N-containing compound peculiar smell removing liquid

Abstract

The invention relates to the technical field of deodorization, and particularly discloses an N-containing compound peculiar smell removing liquid. The N-containing compound peculiar smell removing liquid is prepared from the following raw materials in parts by weight: 0.5 to 5 parts of polyene polyamine, 1 to 10 parts of cyclodextrin, 0.1 to 3 parts of weak acid, 0.1 to 2 parts of a nonionic surfactant, 0.01 to 0.5 part of a metal ion chelating agent, 0.01 to 0.5 part of plant essential oil and 80 to 95 parts of deionized water, the preparation method comprises the following steps: reducing a cyano group into a primary amino group by using ethylenediamine and acrylonitrile, decolorizing by using activated carbon, distilling and purifying to obtain polyene polyamine, dissolving a polyene polyamine intermediate, cyclodextrin, weak acid, a nonionic surfactant and a chelating agent in water at controlled temperature to form a base solution, finally adding a plant essential oil mixture and a preservative, and cooling to obtain a finished product. The composition / product provided by the invention can be used for treating the environment polluted by the peculiar smell of the nitrogen-containing compound, and has the advantages of high-efficiency broad-spectrum deodorization and good environmental compatibility.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of deodorization, in particular to a N-containing compound deodorization liquid. BACKGROUND

[0002] Deodorization is a technology and process for eliminating or reducing odors in the environment through physical, chemical, biological or composite means. The core is to take targeted measures for the source of odor. Physical methods include adsorption, masking, dilution, etc., which play a role by separating or weakening odor molecules; chemical methods use oxidation, neutralization, decomposition, etc. to destroy the structure of odor molecules; biological methods rely on microbial metabolism to degrade odor substances, which are suitable for organic odor treatment. Deodorization technology is widely used in garbage disposal, sewage treatment, breeding, chemical industry, indoor air purification, etc. Among them, the deodorization liquid is an important means of deodorization and is widely used.

[0003] Related deodorization liquids decompose malodorous molecules by strong oxidizing agents or strong acids, but the above components have strong corrosive and high reactivity, not only causing irreversible damage to metal equipment, but also generating toxic by-products in the process of decomposing nitrogen-containing compounds; at the same time, a single mechanism cannot simultaneously treat complex odors composed of nitrogen, sulfur and hydrocarbons; thus, the deodorization efficiency is limited, the application scene is narrow, and there is a risk of secondary pollution. SUMMARY

[0004] In order to solve the problem of limited deodorization efficiency, narrow application scene and secondary pollution risk caused by the decomposition of malodorous molecules by strong oxidizing agents or strong acids in related deodorization liquids, the application provides a N-containing compound deodorization liquid.

[0005] The application provides a N-containing compound deodorization liquid, which adopts the following technical scheme: A N-containing compound deodorization liquid is made of raw materials containing the following weight parts: polyene polyamine 0.5-5 parts, cyclodextrin 1-10 parts, weak acid 0.1-3 parts, non-ionic surfactant 0.1-2 parts, metal ion chelating agent 0.01-0.5 parts, plant essential oil 0.01-0.5 parts and deionized water 80-95 parts.

[0006] By adopting the technical scheme, since the primary amine group of the polyene polyamine is protonated to form a quaternary ammonium cation in a weak acid environment, and then captures the nitrogen-containing small-molecule malodorous substances through electrostatic attraction; the hydrophobic cavity of the cyclodextrin encloses the nonpolar odor molecules through Van der Waals force; the weak acid dissociates to produce hydrogen ions to maintain the charge balance of the system; meanwhile, the hydrophilic-lipophilic structure of the nonionic surfactant reduces the surface tension of the solution, promotes the spreading and penetration of the active components on the oily contaminated surface; the metal ion chelating agent is used to block calcium and magnesium ions through coordination bonds to prevent metal impurities from causing inactivation of the active ingredients; and the terpene compounds of the plant essential oil modify the conformation of the odor molecules and block their binding path with the olfactory receptors; thus, the capture, conversion and inactivation of the odor molecules are achieved, ensuring that the deodorant liquid remains chemically stable and biocompatible, while avoiding pollution of the ecological environment.

[0007] Preferably, the cyclodextrin is compounded by hydroxypropyl-β-cyclodextrin and sulfobutyl-β-cyclodextrin at a mass ratio of 1:1-3.

[0008] By adopting the technical scheme, since the hydrophobic cavity of the hydroxypropyl-β-cyclodextrin can enclose small-molecule sulfur-containing malodorous substances such as methyl mercaptan through intermolecular forces to form stable host-guest complexes; and the sulfobutyl-β-cyclodextrin has negatively charged sulfonic acid groups, which enable it to capture protonated positively charged nitrogen-containing odor molecules such as trimethylamine through electrostatic attraction in a pH 6.0-7.5 environment; according to the water solubility difference between hydroxypropyl-β-cyclodextrin and sulfobutyl-β-cyclodextrin, when they are compounded at a mass ratio of 1:1-3, the critical micelle concentration of the mixture is maintained within the range of 0.8-1.2 mmol / L, avoiding the increase in solution turbidity caused by excessive single components; when the compounding ratio is less than 1:1, the system's encapsulation efficiency for nonpolar malodorous substances decreases; when the ratio is greater than 1:3, the solution conductivity is too high, which in turn causes the metal ion chelating agent to lose effectiveness at a faster rate; thus, the sulfur-containing and nitrogen-containing malodorous substances are captured through hydrophobic encapsulation and electrostatic adsorption, while the critical micelle concentration is maintained stable, avoiding the increase in turbidity and functional decay caused by the precipitation of active ingredients.

[0009] Preferably, the polyene polyamine is prepared by the following steps: first, reacting ethylenediamine with acrylonitrile at a mass ratio of 1:1.8-2.2 at 40-60°C for 2-4 hours, controlling the pH to be 8.0-9.0; then adding Raney nickel catalyst and hydrogenating under a hydrogen pressure of 1.5-2.5 MPa; after that, adding activated carbon to the reaction product, decolorizing at 70-80°C, and then distilling and purifying, and collecting the fraction with a boiling range of 190-220°C.

[0010] By employing the above-mentioned technical solution, the primary amino group of ethylenediamine undergoes nucleophilic addition with the cyano group of acrylonitrile to generate an aminopropionitrile intermediate. Maintaining a pH of 8.0-9.0 ensures a relatively fast reaction rate while preventing the hydrolysis of acrylonitrile to produce acrylic acid as a byproduct. Subsequently, a Raney nickel catalyst is added. This catalyst, formed by activation of a nickel-aluminum alloy with sodium hydroxide to create a porous framework structure, catalyzes the hydrocracking reaction of the aminopropionitrile intermediate under a hydrogen pressure of 1.5-2.5 MPa, reducing the cyano group to a primary amino group. Activated carbon is then added to the reaction product for decolorization. The activated carbon retains residual nickel catalyst particles and high-molecular-weight heterocyclic amine byproducts through physical adsorption. Finally, the fraction at 190-220℃ is separated using an atmospheric pressure distillation apparatus based on the boiling point difference.

[0011] Preferably, the Raney nickel catalyst is used at a rate of 0.5% to 2% of the total mass of acrylonitrile and ethylenediamine, and the hydrogenation reduction reaction temperature is 60-80°C.

[0012] By employing the above technical solution, the porous framework structure of the Raney nickel catalyst dissociates hydrogen molecules into active hydrogen atoms. These active hydrogen atoms directionally attack the cyano carbon atoms of the aminopropionitrile intermediate, achieving highly selective reduction of the cyano group to the primary amine group. Simultaneously, the catalyst dosage is controlled between 0.5% and 2% of the total mass of acrylonitrile and ethylenediamine. This dosage range ensures that the active sites on the catalyst surface completely cover the reaction interface while avoiding the deamination side reaction caused by excessive nickel metal. Furthermore, the hydrogenation reduction temperature is maintained at 60-80℃. This temperature window lowers the activation energy for cyano reduction and inhibits the cyclization condensation of the ethylenediamine framework. Therefore, a high-purity linear polyene polyamine product is obtained, with increased primary amine density, further reduced secondary amine impurity content, a solution color meeting the requirement of being colorless and transparent, and heavy metal residues below the ecological safety limit.

[0013] Preferably, the amount of activated carbon added during decolorization is 1% to 3% of the product mass.

[0014] By employing the above-mentioned technical solution, the amount of activated carbon added in the corresponding decolorization process is 1% to 3% of the product mass. Its mesoporous structure selectively adsorbs piperazine heterocyclic by-products with a molecular weight greater than 500 Da and nickel catalyst fragments, thus achieving a further impurity removal effect.

[0015] Preferably, the plant essential oil is a mixture of eucalyptus oil, lemongrass oil and tea tree oil in a mass ratio of 1:0.5-2:0.2-1.

[0016] By employing the above technical solutions, eucalyptus oil, rich in small-molecule monoterpene cyclic ether structures, forms coordinate bonds between the lone pair electrons of its oxygen atoms and the sulfur atoms of sulfur-containing odor molecules, achieving chemical neutralization of small-molecule odors. Meanwhile, the aldehyde functional groups in lemongrass oil react with the amino groups of amine odor molecules to generate non-volatile condensation products. The long-chain terpenes in tea tree oil encapsulate non-polar macromolecular odor substances through hydrophobic interactions. When the proportion of eucalyptus oil is lower than the mass ratio benchmark, the neutralization efficiency of small-molecule odors decreases. When the proportion of tea tree oil exceeds the upper limit, terpenes disrupt the surfactant micelle structure, leading to deterioration of solution stability. Therefore, the solution achieves deodorization and odor masking, simultaneously eliminating sulfur-based, amine-based, and hydrocarbon-based odors while maintaining homogeneous stability.

[0017] Preferably, the nonionic surfactant is a mixture of polyoxyethylene sorbitan monolaurate and alkyl glycoside in a mass ratio of 1:1-3.

[0018] By adopting the above technical solution, the polyoxyethylene chains of polyoxyethylene sorbitan monolaurate form a hydration layer that reduces the surface tension of the solution, and its hydrophobic lauric acid chains insert into the interior of oily odorous substances; the hydrophilic glycoside groups of alkyl glycosides form a hydrogen bond network with the polar groups of odorous molecules, while the long-chain alkyl groups break down the aggregated state of non-polar odor molecules through hydrophobic interactions; thus, the dissociation effect of oil-water two-phase odorous substances is achieved.

[0019] Preferably, the metal ion chelating agent is disodium ethylenediaminetetraacetate.

[0020] By adopting the above technical solution, since disodium ethylenediaminetetraacetate forms a stable chelating ring through nitrogen and oxygen atoms, and its cavity diameter matches the radius of divalent metal ions, this chelating agent selectively captures calcium and magnesium ions in the solution, thereby preventing the metal ions from binding to the primary amine groups of polyenes and polyamines through steric hindrance. Therefore, it prevents the metal ions from inducing the deactivation of the effective components, ensures that the deodorizing liquid maintains the activity of its components in hard water environments, and ensures the effectiveness of the deodorizing liquid in scenarios with metal ion pollution.

[0021] Preferably, the weak acid is at least one of citric acid, tartaric acid, and acetic acid; and when the amount of polyene polyamine is greater than 2 parts, the amount of weak acid is increased by 0.2 to 0.5 parts accordingly.

[0022] By employing the above technical solution, due to the tricarboxylic acid structure of citric acid, the hydroxycarboxylic acid properties of tartaric acid, and the small molecule properties of acetic acid, three proton supply mechanisms are formed in the solution: tertiary dissociation equilibrium, chelation-assisted dissociation, and rapid ionization. When the amount of polyene polyamine exceeds 2 parts, the amount of hydrogen ions required for the protonation of the primary amine increases synchronously. By using 0.2 to 0.5 parts of weak acid, additional carboxyl groups continuously release protons to compensate for the charge vacancy. This mechanism ensures that the system always maintains the minimum pH threshold required for the full protonation of the primary amine under fluctuating polyene polyamine concentrations. Therefore, it achieves the effect of preventing the volatilization and escape of unprotonated primary amine groups at high amine contents, thereby eliminating the risk of colloidal precipitation and phase separation, while maintaining the integrity of the cyclodextrin inclusion cavity conformation.

[0023] Preferably, the preservative is 0.01 to 0.5 parts, and the preservative is at least one of sodium benzoate, potassium sorbate or methylparaben.

[0024] By employing the above technical solution, the undissociated benzoic acid molecules of sodium benzoate penetrate the microbial cell membrane through the lipophilic benzene ring structure, interfering with the proton transmembrane gradient; while the α,β-unsaturated carboxylic acid groups of potassium sorbate irreversibly bind to the active center of microbial dehydrogenases, blocking energy metabolism pathways; simultaneously, the phenolic hydroxyl groups and alkyl chains of methylparaben insert into the phospholipid bilayer of the cell membrane through hydrophobic interactions, disrupting the integrity of the membrane structure; when the total amount of preservative is below the critical dosage, the heterotrophic bacterial biofilm proliferates rapidly at the solution interface; while when the total amount exceeds the suitable range, the preservative molecules compete with surfactant micelles for binding, leading to an increase in the turbidity of the deodorizing liquid; thus, the antibacterial effect of targeted cell membrane destruction, metabolic enzyme inactivation, and membrane structure dissociation is achieved.

[0025] In summary, this application has the following beneficial effects: 1. Because this application uses polyene polyamine, cyclodextrin, weak acid, nonionic surfactant, metal ion chelating agent and plant essential oil to make odor deodorizer, the polyene polyamine is protonated in the weak acid environment to form quaternary ammonium cations, which capture nitrogen-containing malodorous substances through electrostatic attraction. At the same time, the hydrophobic cavity of cyclodextrin encapsulates nonpolar odor molecules, while the dissociation of weak acid provides hydrogen ions to maintain charge balance. The nonionic surfactant reduces surface tension and promotes the penetration of active components into oily surfaces. The chelating agent blocks calcium and magnesium ions to prevent component deactivation, and the plant essential oil blocks the binding of olfactory receptors. Therefore, it achieves the effects of highly efficient deodorization, high chemical stability and strong environmental compatibility.

[0026] 2. In this application, hydroxypropyl-β-cyclodextrin and sulfobutyl-β-cyclodextrin are preferably compounded in a mass ratio of 1:1-3. The hydroxypropyl component selectively encapsulates sulfur-containing odorous substances to form stable complexes, while the sulfobutyl component electrostatically adsorbs protonated nitrogen-containing odor molecules through negatively charged sulfonic acid groups in an environment of pH 6.0-7.5. The optimized ratio maintains the critical micelle concentration at a certain level, avoiding the increase in turbidity or excessive conductivity of the solution caused by excessive single component, which would lead to the failure of the chelating agent. Therefore, the effect of highly efficient capture of sulfur-based and amine-based odors and homogeneous and stable solution is achieved.

[0027] 3. The method of this application involves reacting ethylenediamine with acrylonitrile at pH 8.0-9.0 and 40-60℃ to generate an intermediate. Then, using a Raney nickel catalyst, the cyano group is hydrogenated and reduced to a primary amine group at 1.5-2.5 MPa hydrogen pressure and 60-80℃. The intermediate is then decolorized with activated carbon and purified by boiling at 190-220℃. Because of the porous framework of Raney nickel, the reduction is highly efficient, and the dosage of 0.5%–2% avoids deamination side reactions. Activated carbon adsorbs large molecular weight byproducts, and distillation captures specific fractions. Therefore, high-purity polyene polyamines are obtained, and the product is colorless, transparent, and suitable for hard water environments. Detailed Implementation

[0028] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0029] Related deodorizing liquids decompose malodor molecules through strong oxidants or strong acids. However, these components are highly corrosive and reactive, causing irreversible damage to metal equipment and producing toxic byproducts during the decomposition of nitrogen-containing compounds. At the same time, a single mechanism of action cannot simultaneously treat complex odors composed of nitrogen, sulfur, and hydrocarbons. This results in limited deodorization efficiency, narrow application scenarios, and the risk of secondary pollution.

[0030] This application discloses an odor-removing liquid containing nitrogen compounds, which is made from the following raw materials in parts by weight: 0.5-5 parts of polyene polyamine, 1-10 parts of cyclodextrin, 0.1-3 parts of weak acid, 0.1-2 parts of nonionic surfactant, 0.01-0.5 parts of metal ion chelating agent, 0.01-0.5 parts of plant essential oil, and 80-95 parts of deionized water. The preparation method is as follows: ethylenediamine and acrylonitrile reduce the cyano group to a primary amine group, and then the polyene polyamine is obtained by decolorization with activated carbon and distillation. The polyene polyamine intermediate is dissolved in water with cyclodextrin, weak acid, nonionic surfactant and chelating agent under controlled temperature to form a base liquid. Finally, a mixture of plant essential oil and preservative is added, and the product is obtained after cooling.

[0031] This application employs a deodorizing agent formulated with polyene polyamines, cyclodextrins, weak acids, nonionic surfactants, metal ion chelating agents, and plant essential oils. Polyene polyamines protonate in a weakly acidic environment to form quaternary ammonium cations, which capture nitrogen-containing malodorous substances through electrostatic attraction. Simultaneously, the hydrophobic cavities of cyclodextrin encapsulate nonpolar odor molecules, while the dissociation of the weak acid provides hydrogen ions to maintain charge balance. The nonionic surfactants reduce surface tension, promoting the penetration of active components into oily surfaces. Furthermore, the chelating agents block calcium and magnesium ions to prevent component deactivation, and the plant essential oils block the binding of olfactory receptors. Therefore, this process achieves highly efficient deodorization, high chemical stability, and strong environmental compatibility.

[0032] Preparation Example 1 The preparation method of cyclodextrin is as follows: Hydroxypropyl-β-cyclodextrin and sulfobutyl-β-cyclodextrin were mixed at a mass ratio of 1:2. Deionized water was added and the mixture was stirred at 60°C until completely dissolved. The solution was filtered through a 0.22 μm microporous membrane and freeze-dried to obtain a white powder, thus preparing cyclodextrin.

[0033] Ethylenediamine: purchased from Sinopharm Chemical Reagent Co., Ltd., grade E801890; Acrylonitrile: purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., grade A116128; Hydroxypropyl-β-cyclodextrin: purchased from Shanghai Maclean Biochemical Technology Co., Ltd., grade H817902; Sulfobutyl-β-cyclodextrin: purchased from Shanghai Maclean Biochemical Technology Co., Ltd., grade S862885; Citric acid: purchased from Sinopharm Chemical Reagent Co., Ltd., grade C805861; Tartaric acid: purchased from Sinopharm Chemical Reagent Co., Ltd., grade T806092; Acetic acid: purchased from Sinopharm Chemical Reagent Co., Ltd., grade A800706; Polyoxyethylene sorbitan monolaurate: purchased from Nanjing Chemical Reagent Co., Ltd., grade T9040; Alkyl glycoside: purchased from Nanjing Chemical Reagent Co., Ltd., grade APG0814; Disodium ethylenediaminetetraacetate: purchased from Sinopharm Chemical Reagent Co., Ltd. The following products were purchased from Sinopharm Chemical Reagent Co., Ltd.: E803910 (purchasing); Eucalyptus oil: purchased from Shanghai Maclean Biochemical Technology Co., Ltd., brand name E817632; Lemongrass oil: purchased from Shanghai Maclean Biochemical Technology Co., Ltd., brand name C854108; Tea tree oil: purchased from Shanghai Maclean Biochemical Technology Co., Ltd., brand name T817621; Sodium benzoate: purchased from Sinopharm Chemical Reagent Co., Ltd., brand name B806202; Potassium sorbate: purchased from Sinopharm Chemical Reagent Co., Ltd., brand name S806302; Methylparaben: purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., brand name H107248; Raney nickel catalyst: purchased from Nanjing Chemical Reagent Co., Ltd., brand name R0202; Activated carbon: purchased from Sinopharm Chemical Reagent Co., Ltd., brand name A801186; Sodium hydroxide: purchased from Sinopharm Chemical Reagent Co., Ltd., brand name S804792.

[0034] Example 1 This embodiment provides an odor-removing liquid containing nitrogen compounds, made from the following raw materials in parts by weight: ethylenediamine: 0.05 parts, acrylonitrile: 0.09 parts, cyclodextrin: 1 part, citric acid: 0.1 parts, polyoxyethylene sorbitan monolaurate: 0.05 parts, alkyl glycoside: 0.05 parts, disodium ethylenediaminetetraacetate: 0.01 parts, eucalyptus oil: 0.0059 parts, lemongrass oil: 0.0029 parts, tea tree oil: 0.0012 parts, sodium benzoate: 0.01 parts, Raney nickel catalyst: 0.0017 parts, activated carbon: 0.003 parts, and deionized water: 95 parts.

[0035] The preparation method of the above-mentioned nitrogen-containing deodorizing liquid is as follows: First, polyene polyamines were prepared: 0.05 parts of ethylenediamine and 0.09 parts of acrylonitrile were added to a reaction vessel and reacted at 50°C with magnetic stirring for 3 hours, maintaining the pH at 8.5 by adding 10% sodium hydroxide solution dropwise; then 0.0017 parts of Raney nickel catalyst were added, transferred to a high-pressure reaction vessel, and hydrogen was introduced to a pressure of 2.0 MPa, followed by hydrogenation reduction at 70°C for 4 hours; after the reaction was completed, 0.003 parts of activated carbon were added to the product, and the product was decolorized at 75°C for 30 minutes, and solid impurities were removed by filtration; the filtrate was transferred to a distillation apparatus, and the fraction with a boiling range of 190-220°C was collected under normal pressure to obtain the polyene polyamine intermediate. The obtained polyene-polyamine intermediate was mixed with 1 part cyclodextrin, 0.1 part citric acid, 0.05 part polyoxyethylene sorbitan monolaurate, 0.05 part alkyl glycoside, and 0.01 part disodium EDTA. 95 parts deionized water were added, and the mixture was stirred at 800 rpm in a 60°C water bath to dissolve it. Finally, 0.0059 parts eucalyptus oil, 0.0029 parts lemongrass oil, 0.0012 parts tea tree oil, and 0.01 parts sodium benzoate were added, and the mixture was homogenized for another 10 minutes. After cooling to room temperature, a clear and transparent deodorizing liquid was obtained.

[0036] Example 2 This embodiment provides an odor-removing liquid containing nitrogen compounds, made from the following raw materials in parts by weight: ethylenediamine: 0.15 parts, acrylonitrile: 0.27 parts, cyclodextrin: 5 parts, tartaric acid: 1.3 parts, polyoxyethylene sorbitan monolaurate: 0.333 parts, alkyl glycoside: 0.667 parts, disodium ethylenediaminetetraacetate: 0.2 parts, eucalyptus oil: 0.074 parts, lemongrass oil: 0.074 parts, tea tree oil: 0.037 parts, potassium sorbate: 0.2 parts, 0.005 parts Raney nickel catalyst, 0.008 parts activated carbon, and 90 parts deionized water.

[0037] The preparation method of the above-mentioned nitrogen-containing deodorizing liquid is as follows: First, polyene polyamines were prepared: 0.15 parts of ethylenediamine and 0.27 parts of acrylonitrile were added to a reactor and reacted at 50°C with magnetic stirring for 3 hours, maintaining the pH at 8.5 by adding 10% sodium hydroxide solution dropwise; then 0.005 parts of Raney nickel catalyst were added, transferred to a high-pressure reactor, and hydrogen was introduced to a pressure of 2.0 MPa, followed by hydrogenation reduction at 70°C for 4 hours; after the reaction was completed, 0.008 parts of activated carbon were added to the product, and the product was decolorized at 75°C for 30 minutes, and solid impurities were removed by filtration; the filtrate was transferred to a distillation apparatus, and the fraction with a boiling range of 190-220°C was collected under normal pressure to obtain the polyene polyamine intermediate. The obtained polyene-polyamine intermediate was mixed with 5 parts cyclodextrin, 1.3 parts tartaric acid, 0.333 parts polyoxyethylene sorbitan monolaurate, 0.667 parts alkyl glycoside, and 0.2 parts disodium EDTA. 90 parts deionized water were added, and the mixture was stirred at 800 rpm in a 60°C water bath to dissolve it. Finally, 0.074 parts eucalyptus oil, 0.074 parts lemongrass oil, 0.037 parts tea tree oil, and 0.2 parts potassium sorbate were added, and the mixture was homogenized for another 10 minutes. After cooling to room temperature, a clear and transparent deodorizing liquid was obtained.

[0038] Example 3 This embodiment provides an odor-removing liquid containing nitrogen compounds, made from the following raw materials in parts by weight: ethylenediamine: 0.25 parts, acrylonitrile: 0.45 parts, cyclodextrin: 10 parts, acetic acid: 3.5 parts, polyoxyethylene sorbitan monolaurate: 0.5 parts, alkyl glycoside: 1.5 parts, disodium ethylenediaminetetraacetate: 0.5 parts, eucalyptus oil: 0.125 parts, lemongrass oil: 0.250 parts, tea tree oil: 0.125 parts, methylparaben: 0.5 parts, 0.008 parts Raney nickel catalyst, 0.014 parts activated carbon, and 80 parts deionized water.

[0039] The preparation method of the above-mentioned nitrogen-containing deodorizing liquid is as follows: First, polyene polyamines were prepared: 0.25 parts of ethylenediamine and 0.45 parts of acrylonitrile were added to a reactor and reacted at 50°C with magnetic stirring for 3 hours, maintaining the pH at 8.5 by adding 10% sodium hydroxide solution dropwise; then 0.008 parts of Raney nickel catalyst were added, transferred to a high-pressure reactor, and hydrogen was introduced to a pressure of 2.0 MPa, followed by hydrogenation reduction at 70°C for 4 hours; after the reaction was completed, 0.014 parts of activated carbon were added to the product, and the product was decolorized at 75°C for 30 minutes, and solid impurities were removed by filtration; the filtrate was transferred to a distillation apparatus, and the fraction with a boiling range of 190-220°C was collected under normal pressure to obtain the polyene polyamine intermediate. The obtained polyene-polyamine intermediate was mixed with 10 parts cyclodextrin, 3.5 parts acetic acid, 0.5 parts polyoxyethylene sorbitan monolaurate, 1.5 parts alkyl glycoside, and 0.5 parts disodium EDTA. 80 parts deionized water were added, and the mixture was stirred at 800 rpm in a 60°C water bath to dissolve it. Finally, 0.125 parts eucalyptus oil, 0.250 parts lemongrass oil, 0.125 parts tea tree oil, and 0.5 parts methylparaben were added, and the mixture was homogenized for another 10 minutes. After cooling to room temperature, a clear and transparent deodorizing liquid was obtained.

[0040] Comparative Example 1 The comparative example is the same as in Example 1, except that the amount of polyene polyamine is reduced by reducing ethylenediamine to 0.03 parts and acrylonitrile to 0.054 parts, while the rest is the same as in Example 1.

[0041] Comparative Example 2 The comparative example is the same as in Example 1, except that the amount of polyene polyamine is increased by increasing ethylenediamine to 0.3 parts and acrylonitrile to 0.54 parts, while the rest is the same as in Example 1.

[0042] Comparative Example 3 The comparative example is the same as in Example 1, except that the ratio of cyclodextrin compounding is hydroxypropyl-β-cyclodextrin: sulfobutyl-β-cyclodextrin = 1:0.4, and the rest is the same as in Example 1.

[0043] Comparative Example 4 The comparative example is the same as in Example 1, except that the amount of Raney nickel catalyst used is 0.4% of the total mass of acrylonitrile and ethylenediamine, that is, the amount of catalyst used is reduced to 0.00056 parts, and the rest is the same as in Example 1.

[0044] Comparative Example 5 The comparative example is the same as Example 1, except that the amount of decolorizing activated carbon added is 4% of the product mass, that is, the amount of activated carbon used is increased to 0.006 parts, and the rest is the same as in Example 1.

[0045] Comparative Example 6 The comparative example is the same as in Example 1, except that when the amount of polyene polyamine is greater than 2 parts, the amount of weak acid is not increased, and the rest is the same as in Example 1.

[0046] The performance test results of Examples 1-3 and Comparative Examples 1-6 are shown in Table 1.

[0047] Table 1: 1. Ammonia removal rate: Appendix C of GB / T 18883-2022 "Indoor Air Quality Standard"; 2. Turbidity: GB / T 5750.4-2006 "Standard Examination Methods for Drinking Water: Sensory Characteristics and Physical Indicators"; 3. Primary amine group retention rate: GB / T 11275-2020 "Determination of hydroxyl and amine values ​​of surfactants"; 4. Hard water adaptability decay rate: ISO 18416:2015 "Water quality - Performance testing of metal chelating agents"; 5. Storage stability: GB / T 5551-2010 "Determination of Dispersing Power of Surfactants" and visual observation method.

[0048] Example Conclusion: Based on Examples 1-3 and Comparative Example 1, and in conjunction with Table 1, it can be seen that when the amount of polyene polyamine is below the critical threshold, the ability of the deodorizing liquid to capture nitrogen-containing malodorous substances is severely weakened due to insufficient effective active sites, and the components settle due to the disruption of charge balance.

[0049] Based on Examples 1-3 and Comparative Example 2, and in conjunction with Table 1, it can be seen that excessive polyene polyamines induce excessive intermolecular polymerization, which not only reduces the primary amine matrix protonation efficiency, but also causes the system to gel due to the accumulation of hydrophobic chains, thereby disrupting the homogeneous stability of the solution.

[0050] Based on Examples 1-3 and Comparative Example 3, and in conjunction with Table 1, it can be seen that an imbalance in the compound ratio of cyclodextrin will disrupt the synergistic mechanism of hydrophobic inclusion and electrostatic adsorption, leading to the dissociation and failure of oily odor molecules. At the same time, the destruction of the micelle structure will cause oil phase separation.

[0051] Based on Examples 1-3 and Comparative Example 4, and in conjunction with Table 1, it can be seen that when the Raney nickel catalyst dosage is insufficient, the cyano group reduction is incomplete, which reduces the density of the primary amine group of the polyene polyamine, and the residual metal fragments cause black suspended matter to appear in the solution.

[0052] Based on Examples 1-3 and Comparative Example 5, and in conjunction with Table 1, it can be seen that although excessive activated carbon can adsorb byproducts, its physical retention excessively consumes the effective components, and the residual carbon particles significantly degrade the light transmittance of the solution.

[0053] Combining Examples 1-3 and Comparative Example 6 with Table 1, it can be seen that when the weak acid compensation mechanism is missing, high-concentration polyene polyamines produce free amine volatilization due to insufficient protonation, and at the same time, charge imbalance triggers colloidal precipitation phase transition.

[0054] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A nitrogen-containing deodorizing liquid, characterized in that, It is made from the following raw materials in parts by weight: 0.5 to 5 parts polyene polyamine, 1 to 10 parts cyclodextrin, 0.1 to 3 parts weak acid, 0.1 to 2 parts nonionic surfactant, 0.01 to 0.5 parts metal ion chelating agent, 0.01 to 0.5 parts plant essential oil and 80 to 95 parts deionized water.

2. The nitrogen-containing deodorizing liquid according to claim 1, characterized in that, Cyclodextrin is a compound of hydroxypropyl-β-cyclodextrin and sulfobutyl-β-cyclodextrin in a mass ratio of 1:1-3.

3. The nitrogen-containing deodorizing liquid according to claim 1, characterized in that, The polyene polyamine is prepared by the following steps: First, ethylenediamine and acrylonitrile are reacted at a mass ratio of 1:1.8-2.2 at 40-60℃ for 2-4 hours, with the pH controlled at 8.0-9.0; then Raney nickel catalyst is added, and hydrogenation reduction is carried out under a hydrogen pressure of 1.5-2.5 MPa; then activated carbon is added to the reaction product, and after decolorization at 70-80℃, it is purified by distillation, and the fraction with a boiling range of 190-220℃ is collected.

4. The nitrogen-containing deodorizing liquid according to claim 3, characterized in that, The Raney nickel catalyst is used at a rate of 0.5% to 2% of the total mass of acrylonitrile and ethylenediamine, while the hydrogenation reduction reaction temperature is 60-80℃.

5. The nitrogen-containing deodorizing liquid according to claim 3, characterized in that, The amount of activated carbon added during decolorization is 1% to 3% of the product mass.

6. The nitrogen-containing deodorizing liquid according to claim 1, characterized in that, The plant essential oil is a mixture of eucalyptus oil, lemongrass oil and tea tree oil in a mass ratio of 1:0.5-2:0.2-1.

7. The nitrogen-containing deodorizing liquid according to claim 1, characterized in that, The nonionic surfactant is a mixture of polyoxyethylene sorbitan monolaurate and alkyl glycoside in a mass ratio of 1:1-3.

8. The nitrogen-containing deodorizing liquid according to claim 1, characterized in that, The metal ion chelating agent is disodium ethylenediaminetetraacetate.

9. The nitrogen-containing deodorizing liquid according to claim 1, characterized in that, The weak acid is at least one of citric acid, tartaric acid, and acetic acid; and when the amount of polyene polyamine is greater than 2 parts, the amount of weak acid is increased by 0.2 to 0.5 parts accordingly.

10. The nitrogen-containing deodorizing liquid according to claim 1, characterized in that, It also contains: 0.01 to 0.5 parts of preservative, wherein the preservative is at least one of sodium benzoate, potassium sorbate or methylparaben.

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