Natural deodorant based on limonene and preparation method thereof

Abstract

The invention relates to the field of environmental protection chemistry, and discloses a limonene-based natural deodorant and a preparation method thereof, the limonene-based natural deodorant comprises the following components by weight: 60-70% of limonene, 20-30% of refined pine oil, 3-5% of cedar oil, 3-5% of edible alcohol, 0.05-0.1% of an antioxidant, 1-2% of citric acid, and 0.05-5% of an activator; the preparation method comprises a three-step mixing mode. Compared with a deodorant in the prior art, the natural deodorant based on limonene prepared by the invention is more efficient in deodorization effect, meanwhile, the effective component limonene is more stable and long-acting, and the three technical bottleneck defects of the limonene deodorant exposed in an actual garbage treatment scene are overcome.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection chemistry, and in particular to a natural deodorant with limonene as the main component, which is suitable for quickly removing ammonia (NH3), hydrogen sulfide (H2S) and other malodorous gases in places such as garbage rooms and sewage treatment plants. Background Art

[0002] The foul-smelling gases produced by modern municipal waste treatment systems (including transfer stations, composting facilities, and landfills) have become persistent environmental pollutants with complex compositions and significant hazards. The aerobic composting process of food waste primarily produces malodorous substances such as ammonia (NH3), hydrogen sulfide (H2S), and volatile organic compounds (VOCs). NH3, due to its high water solubility, easily forms an ammonia-rich environment, causing strong irritation to the eyes and respiratory tract; while H2S, even at ppb concentrations, can induce a "rotten egg"-like sensory aversion. More notably, hydrophobic VOCs such as α-pinene released from landfills have been shown to pose a potential carcinogenic risk.

[0003] Current commercial waste deodorization technologies mainly rely on two methods: chemical oxidation and odor masking, both of which have significant drawbacks:

[0004] (1) Chemical oxidation deodorant

[0005] Strong oxidants such as sodium hypochlorite (NaClO) and hydrogen peroxide achieve deodorization by destroying the molecular structure of odors. Although the H2S removal rate can reach over 90%, its strong corrosiveness shortens the equipment life by 40%-60%. More seriously, sodium hypochlorite reacts with organic sulfur compounds to produce chlorinated hydrocarbon byproducts (such as chloroform and dichloromethane), which are classified as Class 2B carcinogens by the WHO. Field application data shows that the chloride ion concentration in the soil around garbage transfer stations using sodium hypochlorite for deodorization exceeds the standard by 8 times, confirming that there is a serious risk of groundwater contamination.

[0006] (2) Synthetic fragrance masking method:

[0007] These products mask odors by releasing synthetic fragrance molecules like phenylethyl alcohol and benzyl acetate. While this temporarily improves the odor environment, it fails to eliminate malodorous substances. Long-term exposure to fragrance solvents (such as diethyl phthalate) can induce contact dermatitis and respiratory allergies. More critically, these products remove less than 15% of NH3, the primary odor component of landfills, requiring frequent spraying (2-4 times per day), significantly increasing operating costs.

[0008] Due to environmental concerns, plant extracts, such as limonene, are becoming an alternative to chemical deodorants. Limonene, a natural monoterpene, is widely found in citrus peel essential oils, with concentrations reaching 80%-95%. The cyclic olefins in its molecular structure give it unique advantages:

[0009] - Biological activity: inhibits bacteria by destroying microbial cell membranes and reduces odors produced by organic matter decomposition;

[0010] - Penetration enhancement: accelerates the embedding and decomposition of hydrophobic VOCs (such as toluene and xylene);

[0011] - Environmentally friendly: naturally degrades into CO2 and H2O in the environment, with no residual toxicity;

[0012] The Flavor and Extract Manufacturers Association (FEMA) has confirmed its safety for consumption, making it safe for use in food factory waste disposal systems. Experiments have shown that a deodorant containing 10% limonene can remove 89.7% of H2S over a 24-hour period, significantly outperforming most synthetic deodorants.

[0013] Despite its environmental advantages, limonene has three major technical bottlenecks in actual waste treatment scenarios:

[0014] (1) Low ammonia removal efficiency:

[0015] Limonene molecules lack polar functional groups, making it difficult to effectively react with the highly polar NH3. Studies have shown that its adsorption capacity for NH3 is only 0.8-1.2 mg / g, far lower than that of activated carbon (35 mg / g). The root cause is:

[0016] - Ammonia molecules form NH4 in aqueous solution + , which needs to rely on hydrogen bonding or ion exchange mechanisms for capture;

[0017] -The non-protonated nature of limonene does not provide binding sites;

[0018] This results in an NH3 removal rate of less than 30% in actual garbage composting, which is difficult to meet the needs of high ammonia environments.

[0019] (2) Insufficient oxidation stability:

[0020] The olefin double bond in the limonene structure is susceptible to photooxidation attack, triggering a self-oxidation chain reaction:

[0021] Limonene + O2 → Carveol + Carvone + epoxide;

[0022] Oxidation products not only lose their deodorizing activity but also produce a pungent odor. Accelerated testing shows that unprotected limonene solutions lose 62.3% of their active ingredient after 14 days at 40°C. This results in a product shelf life typically shorter than six months, significantly increasing supply chain costs.

[0023] (3) Short duration of action:

[0024] Due to its high volatility (boiling point 176°C) and low water solubility (13.8 mg / L), traditional spray-type limonene preparations remain on the surface of garbage piles for less than two hours. Maintaining deodorization requires four to six sprays per day, significantly increasing labor costs. While existing sustained-release technologies (such as gel carriers) extend this to five to eight hours, they still cannot cover the 8-12 hour operation cycle of a waste treatment plant.

[0025] To this end, we have solved the above technical defects by compounding citric acid, antioxidants and activation systems. Summary of the Invention

[0026] The purpose of the present invention is to solve the technical bottlenecks of limonene in actual garbage disposal scenarios in the prior art, including low ammonia removal efficiency, insufficient oxidative stability, and short action time, and to provide an efficient, long-lasting and safe natural deodorant that targets the removal of hydrogen sulfide and ammonia, while being able to delay the oxidative degradation of limonene and improve its oxidative stability.

[0027] In order to achieve the above object, the present invention adopts the following technical solutions:

[0028] A natural deodorant based on limonene, comprising the following components in percentages by weight:

[0029] Limonene 60-70%,

[0030] Refined pine oil 20-30%,

[0031] cedarwood oil 3-5%,

[0032] 3-5% edible alcohol,

[0033] Antioxidants 0.05-0.1%

[0034] Citric acid 1-2%,

[0035] Activator 0.05-5%.

[0036] Among them, limonene is the main deodorizing component and dissolves hydrogen sulfide;

[0037] Refined pine oil synergistically inhibits bacteria and prolongs the duration of action;

[0038] Citric acid neutralizes nitrogen to form ammonium citrate;

[0039] As a further embodiment of the present invention, the antioxidant is vitamin E or BHT to prevent limonene from oxidizing;

[0040] As a further embodiment of the present invention, the activator is a nonionic surfactant or a metal chelating agent to enhance the reaction efficiency;

[0041] As a further embodiment of the present invention, the activator is Tween 80.

[0042] A method for preparing the above-mentioned natural deodorant based on limonene comprises the following steps:

[0043] (a) Mixing oil phase ingredients: Mix limonene, refined pine oil and cedar oil in a light-proof container;

[0044] (b) dissolving citric acid and antioxidant: adding citric acid and antioxidant to the oil phase components mixed in step (a) above, and stirring until completely dissolved;

[0045] (c) Adding edible alcohol and an activator: slowly adding the edible alcohol and the activator to the liquid completely dissolved in the above step (b), homogenizing, filtering and packaging to obtain the natural deodorant.

[0046] As a further embodiment of the present invention, the antioxidant in step (b) is vitamin E or BHT;

[0047] As a further embodiment of the present invention, the activator in step (c) is a nonionic surfactant or a metal chelating agent;

[0048] As a further embodiment of the present invention, the metal chelating agent is tetrasodium glutamate diacetate GLDA or trisodium methylglycine diacetate MGD.

[0049] As a further embodiment of the present invention, the activator in step (c) is Tween 80.

[0050] Beneficial effects

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] (1) High-efficiency deodorization: limonene reacts with hydrogen sulfide to generate sulfide, and citric acid fixes ammonia, achieving dual-target high-efficiency deodorization, with an ammonia removal rate of ≥95%, an increase of more than 50%;

[0053] (2) Stable and long-lasting: Antioxidants delay the decomposition of active ingredients, and the stability at room temperature is ≥12 months, which more than doubles the shelf life; after 3 months, the limonene content decreases to only about 1 / 3 of the previous level.

[0054] (3) Safe and environmentally friendly: All ingredients are biodegradable and no heavy metal residues are left. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0056] Figure 1 The present invention provides a process flow chart for preparing the above-mentioned limonene-based natural deodorant. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0058] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0059] Comparative Example

[0060] A natural deodorant based on limonene, comprising the following components in percentages by weight:

[0061] Limonene 65%,

[0062] Refined pine oil 25%,

[0063] cedarwood oil 4%,

[0064] Edible alcohol 4%,

[0065] Antioxidants 0%,

[0066] Citric acid 0%,

[0067] Activator Tween 80 2%.

[0068] Reference Figure 1 A method for preparing the above-mentioned natural deodorant based on limonene, without citric acid and antioxidants, eliminating the need for Figure 1 Step (b) comprises the following steps:

[0069] (a) Mixing oil phase ingredients: Mix limonene, refined pine oil and cedar oil in a light-proof container;

[0070] (b) Adding edible alcohol and activator Tween 80: slowly adding edible alcohol and Tween 80 to the liquid completely dissolved in the above step (a), homogenizing, filtering and packaging to obtain the natural deodorant.

[0071] A natural deodorant based on limonene prepared in this control group was subjected to a deodorization test, and the test results showed that the hydrogen sulfide removal rate was ≥95% (within 30 minutes); the ammonia removal rate was only 40%, and the limonene content decreased by 15% after 3 months. The stability of limonene at room temperature was only ≥6 months.

[0072] Example 1

[0073] A natural deodorant based on limonene, comprising the following components in percentages by weight:

[0074] Limonene 65%,

[0075] Refined pine oil 25%,

[0076] cedarwood oil 4%,

[0077] Edible alcohol 4%,

[0078] Antioxidant Vitamin E 0.92%,

[0079] Citric acid 1%,

[0080] Activator Tween 80 0.08%.

[0081] Reference Figure 1 A method for preparing the above-mentioned natural deodorant based on limonene comprises the following steps:

[0082] (a) Mixing oil phase ingredients: Mix limonene, refined pine oil and cedar oil in a light-proof container;

[0083] (b) Dissolving citric acid and antioxidant: Add citric acid and antioxidant vitamin E to the oil phase components mixed in step (a) above, and stir until completely dissolved;

[0084] (c) Adding edible alcohol and an activator: slowly adding edible alcohol and an activator Tween 80 to the liquid completely dissolved in the above step (b), homogenizing, filtering and packaging to obtain the natural deodorant.

[0085] A natural deodorant based on limonene prepared in Example 1 was subjected to a deodorization test, and the test results showed that the hydrogen sulfide removal rate was ≥98% (within 30 minutes), the ammonia removal rate was ≥95%, and the limonene content decreased by only 5% after 3 months. The stability at room temperature was ≥12 months.

[0086] Example 2

[0087] A natural deodorant based on limonene, comprising the following components in percentages by weight:

[0088] Limonene 60%,

[0089] Refined pine oil 30%,

[0090] cedarwood oil 5%,

[0091] Edible alcohol 3%,

[0092] Antioxidant BHT 2,6-di-tert-butyl-4-methylphenol 0.1%,

[0093] Citric acid 1.5%,

[0094] Activator: Tetrasodium Glutamate Diacetate GLDA 0.4%.

[0095] Reference Figure 1 A method for preparing the above-mentioned natural deodorant based on limonene comprises the following steps:

[0096] (a) Mixing oil phase ingredients: Mix limonene, refined pine oil and cedar oil in a light-proof container;

[0097] (b) Dissolving citric acid and antioxidant: Add citric acid and antioxidant BHT 2,6-di-tert-butyl-4-methylphenol to the oil phase components mixed in step (a) above, and stir until completely dissolved;

[0098] (c) Adding edible alcohol and an activator: slowly adding edible alcohol and an activator tetrasodium glutamate diacetate GLDA to the liquid completely dissolved in the above step (b), homogenizing, filtering and packaging to obtain the natural deodorant.

[0099] A natural deodorant based on limonene prepared in Example 2 was subjected to a deodorization test, and the test results showed that the hydrogen sulfide removal rate was ≥96% (within 30 minutes), the ammonia removal rate was ≥96%, and the limonene content decreased by only 3% after 3 months. The stability at room temperature was ≥12 months.

[0100] Example 3

[0101] A natural deodorant based on limonene, comprising the following components in percentages by weight:

[0102] Limonene 70%,

[0103] Refined pine oil 20%,

[0104] cedarwood oil 3%,

[0105] Edible alcohol 3%,

[0106] Antioxidant Vitamin E 0.05%,

[0107] Citric acid 2%,

[0108] Activator: trisodium methylglycine diacetate MGD 1.95%.

[0109] Reference Figure 1 A method for preparing the above-mentioned natural deodorant based on limonene comprises the following steps:

[0110] (a) Mixing oil phase ingredients: Mix limonene, refined pine oil and cedar oil in a light-proof container;

[0111] (b) Dissolving citric acid and antioxidant: Add citric acid and antioxidant vitamin E to the oil phase components mixed in step (a) above, and stir until completely dissolved;

[0112] (c) Adding edible alcohol and an activator: slowly adding edible alcohol and an activator, trisodium methylglycine diacetate (MGD), to the liquid completely dissolved in the above step (b), and homogenizing the mixture, filtering, and packaging to obtain the natural deodorant.

[0113] A natural deodorant based on limonene prepared in Example 3 was subjected to a deodorization test, and the test results showed that the hydrogen sulfide removal rate was ≥95% (within 30 minutes), the ammonia removal rate was ≥98%, and the limonene content decreased by only 7% after 3 months. The stability at room temperature was ≥12 months.

[0114] In summary, by comparing the comparative example with Examples 1-3, it can be concluded that:

[0115] The limonene-based natural deodorant and its preparation method disclosed in the present invention achieve dual-targeted, efficient deodorization through limonene and citric acid. Limonene reacts with hydrogen sulfide to form sulfide, and citric acid fixes ammonia, achieving an ammonia removal rate of ≥95%. Compared with deodorization using limonene alone, the ammonia removal rate is increased by more than 50%, while the ammonia removal rate of the comparative example is only 40%.

[0116] At the same time, by adding antioxidants to delay the decomposition of the active ingredient limonene, the limonene content decreased to only about 1 / 3 of the previous level after 3 months, while the limonene content of the control group decreased to 15% after 3 months;

[0117] The stability of limonene at room temperature is ≥12 months, and the shelf life is more than doubled; the stability of limonene in the comparative example at room temperature is ≥6 months.

[0118] In summary, the limonene-based natural deodorant provided by the present invention is safe and environmentally friendly, has high deodorizing efficiency, and is stable and long-lasting, and can enable the larger-scale use of limonene deodorants in actual garbage disposal scenarios.

[0119] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A natural deodorant based on limonene, characterized in that Contains the following components in weight percentage: Limonene 60-70%, Refined pine oil 20-30%, cedarwood oil 3-5%, 3-5% edible alcohol, Antioxidants 0.05-0.1% Citric acid 1-2%, Activator 0.05-5%.

2. A natural deodorant based on limonene according to claim 1, characterized in that, The antioxidant is vitamin E or BHT.

3. The natural deodorant based on limonene according to claim 1, characterized in that: The activator is a nonionic surfactant or a metal chelating agent.

4. A natural deodorant based on limonene according to claim 1 or 3, characterized in that, The activator is Tween 80.

5. A method for preparing a natural deodorant based on limonene according to any one of claims 1 to 4, characterized in that: The following steps are involved: (a) Mixing oil phase ingredients: Mix limonene, refined pine oil and cedar oil in a light-proof container; (b) dissolving citric acid and antioxidant: adding citric acid and antioxidant to the oil phase components mixed in step (a) above, and stirring until completely dissolved; (c) Adding edible alcohol and an activator: slowly adding the edible alcohol and the activator to the liquid completely dissolved in the above step (b), homogenizing, filtering and packaging to obtain the natural deodorant.

6. The method for preparing a natural deodorant based on limonene according to claim 5, characterized in that: The antioxidant in step (b) is vitamin E or BHT.

7. The method for preparing a natural deodorant based on limonene according to claim 5, characterized in that: The activator in step (c) is a nonionic surfactant or a metal chelating agent.

8. A method for preparing a natural deodorant based on limonene according to claim 5 or 7, characterized in that: The activating agent in step (c) is Tween 80.

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