102 results about "Limonene" patented technology

This invention provides a rapid and visual detection method for D-limonene and its application, belonging to the field of analytical chemistry. The method includes: mixing ethanol and water to form a solvent system, sequentially adding template agents Pluronic P123 and Pluronic F127, phloroglucinol, 1,3,5-trimethylbenzene, and ethylenediamine, and stirring at room temperature until homogeneous; after the reaction is complete, washing, centrifuging, drying, and calcining to obtain DNCzyme; adding TMB, H2O2, and DNCzyme to an acetate-sodium acetate buffer solution HAc-NaAc, and finally adding D-limonene, incubating, and then visually detecting the solution. The colorimetric sensing method for detecting D-limonene provided by this invention is rapid, simple, low-cost, highly sensitive, and selective, and can be visualized using a smartphone.

The invention relates to the technical field of cleaning tablets, and provides a multi-effect cleaning tablet for a kitchen waste processor and a preparation method of the multi-effect cleaning tablet. The multi-effect cleaning tablet comprises a foaming cleaning layer, an oxidation sterilization layer and a deep decomposition layer, the foaming cleaning layer is arranged on one side of the oxidation sterilization layer, the deep decomposition layer is arranged on the opposite side of the oxidation sterilization layer, and the foaming cleaning layer comprises sodium bicarbonate, gluconic acid-delta-lactone, alkyl glycoside, limonene and a chelating agent; the oxidation sterilization layer comprises sodium percarbonate, potassium hydrogen peroxysulfate, potassium carbonate, sodium citrate and a stabilizer; the deep decomposition layer comprises biological enzyme. Gluconic acid-delta-lactone is adopted in the foaming cleaning layer of the multi-effect cleaning tablet to generate gluconic acid, so that the system is prevented from instantly and violently turning over, a middle-layer peroxidation system is favorably released at a proper time, invalid decomposition is reduced, strong acid or violent pH fluctuation is prevented from permeating into an inner layer, the enzyme inactivation risk is reduced, the foaming process is mild, and the foaming effect is good. And the integral integrity of the tablet can be maintained.

The application discloses a high-efficiency paint-removing liquid, a preparation method thereof and a wet wipe, wherein the high-efficiency paint-removing liquid comprises, in terms of mass fractions, an alcohol ether solvent, N,N-dimethyl-9-decenamide, an emulsifier, a penetrating agent, a humectant, limonene and a preservative; the alcohol ether solvent is used to improve the polarity of the whole system, can soften and swell the paint film well, and reduce the adhesion of the paint film to a base material; the N,N-dimethyl-9-decenamide is used as a main surface-active paint remover, and the penetrating property of the N,N-dimethyl-9-decenamide can make the paint molecular chain break, so that the paint molecular structure is decomposed; the alcohol ether solvent and the N,N-dimethyl-9-decenamide can cooperate to make the paint layer easy to peel off; the penetrating agent is further used to enhance the emulsification and dispersion of the paint, help the softened and decomposed paint particles stably disperse in the solution, prevent the paint particles from being redeposited, and facilitate subsequent cleaning and removal; and the limonene is used as a complexing agent and cooperates with other components to realize the high-efficiency and thorough paint-removing effect.

The invention provides a mild refreshing borneol essential oil compound as well as a preparation method and application thereof. The borneol essential oil compound is prepared from the following components in parts by weight: 1 to 50 parts of borneol, 0.1 to 50 parts of menthol, 1 to 10 parts of natural camphor, 0.1 to 0.5 part of herba dendrobii essential oil, 35 to 70 parts of carrier oil, 0.2 to 1 part of vitamin E, 1 to 3 parts of eudesmol, 0.2 to 1 part of limonene and 0.5 to 5 parts of cinnamomum camphora essential oil clathrate compound. The borneol essential oil compound prepared by the invention has the advantages of better stability, high essential oil retention rate, freshness and durability, mild components without skin irritation, and refreshing effect, and can be applied to preparation of products such as snorting essential oil, roll-on essential oil or vehicle-mounted fragrance and the like.

The invention discloses a peach ketone synthesis method, which relates to the technical field of essence and perfume synthesis, and comprises the following steps: adding cyclopentanone and glacial acetic acid into a reaction container, starting stirring, adding manganese acetate (II) and cobalt acetate (II), and then adding acetic anhydride; introducing dried air below the liquid level, heating to 80-100 DEG C, dropwise adding D-limonene, and carrying out a heat preservation reaction after dropwise adding is finished; gC monitors the reaction endpoint, and the reaction is stopped when the product purity of the reaction liquid is not increased any more; after the reaction is finished, filtering, carrying out reduced pressure distillation to recover cyclopentanone, glacial acetic acid and unreacted D-limonene, after the recovery is finished, adding methanol and n-heptane into kettle liquid, carrying out water extraction, washing and liquid separation, washing an organic phase with a sodium bicarbonate aqueous solution, carrying out reduced pressure distillation on the organic phase to recover n-heptane, and after the recovery is finished, obtaining a peach ketone crude product; and carrying out crude drawing and rectification on the peach ketone crude product to obtain a peach ketone finished product. The method has the advantages of mild reaction conditions, low safety risk and few three wastes, and can obtain a high-purity peach ketone finished product.

The application relates to the technical field of paper wet strength agent, and discloses a high-solid-content wet strength agent and a preparation method thereof. The preparation method comprises the following steps: reacting a dibasic acid and a dibasic amine under the action of an acid catalyst to obtain a polyamide prepolymer; after the polyamide prepolymer is cooled, deionized water is added to adjust the solid content, then allyl glycidyl ether, limonene, organic modified montmorillonite and an initiator are added, and a polyamide intermediate is obtained through reaction; the polyamide intermediate is cooled to room temperature, and epichlorohydrin is added dropwise, and after reaction at room temperature, the temperature is increased for reaction, and the solid content is adjusted, and the high-solid-content wet strength agent is obtained. After the limonene in the wet strength agent is grafted, hydrophobic microzones are formed in the polymer network, the combination and penetration capacity of water molecules, paper fibers and the wet strength agent can be reduced, the wet resistance and wet strength of paper can be improved, and the organic modified montmorillonite can form synergy with the hydrophobic microzones constructed by the limonene, so that the wet strength and wet resistance of the wet strength agent are further improved.

This invention discloses a multi-target synergistic preservation method for fruits and vegetables based on the active ingredients of Torreya grandis aril, belonging to the field of fruit and vegetable preservation technology. The method includes the following steps: Step 1: Using Torreya grandis aril as raw material, Torreya grandis aril essential oil is extracted by steam distillation. This multi-target synergistic preservation method for fruits and vegetables based on the active ingredients of Torreya grandis aril combines four active ingredients—3-carene, D-limonene, δ-juniperol, and δ-juniperene—from the Torreya grandis aril essential oil with chitosan to construct an integrated synergistic preservation system of "antioxidant—enzyme inhibition—film protection—antibacterial action." This system protects the integrity of fruit cell membranes and delays softening and water loss, thereby overcoming the shortcomings of existing technologies that are single-function and unstable in effect. It achieves precise, multi-target intervention across the entire chain of postharvest physiological decline in perishable fruits and vegetables.

The present invention relates to mixtures comprising limonene and fungicides and methods to protect plants using such mixtures.

The objective is to provide a fragrance composition that has high reproducibility of the fragrance of forsythia flowers and excellent palatability. [Solution] The forsythia flower fragrance composition comprises (A) methyl salicylate and / or ethyl salicylate, (B) methyl benzoate and / or ethyl benzoate, and (C) linalool and / or limonene, wherein the total content of component (A) and component (B) is 50 to 90% by mass, and the mass ratio (A / B) is 1 to 10.

The invention relates to a rust removal lubricant for metal and a preparation method of the rust removal lubricant, and belongs to the technical field of metal rust removal and corrosion prevention. The rust removal lubricant for the metal comprises a linoleic acid modified resin acid derivative, a quaternary ammonium salt modified montmorillonite-vegetable oil compound, a quaternized lignin derivative, d-limonene, epoxidized soybean oil, maleic anhydride modified tung oil, benzotriazole, a nonionic surfactant, a pH buffer system and deionized water. Through the molecular design and synergistic effect of core components such as the linoleic acid modified resin acid derivative, the quaternary ammonium salt modified montmorillonite-vegetable oil compound, the quaternized lignin derivative and the d-limonene, excellent permeability, rapid rust removal capacity and long-acting lubricating and anti-rust performance are achieved; the metal rust remover can be widely applied to rust removal, lubrication and protection of metal products such as mechanical equipment, automobile parts and hardware tools, the service life of the metal parts is prolonged, meanwhile, bio-based raw materials are adopted, the VOC content is low, and the environment-friendly requirement is met.

This invention provides an aqueous dewaxing reagent comprising the following components by weight percentage: 0.3-6% surfactant and 0.5-3% composite penetration enhancer, with the balance being water. The composite penetration enhancer is composed of limonene and terpineol, wherein the mass of terpineol is not less than 10% of the total mass of the composite penetration enhancer. The preparation method involves mixing the surfactant, composite penetration enhancer, and water. This invention utilizes a composite penetration enhancer composed of limonene and terpineol, which significantly improves dewaxing speed, reduces temperature dependence, widens the operating temperature window, reduces tissue damage, provides better protection against antigens, and is beneficial for IHC staining.

The invention discloses a preparation method of grapefruit lip balm, belongs to the technical field of cosmetics, and aims to solve the problems that the lip balm is insufficient in thin coating protection, sticky and easy to fall off and the like in winter in northern China, and the method comprises the following steps: mixing edelweiss extract coated microspheres, 5-6 parts of grapefruit essential oil modified precursor, shea butter, jojoba oil, microcrystalline wax and limonene; fully stirring to obtain an oil phase; adding sodium hyaluronate, vitamin E and grapefruit seed protein into deionized water, stirring and dissolving, heating to 50-60 DEG C, adding papain, and fully stirring to obtain a water phase; and pouring the water phase into the oil phase, fully stirring to form an emulsification system, naturally cooling, refrigerating and shaping to obtain a finished product. The lip balm prepared by the invention can realize long-acting moisturizing and anti-shedding in a thin coating state, has anti-allergy and soothing effects, is excellent in temperature change stability, and meets the use requirements of northern areas in winter.

The invention provides a formula of refreshing essential oil containing blended bergamot and orange peel oil, and relates to the technical field of essential oil preparation. The invention discloses refreshing essential oil and a preparation method thereof, and aims to solve the technical problem that existing refreshing essential oil is difficult to consider safety, functionality and use convenience at the same time. The formula comprises the following components in parts by weight: core components: 3-12 parts of bergamot oil, 5-15 parts of orange peel oil, 60-85 parts of base oil, 0.5-3 parts of rosemary essential oil which can optionally contain a synergistic component, and 0.1-0.8 part of an antioxidant which is an auxiliary material. Wherein the bergamot oil is extracted by cold pressing, the temperature is less than or equal to 30 DEG C, impurities are less than or equal to 0.5%, and linalyl acetate is more than or equal to 35%; the orange peel oil is filtered after cold pressing, the impurity content is less than or equal to 0.3%, and the limonene content is more than or equal to 90%; the acid value of the base oil is less than or equal to 1.0 mgKOH / g, and the peroxide value is less than or equal to 5.0 meq / The preparation process comprises the steps of raw material pretreatment, component mixing, ultrasonic emulsification, standing and filtering. The product is suitable for office and driving scenes, the release half-life period of volatile components is 4-6 h, the product does not contain artificially synthesized essence, and the peak value ratio of limonene to linalyl acetate detected by gas chromatography is 2.5-4.0.

A reaction device for preparing terpineol from limonene and a synthesis method thereof are provided. The reaction device is provided with an evaporator, a reactor, a condenser, a catalyst basket, a steam riser and a siphon. The evaporator is provided with a raw material inlet and a discharge outlet. The upper portion of the evaporator is connected with the upper portion of the reactor through the steam riser. The condenser is arranged at the top of the reactor. The catalyst basket is arranged in the reactor. The siphon is connected with the reactor and the evaporator respectively. The evaporator is heated. The raw material, water and solvent are evaporated through the steam riser and condensed in the condenser. The condensed liquid is reacted with the catalyst. When the liquid level in the reactor is higher than the height of the siphon, the liquid in the reactor is returned to the evaporator by the pressure difference. The raw material, water and solvent in the evaporator are continuously evaporated and reacted. The process is repeated. After the reaction is completed, the heating is stopped, the discharge outlet is opened, the discharged material is separated by rectification, and terpineol is obtained. The reaction synthesis of terpineol from limonene is easy for subsequent rectification and separation, the reaction time is short, and the process is simple.

This application relates to the field of marine-source polyvinyl chloride (PVC) waste treatment technology, specifically disclosing a phase-separation type organic solvent and a treatment process for marine-source PVC foam waste. The phase-separation type organic solvent includes a dissolving phase, a desalting phase, and a phase stabilizer. The dissolving phase includes limonene and p-methoxycyclohexanone. The desalting phase is a saturated diol. The phase stabilizer is tributyl phosphate. The dissolving phase is responsible for dissolving the PVC foam, the desalting phase is responsible for adsorbing the water and salt carried in the foam, and the phase stabilizer ensures a clear, non-emulsifying interface between the two phases. The three phases work synergistically to achieve simultaneous dissolution, desalination, and phase separation, and the regenerated PVC has extremely low salt content, eliminating the need for a water washing desalination step, thus reducing the generation and discharge of high-salt wastewater.

The invention belongs to the technical field of cleaning agents, and discloses a heavy-duty cleaning agent as well as a preparation method and application thereof. The problem that an existing industrial cleaning agent cannot achieve high cleaning capacity and safety and environmental protection at the same time is effectively solved. The cleaning agent comprises the following components in percentage by mass: 20-35% of dipropylene glycol monomethyl ether; 20%-30% of D-limonene; 5%-15% of propylene carbonate; 8%-15% of alkyl glycoside; 3%-8% of isomeric tridecane alcohol ether; 0%-1% of monoethanolamine; 3%-8% of an alcohol conditioning agent, wherein the alcohol conditioning agent is isopropanol or ethanol; and the balance of deionized water. The cleaning agent can be used for cleaning PVC paste, cured resin, deposited carbon, grease and mixed oil sludge dirt attached to the surfaces of industrial equipment, mechanical parts, plastic molds, vehicle engines and the like. The cleaning agent has excellent heavy dirt cleaning capability, environmental protection and safety characteristics, material compatibility and use economy.

The invention discloses ethanol-free perfume based on low-volatility ionic liquid and a preparation method of the ethanol-free perfume, and belongs to the technical field of perfume. The ethanol-free perfume provided by the invention is prepared from the following components in parts by mass: 60 to 70 parts of ionic liquid, 8 to 12 parts of phenethyl alcohol acetoacetate, 12 to 17 parts of vetimol-citric acid mixed anhydride, 3 to 7 parts of microencapsulated limonene, 4 to 6 parts of a humectant and 0.2 to 0.7 part of an antioxidant. The preparation method comprises the following steps: firstly, mixing the ionic liquid, the humectant and the antioxidant to obtain a carrier phase, then adding the phenethyl alcohol acetoacetate and the vetimol-citric acid mixed anhydride into the carrier phase, mixing, finally adding the microencapsulated limonene, mixing to form a suspension system, curing and filtering. According to the perfume provided by the invention, ethanol is replaced by choline-proline ionic liquid, so that the problems of dry skin, irritation and allergy caused by ethanol are avoided, and essence molecules are modified, so that the perfume has the performance of lasting fragrance.

The present application provides a heavy crude oil efficient wax removal and prevention agent and a preparation method thereof, and belongs to the technical field of oil field chemistry, and comprises the following steps: step S1, surface modification of hollow mesoporous silica microspheres by KH-570 to obtain a carrier with a methacrylate double bond on the surface; step S2, preparation of a composite carrier with a surface grafted copolymer layer; step S3, preparation of an amphoteric functionalized composite carrier; and step S4, D-limonene loading of the amphoteric functionalized composite carrier to obtain a heavy crude oil efficient wax removal and prevention agent. The present application can solve the problems of the prior art, such as the difficulty in simultaneously achieving wax removal and prevention, the insufficient release sustainability of active components, and the poor dispersion stability in complex oil phases.

The present invention provides a repellent composition for mites which is excellent in mite-repelling effect against indoor mites even after a long period of time and is also excellent in safety to humans and animals. The present invention relates to a repellent composition for mites, which contains: (a) 1,8-cineol and / or 1,4-cineol and (b) a perfume ingredient, wherein the perfume ingredient contains one or two or more kinds of perfume compounds having a logP value of 2.0 to 5.5. The mixing ratio (a) / (b) of the (a) ingredient to the perfume compounds contained in the (b) ingredient is set to 5 to 100 on a mass basis. The perfume compounds contained in the (b) ingredient are at least one selected from the group consisting of ethyl cinnamate, allyl caproate, 3-methyl-5-phenyl-1-pentanol, citronellol, δ-dodecalactone, β-ionone, benzyl benzoate, linalyl acetate, geranyl acetate, tricyclo decenyl propionate, benzyl salicylate, limonene, and amyl salicylate.

The invention discloses limonene detergent processing production equipment which comprises a production equipment body, the production equipment body comprises a processing device body, a detachable auxiliary processing part is arranged on the top of the processing device body, and a first detachable supporting rod and a second detachable supporting rod are arranged between the detachable auxiliary processing part and the production equipment body. The device has the beneficial effects that the structure is compact, the working intensity of workers is reduced, and the extraction and production efficiency of the limonene cleaning agent is improved.

The invention provides an efficient paraffin remover and inhibitor for heavy crude oil and a preparation method thereof, and belongs to the technical field of oilfield chemistry, and the preparation method comprises the following steps: step S1, carrying out surface modification on hollow mesoporous silica microspheres through KH-570 to obtain a carrier with methacrylate double bonds on the surface; s2, preparing a composite carrier of which the surface is grafted with a copolymerization layer; s3, preparing an amphoteric functional composite carrier; and S4, carrying out D-limonene loading on the amphoteric functionalized composite carrier to obtain the efficient paraffin remover and inhibitor for the heavy crude oil. The problems that in the prior art, paraffin removal and paraffin control are difficult to consider, the release persistence of active components is insufficient, and the dispersion stability in a complex oil phase is poor can be solved.

The application relates to the field of cleaning sprays, in particular to an aerosol type residual glue cleaning agent and a preparation method thereof. The aerosol type residual glue cleaning agent comprises the following components in percentage by mass: 20-35% of toluene, 1-10 of limonene, 0.1-5% of cyclohexanone, 20-35% of a propellant, and solvent supplementing the rest to 100%; the preparation method comprises the following steps: step 1, stirring the solvent, toluene, limonene and cyclohexanone to be uniform to obtain a semi-finished product; and step 2, filling the semi-finished product and the propellant into an aerosol container to obtain a finished product. The cleaning agent is prepared by adopting toluene, limonene and cyclohexanone in cooperation, the cleaning agent has excellent cleaning effect on hard residual glue, and is especially suitable for cleaning of residual glue of a car film. With the improvement of environmental protection consciousness and the development of green chemistry, the efficient cleaning agent has wide market prospects.

The invention discloses aromatic essential oil with carsickness preventing and relieving effects and a preparation method, and relates to the technical field of in-car health, and the aromatic essential oil specifically comprises alpha-pinene, beta-pinene, beta-caryophyllene, limonene, menthol, linalool, ocimene and citronellol. The proportions of the alpha-pinene, the beta-pinene, the beta-caryophyllene, the limonene, the menthol, the linalool, the ocimene and the citronellol are respectively 15 to 25 percent, 15 to 25 percent, 15 to 25 percent, 10 to 20 percent, 10 to 20 percent, 5 to 10 percent, 5 to 10 percent and 8 to 15 percent. Essential oil is adsorbed to pores of the ceramic rod in a vacuum impregnation or low-pressure pressurization impregnation mode, deep penetration of the essential oil on the ceramic rod is promoted, the fragrance carrying amount of the ceramic rod per unit is increased, fragrance release is more uniform and lasting, and therefore the fragrance carrying amount and uniformity are improved.

Disclosed in the present invention are a chiral azobenzene polymer crosslinked thin film and preparation method therefor and application thereof. The present invention relates to a novel super-molecular chiral construction and chiral immobilization method based on an achiral side chain type azobenzene polymer thin film. According to the present invention, limonene steam is utilized to perform chiral induction on a polymer thin film at a high temperature, and then formaldehyde steam is utilized to perform acetal reaction with hydroxyl in an acidic environment to achieve crosslinking; and then differences in the stability of the super-molecular chirality of the polymer thin film before and after crosslinking is studied under the conditions of light, heat and good solvent dissolution, and the self-repairing properties of microcosmic helical chirality is researched. The crosslinked thin film prepared by the present invention has good chiral properties, and excellent solvent resistance, heat resistance, and self-repairing properties.

The application belongs to the field of chemical materials, and particularly relates to a composite material with high wetting and application thereof, and more particularly relates to a composite material containing a surfactant, the composite material comprising the following components: component A and component B; wherein the component A is a surfactant, preferably a biosurfactant, and is specifically selected from sophorolipid, sodium lauroyl glutamate, sodium cocoyl glycinate, NP-7, NP-9, NP-10, NSS or Triton X100; and the component B is selected from limonene, sweet orange essential oil, dried tangerine peel essential oil, pine essential oil or limonene. Through wetting force performance testing on the composite material, under the special properties of the sophorolipid surfactant and through the joint action with reagents, obvious wetting force improvement can be detected.

This invention discloses a car care-based cleaning fluid and its preparation method, comprising the following raw materials by mass percentage: 10-18% composite surfactant, 5-9% modified polydimethylsiloxane, 4-7% carnauba wax-based particles, 3-6% modified diatomaceous earth, 2.5-5% hydrogenated castor oil, 2-4.5% polyethylene glycol, 1-2% limonene, and the remainder being water. The car care-based cleaning fluid prepared by this invention can effectively remove dirt and improve cleaning results, while also enhancing gloss and scratch resistance, and simultaneously improving stain resistance and self-cleaning properties.

The present application relates to a kind of high-efficiency oil sludge separating agent, preparation method and its application in oil sludge cleaning.The high-efficiency oil sludge separating agent includes the following weight parts of component, coconut oil diethanolamide 25-45 parts, sulfonated succinic acid dioctyl ester sodium salt 15-25 parts, sodium dodecyl sulfate 3-10 parts, propylene glycol 1-5 parts, alpha-pinene or limonene 3-10 parts, alpha-terpineol or menthol 3-10 parts, acetyl linaloe 3-8 parts, citral 1-5 parts, water 15-25 parts.The application of the high-efficiency oil sludge separating agent in oil sludge cleaning includes the following steps, S1, oil sludge and agent are loaded into first container;S2, add cleaning water, keep the temperature of mixed solution at 50-70 DEG C, use stirrer to carry out high-speed shearing stirring, stirring speed is above 3000r / min;S3, after stirring, mixed solution is transferred to second container, continue to add cleaning water;S4, continue to stir, stirring speed is above 100r / min.The present application has good oil sludge separation efficiency.

The present application provides a pesticide bactericide containing d-limonene, the active ingredient of the pesticide bactericide is d-limonene and copper oxide, and the mass ratio of d-limonene and copper oxide is 7-27:20-44. The present application selects d-limonene and copper oxide for compounding, and the two can produce a synergistic effect, thereby making the prepared pesticide bactericide have good bacteriostatic and bactericidal effects, and have a larger control spectrum, especially for wheat basal stem rot. And the test crop wheat is safe, and no phytotoxicity symptoms are found.

The invention discloses a method for extracting polysaccharide from selenium-rich rhodopseudomonas palustris fermentation broth, and belongs to the technical field of microbial fermentation engineering and biotechnology application. S2, decoloring: decoloring the primary concentrated solution by using a d-limonene and ethyl acetate mixed system under the action of aminated silicon dioxide nanoparticles to obtain a colorless and transparent polysaccharide solution; s3, precipitation and impurity removal: adding an organic acid salt composed of magnesium citrate and ferrous malate, stirring, adjusting the pH value to 4.5-5.5, reacting, and centrifuging to remove the precipitate; s4, desalting and purifying; and S5, drying. According to the method, the use of high-concentration ethanol is avoided in the whole process, the organic solvent residue in the product is extremely low, and multiple beneficial effects of zero alcohol precipitation, zero inorganic selenium residue, high polysaccharide yield and extremely high product purity are realized in the field of selenium-rich polysaccharide extraction for the first time; and reliable and irreplaceable technical support is provided for developing safe and efficient selenium-rich polysaccharide functional food.

This invention discloses a method for extracting limonin, comprising the following steps: S1, preparing an extract containing limonin; S2, adding macroporous resin to the extract and stirring, the macroporous resin being used to adsorb limonin in the extract; S3, removing the macroporous resin from the extract and placing it in a chromatography column to collect the eluent; S4, evaporating and concentrating the eluent to obtain a limonin extract, using ethyl acetate as a washing solvent, ultrasonically dissolving the limonin extract, then adding pure water for washing, concentrating and evaporating the washing solution to obtain a limonin sample; S5, performing TLC directional analysis on the limonin sample to check whether the limonin sample is qualified. This invention improves the extraction rate of limonin and yields a high extraction content.