the system container and the volume of the solution, in mL; n The amount of hydrogen gas theoretically produced by the complete hydrolysis of metal powder is expressed in mol. R The value represents the ideal gas constant, 8.314 J / (mol·K). T The value in K represents the temperature of the hydrolysis experiment.

[0040] The hydrogen suppression efficiency (σ) of different concentrations of Prunus cerasifera leaf extract on micron-sized aluminum-silicon alloy dust was calculated according to the following formula based on the hydrogen production rate:

[0041] in: The hydrogen conversion rate of the blank solution; The hydrogen conversion rate is given by different concentrations of Prunus cerasifera leaf extract solutions.

[0042] The functional groups contained in the purple leaf plum leaf extract obtained in Example 1 were tested by infrared spectroscopy test technology, the test range was 4000 cm -1 to 400 cm -1 , and the results are shown in Figure 3 . As can be seen from Figure 3 , the absorption peak of the purple leaf plum leaf extract at 3423.51 cm -1 is the stretching vibration of -OH / -NH-, the absorption peak at 2920.18 cm -1 is the stretching vibration of C-H, the absorption peak at 1617.50 cm -1 is the stretching vibration of C=C or C=N, the absorption peak at 1401.51 cm -1 is the bending vibration of C-H, and the absorption peak at 1077.05 cm -1 is the stretching vibration of C-O (connected with alkyl) and C-N. This shows that the purple leaf plum leaf extract contains a large amount of O and N functional groups, which has the potential to be a high-efficiency hydrogen inhibitor.

[0043] The main chemical components of the purple leaf plum leaf extract obtained in Example 1 were determined by gas chromatography-mass spectrometry, and the GC-MS results are shown in Figure 4 , and the molecular structure formulas of the two main components are shown in Figure 5 . As can be clearly seen from Figure 5 , these two components contain N and O heteroatoms, unsaturated bonds and heterocyclic structures, which makes the purple leaf plum leaf extract exhibit high hydrogen inhibition performance.

[0044] The hydrogen inhibition performance test curve of the purple leaf plum leaf extract obtained in Example 1 is shown in Figure 6 , and the hydrogen inhibition efficiency is shown in Table 1. As can be seen from Figure 6The results show that: without the action of *Prunus cerasifera* leaf extract, the hydrogen production rate of micron-sized aluminum-silicon alloy dust is extremely fast and the duration is relatively long; after adding *Prunus cerasifera* leaf extract, the hydrogen inhibition effect increases with the increase of extract concentration; when the extract concentration is 0.02 g / L, the hydrogen production rate decreases significantly from 0 to 14 h, but after 15 h, due to the depletion of extract, the hydrogen inhibition effect decreases and the hydrogen production rate returns to normal; when the extract concentration is 0.03 g / L, the decrease in hydrogen production rate is greater, and the point at which the hydrogen production rate increases significantly occurs later; when the extract concentration is above 0.04 g / L, the hydrogen production rate is almost zero within 24 h, indicating that the hydrogen inhibition effect of *Prunus cerasifera* leaf extract at concentrations above 0.04 g / L is significant and long-lasting; and when the concentration is above 0.06 g / L, the hydrogen production rate is only 0.010 within 24 h, showing the most significant inhibition effect. As shown in Table 1, the hydrogen inhibition efficiency of the Prunus cerasifera leaf extract is positively correlated with concentration, and the efficiency increases with increasing concentration. However, there is a saturation point; the hydrogen inhibition efficiency is 93.93% at a concentration of 0.06 g / L. This is because the higher the concentration of the Prunus cerasifera leaf extract, the more effective hydrogen inhibition molecules are present per unit volume. More hydrogen inhibition molecules are adsorbed onto the aluminum alloy to form an adsorption film, inhibiting the hydrolysis reaction.

[0045] Table 1. Inhibition efficiency of different concentrations of Prunus cerasifera leaf extract on hydrogen production from micron-sized aluminum-silicon alloy dust.

[0046] The Langmuir adsorption isotherm obtained after the purple-leaf plum leaf extract was adsorbed on the surface of micron-sized aluminum-zinc alloy dust is shown in the figure. Figure 7 As can be seen, the correlation coefficient of the fitted curve is 0.9969, which is close to 1. This indicates that the adsorption mechanism of Prunus cerasifera leaf extract on the surface of aluminum alloy dust particles conforms to the Langmuir adsorption model.

[0047] SEM-EDS images of the reaction between micron-sized aluminum-silicon alloy dust and aqueous solution or aqueous solution containing Prunus cerasifera leaf extract are shown below. Figure 8 .from Figure 8 As can be seen, after the aluminum-silicon alloy dust reacts with water, the particles are irregular in shape, rough in surface, and covered with rod-shaped substances; while the aluminum-silicon alloy dust treated with Prunus cerasifera leaf extract has a dense and smooth surface, and the particles are spherical. Aluminum atoms lose electrons and are oxidized to aluminum ions. Hydroxides in the water combine with aluminum ions, resulting in a large amount of oxygen (O) in the hydrolyzed aluminum. After the aluminum alloy dust reacts alone with water, the mass fraction of Al is 30.70% and the mass fraction of O is 61.05%; while after hydrolysis with Prunus cerasifera leaf extract, the mass fraction of Al is 72.84% and the mass fraction of O is 1.04%. This demonstrates that Prunus cerasifera leaf extract forms a dense oxide film on the surface of the aluminum alloy dust, effectively blocking the hydrolysis reaction of the metal dust.

[0048] In summary, the purple leaf plum leaf extract provided by the present application can be used as a new type of inerting agent to inhibit the hydrogen production behavior of micron-sized aluminum-silicon alloy dust in the water environment of a wet dust collector, and can essentially solve the hydrogen production and explosion, thereby providing efficient and reliable explosion protection for the wet dust removal system.

Claims

1. Use of a Prunus cerasus L. leaf extract in inhibiting hydrogen production of active metal dusts when exposed to water.

2. Use according to claim 1, characterized in that: The active metal dusts are micron-sized aluminum-silicon alloy dusts.

3. Use according to claim 1, characterized in that: The main components of the Prunus cerasus L. leaf extract include 1-(2,4,6-trimethoxyphenyl)-1-methylpropanone and 5-methoxy-2,3,7,9-tetramethylpyrido[2,3-g]indole, and the structural formulas are as follows: 。 4. Use according to claim 1, characterized in that: The Prunus cerasus L. leaf extract is prepared by the following method: after the Prunus cerasus L. leaf powder is added to deionized water, stirring and heating concentration are performed, the concentrated solution is filtered, dried, and the Prunus cerasus L. leaf extract is obtained.

5. Use according to claim 4, characterized in that: The Prunus cerasus L. leaves are washed with deionized water for 3 times, naturally dried, crushed by a powder mill, and passed through a 100-mesh sieve to obtain the Prunus cerasus L. leaf powder.

6. Use according to claim 4, characterized in that: The mass-to-volume ratio of the Prunus cerasus L. leaf powder to deionized water is 1 g: 10-20 mL.

7. Use according to claim 4, characterized in that: After the Prunus cerasus L. leaf powder is added to deionized water, heating concentration is performed at a temperature of 60-80°C and a rotation speed of 300-600 rpm for 6-8 h.

8. Use according to claim 4, characterized in that: The concentrated solution is dried in a vacuum drying oven at 60-80°C for 24-48 h.

9. A method of inhibiting the production of hydrogen from the reaction of water with a reactive metal dust in a wet dust removal system, the method comprising: providing a Prunus cerasus leaf extract; and adding the Prunus cerasus leaf extract to the wet dust removal system. The Prunus cerasus L. leaf extract is added to the dust collection water body of a wet dust removal system.

10. The method of claim 9, wherein: The mass-to-volume ratio of the Prunus cerasus L. leaf extract to the dust collection water body is 0.02-0.06 g / L.

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