A solid fat and a method for preparing the same

Abstract

The present application relates to a kind of solid fat used as seed crystal, the solid fat includes 0.1%~1.5% of butanone insoluble substance by total mass of the solid fat.The solid fat is the first solid fat obtained after the palm stearin is used as seed crystal and the rice oil is defatted, and the second solid fat is obtained by one-stage cooling, two-stage cooling and solid-liquid separation.Using the second solid fat as seed crystal to defat edible oil can reduce the back color phenomenon of vegetable oil and improve the shelf life stability.

Description

Technical Field

[0001] This invention belongs to the field of oil and fat technology, specifically, it relates to a method for processing vegetable oil, and more specifically, it relates to a method for processing or preparing rice bran oil. Background Technology

[0002] Rice bran is rich in nutrients, containing various physiologically active ingredients with health benefits, and is hailed as a "natural treasure trove of nutrients." Rice bran oil is a deep-processed product of rice bran, with a relatively balanced fatty acid composition that closely resembles human dietary recommendations. It is also rich in vitamin E, squalene, sitosterol, and ferulic acid, making it an internationally recognized natural and healthy oil. Studies show that long-term consumption of rice bran oil has significant effects on preventing cardiovascular disease, improving immunity, and regulating blood sugar. Therefore, rice bran oil is highly favored by consumers.

[0003] Rice bran oil has a high solid fat content, which easily leads to solid precipitation at low temperatures, causing it to become cloudy. The common method is to degrease the rice bran oil, which involves cooling and crystallizing the oil to remove the high-melting-point solid fat components. The resulting liquid oil can remain clear and transparent during shelf storage. However, the rice bran solid fat separated during degreasing has a pasty appearance and cannot be sold as a regular liquid edible oil, resulting in a lower overall yield and reduced production capacity. Therefore, there is a need for a simple, economical, and practical method for recycling and reusing this degreasing byproduct.

[0004] Finished oils obtained from oilseed refining are colorless and transparent to pale yellow. During transportation and storage, the color of the oil changes; this phenomenon is called oil color reversion or oil color recovery. Many factors contribute to this phenomenon, including raw materials, pretreatment, refining processes, and storage conditions. Oil oxidation and certain byproducts in the oil are significant factors causing color reversion. The color of vegetable oil is the most direct sensory factor; therefore, preventing color changes in vegetable oils is a problem that processing companies and researchers urgently need to solve. Summary of the Invention

[0005] The problem the invention aims to solve

[0006] Existing technologies have problems with vegetable oils easily reverting to their original color, and the solid fats obtained from defatting rice bran oil cannot be reused, resulting in a waste of raw materials.

[0007] Solution for solving the problem

[0008] This invention provides a process for recycling and reusing the solids obtained from rice bran oil defatting. The method involves treating the solids obtained from rice bran oil defatting with special treatment, and using the recycled solids as seed crystals for degreasing vegetable oils. This can improve the color stability of oils and recycle the solids separated during the rice bran oil defatting process.

[0009] We unexpectedly discovered that by using palm stearin (45-58 degrees Celsius) as a seed crystal to defatt rice bran oil, and subjecting the resulting solids to a specific heating and cooling process, the solids obtained have a butanone insoluble content of 0.1%-1.5%. Using these solids as seed crystals to defatt vegetable oils can reduce the color reversion phenomenon of vegetable oils and improve shelf-life stability.

[0010] That is, the present invention is as follows:

[0011] The first aspect of the present invention provides a solid resin used as a seed crystal, wherein the solid resin contains 0.1% to 1.5% butanone-insoluble matter based on the total mass of the solid resin.

[0012] In one or more specific embodiments, the solid fat contains 1.0% to 1.5% butanone-insoluble matter.

[0013] A second aspect of the present invention provides a method for preparing a solid resin used as a seed crystal, the method comprising the following steps:

[0014] a. Based on the total mass of rice bran oil, add 0.1% to 5% palm stearin to the rice bran oil, defatted, to obtain the first solid fat;

[0015] b. Recycling: The first solid resin is heated to break down crystals, then cooled in one stage and in two stages to separate the solid and liquid, obtaining the second solid resin used as a seed crystal;

[0016] The cooling process involves cooling the first solid resin after heating and crystallization to 35-45°C at a cooling rate of 3-5°C / h; preferably to 40-45°C at a cooling rate of 4-5°C / h.

[0017] The second-stage cooling involves cooling the first solid resin, after the first-stage cooling, to 25-35°C at a cooling rate of 1-3°C / h; preferably, to 28-32°C at a cooling rate of 1.5-2.5°C / h.

[0018] In one or more specific embodiments, in step a, the palm stearin is palm stearin with a melting point of 45-58°C; preferably, the degreasing includes heating to break up crystals, cooling to 0-8°C, and solid-liquid separation.

[0019] In one or more specific embodiments, the heating to break down crystals involves heating the grease to above 60°C.

[0020] The third aspect of the present invention provides a second solid resin obtained according to any specific embodiment.

[0021] The fourth aspect of the present invention provides a method for degreasing oils, using the solid fat described in any specific embodiment as a seed crystal, or using the second solid fat prepared in any specific embodiment as a seed crystal for degreasing.

[0022] In one or more specific embodiments, the amount of seed crystals added is 0.1% to 5% of the total mass of the oil to be defatted;

[0023] Preferably, the oil is a vegetable oil; preferably, the oil is selected from one or more of palm oil, soybean oil, sunflower seed oil, peanut oil, rapeseed oil, cottonseed oil, corn oil, safflower seed oil, sesame oil, rice bran oil, flaxseed oil, olive oil, hazelnut oil, pecan oil, almond oil, cashew oil, macadamia nut oil, pistachio oil, palm kernel oil, and coconut oil.

[0024] The fifth aspect of the present invention provides oils prepared by the method described in any specific embodiment.

[0025] The sixth aspect of the present invention provides the application of a solid fat described in any specific embodiment, or a second solid fat prepared using any specific embodiment, in improving the color return phenomenon of oils.

[0026] The effects of the invention

[0027] a) Using the seed crystals described in this application or the degreasing method described in this application can improve the color stability of vegetable oils and maintain product shelf stability.

[0028] b) The rice bran oil degreasing byproducts that cannot be utilized under this application can be recovered by using the seed crystals described in this application or by using the degreasing method described in this application. Detailed Implementation

[0029] The present invention will now be described in detail. The description of the technical features described below is based on representative embodiments and specific examples of the present invention, but the present invention is not limited to these embodiments and specific examples. It should be noted that:

[0030] In this specification, the range of values ​​referred to as "value A to value B" refers to the range including the endpoint values ​​A and B.

[0031] In this specification, the numerical range indicated by "above" or "below" refers to the numerical range that includes the stated number.

[0032] In this specification, the word "may" has two meanings: to perform a certain process and not to perform a certain process.

[0033] In this specification, the terms "optional" or "optional" are used to indicate the use or omission of certain substances, components, procedures, application conditions, etc.

[0034] All unit names used in this manual are international standard unit names, and unless otherwise stated, the "%" used refers to weight or mass percentage content.

[0035] Unless otherwise stated in this specification, "multiple (types)" means having two or more types.

[0036] In this specification, references to "some specific / preferred embodiments," "other specific / preferred embodiments," "implementation," etc., refer to specific elements (e.g., features, structures, properties, and / or characteristics) related to that embodiment, which are included in at least one of the embodiments described herein and may or may not be present in other embodiments. Furthermore, it should be understood that these elements may be combined in any suitable manner in various embodiments.

[0037] In this instruction manual, the term "solid fat" is the same as "stearin," referring to lipids with a high melting point that are solid or semi-solid at room temperature.

[0038] In this instruction manual, "rice bran solid lipids" refers to solid or semi-solid lipids with high melting points that are removed during the refining process of rice bran oil.

[0039] In this specification, the term "seed crystal" refers to an additive used in crystallization processes that can form crystal nuclei, thereby accelerating or promoting the growth of enantiomers with the same crystal form or stereostructure.

[0040] The term "butanone insoluble matter" as used in this instruction manual refers to substances that are immiscible when mixed with a saturated butanone solution at room temperature and can be separated by filtration.

[0041] The "palm stearin with a melting point of 45 to 58°C" mentioned in this specification refers to the solid portion extracted from palm oil after freeze crystallization, which has a melting point of 45 to 58°C.

[0042] [Solid resin used as a seed crystal]

[0043] The present invention discloses a solid resin used as a seed crystal, wherein the solid resin contains 0.1% to 1.5% methyl ethyl ketone (MEK) insolubles based on the total mass of the solid resin; preferably, it contains 1.0% to 1.5% MEK insolubles.

[0044] The melting point of the solid fat is 45–58°C, preferably 50–54°C. The fatty acid composition of the solid fat is: palmitic acid 55%–60%, oleic acid 3–8%, linoleic acid 25–30%, and the content of the remaining fatty acids is less than 1.5%.

[0045] Preparation method of the solid resin used as a seed crystal

[0046] This invention also discloses a method for preparing a solid resin used as a seed crystal, the method comprising the following steps:

[0047] a. Based on the total mass of rice bran oil, add 0.1% to 5% palm stearin to the rice bran oil, defatted, to obtain the first solid fat;

[0048] b. Recycling: The first solid resin is heated to break down crystals, then cooled in one stage and in two stages to separate the second solid resin, which is used as a seed crystal.

[0049] The cooling process involves cooling the first solid resin after heating and crystallization to 35-45°C at a cooling rate of 3-5°C / h; preferably to 40-45°C at a cooling rate of 4-5°C / h.

[0050] The second-stage cooling involves cooling the first solid resin, after the first-stage cooling, to 25-35°C at a cooling rate of 1-3°C / h; preferably, to 28-32°C at a cooling rate of 1.5-2.5°C / h.

[0051] In step a, the palm stearin is palm stearin with a melting point of 45°C to 58°C; preferably, the degreasing includes heating to break up crystals, cooling to 0°C to 8°C, and separation.

[0052] The second solid fat can be used as a seed crystal; especially as a seed crystal in the process of degreasing oils.

[0053] In this invention, the rice bran oil to be defatted is referred to as raw rice bran oil, and its source is not particularly limited; conventional undefatted rice bran oil raw materials are acceptable. Specifically, the rice bran oil used in this invention is crude rice bran oil that has undergone one or more of the degumming and deacidification processes. There are no particular limitations on the degumming and deacidification processes and conditions; conventional operations are sufficient. Degumming methods can be selected from hydration degumming, acid refining degumming, enzymatic degumming, etc. In some specific embodiments, hydration degumming includes a step of degumming with hot water at 70–90°C. Additionally, for acid degumming, for example, heating degumming can be performed in the presence of phosphoric acid or citric acid. Deacidification methods can be selected from alkali refining, distillation, solvent extraction, esterification, etc. The alkali used in the deacidification process includes alkali metal hydroxides (such as caustic soda NaOH, lime Ca(OH)2) or alkali metal carbonates, such as sodium carbonate (commonly known as soda ash). In some specific implementation schemes, the amount of alkali used is 5-20% higher than its theoretical alkali usage, which is the theoretical amount of alkali used to neutralize the acid value of the oil to be treated, calculated based on the acid value of the oil.

[0054] This invention does not have a particular limitation on the source of palm stearin used; it can be obtained through conventional methods or by directly purchasing commercially available products. The palm stearin can be obtained by conventional fractionation of palm oil, and the fractionation method can be dry fractionation, solvent fractionation, etc., so that the melting point of the obtained palm stearin is within the range of 45°C to 58°C defined in this invention.

[0055] In some specific embodiments of the present invention, the melting point of the aforementioned palm stearin can be 45–58°C, preferably 50–56°C, and more preferably 51–54°C. It should be noted that, in the present invention, the melting point refers to the apparent melting point of the palm stearin used. That is, when palm stearin comprises only one component, the melting point of palm stearin is the melting point of that component, and the value of the melting point can be determined by DSC (Differential Scanning Calorimetry) scanning; when palm stearin comprises two or more components, the melting point of palm stearin is the apparent melting point of the mixture, and the apparent melting point can be determined by the peak temperature of the curve obtained by DSC (Differential Scanning Calorimetry) scanning and mathematical fitting.

[0056] Furthermore, in some preferred embodiments, the content of palmitic acid (16:0) or stearic acid (C18:0) in the fatty acid composition of the palm stearin of the present invention is 60% or more, more preferably 70% or more, and even more preferably 80% or more. Regarding the use of these substances, in some specific embodiments, they can be directly added to the raw rice bran oil obtained after heat treatment, or the palm stearin can be added to the raw rice bran oil in a liquid state by preheating. Optionally, the above-mentioned palm stearin can be added under stirring conditions.

[0057] Furthermore, the present invention does not impose any particular restrictions on the timing of adding palm stearin; it can be added at any one or more times before, during, or after the heating step of the raw rice bran oil described above. Regarding the amount of palm stearin added, in some specific embodiments, based on the total mass of the raw rice bran oil, the amount of palm stearin added is 0.1% to 5% of the mass of the oil to be defatted, preferably 1% to 3%. Insufficient palm stearin may lead to excessively long crystal formation time or excessively small crystal particle size; excessive palm stearin may cause the final crystals to aggregate, which may be detrimental to subsequent processing.

[0058] In this invention, the degreasing is a conventional degreasing process, which includes heating to break down crystals and cooling. There are no particular limitations on the specific degreasing process. For example, the degreasing temperature, time, and solid-liquid separation method can all be conventionally adjusted.

[0059] The raw rice bran oil is heated to eliminate any solid precipitates that may be present, essentially turning it into a homogeneous liquid. These solid precipitates typically include waxes and saturated fatty acid esters of glycerol. These substances exist or remain within the oil as crystals or crystal nuclei and may solidify or crystallize as the storage time at room temperature or under refrigeration increases, leading to turbidity. Furthermore, the heating process also eliminates the thermodynamic history of the raw rice bran oil.

[0060] There are no particular restrictions on the heating temperature in principle. In some specific embodiments of the present invention, heat treatment can be performed by heating the raw material rice bran oil to above 60°C. In some preferred embodiments, the heating temperature can be 60°C to 80°C, preferably 60°C to 65°C. If the heating temperature is too low, there is a concern that the dissolution time of the fine crystal nuclei inside the oil may be too long, thus affecting the processing efficiency.

[0061] There is no specific limit to the heating time, but from the perspective of improving production efficiency, the heating time should be 10–40 minutes, preferably 15–30 minutes. Excessive heating time may compromise the quality of the oil, even if it fully dissolves the fine crystal nuclei.

[0062] Furthermore, the present invention does not impose any particular limitation on the starting temperature of heating. In some specific embodiments, the raw rice bran oil can be heated from room temperature. In other embodiments, for the purpose of fully dissolving solid precipitates, especially fine crystal nuclei, the raw rice bran oil can also be preheated. For example, the raw rice bran oil can be preheated from room temperature to below 60°C. Preferably, the preheating end temperature can be maintained for a period of time (e.g., 1-3 hours), and then the rice bran oil can be heated to above 65°C for heat treatment.

[0063] Furthermore, the heating rate in the heating step is not particularly required and can be 1–20 °C / min, preferably 5–10 °C / min. For the heating step of this invention, any auxiliary equipment or means can be used as needed; for example, mechanical stirring or electromagnetic stirring can be used to accelerate the dissolution of residual solid precipitates.

[0064] In step a, during the degreasing process, the heated raw rice bran oil is cooled to 0–8°C, preferably 2–4°C. This cooling process allows for the formation of crystal nuclei in the rice bran oil with the aid of palm stearin, promoting the precipitation of high-melting-point fractions and rapidly completing the degreasing process.

[0065] The cooling rate of the cooling process is not particularly limited, but it is preferable to obtain crystals with favorable morphology by controlling the cooling program. Cooling at a rate of 3°C / h or higher is preferred, and rapid cooling is also considered advantageous. Therefore, in preferred technical solutions, the cooling rate can be 5°C / h or higher, 10°C / h or higher, 20°C / h or higher, 40°C / h or higher, or 50°C / h or higher, etc. There is no particular limitation on the upper limit of the cooling rate; under normal equipment conditions, it can be below 60°C / h or below 55°C / h, etc. There is no particular limitation on the cooling time, but from the perspective of improving production efficiency, the cooling time is 10–40 min, preferably 15–30 min.

[0066] The first and second stages of cooling can be performed using conventional cooling methods and equipment, such as cooling in a temperature-controlled bath, crystal growth tank, or temperature-controlled freezer, as long as the temperature and cooling rate specified in this invention can be achieved.

[0067] This invention does not impose any particular limitations on the solid-liquid separation method. Conventional separation methods can be used under conditions not exceeding 5°C, such as filtration, filtration with a pressure reducing device, and centrifugation. To improve separation efficiency, centrifugation is preferred for solid-liquid separation. The process can be carried out at a speed of 5000–10000 rpm for no more than 50 minutes. After centrifugation, a clear rice bran oil liquid is obtained.

[0068] Methods for defatting oil and fat

[0069] The present invention also discloses a method for degreasing oils, using a solid fat containing 0.1% to 1.5% butanone-insoluble matter as described in any embodiment, or using a second solid fat prepared in any embodiment as a seed crystal to degrease the oils.

[0070] There are no particular limitations on the type of oil to be defatted; it can be any edible oil, preferably vegetable oil. Specifically, the oil is selected from one or more of the following: palm oil, soybean oil, sunflower oil, peanut oil, rapeseed oil, cottonseed oil, corn oil, safflower oil, sesame oil, rice bran oil, flaxseed oil, olive oil, hazelnut oil, pecan oil, almond oil, cashew oil, macadamia nut oil, pistachio oil, palm kernel oil, and coconut oil.

[0071] In one or more specific embodiments, the amount of seed crystals added is 0.1 to 5% of the total mass of the oil to be defatted, preferably 0.5 to 3%.

[0072] In one or more specific embodiments, a second solid fat is used to degrease the oil to be degreased using a conventional degreasing process, including heating, cooling, and separation.

[0073]

grease

[0074] This invention also discloses an oil obtained by degreasing an oil containing 0.1% to 1.5% butanone-insoluble solids or a second solid fat in any embodiment. The oil not only achieves the effect of conventional degreasing but also exhibits less color reversion. After accelerated testing, the color change ΔR of the oil is below 2.7, which is superior to oil products obtained by degreasing with commonly used seed crystals, such as palm stearin, in the prior art.

[0075] The oil and fat undergo no specific processing steps other than degreasing. The oil and fat can be conventionally refined, such as through one or more processes including degumming, deacidification, decolorization, and deodorization. There are no particular limitations on refining steps other than degreasing.

[0076]

application

[0077] The present invention also discloses the application of the second solid fat prepared in any embodiment in improving the color recovery phenomenon of oils.

[0078] Existing technologies produce oils with a color difference ΔR greater than 3 before and after accelerated testing, while oils prepared using the degreasing method described in this application have a color difference ΔR less than 2.7. The solid fat described in this application, used as a seed crystal for degreasing oils, can significantly reduce color reversion, improve shelf-life stability, and enhance the sensory properties of the oils.

[0079] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified, specific conditions in the examples are performed under conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, all materials and instruments used are commercially available conventional products. Furthermore, in the examples, unless otherwise specified, "parts" are based on weight.

[0080] Example

[0081] raw material:

[0082] Defatted rice bran oil: Yihai Kerry (Wuhan) Grain and Oil Industry Co., Ltd.

[0083] Defatted corn oil: Yihai Kerry (Yanzhou) Grain and Oil Industry Co., Ltd.

[0084] Defatted sunflower seed oil: Shanghai Kerry Foods Co., Ltd.

[0085] Peanut oil to be defatted: Yihai Kerry (Qingdao) Food Industry Co., Ltd.

[0086] Defatted soybean oil: Shanghai Kerry Foods Co., Ltd.

[0087] Palm stearin at 40-58℃: Guangzhou Libai Enterprise Group Co., Ltd.

[0088] Rice bran wax: Yihai Kerry (Panjin) Grain and Oil Industry Co., Ltd.; melting point: 75℃

[0089] Palm wax: Shanghai Weiqing Biotechnology Co., Ltd.; melting point: 83℃

[0090] equipment:

[0091] BSA224S Analytical Balance: Sartorius Scientific Instruments Ltd.

[0092] TLDCW-3011C Precision Programmable Temperature Bath: Jiangsu Tianling Instrument Co., Ltd.

[0093] JB90-S Electric Mixer: Shanghai Meiyingpu Instrument Manufacturing Co., Ltd.

[0094] 5417R centrifuge: Eppendorf GmbH, Germany

[0095] Detection method:

[0096] Color enhancement value (△R):

[0097] 1) The seed crystals obtained in different embodiments were added to the undegreased vegetable oil shown in Table 1 at a ratio of 2%, and the mixture was heated to 60 degrees Celsius to break the crystals and dissolve them.

[0098] 2) Add the above mixture to a crystallization tank, then cool it to 40°C at a cooling rate of 40°C / h, then cool it to 30°C at a cooling rate of 5°C / h, then cool it to 18°C ​​at a cooling rate of 3°C / h, and finally cool it to 3°C at a cooling rate of 2°C / h to obtain defatted vegetable oil.

[0099] 3) Place the defatted vegetable oil obtained above into an oven at 105℃ for accelerated testing. After 6 hours, take out the sample and compare the color change ΔR (Lovibond colorimetric method, red value R, refer to GB / T22460—2008) before and after acceleration.

[0100] Butanone insolubles:

[0101] The detection method is an improvement upon the method described in the literature "Determination of Wax Content in High Acid Value Crude Rice Oil - Improved Method for Determination of Butanone Insoluble Matter". Weigh 50g of oil sample (accurate to 0.01g) into a beaker, and add saturated butanone (500g butanone to 55g distilled water) at a mass ratio of oil sample to butanone of 1:5. Stir thoroughly and let stand. Then filter the sample through pre-dried and weighed filter paper, washing the filter paper with saturated butanone until no oil residue remains. Place the wax-containing filter paper (i.e., filter paper with butanone insoluble matter) in an oven and dry it at 110℃ until constant weight, then weigh it. The butanone insoluble matter content is calculated as the increase in weight of the filter paper after drying divided by the weight of the sample.

[0102] Example 1:

[0103] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0104] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0105] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0106] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0107] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0108] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0109] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0110] Example 2:

[0111] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0112] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0113] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0114] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0115] Cooling in one stage: Cooling to 40℃ at a rate of 3℃ / h.

[0116] Second-stage cooling: The temperature is then reduced to 30°C at a rate of 2°C / h.

[0117] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0118] Example 3:

[0119] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0120] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0121] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0122] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0123] Cooling in one stage: Cooling down to 40℃ at a rate of 5℃ / h.

[0124] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0125] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0126] Example 4:

[0127] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0128] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0129] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0130] 4. Reheat the first solid resin to 60 degrees Celsius to break the crystals, then cool it down to 35 degrees Celsius at a rate of 4 degrees Celsius / h, and then cool it down to 30 degrees Celsius at a rate of 2 degrees Celsius / h.

[0131] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0132] Example 5:

[0133] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0134] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0135] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0136] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0137] Cooling in one stage: Cooling to 45℃ at a rate of 4℃ / h.

[0138] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0139] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0140] Example 6:

[0141] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0142] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0143] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0144] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0145] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0146] Two-stage cooling: Cool down to 30℃ at a rate of 1℃ / h.

[0147] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0148] Example 7:

[0149] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60°C to break the crystals.

[0150] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0151] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0152] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0153] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0154] Two-stage cooling: Cool down to 30℃ at a rate of 3℃ / h.

[0155] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid phase.

[0156] Example 8:

[0157] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0158] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0159] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0160] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0161] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0162] Two-stage cooling: Cool down to 25℃ at a rate of 3℃ / h.

[0163] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid phase.

[0164] Example 9:

[0165] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0166] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0167] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0168] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0169] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0170] Two-stage cooling: Cool down to 35℃ at a rate of 3℃ / h.

[0171] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid phase.

[0172] Example 10:

[0173] 1. Under stirring conditions, add 0.1% by weight (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0174] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0175] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0176] 4. Recycling: The solid resin before recycling is reheated to 60 degrees Celsius to break down the crystals.

[0177] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0178] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0179] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0180] Example 11:

[0181] 1. Under stirring conditions, add 5% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0182] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0183] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0184] 4. Recycling: The solid resin before recycling is reheated to 60 degrees Celsius to break down the crystals.

[0185] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0186] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0187] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0188] Example 12:

[0189] 1. Under stirring conditions, add 1.5% by weight (based on the total mass of the rice bran oil to be defatted) of 45-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0190] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0191] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0192] 4. Recycling: The solid resin before recycling is reheated to 60 degrees Celsius to break down the crystals.

[0193] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0194] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0195] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0196] Example 13:

[0197] 1. Under stirring conditions, add 1.5% by weight (based on the total mass of the rice bran oil to be defatted) of 58°C palm stearin to the rice bran oil to be defatted, and heat to 60°C to break the crystals.

[0198] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0199] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0200] 4. Recycling: The solid resin before recycling is reheated to 60 degrees Celsius to break down the crystals.

[0201] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0202] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0203] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0204] Example 14:

[0205] 1. Under stirring conditions, add 1.5% by weight (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0206] 2. Then, cool down to 30℃ at a rate of 40℃ / h, then to 20℃ at a rate of 5℃ / h, then to 15℃ at a rate of 3℃ / h, and finally to 2℃ at a rate of 2℃ / h.

[0207] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0208] 4. Recycling: The solid resin before recycling is reheated to 60 degrees Celsius to break down the crystals.

[0209] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0210] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0211] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0212] Example 15:

[0213] 1. Under stirring conditions, add 1.5% by weight (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0214] 2. Then, cool down to 40℃ at a cooling rate of 30℃ / h, then to 30℃ at a cooling rate of 3℃ / h, then to 18℃ at a cooling rate of 2℃ / h, and finally to 3℃ at a cooling rate of 1℃ / h.

[0215] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0216] 4. Recycling: The solid resin before recycling is reheated to 60 degrees Celsius to break down the crystals.

[0217] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0218] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0219] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0220] Example 16:

[0221] 1. Under stirring conditions, add 1.5% by weight (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0222] 2. Then cool down to 40℃ at a cooling rate of 40℃ / h, and then cool down to 3℃ at a cooling rate of 3℃ / h.

[0223] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0224] 4. Recycling: The solid resin before recycling is reheated to 60 degrees Celsius to break down the crystals.

[0225] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0226] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0227] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0228] Comparative Example 1:

[0229] 1.52 degrees palm stearin can be used directly as a seed crystal.

[0230] Comparative Example 2:

[0231] 1. Under stirring conditions, heat the rice bran oil to be defatted to 60 degrees Celsius to break the crystals.

[0232] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0233] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is rice bran sesame oil, which can be used directly as seed crystals.

[0234] Comparative Example 3:

[0235] 1. Under stirring conditions, heat the rice bran oil to be defatted to 60 degrees Celsius to break the crystals.

[0236] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0237] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0238] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0239] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0240] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0241] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid phase.

[0242] Comparative Example 4:

[0243] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0244] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0245] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid resin, which is used as a seed crystal.

[0246] Comparative Example 5:

[0247] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0248] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0249] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0250] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0251] Cooling in one stage: Cooling to 40℃ at a rate of 2℃ / h.

[0252] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0253] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid phase.

[0254] Comparative Example 6:

[0255] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0256] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0257] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0258] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0259] Cooling in one stage: Cooling down to 40℃ at a rate of 6℃ / h.

[0260] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0261] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid phase.

[0262] Comparative Example 7:

[0263] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0264] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0265] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0266] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0267] Cooling in one stage: Cooling down to 32℃ at a rate of 4℃ / h.

[0268] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0269] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid phase.

[0270] Comparative Example 8:

[0271] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0272] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0273] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0274] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0275] Cooling in one stage: Cooling to 45℃ at a rate of 4℃ / h.

[0276] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0277] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid phase.

[0278] Comparative Example 9:

[0279] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0280] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0281] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0282] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0283] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0284] Second-stage cooling: Cool down to 30℃ at a rate of 0.5℃ / h.

[0285] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid phase.

[0286] Comparative Example 10:

[0287] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0288] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0289] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0290] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0291] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0292] Second-stage cooling: Cool down to 30℃ at a rate of 4℃ / h.

[0293] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid phase.

[0294] Comparative Example 11:

[0295] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0296] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0297] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0298] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0299] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0300] Two-stage cooling: Cool down to 20℃ at a rate of 4℃ / h.

[0301] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid phase.

[0302] Comparative Example 12:

[0303] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0304] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0305] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0306] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0307] Cooling in one stage: Cooling down to 45℃ at a rate of 4℃ / h.

[0308] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid phase.

[0309] Comparative Example 13:

[0310] 1. Under stirring conditions, add 2% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0311] 2. Then cool down to 40℃ at a cooling rate of 40℃ / h, and then cool down to 30℃ at a cooling rate of 5℃ / h.

[0312] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0313] Comparative Example 14:

[0314] 1. Under stirring conditions, add 0.01% by weight (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0315] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0316] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0317] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0318] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0319] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0320] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0321] Comparative Example 15:

[0322] 1. Under stirring conditions, add 6% by mass (based on the total mass of the rice bran oil to be defatted) of 52-degree palm stearin to the rice bran oil to be defatted, and heat to 60 degrees to break the crystals.

[0323] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0324] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0325] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0326] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0327] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0328] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0329] Comparative Example 16:

[0330] 1. Under stirring conditions, add 1.5% by weight (based on the total mass of the rice bran oil to be defatted) of 40°C palm stearin to the rice bran oil to be defatted, and heat to 60°C to break the crystals.

[0331] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0332] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0333] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0334] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0335] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0336] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0337] Comparative Example 17:

[0338] 1. Under stirring conditions, add 1.5% rice bran wax to the rice bran oil to be defatted, and heat to 60 degrees Celsius to break the crystals.

[0339] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0340] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0341] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0342] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0343] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0344] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0345] Comparative Example 18:

[0346] 1. Under stirring conditions, add 1.5% by mass (based on the total mass of the rice bran oil to be defatted) of beeswax to the rice bran oil to be defatted, and heat to 60 degrees Celsius to break the crystals.

[0347] 2. Then, cool down to 40℃ at a cooling rate of 40℃ / h, then to 30℃ at a cooling rate of 5℃ / h, then to 18℃ at a cooling rate of 3℃ / h, and finally to 3℃ at a cooling rate of 2℃ / h.

[0348] 3. Centrifuge at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase after centrifugation is the first solid phase.

[0349] 4. Recycling: The first solid resin is reheated to 60 degrees Celsius to break down the crystals.

[0350] Cooling in one stage: Cooling to 40℃ at a rate of 4℃ / h.

[0351] Two-stage cooling: Cool down to 30℃ at a rate of 2℃ / h.

[0352] 5. Centrifuge again at 4℃ for 30 minutes at a speed of 8000 rpm. The solid phase obtained after centrifugation is the second solid lipid.

[0353] The solid fats obtained in the above examples and comparative examples were used as seed crystals according to the table below, and the color enhancement value (ΔR) and methyl ethyl ketone (MEK) insoluble content were tested using the methods described above. The test results are shown in the table below. Table 1 Seed crystals obtained in Examples 1-16 and Comparative Examples 1-18, oils using seed crystals, MEK insoluble content of seed crystals, and color enhancement value of defatted oils.

[0354]

[0355]

[0356]

[0357] In summary, in the results of the above embodiments, the content of butanone-insoluble matter in the recovered solids was in the range of 0.1% to 1.5%. By adding these solids to degrease the oil samples, the color change (ΔR) of the oil samples in the stability evaluation experiment was low, in the range of 1.1 to 2.7, while the comparative samples were all above 3.0. This indicates that the recovered solids treated by the method of this invention can make the color of the oil samples after degreasing more stable and less prone to color reversal.

[0358] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A solid resin used as a seed crystal, characterized in that, Based on the total mass of the solid fat, the solid fat contains 0.1% to 1.5% butanone-insoluble matter.

2. The solid resin as described in claim 1, characterized in that, The solid fat contains 1.0% to 1.5% butanone-insoluble matter.

3. A method for preparing a solid resin used as a seed crystal, characterized in that, The method includes the following steps: a. Based on the total mass of rice bran oil, add 0.1% to 5% palm stearin to the rice bran oil, defatted, to obtain the first solid fat; b. Recycling: The first solid resin is heated to break down crystals, and after a first cooling stage, a second cooling stage, and solid-liquid separation, a second solid resin is obtained to be used as a seed crystal. The cooling process involves cooling the first solid resin after heating and crystallization to 35-45°C at a cooling rate of 3-5°C / h; preferably to 40-45°C at a cooling rate of 4-5°C / h. The second-stage cooling involves cooling the first solid resin, after the first-stage cooling, to 25-35°C at a cooling rate of 1-3°C / h; preferably, to 28-32°C at a cooling rate of 1.5-2.5°C / h.

4. The method as described in claim 3, characterized in that, In step a, the palm stearin is palm stearin with a melting point of 45-58°C; preferably, the degreasing includes heating to break up crystals, cooling to 0-8°C, and solid-liquid separation.

5. The method as described in claim 3, characterized in that, The heating and crystal breaking process involves heating the oil to above 60°C.

6. The second solid resin obtained according to any one of claims 3 to 5.

7. A method for defatting oils, characterized in that, The defatted oil is degreased using the solid fat described in any one of claims 1 to 2 and 6 as a seed crystal, or using the second solid fat prepared in any one of claims 3 to 5 as a seed crystal.

8. The method as described in claim 7, characterized in that, The amount of seed crystals added is 0.1% to 5% of the total mass of the oil to be degreased; Preferably, the oil is a vegetable oil; preferably, the oil is selected from one or more of palm oil, soybean oil, sunflower seed oil, peanut oil, rapeseed oil, cottonseed oil, corn oil, safflower seed oil, sesame oil, rice bran oil, flaxseed oil, olive oil, hazelnut oil, pecan oil, almond oil, cashew oil, macadamia nut oil, pistachio oil, palm kernel oil, and coconut oil.

9. The oil prepared by the method described in claim 7 or 8.

10. The application of the solid resin used as a seed crystal according to any one of claims 1 to 2, 6, or the second solid resin prepared according to any one of claims 3 to 5, in improving the color return phenomenon of oils and fats.

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