Anhydrous refining process and equipment for tea-seed oil

Abstract

The invention discloses a tea-seed oil anhydrous refining process and equipment, and relates to the technical field of tea-seed oil anhydrous refining. First raw tea-seed oil is extracted by using a physical squeezing method; solid cake scrap impurities in the first raw tea seed oil are removed, and second raw tea seed oil is obtained; combining and mixing the raw tea seed oil and activated carbon to obtain a first mixture, and stirring the first mixture; absolute ethyl alcohol is added into the semi-finished tea seed oil; according to the invention, the combination of activated carbon is selected to optimize the degumming process of the raw tea seed oil, meanwhile, physicochemical indexes are ensured to be qualified, the loss of beneficial nutrients is reduced, and the content of heavy metal lead ions and the color reversion phenomenon are controlled; adding a certain proportion of absolute ethyl alcohol into the filtered tea seed oil, and stirring to remove residual phospholipid and other fat-soluble impurities; the absolute ethyl alcohol can remove pigments in the tea-seed oil, so that the tea-seed oil becomes clearer and more transparent. The anhydrous refining route of the tea-seed oil can effectively remove impurities in the tea-seed oil and improve the quality and stability of the oil product.

Description

Technical Field

[0001] The invention relates to the technical field of anhydrous tea seed oil refining, in particular to an anhydrous tea seed oil refining process and equipment. Background Art

[0002] The refining process of seed oil includes alkali refining, water washing, dehydration, bleaching and dewaxing. While these steps improve the purity and sensory quality of the oil, they also bring about environmental pollution and complex processes. A large amount of water is required during the water washing process, which not only increases costs but may also burden the environment.

[0003] Studies have shown that the physical and chemical properties and nutritional quality of camellia oil change during the refining process. For example, the acid value and peroxide value of raw camellia oil will be significantly reduced during the refining process, but at the same time, the content of active ingredients such as tea polyphenols, α-tocopherol and squalene will also decrease. This means that although refining can improve the quality and shelf life of the oil, it will also lead to the loss of some beneficial nutrients.

[0004] Changes in fatty acid composition: During the refining process, the fatty acid composition of camellia oil will also change to a certain extent. For example, the proportion of monounsaturated fatty acids will decrease, while the proportion of saturated fatty acids and trans fatty acids will increase.

[0005] Therefore, although the current tea seed oil refining process can improve the quality and stability of the product, there are also problems such as environmental pollution, complicated process and large loss of nutrients in the oil body. This is based on the common problems of incomplete hydration, large water consumption for hydration degumming, high cost, poor environment and difficult oil foot treatment in my country's current oil refining process. Summary of the invention

[0006] In order to solve the existing technical problems, the present invention provides a tea seed oil anhydrous refining process and equipment. The following technical solutions are adopted:

[0007] A tea seed oil anhydrous refining process comprises the following steps:

[0008] Step 1, washing and drying the tea seeds, and extracting the first raw tea seed oil by a physical pressing method;

[0009] Step 2, removing solid cake impurities in the first raw tea seed oil to obtain a second raw tea seed oil;

[0010] Step 3, selecting an activated carbon combination of corresponding weight parts according to the ratio of saturated fatty acids to unsaturated fatty acids in the second raw tea seed oil component, mixing the raw tea seed oil and the activated carbon combination to obtain a first mixture, and stirring the first mixture;

[0011] Step 4, separating and stirring the first mixture to obtain a first semi-finished tea seed oil;

[0012] Step 5, adding anhydrous ethanol to the semi-finished tea seed oil and stirring to obtain a second mixture;

[0013] Step 6, separating the second mixture to obtain a second semi-finished tea seed oil;

[0014] Step 7, heating and dehydrating the second semi-finished tea seed oil under vacuum conditions;

[0015] Step 8, removing the peculiar smell in the second semi-finished tea seed oil by steam distillation under vacuum and high temperature conditions;

[0016] Step 9, cooling the second semi-finished tea seed oil, and then performing final filtration through a fine filter to obtain finished tea seed oil.

[0017] By adopting the above technical solution, high-quality tea seeds are selected, cleaned and dried. Tea seed oil is extracted by physical pressing. This step produces raw tea seed oil and cake crumbs. The pressed raw tea seed oil is passed through a filter to remove solid impurities such as cake crumbs.

[0018] The selection of activated carbon combination to optimize the degumming process of raw tea seed oil, while ensuring that the physical and chemical indicators are qualified, reducing the loss of beneficial nutrients, and controlling the content of heavy metal lead ions and color reversion phenomenon requires comprehensive consideration of the following aspects:

[0019] Understand the ratio of saturated and unsaturated fatty acids in the oil, because activated carbon may absorb some unsaturated fatty acids. Impurity content: including colloids, free fatty acids, pigments, heavy metals, etc. Chroma: The color depth of the oil. The darker the color, the more activated carbon may be needed.

[0020] Choose the appropriate type of activated carbon according to the characteristics of the oil, such as wood activated carbon, coconut shell activated carbon, etc.

[0021] Fine-grained activated carbon has a larger specific surface area than coarse-grained activated carbon and has a better adsorption effect.

[0022] Adsorption capacity: Choose activated carbon with high adsorption capacity for pigments and heavy metals.

[0023] Mix the raw tea seed oil with activated carbon in a certain proportion, usually 1-2%. Stir the mixture so that the activated carbon can fully absorb the colloid and pigment in the oil. Filter the activated carbon and oil mixture to remove the activated carbon and the adsorbed impurities.

[0024] Add a certain proportion of anhydrous ethanol to the filtered tea seed oil and stir to remove the remaining phospholipids and other fat-soluble impurities. Use a separatory funnel to separate the oil and ethanol mixture.

[0025] Dehydration is performed under vacuum to remove ethanol and water. Steam distillation is performed under vacuum and heating to remove odors from the oil.

[0026] The deodorized tea seed oil is cooled to room temperature and then passed through a fine filter for final filtration.

[0027] Specifically, after deodorization, dewaxing treatment needs to be carried out under low temperature control. Dewaxing and deodorization can be integrated, and the dewaxing device can be installed around the refrigeration pipe of the deodorization tower. The refrigeration effect of the refrigeration pipe of the deodorization tower is used to carry out dewaxing treatment. The temperature can be controlled at 1-2°C above the solidification point of tea seed oil. The free wax in the tea seed oil can be removed, and the quality of the finished tea seed oil can be further increased.

[0028] During the entire refining process, temperature and time must be strictly controlled to avoid excessive loss of nutrients.

[0029] Wastewater from the refining process must be treated before it can be discharged to reduce environmental pollution. This refining route can effectively remove impurities in tea seed oil and improve the quality and stability of the oil.

[0030] Optionally, in step 2, the adsorbent is added to the raw tea seed oil, mixed evenly, left to stand for 15 to 30 minutes, and filtered under vacuum conditions to remove solid impurities.

[0031] Optionally, the amount of adsorbent added is 0.5%-2% of the weight of the raw tea seed oil, the adsorbent includes diatomaceous earth and perlite, the weight ratio of diatomaceous earth and perlite is 6:4, the particle size range of diatomaceous earth is between 0.5 and 2 microns, and the particle size range of perlite is between 0.5-2 mm.

[0032] By adopting the above technical solution, using a mixture of diatomaceous earth and perlite as adsorbents, the advantages of the two adsorbents can be combined to improve the filtration effect. Diatomaceous earth can more effectively adsorb fine impurities, while perlite helps to remove larger solid particles.

[0033] First determine the total amount of raw tea seed oil, and then calculate the total adsorbent dosage based on the range of 0.5% to 2%. For example, if the total amount of raw tea seed oil is 1000 kg and a 1% addition ratio is selected, the total adsorbent dosage is 10 kg.

[0034] Distribute the weight of diatomaceous earth and perlite in the above recommended proportions. The amount of diatomaceous earth can be 6-7 kg, and the amount of perlite can be 3-4 kg.

[0035] Mix the calculated diatomaceous earth and perlite evenly according to the proportion.

[0036] Slowly add the mixed adsorbent to the raw tea seed oil and stir gently to ensure even distribution.

[0037] Follow the steps mentioned above for settling and filtering.

[0038] Optionally, in step 3, a raw tea seed oil component analysis device is used to analyze the ratio of saturated fatty acids and unsaturated fatty acids in the second raw tea seed oil, and to analyze the impurity content, wherein the impurities include colloids, free fatty acids, pigments and heavy metals. The data on the ratio of saturated fatty acids and unsaturated fatty acids and the impurity content are input into a trained machine learning model, and the machine learning model outputs the components of the activated carbon combination. The activated carbon combination is configured according to the components, the activated carbon combination is mixed with the raw tea seed oil, heated to 50-60°C, and the first mixture is stirred for 30 to 40 minutes.

[0039] By adopting the above technical scheme, a combination of activated carbon is selected to optimize the degumming process of raw tea seed oil, while ensuring that the physical and chemical indicators are qualified, reducing the loss of beneficial nutrients, and controlling the heavy metal lead ion content and color reversion phenomenon. Here, a trained machine learning model is used to perform intelligent component prediction of the activated carbon combination to avoid the oil quality risk caused by poor ratio of activated carbon components due to subjective judgment of technicians. The activated carbon combination is mixed with raw tea seed oil at 50-60℃ and stirred for 30 to 40 minutes to allow the activated carbon to fully absorb impurities such as colloid and pigment in the oil.

[0040] Optionally, in step 3, historical experimental data are collected, the historical experimental data including fatty acid ratio, impurity content, components of activated carbon combination, and effect evaluation scores after treatment;

[0041] Construct a linear regression model and divide the historical experimental data into a training set and a validation set; use the training set data to train the model and use the validation set to evaluate the model performance;

[0042] The basic formula for a linear regression model is:

[0043] y=β0+β1x1+β2x2+β3x3+∈;

[0044] Where y is the target variable for prediction, specifically the components of the activated carbon combination, β0 is the intercept term, x1 is the characteristic term for the proportion of saturated fatty acids, x2 is the characteristic term for the proportion of unsaturated fatty acids, x3 is the characteristic term for the impurity content, β1, β2 and β3 are the coefficients of their respective characteristic terms, and ∈ is the error term.

[0045] By adopting the above technical solution, determining the optimal ratio of activated carbon is an experimental and optimization process involving multiple steps and considerations. By collecting historical experimental data on fatty acid ratio, impurity content, components of activated carbon combination, and post-treatment effect evaluation scores, where the post-treatment effect evaluation score is mainly based on the test of oil quality after the experiment, a machine learning model is constructed to output the components of the activated carbon combination based on data such as the ratio of saturated fatty acids and unsaturated fatty acids and impurity content, with higher accuracy.

[0046] Optionally, in step 5, 5%-8% by weight of anhydrous ethanol is added to the first semi-finished tea seed oil, stirred at room temperature for 10-12 minutes to obtain a second mixture, and a separatory funnel is used to separate the oil and ethanol mixture to obtain the second semi-finished tea seed oil.

[0047] By adopting the above technical scheme, a certain proportion of anhydrous ethanol, usually 5-8%, is added to the filtered tea seed oil, and stirred at room temperature for 10-12 minutes to remove the remaining phospholipids and other fat-soluble impurities, and a separatory funnel is used to separate the oil and ethanol mixture.

[0048] Anhydrous ethanol can remove the pigments in tea seed oil, making it clearer and more transparent. This is critical to improving the sensory quality of the oil. Anhydrous ethanol treatment helps remove the bad smell in tea seed oil, improve the aroma of the oil, and make it more suitable for consumers. Anhydrous ethanol treatment can effectively remove these waxes, thereby improving the fluidity and appearance of the oil. Anhydrous ethanol can dissolve and remove some impurities such as free fatty acids, phospholipids, proteins, etc. in the oil, and improve the purity of the oil. By removing components that are prone to oxidation, anhydrous ethanol treatment can increase the oxidative stability of tea seed oil and extend its shelf life. Anhydrous ethanol treatment can help remove some pesticide residues and improve the safety of the product. After removing impurities, the nutrients in tea seed oil are purer and easier for human absorption.

[0049] Anhydrous ethanol is a renewable solvent that has less environmental impact than other organic solvents and is easy to recycle and reuse.

[0050] Optionally, in step 7, in a vacuum system, the second semi-finished tea seed oil is linearly heated from room temperature to 50-60°C within 3 minutes for a first dehydration treatment, and after cooling to room temperature, it is linearly heated from room temperature to 70-80°C within 3 minutes for a second dehydration treatment.

[0051] By adopting the above technical solution, heating and dehydrating tea seed oil under vacuum conditions is an effective method to remove ethanol and water. Gradually increasing the temperature linearly instead of rapidly heating can help better control the dehydration process and prevent local overheating. Performing two vacuum dehydration treatments, with the target temperature gradually increasing each time, can more efficiently and evenly remove ethanol and water and avoid affecting the oil.

[0052] Optionally, in step 8, the second semi-finished tea seed oil after the second dehydration treatment is introduced into a deodorization tower with a vacuum degree of 0.1-0.5 MPa and a steam temperature of 150-180° C. to distill and remove odor from the second semi-finished tea seeds.

[0053] By adopting the above technical solution, the peculiar smell in the second semi-finished tea seeds can be further removed.

[0054] A tea seed oil anhydrous refining equipment comprises a press, a pressure filter, a raw tea seed oil component analysis device, an activated carbon filter, a first stirred reactor, a first centrifugal separator, a second stirred reactor, a second centrifugal separator, a vacuum dehydrator, a deodorizing tower and a fine filter, wherein the press physically presses tea seeds to obtain first raw tea seed oil, solid cake impurities in the first raw tea seed oil are removed by the pressure filter to obtain second raw tea seed oil, the raw tea seed oil component analysis device analyzes the second raw tea seed oil to obtain components of an activated carbon combination, and the activated carbon is configured The combination is mixed with raw tea seed oil in a first stirred reactor to obtain a first mixture and stirred, the first mixture is separated by a first centrifugal separator to obtain a first semi-finished tea seed oil, the first semi-finished tea seed oil is added to a second stirred reactor, anhydrous ethanol is added and stirred to obtain a second mixture, the second mixture is separated by a second centrifugal separator to obtain a second semi-finished tea seed oil, the second semi-finished tea seed oil is added to a vacuum dehydrator to remove ethanol and water, then added to a deodorizing tower to remove odor in the second semi-finished tea seed oil through steam distillation, and finally filtered through a fine filter to obtain a finished tea seed oil.

[0055] Optionally, the raw tea seed oil component analysis device includes an oil component analyzer, a memory and an industrial computer, wherein the oil component analyzer is used to analyze the saturated fatty acid content, unsaturated fatty acid content and impurity content of the second raw tea seed oil, the memory is communicatively connected to the oil component analyzer to store the analysis result data, the industrial computer is communicatively connected to the memory, the industrial computer deploys a machine learning model, enters the analysis result data into the machine learning model, and the machine learning model outputs the component prediction results of the activated carbon combination.

[0056] Through the above technical scheme, a production line for anhydrous refining of tea seed oil is formed by using a press, a pressure filter, a raw tea seed oil component analysis device, an activated carbon filter, a first stirred reactor, a first centrifuge, a second stirred reactor, a second centrifuge, a vacuum dehydrator, a deodorization tower and a fine filter, which can efficiently complete the industrialized anhydrous refining of tea seed oil.

[0057] In summary, the present invention includes at least the following beneficial technical effects:

[0058] The present invention can provide a tea seed oil anhydrous refining process and equipment, select a combination of activated carbon to optimize the degumming process of raw tea seed oil, ensure that the physical and chemical indicators are qualified, reduce the loss of beneficial nutrients, and control the heavy metal lead ion content and the color reversion phenomenon; add a certain proportion of anhydrous ethanol to the filtered tea seed oil, and stir to remove the remaining phospholipids and other fat-soluble impurities. Anhydrous ethanol can remove the pigment in the tea seed oil, making it clearer and more transparent. This is very critical to improving the sensory quality of the oil. Anhydrous ethanol treatment helps to remove the bad smell in the tea seed oil, improve the fragrance of the oil, and make it more suitable for consumers. Anhydrous ethanol treatment can effectively remove these waxes, thereby improving the fluidity and appearance of the oil. Anhydrous ethanol can dissolve and remove some impurities such as free fatty acids, phospholipids, proteins, etc. in the oil, and improve the purity of the oil. By removing components that are easy to cause oxidation, anhydrous ethanol treatment can increase the oxidation stability of the tea seed oil and extend its shelf life. Anhydrous ethanol treatment can help remove some pesticide residues and improve the safety of the product. After removing impurities, the nutrients in tea seed oil are purer and easier for human body to absorb. The waterless refining route of tea seed oil can effectively remove impurities in tea seed oil and improve the quality and stability of the oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 The present invention is a schematic diagram of the process of anhydrous tea seed oil refining. DETAILED DESCRIPTION

[0060] The present invention is further described in detail below in conjunction with the accompanying drawings. The embodiment of the present invention discloses a tea seed oil anhydrous refining process and equipment.

[0061] Reference Figure 1 , a tea seed oil anhydrous refining process, comprising the following steps:

[0062] Step 1, washing and drying the tea seeds, and extracting the first raw tea seed oil by a physical pressing method;

[0063] Step 2, removing solid cake impurities in the first raw tea seed oil to obtain a second raw tea seed oil;

[0064] Step 3, selecting an activated carbon combination of corresponding weight parts according to the ratio of saturated fatty acids to unsaturated fatty acids in the second raw tea seed oil component, mixing the raw tea seed oil and the activated carbon combination to obtain a first mixture, and stirring the first mixture;

[0065] Step 4, separating and stirring the first mixture to obtain a first semi-finished tea seed oil;

[0066] Step 5, adding anhydrous ethanol to the semi-finished tea seed oil and stirring to obtain a second mixture;

[0067] Step 6, separating the second mixture to obtain a second semi-finished tea seed oil;

[0068] Step 7, heating and dehydrating the second semi-finished tea seed oil under vacuum conditions;

[0069] Step 8, removing the peculiar smell in the second semi-finished tea seed oil by steam distillation under vacuum and high temperature conditions;

[0070] Step 9, cooling the second semi-finished tea seed oil, and then performing final filtration through a fine filter to obtain finished tea seed oil.

[0071] Select high-quality tea seeds, wash and dry them. Use physical pressing to extract tea seed oil. This step will produce raw tea seed oil and cake crumbs. The pressed raw tea seed oil is passed through a filter to remove solid impurities such as cake crumbs.

[0072] The selection of activated carbon combination to optimize the degumming process of raw tea seed oil, while ensuring that the physical and chemical indicators are qualified, reducing the loss of beneficial nutrients, and controlling the content of heavy metal lead ions and color reversion phenomenon requires comprehensive consideration of the following aspects:

[0073] Understand the ratio of saturated and unsaturated fatty acids in the oil, because activated carbon may absorb some unsaturated fatty acids. Impurity content: including colloids, free fatty acids, pigments, heavy metals, etc. Chroma: The color depth of the oil. The darker the color, the more activated carbon may be needed.

[0074] Choose the appropriate type of activated carbon according to the characteristics of the oil, such as wood activated carbon, coconut shell activated carbon, etc.

[0075] Fine-grained activated carbon has a larger specific surface area than coarse-grained activated carbon and has a better adsorption effect.

[0076] Adsorption capacity: Choose activated carbon with high adsorption capacity for pigments and heavy metals.

[0077] Mix the raw tea seed oil with activated carbon in a certain proportion, usually 1-2%. Stir the mixture so that the activated carbon can fully absorb the colloid and pigment in the oil. Filter the activated carbon and oil mixture to remove the activated carbon and the adsorbed impurities.

[0078] Add a certain proportion of anhydrous ethanol to the filtered tea seed oil and stir to remove the remaining phospholipids and other fat-soluble impurities. Use a separatory funnel to separate the oil and ethanol mixture.

[0079] Dehydration is performed under vacuum to remove ethanol and water. Steam distillation is performed under vacuum and heating to remove odors from the oil.

[0080] The deodorized tea seed oil is cooled to room temperature and then passed through a fine filter for final filtration.

[0081] Specifically, after deodorization, dewaxing treatment needs to be carried out under low temperature control. Dewaxing and deodorization can be integrated, and the dewaxing device can be installed around the refrigeration pipe of the deodorization tower. The refrigeration effect of the refrigeration pipe of the deodorization tower is used to carry out dewaxing treatment. The temperature can be controlled at 1-2°C above the solidification point of tea seed oil. The free wax in the tea seed oil can be removed, and the quality of the finished tea seed oil can be further increased.

[0082] During the entire refining process, temperature and time must be strictly controlled to avoid excessive loss of nutrients.

[0083] Wastewater from the refining process must be treated before it can be discharged to reduce environmental pollution. This refining route can effectively remove impurities in tea seed oil and improve the quality and stability of the oil.

[0084] In step 2, the adsorbent is added to the raw tea seed oil, mixed evenly, left to stand for 15 to 30 minutes, and filtered under vacuum conditions to remove solid impurities.

[0085] The added amount of the adsorbent is 0.5%-2% of the weight of the raw tea seed oil. The adsorbent includes diatomaceous earth and perlite. The weight ratio of diatomaceous earth and perlite is 6:4. The particle size range of diatomaceous earth is between 0.5 and 2 microns, and the particle size range of perlite is between 0.5-2 mm.

[0086] Using a mixture of diatomaceous earth and perlite as an adsorbent can combine the advantages of both adsorbents to improve the filtration effect. Diatomaceous earth can more effectively adsorb fine impurities, while perlite helps remove larger solid particles.

[0087] First determine the total amount of raw tea seed oil, and then calculate the total adsorbent dosage based on the range of 0.5% to 2%. For example, if the total amount of raw tea seed oil is 1000 kg and a 1% addition ratio is selected, the total adsorbent dosage is 10 kg.

[0088] Distribute the weight of diatomaceous earth and perlite in the above recommended proportions. The amount of diatomaceous earth can be 6-7 kg, and the amount of perlite can be 3-4 kg.

[0089] Mix the calculated diatomaceous earth and perlite evenly according to the proportion.

[0090] Slowly add the mixed adsorbent to the raw tea seed oil and stir gently to ensure even distribution.

[0091] Follow the steps mentioned above for settling and filtering.

[0092] In step 3, a raw tea seed oil component analysis device is used to analyze the ratio of saturated fatty acids and unsaturated fatty acids in the second raw tea seed oil, and to analyze the impurity content, wherein the impurities include colloids, free fatty acids, pigments and heavy metals. The data of the ratio of saturated fatty acids and unsaturated fatty acids and the impurity content are input into a trained machine learning model. The machine learning model outputs the components of the activated carbon combination, and the activated carbon combination is configured according to the components. The activated carbon combination is mixed with the raw tea seed oil, heated to 50-60° C., and the first mixture is stirred for 30 to 40 minutes.

[0093] A combination of activated carbons is selected to optimize the degumming process of raw tea seed oil, while ensuring that the physical and chemical indicators are qualified, reducing the loss of beneficial nutrients, and controlling the heavy metal lead ion content and color reversion phenomenon. A trained machine learning model is used here to perform intelligent component prediction of the activated carbon combination to avoid the oil quality risk caused by poor ratio of activated carbon components due to subjective judgment of technicians. The activated carbon combination is mixed with raw tea seed oil at 50-60℃ and stirred for 30 to 40 minutes to allow the activated carbon to fully absorb impurities such as colloid and pigment in the oil.

[0094] In step 3, historical experimental data are collected, including fatty acid ratio, impurity content, components of activated carbon combination, and effect evaluation scores after treatment;

[0095] Construct a linear regression model and divide the historical experimental data into a training set and a validation set; use the training set data to train the model and use the validation set to evaluate the model performance;

[0096] The basic formula for a linear regression model is:

[0097] y=β0+β1x1+β2x2+β3x3+∈;

[0098] Where y is the target variable for prediction, specifically the components of the activated carbon combination, β0 is the intercept term, x1 is the characteristic term for the proportion of saturated fatty acids, x2 is the characteristic term for the proportion of unsaturated fatty acids, x3 is the characteristic term for the impurity content, β1, β2 and β3 are the coefficients of their respective characteristic terms, and ∈ is the error term.

[0099] Determining the optimal ratio of activated carbon is an experimental and optimization process involving multiple steps and considerations. By collecting historical experimental data on fatty acid ratio, impurity content, components of activated carbon combination, and post-treatment effect evaluation scores, where the post-treatment effect evaluation scores are mainly based on the test of oil quality after the experiment, a machine learning model is constructed to output the components of the activated carbon combination based on data such as the ratio of saturated fatty acids and unsaturated fatty acids and impurity content, with higher accuracy.

[0100] In step 5, 5%-8% by weight of anhydrous ethanol is added to the first semi-finished tea seed oil, and the mixture is stirred at room temperature for 10-12 minutes to obtain a second mixture, and a separatory funnel is used to separate the oil and ethanol mixture to obtain the second semi-finished tea seed oil.

[0101] Add a certain proportion of anhydrous ethanol, usually 5-8%, to the filtered tea seed oil and stir at room temperature for 10-12 minutes to remove the remaining phospholipids and other fat-soluble impurities. Use a separatory funnel to separate the oil and ethanol mixture.

[0102] Anhydrous ethanol can remove the pigments in tea seed oil, making it clearer and more transparent. This is critical to improving the sensory quality of the oil. Anhydrous ethanol treatment helps remove the bad smell in tea seed oil, improve the aroma of the oil, and make it more suitable for consumers. Anhydrous ethanol treatment can effectively remove these waxes, thereby improving the fluidity and appearance of the oil. Anhydrous ethanol can dissolve and remove some impurities such as free fatty acids, phospholipids, proteins, etc. in the oil, and improve the purity of the oil. By removing components that are prone to oxidation, anhydrous ethanol treatment can increase the oxidative stability of tea seed oil and extend its shelf life. Anhydrous ethanol treatment can help remove some pesticide residues and improve the safety of the product. After removing impurities, the nutrients in tea seed oil are purer and easier for human absorption.

[0103] Anhydrous ethanol is a renewable solvent that has less environmental impact than other organic solvents and is easy to recycle and reuse.

[0104] In step 7, in a vacuum system, the second semi-finished tea seed oil is linearly heated from room temperature to 50-60°C within 3 minutes for the first dehydration treatment, and after cooling to room temperature, it is linearly heated from room temperature to 70-80°C within 3 minutes for the second dehydration treatment.

[0105] Heating and dehydrating tea seed oil under vacuum conditions is an effective method to remove ethanol and water. Gradually increasing the temperature linearly instead of rapidly heating can help better control the dehydration process and prevent local overheating. Performing two vacuum dehydration treatments, with the target temperature gradually increasing each time, can more efficiently and evenly remove ethanol and water, avoiding affecting the oil quality.

[0106] In step 8, the second semi-finished tea seed oil after the second dehydration treatment is introduced into a deodorization tower with a vacuum degree of 0.1-0.5 MPa and a steam temperature of 150-180° C. to distill and remove the odor in the second semi-finished tea seeds.

[0107] The peculiar smell in the second semi-finished tea seeds can be further removed.

[0108] A tea seed oil anhydrous refining equipment comprises a press, a pressure filter, a raw tea seed oil component analysis device, an activated carbon filter, a first stirred reactor, a first centrifugal separator, a second stirred reactor, a second centrifugal separator, a vacuum dehydrator, a deodorizing tower and a fine filter, wherein the press physically presses tea seeds to obtain first raw tea seed oil, solid cake impurities in the first raw tea seed oil are removed by the pressure filter to obtain second raw tea seed oil, the raw tea seed oil component analysis device analyzes the second raw tea seed oil to obtain components of an activated carbon combination, and the activated carbon combination is configured. The first mixture is separated by a first centrifugal separator to obtain a first semi-finished tea seed oil; the first semi-finished tea seed oil is added to a second stirred reactor, and anhydrous ethanol is added and stirred to obtain a second mixture; the second mixture is separated by a second centrifugal separator to obtain a second semi-finished tea seed oil; the second semi-finished tea seed oil is added to a vacuum dehydrator to remove ethanol and water, and then added to a deodorizing tower to remove odor in the second semi-finished tea seed oil through steam distillation, and finally filtered through a fine filter to obtain a finished tea seed oil.

[0109] The raw tea seed oil component analysis device includes an oil component analyzer, a memory and an industrial computer. The oil component analyzer is used to analyze the saturated fatty acid content, unsaturated fatty acid content and impurity content of the second raw tea seed oil. The memory is communicated with the oil component analyzer to store the analysis result data. The industrial computer is communicated with the memory. The industrial computer deploys a machine learning model, enters the analysis result data into the machine learning model, and the machine learning model outputs the component prediction result of the activated carbon combination.

[0110] The production line for anhydrous refining of tea seed oil comprises a press, a pressure filter, a raw tea seed oil component analysis device, an activated carbon filter, a first stirred reactor, a first centrifuge, a second stirred reactor, a second centrifuge, a vacuum dehydrator, a deodorizing tower and a fine filter, and can efficiently complete the industrialized anhydrous refining of tea seed oil.

[0111] The following specific implementation case is used to illustrate the implementation principle of a tea seed oil anhydrous refining process and equipment:

[0112] Pressed tea seed oil:

[0113] Raw material preparation: Select high-quality tea seeds, wash and dry them.

[0114] Pressing: Tea seed oil is extracted using a physical pressing method. This step produces raw tea seed oil and cake crumbs.

[0115] Filter (to remove crumbs):

[0116] Equipment: Use a vibrating screen or pressure filter.

[0117] Operation: Pass the squeezed tea seed oil through a filter to remove solid impurities such as cake crumbs.

[0118] Activated carbon adsorption (degumming, decolorization):

[0119] Preparation of activated carbon: The oil component analyzer analyzes the saturated fatty acid content, unsaturated fatty acid content and impurity content of the second raw tea seed oil. The machine learning model outputs the component prediction results of the activated carbon combination. The activated carbon combination accounts for 1.5% by weight of the raw tea seed oil. The activated carbon combination uses activated carbon and modified rice husk ash in a weight ratio of 2:1. The raw tea seed oil and the activated carbon combination are mixed, and the mixture is stirred at a temperature of 50-60°C to allow the activated carbon to fully absorb the colloid, pigment and impurities in the oil.

[0120] The activated carbon and oil mixture is filtered to remove the activated carbon and adsorbed impurities.

[0121] Add 6% anhydrous ethanol to the filtered tea seed oil.

[0122] Stir at room temperature for 10 min to remove remaining phospholipids and other fat-soluble impurities.

[0123] Separation of the oil and ethanol mixture was performed using a separatory funnel.

[0124] Under vacuum conditions, the tea seed oil was linearly heated to 55°C for 3 minutes for the first dehydration treatment, cooled to room temperature within 5 minutes through a cooling device, and then linearly heated to 75°C for 3 minutes for the second dehydration treatment to remove ethanol and water.

[0125] The odor in the oil is removed by steam distillation under vacuum and heating conditions at 170℃ and vacuum degree 0.4MPa.

[0126] The deodorized tea seed oil is cooled to room temperature and then passed through a fine filter for final filtration.

[0127] The refined tea seed oil is filled under sterile conditions and sealed for storage.

[0128] After the above process, the tea seed oil is clearer and more transparent, without suspended matter and sediment, which improves the appearance quality of the product, reduces the impurity content, and improves the purity of the oil. The activated carbon adsorption process effectively decolorizes the tea seed oil, making the color more stable and beautiful, which meets consumers' expectations for the color of high-quality edible oil. Activated carbon adsorption can remove substances that promote oxidation in the oil, and anhydrous ethanol treatment further removes phospholipids and other easily oxidized components, thereby improving the oxidation stability of the oil and extending its shelf life.

[0129] The deodorization process removes odors from the oil, making the taste and smell of tea seed oil purer and more suitable for consumers' tastes.

[0130] Anhydrous ethanol treatment effectively removes phospholipids from the oil, lowers the acid value, and reduces the possibility of oxidative rancidity.

[0131] The dehydration process reduces the water content in the oil, reduces hydrolysis, thereby reducing the acid value and improving the quality of the oil.

[0132] After being processed through the above process, the storage performance of tea seed oil is improved, it is less likely to deteriorate, and is more suitable for long-term storage.

[0133] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tea seed oil anhydrous refining process, characterized in that: The following steps are involved: Step 1, washing and drying tea seeds, and extracting the first raw tea seed oil by physical pressing method; Step 2, removing solid cake impurities in the first raw tea seed oil to obtain a second raw tea seed oil; Step 3, selecting an activated carbon combination of corresponding weight parts according to the ratio of saturated fatty acids to unsaturated fatty acids in the second raw tea seed oil component, mixing the raw tea seed oil and the activated carbon combination to obtain a first mixture, and stirring the first mixture; Step 4, separating and stirring the first mixture to obtain a first semi-finished tea seed oil; Step 5, adding anhydrous ethanol to the semi-finished tea seed oil and stirring to obtain a second mixture; Step 6, separating the second mixture to obtain a second semi-finished tea seed oil; Step 7, heating and dehydrating the second semi-finished tea seed oil under vacuum conditions; Step 8, removing the peculiar smell in the second semi-finished tea seed oil by steam distillation under vacuum and high temperature conditions; Step 9, cooling the second semi-finished tea seed oil, and then performing final filtration through a fine filter to obtain finished tea seed oil.

2. A tea seed oil anhydrous refining process according to claim 1, characterized in that: In step 2, the adsorbent is added to the raw tea seed oil, mixed evenly, left to stand for 15 to 30 minutes, and filtered under vacuum conditions to remove solid impurities.

3. A tea seed oil anhydrous refining process according to claim 2, characterized in that: The added amount of the adsorbent is 0.5%-2% of the weight of the raw tea seed oil. The adsorbent includes diatomaceous earth and perlite. The weight ratio of diatomaceous earth and perlite is 6:

4. The particle size range of diatomaceous earth is between 0.5 and 2 microns, and the particle size range of perlite is between 0.5-2 mm.

4. A tea seed oil anhydrous refining process according to claim 3, characterized in that: In step 3, a raw tea seed oil component analysis device is used to analyze the ratio of saturated fatty acids and unsaturated fatty acids in the second raw tea seed oil, and to analyze the impurity content, wherein the impurities include colloids, free fatty acids, pigments and heavy metals. The data of the ratio of saturated fatty acids and unsaturated fatty acids and the impurity content are input into a trained machine learning model. The machine learning model outputs the components of the activated carbon combination, and the activated carbon combination is configured according to the components. The activated carbon combination is mixed with the raw tea seed oil, heated to 50-60° C., and the first mixture is stirred for 30 to 40 minutes.

5. A tea seed oil anhydrous refining process according to claim 4, characterized in that: In step 3, historical experimental data are collected, including fatty acid ratio, impurity content, components of activated carbon combination, and effect evaluation scores after treatment; Construct a linear regression model and divide the historical experimental data into a training set and a validation set; use the training set data to train the model and use the validation set to evaluate the model performance; The basic formula for a linear regression model is: y=β0+β1x1+β2x2+β3x3+∈; Where y is the target variable for prediction, specifically the components of the activated carbon combination, β0 is the intercept term, x1 is the characteristic term for the proportion of saturated fatty acids, x2 is the characteristic term for the proportion of unsaturated fatty acids, x3 is the characteristic term for the impurity content, β1, β2 and β3 are the coefficients of their respective characteristic terms, and ∈ is the error term.

6. The anhydrous refining process of tea seed oil according to claim 5, characterized in that: In step 5, 5%-8% by weight of anhydrous ethanol is added to the first semi-finished tea seed oil, and the mixture is stirred at room temperature for 10-12 minutes to obtain a second mixture, and a separatory funnel is used to separate the oil and ethanol mixture to obtain the second semi-finished tea seed oil.

7. A tea seed oil anhydrous refining process according to claim 6, characterized in that: In step 7, in a vacuum system, the second semi-finished tea seed oil is linearly heated from room temperature to 50-60°C within 3 minutes for the first dehydration treatment, and after cooling to room temperature, it is linearly heated from room temperature to 70-80°C within 3 minutes for the second dehydration treatment.

8. The anhydrous refining process of tea seed oil according to claim 7, characterized in that: In step 8, the second semi-finished tea seed oil after the second dehydration treatment is introduced into a deodorization tower with a vacuum degree of 0.1-0.5 MPa and a steam temperature of 150-180° C. to distill and remove the odor in the second semi-finished tea seeds.

9. A tea seed oil anhydrous refining equipment, characterized in that: The invention comprises a press, a pressure filter, a raw tea seed oil component analysis device, an activated carbon filter, a first stirred reactor, a first centrifugal separator, a second stirred reactor, a second centrifugal separator, a vacuum dehydrator, a deodorizing tower and a fine filter. The press physically presses tea seeds to obtain first raw tea seed oil. The first raw tea seed oil is passed through a pressure filter to remove solid cake impurities in the first raw tea seed oil to obtain second raw tea seed oil. The raw tea seed oil component analysis device analyzes the components of the second raw tea seed oil to obtain components of an activated carbon combination. The activated carbon combination is configured to be mixed with the raw tea seed oil in a first stirred reactor to obtain a first mixture and stirred. The first centrifugal separator separates the first mixture to obtain a first semi-finished tea seed oil. The first semi-finished tea seed oil is added to a second stirred reactor, and anhydrous ethanol is added to stir to obtain a second mixture. The second centrifugal separator separates the second mixture to obtain a second semi-finished tea seed oil. The second semi-finished tea seed oil is added to a vacuum dehydrator to remove ethanol and water. Then, the second semi-finished tea seed oil is added to a deodorizing tower to remove odor in the second semi-finished tea seed oil through steam distillation. Finally, the finished tea seed oil is filtered through a fine filter to obtain a finished tea seed oil.

10. The tea seed oil anhydrous refining equipment according to claim 9, characterized in that: The raw tea seed oil component analysis device includes an oil component analyzer, a memory and an industrial computer. The oil component analyzer is used to analyze the saturated fatty acid content, unsaturated fatty acid content and impurity content of the second raw tea seed oil. The memory is communicatively connected to the oil component analyzer to store the analysis result data. The industrial computer is communicatively connected to the memory. The industrial computer deploys a machine learning model, enters the analysis result data into the machine learning model, and the machine learning model outputs the component prediction result of the activated carbon combination.

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