Novel walnut oil processing method

Abstract

The invention discloses a novel walnut oil processing method, and relates to the technical field of walnut oil processing, and the novel walnut oil processing method comprises the following specific steps: step 1, pretreating walnuts; 2, material preparation treatment; step 3, putting the crushed raw materials into a hot constant-temperature oven, carrying out forced air drying on walnut kernel particles and walnut shell particle residues, then adjusting the temperature of the electric constant-temperature oven to 75-80 DEG C, and then squeezing by using a screw press to obtain crude oil; step 4, filtering residues of the crude oil; step five, walnut oil refining; step 6, decolorizing and deodorizing the walnut oil; step 7, promoting wax grease in the walnut oil to be condensed at low temperature, and removing the wax grease; step 8, adding an antioxidant composition into the walnut oil; and step 9, obtaining the finished product walnut oil. According to the novel walnut oil processing method, the process is simple, walnuts can be utilized to the maximum extent in the processing process, the oil yield is higher, decoloration is not needed, and walnut oil which is clear, transparent, bright in color and free of impurities can be obtained.

Description

Technical Field

[0001] The invention relates to the technical field of walnut oil processing, in particular to a novel walnut oil processing method. Background Art

[0002] Walnut oil is a vegetable oil squeezed from walnut kernels; it is an edible oil; the oil content of walnuts is as high as 65% to 70%, ranking first among all woody oils, and it is known as the "oil depot on trees"; modern technology is used to extract its essence, which is the new generation of walnut products - walnut oil; walnut oil is a natural fruit oil juice made from high-quality walnuts and internationally leading technology; in the international market, walnut oil is known as the "Oriental olive oil" and is as popular among consumers as olive oil.

[0003] The current processing method of walnut oil is relatively simple and traditional. Impurities exist in the finished walnut oil produced, which reduces the oil quality and affects the taste and shelf life of the walnut oil. In addition, the existing processing method does not make sufficient use of walnuts, resulting in high production costs. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a novel walnut oil processing method, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above purpose, the present invention is implemented by the following technical scheme: a new walnut oil processing method, comprising the following specific steps:

[0006] Step 1: Walnut pretreatment;

[0007] Step 2: Material preparation, the steps are as follows:

[0008] (1) blanching with sodium hydroxide at a temperature of 85-95° C., during which the heartwood is removed by flotation, and the addition ratio of sodium hydroxide is 0.1-1 g / L;

[0009] (2) Cool the walnut kernels with cold water and peel them;

[0010] (3) drying the walnut kernels and walnut shells, and then crushing them using a crusher, with the speed of the crusher set at 300-450 r / min;

[0011] (4) Low temperature vacuum drying, the water content is reduced to 5-8%;

[0012] Step 3: Put the raw materials with a particle size of 200-250 meshes into a hot constant temperature oven, then add walnut shell particle residues into the electric constant temperature oven, blow dry the walnut kernel particles and walnut shell particle residues, then adjust the temperature of the electric constant temperature oven to 75-80°C, and then use a screw press to squeeze to obtain crude oil, and the cake after the first squeezing is put into the second squeezing operation in the next squeezing operation;

[0013] Step 4: crude oil filter residue;

[0014] Step 5: Walnut oil refining, the specific steps are as follows:

[0015] (1) Degumming treatment, using hydration and acid refining methods to remove phospholipids, mucus, resins, and trace metals from crude oil;

[0016] (2) deacidification treatment;

[0017] (3) Dehydration treatment, using vacuum drying to remove water from the refined oil;

[0018] Step 6: Decolorization and deodorization of walnut oil, using adsorbent to remove pigments, colloids, and oxides in the oil, and the adsorbent is one or more of white clay, aluminum silicate, and activated carbon;

[0019] Using the vacuum air stripping principle, remove low molecular weight odor substances, free fatty acids, monoglycerides, glycolipids, sulfides, and thermal decomposition products of pigments in the oil;

[0020] Step 7: Use low temperature to condense the wax in the walnut oil and remove it;

[0021] Step 8: adding 0.08-0.1% by mass of an antioxidant composition to the walnut oil to achieve acid-base neutralization;

[0022] Step nine: Get the finished walnut oil.

[0023] Optionally, the specific steps of the walnut pretreatment are as follows:

[0024] (1) Optimizing the treatment to remove defective products with worm eyes and deformities and retain high-quality walnuts;

[0025] (2) Cleaning and drying;

[0026] (3) Crushing, shelling and separation: Use a crusher to crush the walnut shells and store the shells separately.

[0027] Optionally, the specific content of step (2) is as follows:

[0028] Soak the walnuts in warm water at 45-50°C until they cool to room temperature, then stir and scrub them to remove dirt on the surface of the walnuts. Then use a dryer to stir and dry the washed walnuts, and continue drying at 50-65°C for 3-4 hours until the moisture content of the walnuts is reduced to 3-5%.

[0029] Optionally, baking soda is added to the warm water, and the addition ratio of baking soda is 2-5g / L.

[0030] Optionally, in step 4, walnut shell particles and walnut skin fragments in the crude oil are removed by filtering with a filter membrane.

[0031] Optionally, the deacidification treatment in step 5 is specifically as follows:

[0032] A. After the temperature of the walnut oil drops to 28-32℃, add sodium hydroxide into the walnut oil;

[0033] B. Heat the crude oil and stir it while heating. Stop heating when the oil temperature reaches 68-72°C, let it stand for 4-6 hours, and then remove the crude oil supernatant;

[0034] C. Heat the crude oil again until the oil temperature rises to 68-72℃ again, add brine at a temperature of 80-85℃, and stir while adding. The mass ratio of brine added is 1-1.5:10. Then stop heating and let it settle for 2-4 hours.

[0035] Optionally, the antioxidant composition in step eight includes citric acid, vitamin E, and butylated hydroxyanisole; the mixing ratio thereof is 1-1.5:2-2.5:1.

[0036] The present invention provides a novel walnut oil processing method, which has the following beneficial effects:

[0037] The novel walnut oil processing method has a relatively simple process, and its processing can maximize the production capacity of walnuts, making the oil yield higher, indirectly reducing the production cost of walnut oil, and achieving sufficient filtering treatment during the processing process to reduce impurities in the oil, thereby obtaining walnut oil with bright color and no impurities. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] Embodiment 1: novel walnut oil processing method, comprising the following specific steps:

[0040] Step 1: Walnut pretreatment, the specific steps are as follows:

[0041] (1) Optimizing the treatment to remove defective products with worm eyes and deformities and retain high-quality walnuts;

[0042] (2) Cleaning and drying. The specific contents are as follows:

[0043] The walnuts were soaked in warm water at 47.3°C until cooled to room temperature and then stirred and scrubbed to remove dirt on the surface of the walnuts. The washed walnuts were then stirred and dried in a dryer at 58°C for 3.2 hours until the moisture content of the walnuts was reduced to 3.5%.

[0044] Add baking soda to warm water at a rate of 3g / L.

[0045] (3) crushing, shelling and separation, using a crusher to crush the walnut shells and store the shells separately;

[0046] Step 2: Material preparation, the steps are as follows:

[0047] (1) blanching with sodium hydroxide at a temperature of 89.3°C, during which the heartwood was removed by flotation, and the addition ratio of sodium hydroxide was 0.6 g / L;

[0048] (2) Cool the walnut kernels with cold water and peel them;

[0049] (3) drying the walnut kernels and walnut shells, and then crushing them using a crusher, with the speed of the crusher set at 360 r / min;

[0050] (4) Low temperature vacuum drying, the water content is reduced to 6.2%;

[0051] Step 3: Put the raw materials that meet the particle size of 200 mesh after crushing into a hot constant temperature oven, then add walnut shell particle residue into the electric constant temperature oven, blow dry the walnut kernel particles and walnut shell particle residue, then adjust the temperature of the electric constant temperature oven to 79.2°C, and then use a screw press to squeeze to obtain crude oil, and the cake after the first squeezing is put into the second squeezing operation in the next squeezing operation;

[0052] Step 4: Filter the crude oil residue, using a filter membrane to remove walnut shell particles and walnut skin fragments in the crude oil;

[0053] Step 5: Walnut oil refining, the specific steps are as follows:

[0054] (1) Degumming treatment, using hydration and acid refining methods to remove phospholipids, mucus, resins, and trace metals from crude oil;

[0055] (2) Deacidification treatment, the deacidification treatment is as follows:

[0056] A. After the temperature of the crude walnut oil drops to 29.1℃, add sodium hydroxide into the crude walnut oil;

[0057] B. Heat the crude oil and stir it while heating. After the oil temperature reaches 70°C, stop heating, let it stand and settle for 4.5 hours, and then remove the crude oil supernatant;

[0058] C. Heat the crude oil again until the oil temperature rises to 69°C again, add brine at a temperature of 82°C, and stir while adding. The mass ratio of brine added is 1.2:10. Then stop heating and let it stand for 2.5 hours;

[0059] (3) Dehydration treatment, using vacuum drying to remove water from the refined oil;

[0060] Step 6: Decolorization and deodorization of walnut oil, using adsorbent to remove pigments, colloids, and oxides in the oil, and the adsorbent is one or more of white clay, aluminum silicate, and activated carbon;

[0061] Using the vacuum air stripping principle, remove low molecular weight odor substances, free fatty acids, monoglycerides, glycolipids, sulfides, and thermal decomposition products of pigments in the oil;

[0062] Step 7: Use low temperature to condense the wax in the walnut oil and remove it;

[0063] Step 8: adding 0.09% by mass of an antioxidant composition to the walnut oil to achieve acid-base neutralization, wherein the antioxidant composition includes citric acid, vitamin E, and butylated hydroxyanisole; the mixing ratio thereof is 1.2:2.3:1;

[0064] Step nine: Get the finished walnut oil.

[0065] Embodiment 2: novel walnut oil processing method, comprising the following specific steps:

[0066] Step 1: Walnut pretreatment, the specific steps are as follows:

[0067] (1) Optimizing the treatment to remove defective products with worm eyes and deformities and retain high-quality walnuts;

[0068] (2) Cleaning and drying. The specific contents are as follows:

[0069] Soak the walnuts in warm water at 48°C until they cool to room temperature, then stir and scrub them to remove dirt on the surface of the walnuts. Then, stir and dry the washed walnuts in a dryer at 60°C for 3 hours until the moisture content of the walnuts is reduced to 5%.

[0070] Add baking soda to warm water at a rate of 4g / L.

[0071] (3) crushing, shelling and separation, using a crusher to crush the walnut shells and store the shells separately;

[0072] Step 2: Material preparation, the steps are as follows:

[0073] (1) blanching with sodium hydroxide at a temperature of 90° C., during which the heartwood is removed by flotation, and the addition ratio of sodium hydroxide is 0.8 g / L;

[0074] (2) Cool the walnut kernels with cold water and peel them;

[0075] (3) drying the walnut kernels and walnut shells, and then crushing them using a crusher, with the speed of the crusher set at 420 r / min;

[0076] (4) Low temperature vacuum drying, the water content is reduced to 5%;

[0077] Step 3: Put the raw materials with a particle size of 250 mesh after crushing into a hot constant temperature oven, then add walnut shell particle residue into the electric constant temperature oven, blow dry the walnut kernel particles and walnut shell particle residue, then adjust the temperature of the electric constant temperature oven to 75°C, and then use a screw press to squeeze to obtain crude oil, and the cake after the first squeezing is put into the second squeezing operation in the next squeezing operation;

[0078] Step 4: Filter the crude oil residue, using a filter membrane to remove walnut shell particles and walnut skin fragments in the crude oil;

[0079] Step 5: Walnut oil refining, the specific steps are as follows:

[0080] (1) Degumming treatment, using hydration and acid refining methods to remove phospholipids, mucus, resins, and trace metals from crude oil;

[0081] (2) Deacidification treatment, the deacidification treatment is as follows:

[0082] A. After the temperature of the walnut oil drops to 28°C, add sodium hydroxide into the walnut oil;

[0083] B. heating the crude oil, stirring it while heating, heating to an oil temperature of 68° C., stopping heating, standing and settling for 4 hours, and then removing the crude oil supernatant;

[0084] C. Heat the crude oil again until the oil temperature rises to 69°C, add brine at a temperature of 82.5°C, and stir while adding. The mass ratio of brine added is 1.35:10. Then stop heating and let it stand for 3 hours;

[0085] (3) Dehydration treatment, using vacuum drying to remove water from the refined oil;

[0086] Step 6: Decolorization and deodorization of walnut oil, using adsorbent to remove pigments, colloids, and oxides in the oil, and the adsorbent is one or more of white clay, aluminum silicate, and activated carbon;

[0087] Using the vacuum air stripping principle, remove low molecular weight odor substances, free fatty acids, monoglycerides, glycolipids, sulfides, and thermal decomposition products of pigments in the oil;

[0088] Step 7: Use low temperature to condense the wax in the walnut oil and remove it;

[0089] Step 8: adding 0.1% by weight of an antioxidant composition to the walnut oil to achieve acid-base neutralization, wherein the antioxidant composition includes citric acid, vitamin E, and butylated hydroxyanisole; the mixing ratio thereof is 1.5:2:1;

[0090] Step nine: Get the finished walnut oil.

[0091] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A novel walnut oil processing method, characterized in that: The specific steps include: Step 1: Walnut pretreatment; Step 2: Material preparation, the steps are as follows: (1) blanching with sodium hydroxide at a temperature of 85-95° C., during which the heartwood is removed by flotation, and the addition ratio of sodium hydroxide is 0.1-1 g / L; (2) Cool the walnut kernels with cold water and peel them; (3) drying the walnut kernels and walnut shells, and then crushing them using a crusher, with the speed of the crusher set at 300-450 r / min; (4) Low temperature vacuum drying, the water content is reduced to 5-8%; Step 3: Put the raw materials with a particle size of 200-250 meshes into a hot constant temperature oven, then add walnut shell particle residues into the electric constant temperature oven, blow dry the walnut kernel particles and walnut shell particle residues, then adjust the temperature of the electric constant temperature oven to 75-80°C, and then use a screw press to squeeze to obtain crude oil, and the cake after the first squeezing is put into the second squeezing operation in the next squeezing operation; Step 4: crude oil filter residue; Step 5: Walnut oil refining, the specific steps are as follows: (1) Degumming treatment, using hydration and acid refining methods to remove phospholipids, mucus, resins, and trace metals from crude oil; (2) deacidification treatment; (3) Dehydration treatment, using vacuum drying to remove water from the refined oil; Step 6: Decolorization and deodorization of walnut oil, using adsorbent to remove pigments, colloids, and oxides in the oil, and the adsorbent is one or more of white clay, aluminum silicate, and activated carbon; Using the vacuum air stripping principle, remove low molecular weight odor substances, free fatty acids, monoglycerides, glycolipids, sulfides, and thermal decomposition products of pigments in the oil; Step 7: Use low temperature to condense the wax in the walnut oil and remove it; Step 8: adding 0.08-0.1% by mass of an antioxidant composition to the walnut oil to achieve acid-base neutralization; Step nine: Get the finished walnut oil.

2. The novel walnut oil processing method according to claim 1, characterized in that: The specific steps of the walnut pretreatment are as follows: (1) Optimizing the treatment to remove defective products with worm eyes and deformities and retain high-quality walnuts; (2) Cleaning and drying; (3) Crushing, shelling and separation: Use a crusher to crush the walnut shells and store the shells separately.

3. The novel walnut oil processing method according to claim 2, characterized in that: The specific content of step (2) is as follows: Soak the walnuts in warm water at 45-50°C until they cool to room temperature, then stir and scrub them to remove dirt on the surface of the walnuts. Then use a dryer to stir and dry the washed walnuts, and continue drying at 50-65°C for 3-4 hours until the moisture content of the walnuts is reduced to 3-5%.

4. The novel walnut oil processing method according to claim 3, characterized in that: Soda ash is added into the warm water, and the adding ratio of the soda ash is 2-5 g / L.

5. The novel walnut oil processing method according to claim 1, characterized in that: In step 4, the walnut shell particles and walnut skin fragments in the crude oil are removed by filtering with a filter membrane.

6. The novel walnut oil processing method according to claim 1, characterized in that: The deacidification treatment in step 5 is specifically as follows: A. After the temperature of the walnut oil drops to 28-32℃, add sodium hydroxide into the walnut oil; B. Heat the crude oil and stir it while heating. Stop heating when the oil temperature reaches 68-72°C, let it stand for 4-6 hours, and then remove the crude oil supernatant; C. Heat the crude oil again until the oil temperature rises to 68-72℃ again, add brine at a temperature of 80-85℃, and stir while adding. The mass ratio of brine added is 1-1.5:

10. Then stop heating and let it settle for 2-4 hours.

7. The novel walnut oil processing method according to claim 1, characterized in that: The antioxidant composition in step eight includes citric acid, vitamin E, and butylated hydroxyanisole; the mixing ratio thereof is 1-1.5:2-2.5:1.