Method for reducing use amount of ethanol produced from citrus fibers

Abstract

The invention relates to the technical field of food processing, and provides a method for reducing the use amount of ethanol produced from citrus fibers. Mixing the wet fiber component C with 75%-85% ethanol according to the mass ratio of 1: 1, adding hydrophobic nano silicon dioxide accounting for 1%-3% of the mass of the wet fibers, dispersing and mixing at a high speed by using a colloid mill to gradually flocculate and precipitate the fibers, and discharging an upper-layer mixed solution of ethanol and water; adding 0.5-0.7 time of 95% ethanol into the precipitate, putting the precipitate into an ultrasonic reactor, and treating for a preset time under the conditions that the frequency is 30-50kHz and the power density is not lower than 1W / L to remove the nano silicon dioxide, so as to obtain a precipitate D; and squeezing and dealcoholizing the precipitate D material to obtain the finished product citrus fiber. According to the method, the hydrophobicity is increased by the silicon dioxide nanoparticles so as to reduce the water absorption rate of the fiber, and the ethanol consumption is greatly reduced during the production of the citrus fiber.

Description

Technical Field

[0001] The invention relates to the technical field of food processing, and in particular to a method for reducing the amount of citrus fiber used in producing ethanol. Background Art

[0002] Citrus fiber is a specialty dietary fiber product developed in recent years. It has good water absorption, thickening, emulsification and stabilization capabilities and is widely used in the food industry. The production of citrus fiber mainly involves physical, chemical or biological methods to remove pectin and lignin, such as organic solvents, hydrocolloids, enzymatic hydrolysis, acid-base treatment and microbial fermentation, so as to obtain wet fiber components with higher purity. In order to obtain the final citrus fiber raw material suitable for food or other functional products, the wet fiber usually needs to be washed with alcohol, precipitated and dried. In this process, the amount of ethanol used is extremely large. It first absorbs and replaces the water in the wet fiber, and then is squeezed and dried to remove it. This step not only affects the yield and structural integrity of the fiber, but also directly determines its functional properties and terminal application performance.

[0003] Due to its unique physical and chemical properties, ethanol is used in the aforementioned process for rapid fiber dehydration. This method efficiently removes moisture at low temperatures, reducing the risk of thermal degradation at high temperatures and helping to remove non-fibrous impurities, thereby improving product purity. However, ethanol dehydration has numerous limitations in practical applications. Firstly, the high ethanol consumption (over 2-3 tons per ton of citrus fiber produced) poses a challenge to industrial production due to its high cost. Secondly, its high volatility poses operational safety risks and can easily cause environmental pollution. Therefore, reducing ethanol use is an urgent issue in current product production.

[0004] In view of this, overcoming the defects of the prior art is an urgent problem to be solved in this technical field. Summary of the Invention

[0005] The technical problem addressed by the present invention is that the existing citrus fiber production process often uses ethanol to absorb and displace moisture from the wet fibers, and then squeezes and dries the ethanol to remove it. However, this process results in high ethanol usage, high costs, poor safety, and environmental pollution. There is an urgent need to develop a method that can reduce the amount of ethanol used in citrus fiber production, thereby achieving efficient, safe, and environmentally friendly citrus fiber production.

[0006] Step 1: Pretreatment of citrus raw materials and auxiliary materials: Citrus peel residue is crushed into 40-60 mesh powder, and the mixture is allowed to stand for 12-24 hours at a material-liquid ratio of 1:40 to fully hydrate the fiber to obtain a mixture A. The citrus peel residue includes grapefruit peel, lemon peel, orange peel and other citrus peel residues.

[0007] Pretreatment of auxiliary material calcium carbonate: The calcium carbonate raw material is ground in a vertical mill to a particle size d≤2μm. The surface is then coated with stearic acid (1.5% to 3% by mass of the calcium carbonate) at 80-120°C and stirred at high speed for 30-60 minutes to obtain modified calcium carbonate. The particles are further refined in a vertical mill and coated with stearic acid to improve their dispersibility and compatibility. (This reduces hydrophilicity, making it easier to disperse in the system. The steric hindrance or electrostatic repulsion of the surface modifier inhibits interparticle aggregation and enhances interfacial bonding. The active groups of the modifier (such as carboxyl and amino groups) can form chemical bonds or hydrogen bonds with polymer chains, improving the mechanical properties of the composite material (such as tensile strength and impact toughness). Step 2: High shear treatment: The mixture A is homogenized by high shear, ball milling, colloid milling, ultrahigh static pressure or high-pressure micro-jetting. During this process, 0.2-1% of the weight of citrus peel residue modified calcium carbonate is added in stages, and slurry B is obtained after efficient dispersion treatment.

[0008] Step 3: Alkali leaching of fibers: The resulting slurry B is immersed in a 5-10% NaOH solution, maintaining a pH of no less than 10. The treatment temperature is maintained at 80-95°C for 60-120 minutes. Mechanical stirring (50-100 rpm) is maintained during the treatment to ensure uniform treatment. The fiber precipitate is separated by centrifugation, and 5-10% citric acid (or 5-10% dilute acetic acid) is added to the precipitate to remove calcium carbonate (citric acid, as a weak organic acid, reacts with calcium carbonate to form soluble calcium citrate, water, and carbon dioxide). Finally, the fiber precipitate is washed with deionized water until neutral, thereby obtaining a relatively high-purity wet fiber component C.

[0009] This process disrupts the binding structure of cellulose, hemicellulose, and lignin in citrus fiber, removing impurities such as hemicellulose and lignin, improving fiber purity and reactivity, and increasing the fiber's water and oil absorption capacity while maintaining the integrity of the fiber structure. The treated fiber yield can reach over 85%, with the cellulose content increasing to over 90%.

[0010] Step 4, alcohol washing: Mix the wet fiber component C with 75-95% ethanol at a mass ratio of 1:1, add 0.25-1.5% of the wet fiber mass of hydrophobic nano-silica, use a colloid mill to disperse and mix at high speed, so that the fiber gradually flocculates and precipitates, and discharge the upper layer of ethanol and water mixture.

[0011] The precipitate was further added with 0.5-0.8 times 95% ethanol and placed in an ultrasonic reactor at a frequency of 20-40 kHz and a power density of not less than 1 W / L for 10-30 min to remove the nano-silica. The clear liquid was removed to obtain precipitate D.

[0012] Hydrophobic SiO2 preferentially adsorbs on the crystalline surfaces of cellulose, where it covers polar -OH groups through supramolecular interactions, reducing water binding sites while shortening the interplanar spacing of cellulose crystals and inhibiting water penetration. Nano-SiO2 forms a highly porous hydrophobic layer on the fiber surface, exhibiting stable hydrophobicity (pH 2-13 tolerance). Its organically modified long chains (e.g., alkyl groups) hinder water adsorption, while the high-modulus SiO2 enhances the density of the fiber network and reduces hydrophilic channels. Micellar dispersion (e.g., self-assembly in water) further optimizes the uniformity of the hydrophobic coverage. Nanocellulose in the wet fiber component promotes directional SiO2 adsorption, enhancing hydrophilic group shielding and interplanar spacing at the supramolecular scale, synergistically reducing water retention. The study found that: Preparation of reversible superhydrophobic / superhydrophilic silica aerogel: Under mild conditions (80°C), through solvent exchange of water and ethanol, the surface groups of silica can undergo reversible esterification reaction: the water environment promotes the formation of silanol (Si-OH), imparting superhydrophilicity; ethanol induces the formation of silanol (Si-OEt), achieving superhydrophobicity.

[0013] Step 5: Pressing and dealcoholization: The precipitated material D was placed on a belt filter press and dealcoholized at a pressure of 0.5-2 MPa for 2-10 min to increase the fiber solid content by more than 20% to obtain material E.

[0014] Step 6: Drying, crushing and packaging: The wet fiber material E is placed in a vacuum hot air drying device and dried at 50-80°C for 30-120 minutes at a vacuum of at least 0.08 MPa to reduce the fiber moisture content to below 10%. The fiber is then graded in an ultrafine grinder to a size of 100 mesh or larger, and finally sealed and packaged in a nitrogen-protected automatic packaging system to produce the finished citrus fiber.

[0015] This paper proposes an innovative citrus fiber production method. By fully dispersing the citrus fiber and then using silica nanoparticles to increase its hydrophobicity and reduce its water absorption, this method reduces the difficulty of ethanol dehydration and significantly reduces ethanol consumption during citrus fiber production. This method helps reduce production costs and improve production safety, providing a new path for the green and sustainable production of citrus fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0017] Figure 1This is an evaluation comparison chart for the methods of Examples 1 to 4 provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] The terms "first," "second," etc., used in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified with "first," "second," etc. may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0020] The present invention proposes a method for reducing ethanol usage in citrus fiber production by using calcium carbonate in conjunction with a hydrophobic material. By using calcium carbonate and silica treatment technology, a hydrophobic material is added after the fiber structure is fully dispersed to reduce the water absorption rate of the fiber. The advantages include: 1. This technology can reduce ethanol usage by 30-40%. Adding hydrophobic substances such as nano-silica to the alcohol wash water can reduce the fiber's water absorption rate and reduce ethanol consumption during washing and dehydration.

[0021] 2. This technology can reduce energy costs by 20-30%. Nano-sized calcium carbonate is fully filled into the hydrated fibers, improving grinding efficiency. Combined with processing aids, it promotes the full dispersion of citrus fibers, facilitates drying, and thus saves drying energy costs.

[0022] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] Example 1: No calcium carbonate dispersion process is used, and no hydrophobic silica is used to reduce fiber water absorption process, including: Step 1: Pretreatment of citrus raw materials and auxiliary materials: Citrus peel residue was crushed into 50 mesh powder, and the mixture was allowed to stand for 24 hours at a material-liquid ratio of 1:40 to fully hydrate the fiber to obtain a mixture A. The citrus peel residue includes grapefruit peel, lemon peel, orange peel and other citrus peel residues.

[0024] Step 2: High shear treatment: The mixture A is homogenized by high shear, ball milling, colloid milling, ultra-high static pressure or high-pressure micro-jetting, and the slurry B is obtained after efficient dispersion treatment.

[0025] Step 3: Alkali leaching of fibers: The resulting slurry B was immersed in a 7% NaOH solution, maintaining a pH of no less than 10. The treatment temperature was maintained at 90°C for 100 minutes. Mechanical stirring (80 rpm) was maintained during the treatment to ensure uniform treatment. The fiber precipitate was separated by centrifugation, yielding a relatively high-purity wet fiber fraction C.

[0026] Step 4, alcohol washing: The wet fiber component C was mixed with 80% ethanol at a mass ratio of 1:1, and dispersed and mixed at high speed using a colloid mill to gradually flocculate and precipitate the fibers, and the upper layer of the ethanol and water mixture was discharged.

[0027] Add 0.6 times 95% ethanol to the precipitate, and use a colloid mill to disperse and mix at high speed to gradually flocculate and precipitate the fibers. Discharge the upper layer of the ethanol and water mixture to obtain precipitate D.

[0028] Step 5: Pressing and dealcoholization: The precipitated material D was placed in a belt filter press and dealcoholized at a pressure of 1 MPa for 5 min to increase the fiber solid content by more than 20%, thereby obtaining material E.

[0029] Step 6: Drying, crushing and packaging: The wet fiber material E was placed in a vacuum hot air drying device and dried at 70°C for 60 minutes at a vacuum of at least 0.08 MPa to reduce the fiber moisture content to below 10%. The fiber was then graded in an ultrafine grinder to a size of 100 mesh or larger. Finally, the fiber was sealed and packaged in a nitrogen-protected automatic packaging system to produce the finished citrus fiber.

[0030] Example 2: The process of using hydrophobic silica to reduce fiber water absorption is not using calcium carbonate dispersion process, including: Step 1: Pretreatment of citrus raw materials and auxiliary materials: Citrus peel residue was crushed into 50 mesh powder, and the mixture was allowed to stand for 24 hours at a material-liquid ratio of 1:40 to fully hydrate the fiber to obtain a mixture A. The citrus peel residue includes grapefruit peel, lemon peel, orange peel and other citrus peel residues.

[0031] Step 2: High shear treatment: The mixture A is homogenized by high shear, ball milling, colloid milling, ultra-high static pressure or high-pressure micro-jetting, and the slurry B is obtained after efficient dispersion treatment.

[0032] Step 3: Alkali leaching of fibers: The resulting slurry B was immersed in a 7% NaOH solution, maintaining a pH of no less than 10. The treatment temperature was maintained at 90°C for 100 minutes. Mechanical stirring (80 rpm) was maintained during the treatment to ensure uniform treatment. The fiber precipitate was separated by centrifugation, yielding a relatively high-purity wet fiber fraction C.

[0033] Step 4, alcohol washing: The wet fiber component C was mixed with 80% ethanol at a mass ratio of 1:1, and 1% of the wet fiber mass of hydrophobic nano-silica was added. The mixture was dispersed and mixed at high speed using a colloid mill to gradually flocculate and precipitate the fibers, and the upper layer of the ethanol and water mixture was discharged.

[0034] The precipitate was added with 0.6 times 95% ethanol and placed in an ultrasonic reactor at a frequency of 30 kHz and a power density of not less than 1 W / L for 20 min to remove nano-silica, thereby obtaining precipitate D.

[0035] Step 5: Pressing and dealcoholization: The precipitated material D was placed in a belt filter press and dealcoholized at a pressure of 1 MPa for 5 min to increase the fiber solid content by more than 20%, thereby obtaining material E.

[0036] Step 6: Drying, crushing and packaging: The wet fiber material E was placed in a vacuum hot air drying device and dried at 70°C for 60 minutes at a vacuum of at least 0.08 MPa to reduce the fiber moisture content to below 10%. The fiber was then graded in an ultrafine grinder to a size of 100 mesh or larger. Finally, the fiber was sealed and packaged in a nitrogen-protected automatic packaging system to produce the finished citrus fiber.

[0037] Example 3: The process of reducing fiber water absorption without using hydrophobic silica is a calcium carbonate dispersion process, including: Step 1: Pretreatment of citrus raw materials and auxiliary materials: Citrus peel residue was crushed into 50 mesh powder, and the mixture was allowed to stand for 24 hours at a material-liquid ratio of 1:40 to fully hydrate the fiber to obtain a mixture A. The citrus peel residue includes grapefruit peel, lemon peel, orange peel and other citrus peel residues.

[0038] Pretreatment of auxiliary material calcium carbonate: The calcium carbonate raw material is ground in a vertical mill to a particle size of d≤2 μm. The modified calcium carbonate is then surface-coated with stearic acid (1.5% to 3% by mass of the calcium carbonate) at 80-120°C and stirred at high speed for 30-60 minutes. The vertical mill further refines the particles, and stearic acid coating improves their dispersibility and compatibility.

[0039] Step 2: High shear treatment: Mixture A is homogenized by high shear, ball milling, colloid milling, ultrahigh static pressure or high-pressure microfluidization. During this process, 0.6% by weight of modified calcium carbonate of citrus peel residue is added in stages, and slurry B is obtained after efficient dispersion treatment.

[0040] Step 3: Alkali leaching of fibers: The resulting slurry B was immersed in a 7% NaOH solution with a pH of no less than 10. The treatment temperature was maintained at 90°C for 100 minutes. Mechanical stirring (80 rpm) was maintained during the treatment to ensure uniform treatment. The fiber precipitate was separated by centrifugation, and 7% citric acid was added to the precipitate to remove calcium carbonate. Finally, the fiber precipitate was washed with deionized water until neutral, thereby obtaining a high-purity wet fiber component C.

[0041] Step 4, alcohol washing: The wet fiber component C was mixed with 80% ethanol at a mass ratio of 1:1, and dispersed and mixed at high speed using a colloid mill to gradually flocculate and precipitate the fibers, and the upper layer of the ethanol and water mixture was discharged.

[0042] Add 0.6 times 95% ethanol to the precipitate, and use a colloid mill to disperse and mix at high speed to gradually flocculate and precipitate the fibers. Discharge the upper layer of the ethanol and water mixture to obtain precipitate D.

[0043] Step 5: Pressing and dealcoholization: The precipitated material D was placed in a belt filter press and dealcoholized at a pressure of 1 MPa for 5 min to increase the fiber solid content by more than 20%, thereby obtaining material E.

[0044] Step 6: Drying, crushing and packaging: The wet fiber material E was placed in a vacuum hot air drying device and dried at 70°C for 60 minutes at a vacuum of at least 0.08 MPa to reduce the fiber moisture content to below 10%. The fiber was then graded in an ultrafine grinder to a size of 100 mesh or larger. Finally, the fiber was sealed and packaged in a nitrogen-protected automatic packaging system to produce the finished citrus fiber.

[0045] Example 4: The calcium carbonate dispersion process and hydrophobic silica are used simultaneously to reduce fiber water absorption process, including: Step 1: Pretreatment of citrus raw materials and auxiliary materials: Citrus peel residue was crushed into 50 mesh powder, and the mixture was allowed to stand for 24 hours at a material-liquid ratio of 1:40 to fully hydrate the fiber to obtain a mixture A. The citrus peel residue includes grapefruit peel, lemon peel, orange peel and other citrus peel residues.

[0046] Pretreatment of auxiliary material calcium carbonate: The calcium carbonate raw material is ground in a vertical mill to a particle size of d≤2 μm. The modified calcium carbonate is then surface-coated with stearic acid (1.5% to 3% by mass of the calcium carbonate) at 80-120°C and stirred at high speed for 30-60 minutes. The vertical mill further refines the particles, and stearic acid coating improves their dispersibility and compatibility.

[0047] Step 2: High shear treatment: Mixture A is homogenized by high shear, ball milling, colloid milling, ultrahigh static pressure or high-pressure micro-jetting. During this process, modified calcium carbonate (0.6% by weight of citrus peel residue) is added in stages, and slurry B is obtained after efficient dispersion treatment.

[0048] Step 3: Alkali leaching of fibers: The resulting slurry B was immersed in a 7% NaOH solution with a pH of no less than 10. The treatment temperature was maintained at 90°C for 100 minutes. Mechanical stirring (80 rpm) was maintained during the treatment to ensure uniform treatment. The fiber precipitate was separated by centrifugation, and 7% citric acid was added to the precipitate to remove calcium carbonate. Finally, the fiber precipitate was washed with deionized water until neutral, thereby obtaining a high-purity wet fiber component C.

[0049] Step 4, alcohol washing: The wet fiber component C was mixed with 80% ethanol at a mass ratio of 1:1, and 1% of the wet fiber mass of hydrophobic nano-silica was added. The mixture was dispersed and mixed at high speed using a colloid mill to gradually flocculate and precipitate the fibers, and the upper layer of the ethanol and water mixture was discharged.

[0050] The precipitate was added with 0.6 times 95% ethanol and placed in an ultrasonic reactor at a frequency of 30 kHz and a power density of not less than 1 W / L for 20 min to remove nano-silica, thereby obtaining precipitate D.

[0051] Step 5: Pressing and dealcoholization: The precipitated material D was placed in a belt filter press and dealcoholized at a pressure of 1 MPa for 5 min to increase the fiber solid content by more than 20%, thereby obtaining material E.

[0052] Step 6: Drying, crushing and packaging: The wet fiber material E was placed in a vacuum hot air drying device and dried at 70°C for 60 minutes at a vacuum of at least 0.08 MPa to reduce the fiber moisture content to below 10%. The fiber was then graded in an ultrafine grinder to a size of 100 mesh or larger. Finally, the fiber was sealed and packaged in a nitrogen-protected automatic packaging system to produce the finished citrus fiber.

[0053] The present invention also provides a set of logically rigorous evaluation system methods for the above-mentioned embodiments 1 to 4, and records the corresponding comparison results as follows: Figure 1 Next, we will first explain the logic of the corresponding evaluation system in detail: The results of the comparative test method are explained as follows: Dehydration efficiency test method: Using the drying method, the citrus fiber before and after dehydration was dried at 105°C to constant weight, the mass change was recorded, and the moisture removal rate was calculated according to the following formula.

[0054]

[0055] Energy cost calculation method: When using this process to produce citrus fiber, the energy consumption cost calculation excludes other energy consumption such as equipment power consumption and raw material consumption, and focuses on the ethanol consumption cost, dealcoholization drying and ethanol recovery system operating costs. The total energy consumption cost is calculated according to the following formula.

[0056]

[0057] The energy consumption is calculated as follows:

[0058]

[0059]

[0060]

[0061] Calculation method for ethanol consumption: Use an alcohol meter to monitor the concentration of ethanol before and after dehydration in real time, and record the total amount of ethanol input before and after dehydration ( ) and recycling volume ( ), calculate the consumption.

[0062]

[0063] Ethanol Residue Risk Test Method: Dehydrated citrus fiber is pulverized and extracted with distilled water or an organic solvent (such as n-hexane). After centrifugation, the supernatant is collected for analysis. Ethanol content is determined using gas chromatography using a flame ionization detector (FID) and a capillary column (such as DB-WAX). Ethanol standard solutions of varying concentrations are prepared, injected, and analyzed to establish a standard curve. The treated supernatant is sampled and analyzed for qualitative determination based on retention time and quantitative determination based on peak area to calculate ethanol content. Depending on the application (such as food additives), compliance with standards such as GB 2760 and BH GSO 2538:2022 is required (typically requiring a residual level of <50 mg / kg). Alternatively, a portable alcohol tester can be used for preliminary screening of ethanol residue risk.

[0064] like Figure 1 As shown in Figure 4, the optimal solution of the present invention achieves environmental and safety benefits: reduced ethanol use, lowering safety risks. High efficiency and energy saving: calcium carbonate effectively disperses fibers, while hydrophobic silica reduces fiber water absorption, reducing ethanol usage by 30%-40%. Industrial friendliness: auxiliary materials are readily available, and calcium carbonate and hydrophobic silica are recyclable, reducing overall costs by 20%-30%.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for reducing the amount of citrus fiber used in ethanol production, comprising pre-treating the citrus raw materials and auxiliary materials, high shearing treatment, and alkali leaching of the fibers, characterized in that: After the alkali leaching treatment is completed, the wet fiber component C is obtained and then enters the alcohol washing process. The method includes: The wet fiber component C is mixed with 75%-95% ethanol at a mass ratio of 1:1, and 0.25-1.5% of the wet fiber mass of hydrophobic nano-silica is added. The mixture is dispersed and mixed at high speed using a colloid mill to gradually flocculate and precipitate the fibers, and the upper layer of the ethanol and water mixture is discharged. The precipitate is added with 0.5-0.8 times 95% ethanol, placed in an ultrasonic reactor at a frequency of 20-40 kHz and a power density of not less than 1 W / L, and treated for a preset time to remove the nano-silica, thereby obtaining precipitate D; The precipitated material D is then squeezed and dealcoholized to obtain finished citrus fiber.

2. The method for reducing the amount of ethanol produced from citrus fiber according to claim 1, characterized in that: After the citrus raw materials and auxiliary materials are pretreated, the method further comprises: The calcium carbonate raw material is placed in a vertical mill and ground to a particle size of d≤2μm to improve its dispersibility and compatibility.

3. The method for reducing the amount of ethanol produced from citrus fiber according to claim 2, characterized in that: The high shear treatment specifically includes: The mixture A is homogenized by high shear, ball milling, colloid milling, ultrahigh static pressure or high-pressure microfluidization. During this process, 0.2-1% of the weight of citrus peel residue modified calcium carbonate is added in stages, and slurry B is obtained after efficient dispersion treatment.

4. The method for reducing the amount of ethanol produced from citrus fiber according to claim 3, characterized in that: The alkali-leaching treatment of the fiber specifically comprises: The obtained slurry B is immersed in a NaOH solution with a concentration of 5%-10%, so that the pH is not lower than 10, the treatment temperature is maintained at 80℃-95℃, and the treatment time is 60-120 min; mechanical stirring is maintained during the treatment process to ensure uniform treatment; the fiber precipitate is centrifuged, 5%-10% citric acid is added to the precipitate to remove calcium carbonate, and the fiber precipitate is washed with deionized water until neutral, thereby obtaining a wet fiber component C with higher purity.

5. The method for reducing the amount of ethanol produced from citrus fiber according to any one of claims 1 to 4, characterized in that: The pre-processing of the orange raw materials and auxiliary materials specifically includes: Citrus peel residue is crushed into 40-60 mesh powder, and the mixture is allowed to stand for 12-24 hours at a material-liquid ratio of 1:40 to 1:50 to fully hydrate the fiber to obtain a mixture A; wherein the citrus peel residue includes grapefruit peel, lemon peel and orange peel residue.

6. The method for reducing the amount of ethanol produced from citrus fiber according to any one of claims 1 to 4, characterized in that: The method of obtaining the finished citrus fiber further includes a pressing and dealcoholization process, specifically: The precipitated material D was placed on a belt filter press and dealcoholized at a pressure of 0.5-2 MPa for 2-10 min to obtain material E.

7. The method of reducing the amount of ethanol produced from citrus fiber according to claim 6, characterized in that: It also includes drying, crushing and packaging processes, specifically: The water-containing fiber material E is placed in a vacuum hot air drying device and dried at 50-80°C for 30-120 min under a vacuum degree of more than 0.08 MPa to reduce the fiber moisture content to below 10%; then the fiber is put into an ultrafine grinder for classification to above 100 mesh, and finally sealed and packaged by a nitrogen-protected automatic packaging system to obtain the finished citrus fiber.

8. The method of reducing the amount of ethanol produced from citrus fiber according to claim 1, characterized in that: The high shear treatment specifically includes: The mixture A is homogenized by high shear, ball milling, colloid milling, ultrahigh static pressure or high-pressure microfluidization, and the slurry B is obtained after efficient dispersion treatment.

9. The method of claim 1, wherein: The alkali leaching fiber treatment specifically includes: The resulting slurry B was immersed in a 7% NaOH solution, maintaining a pH of no less than 10. The treatment temperature was maintained at 90°C for 100 minutes. Mechanical stirring was maintained at 80 rpm to ensure uniform treatment. The fiber precipitate was then centrifuged to obtain a relatively high-purity wet fiber component C.

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