Rapeseed oil refining process

Abstract

The invention relates to the technical field of rapeseed oil refining, in particular to a rapeseed oil refining process which comprises the following steps: preparing rapeseed oil from rapeseeds by adopting a squeezing method, filtering the rapeseed oil, defoaming after filtering, and preparing a treating agent. The method comprises the following steps: mixing the rapeseed crude oil subjected to filtering and defoaming treatment with a treating agent, carrying out a stirring reaction, feeding the rapeseed crude oil subjected to the reaction into degumming equipment, carrying out degumming treatment, feeding the rapeseed crude oil subjected to the degumming treatment into an alkali refining tank, carrying out deacidification treatment, feeding the rapeseed crude oil subjected to the deacidification treatment into a deodorization tank, and carrying out treatment to obtain refined rapeseed oil, and cooling the refined rapeseed oil, and filling to finish the rapeseed oil refining process. According to the method, the treatment agent and the crude rapeseed oil are mixed, so that phospholipase loses catalytic activity, the effect of removing non-hydrated phospholipids in the rapeseed oil is good, and the oil product and food safety of the refined rapeseed oil are improved.

Description

Technical Field

[0001] The invention relates to the technical field of rapeseed oil refining, in particular to a rapeseed oil refining process. Background Art

[0002] Refined rapeseed oil refers to crude rapeseed oil that has been processed through a series of physical and chemical methods to remove impurities, free fatty acids, phospholipids, pigments, odor substances, etc., thereby obtaining edible oil with higher quality and better stability. Its purpose is to improve the quality of rapeseed oil so that it meets edible standards and market demand.

[0003] In the prior art, during the preparation of refined rapeseed oil, a hydration method is usually used to remove impurities in the rapeseed oil crude oil. However, rapeseed oil contains a small amount of non-hydratable phospholipids, which cannot be removed by the hydration method, resulting in a high phospholipid content in the refined rapeseed oil. Based on this, the present invention provides a rapeseed oil refining process. Summary of the invention

[0004] The purpose of the present invention is to provide a rapeseed oil refining process, which effectively reduces the phospholipid properties of refined rapeseed oil.

[0005] To achieve the above object, the present invention provides the following technical solution: a rapeseed oil refining process, characterized in that it comprises the following steps:

[0006] S1: rapeseed is pressed to produce rapeseed crude oil;

[0007] S2: filtering the rapeseed crude oil, and performing a defoaming treatment after the filtration is completed;

[0008] S3: preparing the treatment agent for standby use;

[0009] S4: mixing the rapeseed oil after filtering and defoaming treatment with the treatment agent, and stirring to react;

[0010] S5: sending the rapeseed crude oil that has completed the reaction into a degumming device for degumming treatment;

[0011] S6: sending the rapeseed crude oil after degumming into an alkali refining tank for deacidification treatment;

[0012] S7: sending the deacidified rapeseed oil to a deodorizing tank for treatment to obtain refined rapeseed oil;

[0013] S8: After the refined rapeseed oil is cooled, it is filled, thus completing the rapeseed oil refining process.

[0014] Furthermore, the treatment agent in step S3 is prepared by the following method: weigh rapeseed crude oil as needed and place it in a container, add citric acid, stir for 25 to 35 minutes, the mass of the citric acid is 4 to 6% of the mass of the rapeseed crude oil, add a preparation liquid after mixing, the mass of the preparation liquid is 4 to 6% of the mass of the rapeseed crude oil, heat to 75°C, keep warm for 2 to 4 hours, stir continuously during the insulation process, cool to room temperature after the insulation is completed, add an additive liquid, the mass of the additive liquid is 8 to 10% of the mass of the rapeseed crude oil, place in a water bath after mixing, add to 85°C, then keep warm for 2 to 4 hours, wait for cooling after the insulation is completed, filter, then place in a centrifuge for centrifugal treatment, filter again after the centrifugal treatment is completed, and obtain the treatment agent.

[0015] Furthermore, the formulation is prepared by the following method: alkyl sulfate and deionized water are stirred and mixed, the mass ratio of the alkyl sulfate to deionized water is 1: (2-3), placed in a mixing device, set to stir at a medium-low speed for 25-35 minutes, then add lecithin, continue stirring for 5-10 minutes, the mass of the lecithin is 15-25% of the mass of deionized water, and after stirring, heat to 75-85°C, keep warm for 40-50 minutes, and cool to room temperature after the insulation is completed to obtain the formulation.

[0016] Furthermore, the additive liquid is prepared by the following method: phosphoric acid and sodium carbonate are mixed and added into a container, and then alkali solution is added and stirred, wherein the mass ratio of phosphoric acid to sodium carbonate is 1:1.5, and the mass of the alkali solution is 2 to 4 times the mass of phosphoric acid. After mixing, the mixture is heated to 70 to 90° C. and kept warm for 25 to 35 minutes. Stirring is continued during the insulation process, and after the insulation is completed, the mixture is cooled to room temperature to obtain the additive liquid.

[0017] Furthermore, the centrifuge is set to rotate at a speed of 5000 to 6000 r / min and a time of 15 to 25 min during treatment.

[0018] Furthermore, the treatment method in step S4 is: weigh rapeseed crude oil as needed and send it into a water bath, preheat the water bath to 25-35° C. for use, then pour in a treatment agent, the mass of the treatment agent is 12-15% of the mass of the rapeseed crude oil, heat to 90-95° C. after mixing, the heating time is 30-40 minutes, and cool and filter after heating.

[0019] Furthermore, the degumming treatment in step S5 adopts a hydration degumming method, in which hot water with a temperature of 90-95° C. is added to the rapeseed crude oil, and the mass of the hot water is 6-8% of the mass of the rapeseed crude oil. After mixing and standing, centrifugal separation treatment is performed.

[0020] Furthermore, the deacidification method in step S6 is: adding alkali solution to the rapeseed crude oil, wherein the mass of the alkali solution is 1-2% of the mass of the rapeseed crude oil, and completing the deacidification through treatment in an alkali refining tank.

[0021] Furthermore, the deodorization method in step S7 is: the rapeseed crude oil is subjected to steam distillation in a deodorization tank to remove odor, and the deodorization time is 60 to 70 minutes.

[0022] Furthermore, the deodorizing tank is set at a temperature of 220-250° C. and a pressure of 300-350 Pa.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention uses a mixed treatment of a treatment agent and rapeseed crude oil, and adds alkyl sulfate and lecithin to the treatment agent, so that the activity of phospholipase in rapeseed oil is inhibited. When the tolerance of the enzyme molecule exceeds the limit, the structure of the phospholipase will change, thereby causing the phospholipase to lose its catalytic activity. The removal effect of non-hydratable phospholipids in rapeseed oil is better, and the oil quality and edible safety of refined rapeseed oil are improved.

[0025] 2. In the preparation process of refined rapeseed oil, phosphoric acid and sodium carbonate are added to the present invention. Phosphoric acid can react with non-hydratable phospholipids in the crude rapeseed oil to convert them into hydratable phospholipids, which are more easily removed in subsequent operations such as washing or centrifugation. By adding alkyl sulfate, the lipophilic alkyl chain will contact the oil phase on the surface of the wax particles, and the surface properties of the wax particles will be changed by adsorption, thereby reducing the interaction between the wax particles and between the wax particles and the oil phase, so that the wax particles are dispersed in water to form an emulsion, which can be separated from the oil by centrifugation, thereby effectively reducing the wax content of the refined rapeseed oil. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below.

[0028] This embodiment provides a rapeseed oil refining process, which is characterized by comprising the following steps:

[0029] S1: rapeseed is pressed to produce rapeseed crude oil;

[0030] S2: filtering the rapeseed crude oil, and performing a defoaming treatment after the filtration is completed;

[0031] S3: preparing the treatment agent for standby use;

[0032] S4: mixing the rapeseed oil after filtering and defoaming treatment with the treatment agent, and stirring to react;

[0033] S5: sending the rapeseed crude oil that has completed the reaction into a degumming device for degumming treatment;

[0034] S6: sending the rapeseed crude oil after degumming into an alkali refining tank for deacidification treatment;

[0035] S7: sending the deacidified rapeseed oil to a deodorizing tank for treatment to obtain refined rapeseed oil;

[0036] S8: After the refined rapeseed oil is cooled, it is filled, thus completing the rapeseed oil refining process.

[0037] The treatment agent in step S3 is prepared by the following method: weigh rapeseed crude oil as needed and place it in a container, add citric acid, stir for 25 to 35 minutes, the mass of citric acid is 4 to 6% of the mass of rapeseed crude oil, add a preparation liquid after mixing, the mass of the preparation liquid is 4 to 6% of the mass of rapeseed crude oil, heat to 75°C, keep warm for 2 to 4 hours, stir continuously during the insulation process, cool to room temperature after the insulation is completed, add an additive liquid, the mass of the additive liquid is 8 to 10% of the mass of rapeseed crude oil, place in a water bath after mixing, add to 85°C, then keep warm for 2 to 4 hours, wait for cooling after the insulation is completed, filter, then place in a centrifuge for centrifugal treatment, filter again after the centrifugal treatment is completed, and obtain the treatment agent.

[0038] The preparation liquid is prepared by the following method: alkyl sulfate and deionized water are stirred and mixed, the mass ratio of alkyl sulfate to deionized water is 1: (2-3), placed in a mixing device, set to stir at a medium-low speed for 25-35 minutes, then add lecithin, continue stirring for 5-10 minutes, the mass of lecithin is 15-25% of the mass of deionized water, heat to 75-85°C after stirring, keep warm for 40-50 minutes, and cool to room temperature after the insulation is completed to obtain the preparation liquid.

[0039] The additive liquid is prepared by the following method: phosphoric acid and sodium carbonate are mixed and added into a container, and then alkali solution is added and stirred, the mass ratio of phosphoric acid to sodium carbonate is 1:1.5, the mass of alkali solution is 2 to 4 times the mass of phosphoric acid, after mixing, it is heated to 70 to 90°C, and kept warm for 25 to 35 minutes, and stirring is continuously performed during the insulation process. After the insulation is completed, it is cooled to room temperature to obtain the additive liquid.

[0040] During centrifuge processing, the speed is set to 5000-6000 r / min and the time is 15-25 min.

[0041] The treatment method in step S4 is: weigh rapeseed crude oil as needed and send it into a water bath, preheat the water bath to 25-35° C., then pour in a treatment agent, the mass of the treatment agent is 12-15% of the mass of the rapeseed crude oil, heat to 90-95° C. after mixing, the heating time is 30-40 minutes, and cool and filter after heating.

[0042] The degumming treatment in step S5 adopts a hydration degumming method, in which hot water with a temperature of 90-95° C. is added to the rapeseed crude oil, and the mass of the hot water is 6-8% of the mass of the rapeseed crude oil. After mixing and standing, centrifugal separation treatment is performed.

[0043] The deacidification method in step S6 is: adding alkali solution to the rapeseed crude oil, the mass of the alkali solution is 1-2% of the mass of the rapeseed crude oil, and completing the deacidification through treatment in an alkali refining tank.

[0044] The method of deodorization in step S7 is as follows: the rapeseed crude oil is subjected to steam distillation in a deodorization tank to remove odor, and the deodorization time is 60 to 70 minutes.

[0045] The deodorizing tank is set at a temperature of 220-250°C and a pressure of 300-350Pa.

[0046] In this embodiment, the activity of phospholipase in rapeseed oil is inhibited by adding alkyl sulfate and lecithin to the treating agent through mixed treatment with the treating agent. When the tolerance of the enzyme molecule exceeds the limit, the structure of the phospholipase will change, thereby causing the phospholipase to lose its catalytic activity. The removal effect of non-hydratable phospholipids in rapeseed oil is better, and the oil quality and edible safety of refined rapeseed oil are improved. During the preparation process of adding phosphoric acid and sodium carbonate to refined rapeseed oil, phosphoric acid can react with non-hydratable phospholipids in rapeseed oil crude oil to convert them into hydrated phospholipids, which are more easily removed in subsequent operations such as washing or centrifugation. By adding alkyl sulfate, the lipophilic alkyl chain will contact the oil phase on the surface of the wax particles, and the surface properties of the wax particles will be changed by adsorption, and the interaction between the wax particles and the oil phase will be reduced, so that the wax particles are dispersed in water to form an emulsion, which can be separated from the oil by centrifugation, effectively reducing the wax content of the refined rapeseed oil.

[0047] Based on the above embodiments, the inventors also conducted the following experiments:

[0048] It should be noted that the raw materials used in the following experiments are all commercially available raw materials.

[0049] Experiment 1:

[0050] S1: rapeseed is pressed to produce rapeseed crude oil;

[0051] S2: filtering the rapeseed crude oil, and performing a defoaming treatment after the filtration is completed;

[0052] S3: preparing the treatment agent for standby use;

[0053] The treatment agent is prepared by the following method: weigh rapeseed crude oil as needed and place it in a container, add citric acid, stir for 25 minutes, the mass of citric acid is 4% of the mass of rapeseed crude oil, add a preparation liquid after mixing, the mass of the preparation liquid is 4% of the mass of rapeseed crude oil, heat to 75°C, keep warm for 2 hours, stir continuously during the insulation process, cool to room temperature after the insulation is completed, add an additive liquid, the mass of the additive liquid is 8% of the mass of rapeseed crude oil, place in a water bath after mixing, add to 85°C, then keep warm for 2 hours, wait for cooling after the insulation is completed, filter, then place in a centrifuge for centrifugal treatment, filter again after the centrifugal treatment is completed, and obtain the treatment agent;

[0054] The preparation liquid is prepared by the following method: alkyl sulfate and deionized water are stirred and mixed, the mass ratio of alkyl sulfate to deionized water is 1:2, placed in a mixing device, set to stir at a medium-low speed for 25 minutes, then add lecithin, continue stirring for 5 minutes, the mass of lecithin is 15% of the mass of deionized water, heat to 75°C after stirring, keep warm for 40 minutes, and cool to room temperature after the insulation is completed to obtain the preparation liquid;

[0055] The additive liquid is prepared by the following method: phosphoric acid and sodium carbonate are mixed and added into a container, and then alkali solution is added and stirred, the mass ratio of phosphoric acid to sodium carbonate is 1:1.5, the mass of alkali solution is twice the mass of phosphoric acid, and after mixing, it is heated to 70°C and kept warm for 25 minutes, and stirred continuously during the insulation process. After the insulation is completed, it is cooled to room temperature to obtain the additive liquid, and the speed of the centrifuge is set to 5000r / min, and the time is 15min;

[0056] S4: mixing the rapeseed oil after filtering and defoaming treatment with the treatment agent, and stirring to react;

[0057] The treatment method in step S4 is: weigh rapeseed crude oil as needed and put it into a water bath, preheat the water bath to 25° C. for use, then pour in a treatment agent, the mass of the treatment agent is 12% of the mass of the rapeseed crude oil, heat to 90° C. after mixing, the heating time is 30 minutes, and after heating, cool and filter;

[0058] S5: sending the rapeseed crude oil that has completed the reaction into a degumming device for degumming treatment;

[0059] The degumming treatment in step S5 adopts a hydration degumming method, in which hot water at a temperature of 90° C. is added to the rapeseed crude oil, and the mass of the hot water is 6% of the mass of the rapeseed crude oil. After mixing and standing, centrifugal separation is performed;

[0060] S6: sending the rapeseed crude oil after degumming into an alkali refining tank for deacidification treatment;

[0061] The deacidification method in step S6 is: adding alkali liquid to the rapeseed crude oil, the mass of the alkali liquid is 1% of the mass of the rapeseed crude oil, and completing the deacidification through treatment in an alkali refining tank;

[0062] S7: sending the deacidified rapeseed oil to a deodorizing tank for treatment to obtain refined rapeseed oil;

[0063] The deodorization method in step S7 is: the rapeseed crude oil is deodorized by steam distillation in a deodorization tank, the deodorization time is 60 minutes, the deodorization tank is set at a temperature of 220° C. and a pressure of 300 Pa;

[0064] S8: After the refined rapeseed oil is cooled, it is filled.

[0065] Experiment 2:

[0066] S1: rapeseed is pressed to produce rapeseed crude oil;

[0067] S2: filtering the rapeseed crude oil, and performing a defoaming treatment after the filtration is completed;

[0068] S3: preparing the treatment agent for standby use;

[0069] The treatment agent is prepared by the following method: weigh rapeseed crude oil as needed and place it in a container, add citric acid, stir for 30 minutes, the mass of citric acid is 5% of the mass of rapeseed crude oil, add a preparation liquid after mixing, the mass of the preparation liquid is 5% of the mass of rapeseed crude oil, heat to 75°C, keep warm for 3 hours, stir continuously during the insulation process, cool to room temperature after the insulation is completed, add an additive liquid, the mass of the additive liquid is 9% of the mass of rapeseed crude oil, place in a water bath after mixing, add to 85°C, then keep warm for 3 hours, wait for cooling after the insulation is completed, filter, then place in a centrifuge for centrifugal treatment, filter again after the centrifugal treatment is completed, and obtain the treatment agent;

[0070] The preparation liquid is prepared by the following method: alkyl sulfate and deionized water are stirred and mixed, the mass ratio of alkyl sulfate to deionized water is 1:2.5, placed in a mixing device, set to stir at a medium-low speed for 30 minutes, then add lecithin, continue stirring for 7 minutes, the mass of lecithin is 20% of the mass of deionized water, heat to 80°C after stirring, keep warm for 45 minutes, and cool to room temperature after the insulation is completed to obtain the preparation liquid;

[0071] The additive liquid is prepared by the following method: phosphoric acid and sodium carbonate are mixed and added into a container, and then alkali solution is added and stirred, the mass ratio of phosphoric acid to sodium carbonate is 1:1.5, the mass of alkali solution is 3 times the mass of phosphoric acid, and after mixing, it is heated to 80°C and kept warm for 30 minutes, and stirred continuously during the insulation process. After the insulation is completed, it is cooled to room temperature to obtain the additive liquid, and the speed of the centrifuge is set to 5500r / min, and the time is 20min;

[0072] S4: mixing the rapeseed oil after filtering and defoaming treatment with the treatment agent, and stirring to react;

[0073] The treatment method in step S4 is: weigh rapeseed crude oil as needed and put it into a water bath, preheat the water bath to 30° C. for use, then pour in a treatment agent, the mass of the treatment agent is 13% of the mass of the rapeseed crude oil, heat to 92° C. after mixing, the heating time is 35 minutes, and cool and filter after heating;

[0074] S5: sending the rapeseed crude oil that has completed the reaction into a degumming device for degumming treatment;

[0075] The degumming treatment in step S5 adopts a hydration degumming method, in which hot water with a temperature of 92° C. is added to the rapeseed crude oil, and the mass of the hot water is 7% of the mass of the rapeseed crude oil. After mixing and standing, centrifugal separation is performed;

[0076] S6: sending the rapeseed crude oil after degumming into an alkali refining tank for deacidification treatment;

[0077] The deacidification method in step S6 is: adding alkali liquid to the rapeseed crude oil, the mass of the alkali liquid is 1.5% of the mass of the rapeseed crude oil, and completing the deacidification through alkali refining tank treatment;

[0078] S7: sending the deacidified rapeseed oil to a deodorizing tank for treatment to obtain refined rapeseed oil;

[0079] The deodorization method in step S7 is as follows: the rapeseed crude oil is deodorized by steam distillation in a deodorization tank, the deodorization time is 65 minutes, the deodorization tank is set at a temperature of 230° C., and the pressure is 320 Pa;

[0080] S8: After the refined rapeseed oil is cooled, it is filled.

[0081] Experiment 3:

[0082] S1: rapeseed is pressed to produce rapeseed crude oil;

[0083] S2: filtering the rapeseed crude oil, and performing a defoaming treatment after the filtration is completed;

[0084] S3: preparing the treatment agent for standby use;

[0085] The treatment agent is prepared by the following method: weigh rapeseed crude oil as needed and place it in a container, add citric acid, stir for 35 minutes, the mass of citric acid is 6% of the mass of rapeseed crude oil, add a preparation liquid after mixing, the mass of the preparation liquid is 6% of the mass of rapeseed crude oil, heat to 75°C, keep warm for 4 hours, stir continuously during the insulation process, cool to room temperature after the insulation is completed, add an additive liquid, the mass of the additive liquid is 10% of the mass of rapeseed crude oil, place in a water bath after mixing, add to 85°C, then keep warm for 4 hours, wait for cooling after the insulation is completed, filter, then place in a centrifuge for centrifugal treatment, filter again after the centrifugal treatment is completed, and obtain the treatment agent;

[0086] The preparation liquid is prepared by the following method: alkyl sulfate and deionized water are stirred and mixed, the mass ratio of alkyl sulfate to deionized water is 1:3, placed in a mixing device, set to stir at a medium-low speed for 35 minutes, then add lecithin, continue stirring for 10 minutes, the mass of lecithin is 25% of the mass of deionized water, heat to 85°C after stirring, keep warm for 50 minutes, and cool to room temperature after the insulation is completed to obtain the preparation liquid;

[0087] The additive liquid is prepared by the following method: phosphoric acid and sodium carbonate are mixed and added into a container, and then alkali solution is added and stirred, the mass ratio of phosphoric acid to sodium carbonate is 1:1.5, the mass of alkali solution is 4 times the mass of phosphoric acid, and after mixing, it is heated to 90°C and kept warm for 35 minutes, and the stirring is continuously performed during the insulation process. After the insulation is completed, it is cooled to room temperature to obtain the additive liquid, and the speed of the centrifuge is set to 6000r / min, and the time is 25min;

[0088] S4: mixing the rapeseed oil after filtering and defoaming treatment with the treatment agent, and stirring to react;

[0089] The treatment method in step S4 is: weigh rapeseed crude oil as needed and put it into a water bath, preheat the water bath to 35° C., then pour in a treatment agent, the mass of the treatment agent is 15% of the mass of the rapeseed crude oil, heat to 95° C. after mixing, the heating time is 40 minutes, and cool and filter after heating;

[0090] S5: sending the rapeseed crude oil that has completed the reaction into a degumming device for degumming treatment;

[0091] The degumming treatment in step S5 adopts a hydration degumming method, in which hot water at a temperature of 95° C. is added to the rapeseed crude oil, and the mass of the hot water is 8% of the mass of the rapeseed crude oil. After mixing and standing, centrifugal separation is performed;

[0092] S6: sending the rapeseed crude oil after degumming into an alkali refining tank for deacidification treatment;

[0093] The deacidification method in step S6 is: adding alkali liquid to the rapeseed crude oil, the mass of the alkali liquid is 2% of the mass of the rapeseed crude oil, and completing the deacidification through alkali refining tank treatment;

[0094] S7: sending the deacidified rapeseed oil to a deodorizing tank for treatment to obtain refined rapeseed oil;

[0095] The deodorization method in step S7 is: the rapeseed crude oil is deodorized by steam distillation in a deodorization tank, the deodorization time is 70 minutes, the deodorization tank is set at a temperature of 250° C. and a pressure of 350 Pa;

[0096] S8: After the refined rapeseed oil is cooled, it is filled.

[0097] Comparative Example 1: The difference between this comparative example and Experiment 1 is that this comparative example does not contain a treating agent.

[0098] Comparative Example 2: The difference between this comparative example and Experiment 1 is that no mixing liquid is added when preparing the treatment agent in this comparative example.

[0099] Comparative Example 3: The difference between this comparative example and Experiment 1 is that no lecithin is added when preparing the formulation in this comparative example.

[0100] Comparative Example 4: The difference between this comparative example and Experiment 1 is that no citric acid was added when preparing the treatment agent in this comparative example.

[0101] Performance test: The refined rapeseed oil treated in Experiment 1, Experiment 2, Experiment 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 was subjected to performance test, and the test data obtained are recorded in the following table:

[0102]

[0103] By comparing and analyzing the relevant data in the table, it can be seen that the refined rapeseed oil prepared by the present invention not only has a lower phospholipid content, but also has a lower wax content. This shows that the rapeseed oil refining process provided by the present invention has a broader market prospect and is more suitable for promotion.

[0104] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0105] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A rapeseed oil refining process, characterized in that: The following steps are involved: S1: rapeseed is pressed to produce rapeseed crude oil; S2: filtering the rapeseed crude oil, and performing a defoaming treatment after the filtration is completed; S3: preparing the treatment agent for standby use; S4: mixing the rapeseed oil after filtering and defoaming treatment with the treatment agent, and stirring to react; S5: sending the rapeseed crude oil that has completed the reaction into a degumming device for degumming treatment; S6: sending the rapeseed crude oil after degumming into an alkali refining tank for deacidification treatment; S7: sending the deacidified rapeseed oil to a deodorizing tank for treatment to obtain refined rapeseed oil; S8: After the refined rapeseed oil is cooled, it is filled, thus completing the rapeseed oil refining process.

2. The rapeseed oil refining process according to claim 1, characterized in that: The treatment agent in step S3 is prepared by the following method: weigh rapeseed crude oil as needed and place it in a container, add citric acid, stir for 25 to 35 minutes, the mass of the citric acid is 4 to 6% of the mass of the rapeseed crude oil, add a preparation liquid after mixing, the mass of the preparation liquid is 4 to 6% of the mass of the rapeseed crude oil, heat to 75°C, keep warm for 2 to 4 hours, stir continuously during the insulation process, cool to room temperature after the insulation is completed, add an additive liquid, the mass of the additive liquid is 8 to 10% of the mass of the rapeseed crude oil, place in a water bath after mixing, add to 85°C, then keep warm for 2 to 4 hours, wait for cooling after the insulation is completed, filter, then place in a centrifuge for centrifugal treatment, filter again after the centrifugal treatment is completed, and obtain the treatment agent.

3. The rapeseed oil refining process according to claim 2, characterized in that: The formulation is prepared by the following method: alkyl sulfate and deionized water are stirred and mixed, wherein the mass ratio of the alkyl sulfate to the deionized water is 1:(2-3), placed in a mixing device, set to stir at a medium-low speed for 25-35 minutes, then add lecithin, continue stirring for 5-10 minutes, wherein the mass of the lecithin is 15-25% of the mass of the deionized water, heat to 75-85° C. after stirring, keep warm for 40-50 minutes, and cool to room temperature after the insulation is completed to obtain the formulation.

4. The rapeseed oil refining process according to claim 2, characterized in that: The additive liquid is prepared by the following method: phosphoric acid and sodium carbonate are mixed and added into a container, and then alkali solution is added and stirred, wherein the mass ratio of phosphoric acid to sodium carbonate is 1:1.5, and the mass of the alkali solution is 2 to 4 times the mass of phosphoric acid; after mixing, the mixture is heated to 70 to 90° C., and the mixture is kept warm for 25 to 35 minutes, and the mixture is stirred continuously during the warm-keeping process; after the warm-keeping is completed, the mixture is cooled to room temperature to obtain the additive liquid.

5. The rapeseed oil refining process according to claim 2, characterized in that: The centrifuge is set to rotate at a speed of 5000-6000 r / min for 15-25 min.

6. The rapeseed oil refining process according to claim 1, characterized in that: The treatment method in step S4 is: weigh rapeseed crude oil as needed and send it into a water bath, preheat the water bath to 25-35° C. for use, then pour in a treatment agent, the mass of the treatment agent is 12-15% of the mass of the rapeseed crude oil, heat to 90-95° C. after mixing, the heating time is 30-40 minutes, and cool and filter after heating.

7. The rapeseed oil refining process according to claim 1, characterized in that: The degumming treatment in step S5 adopts a hydration degumming method, in which hot water with a temperature of 90-95° C. is added to the rapeseed crude oil, and the mass of the hot water is 6-8% of the mass of the rapeseed crude oil. After mixing and standing, centrifugal separation treatment is performed.

8. The rapeseed oil refining process according to claim 1, characterized in that: The deacidification method in step S6 is: adding alkali solution to the rapeseed crude oil, wherein the mass of the alkali solution is 1-2% of the mass of the rapeseed crude oil, and completing the deacidification through treatment in an alkali refining tank.

9. The rapeseed oil refining process according to claim 1, characterized in that: The deodorization method in step S7 is as follows: the rapeseed crude oil is subjected to steam distillation in a deodorization tank to remove odor, and the deodorization time is 60 to 70 minutes.

10. The rapeseed oil refining process according to claim 1, characterized in that: The deodorizing tank is set at a temperature of 220-250° C. and a pressure of 300-350 Pa.

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