Preparation method for co-production of soybean oil and soybean cake meal

Abstract

The invention discloses a preparation method for co-production of soybean oil and soybean cakes. The preparation method comprises the following steps: winnowing, drying and crushing soybean raw materials to obtain soybean powder; water accounting for 3-10% of the mass of the soybean flour is added into the soybean flour in a conditioning machine, the water temperature is 60-70 DEG C, and the water absorption time is kept for 30-40 min; squeezing the conditioned soybean powder to obtain soybean crude oil and soybean cake meal; the method comprises the following steps: adjusting the weight ratio of water to oil in crude soybean oil to be (6-7): 100, heating the oil-water mixture to 65-69 DEG C, carrying out hydration degumming, freezing the crude soybean oil, crystallizing, growing the crystals for 10-12 hours, and carrying out precision filtration through compressed air by adopting a plate-and-frame filter after water and inorganic impurities and phospholipids in the oil form crystals, so as to obtain a finished soybean oil product. Through two times of squeezing, the loss of nutritional ingredients in the soybean oil and the soybean cake meal is reduced, and the product quality is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural product processing, and more specifically to a co-production preparation method of soybean oil and soybean cake meal. Background Art

[0002] As an important oil crop, soybean has extremely high processing and utilization value. Soybean oil is the main product extracted from soybeans by pressing or leaching methods. The pressing method extrudes the oil from the oilseeds through mechanical pressure. Although the oil yield is relatively low, it can better retain the flavor and nutritional components of the oil. The leaching method uses the solvent's dissolving effect on the oilseeds to extract the oil from the oilseeds, which has the advantages of high oil yield and high production efficiency. However, the subsequent treatment process is relatively complex, and there may be problems of solvent residue. After extracting soybean oil, the remaining soybean meal can be further processed to obtain soybean cake meal. Soybean cake meal has a high protein content and a reasonable amino acid composition, making it an excellent source of protein. However, during the processing, the protein in the cake meal coagulates and denatures due to high temperature, and it cannot be further processed into food, but can only be used as animal feed or fertilizer, which limits its application range. Summary of the Invention

[0003] In view of this, the present invention provides a co-production preparation method of soybean oil and soybean cake meal, which is simple to operate, has low energy consumption, reduces the loss of nutritional components in the oil and cake meal, and is more nutritious and health-care for the human body.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A co-production preparation method of soybean oil and soybean cake meal, comprising the following steps:

[0006] (1) Subjecting the soybean raw material to winnowing, drying, and pulverizing to obtain soybean powder;

[0007] (2) Adding water accounting for 3-10% by mass to the soybean powder in a conditioner, with the water temperature of 60-70 °C, and maintaining the water absorption time for 30-40 min;

[0008] (3) Pressing the conditioned soybean powder to obtain crude soybean oil and soybean cake meal;

[0009] (4) Adjusting the weight ratio of water to oil in the crude soybean oil to (6-7):100, heating the oil-water mixture to 65-69 °C, after hydration degumming, freezing the crude soybean oil, crystallizing and ripening for 10-12 h. After the water and inorganic impurities and phospholipids in the oil form crystals, using a plate and frame filter press to conduct precision filtration through compressed air to obtain the finished soybean oil.

[0010] Preferably, in step (1), the drying is to send the soybeans into a microwave oscillator and perform drying treatment under the condition that the microwave power is 700 - 730 W until the moisture content of the soybeans is 10 - 12%.

[0011] Preferably, in step (1), the crushing is to send the dried soybeans into a crusher and crush them to a fineness of 20 - 30 mesh.

[0012] Preferably, the pressing in step (3) includes a first moderate - temperature pressing and a second moderate - temperature pressing.

[0013] Preferably, the first moderate - temperature pressing includes: feeding the conditioned soybean meal into a double - screw oil press for moderate - temperature pressing, the oil - pressing temperature is 70 - 80 °C, the oil content of the cake is 14% - 18%, and the cake is broken at the outlet of the oil press.

[0014] Preferably, the second moderate - temperature pressing includes: feeding the first - stage pressed cake into another set of double - screw oil presses for moderate - temperature pressing, the oil - pressing temperature is 80 - 90 °C, and the residual oil content of the cake is not more than 6%.

[0015] Preferably, the time for hydration degumming in step (4) is 8 - 10 min.

[0016] Preferably, the temperature for freezing in step (4) is 3 - 4 °C.

[0017] As can be seen from the above - mentioned technical solutions, compared with the prior art, the present invention has the following technical effects:

[0018] (1) Through two - stage moderate - temperature pressing in the present invention, the loss of nutrients in soybean oil and soybean cake meal is reduced.

[0019] (2) The co - production preparation method of soybean oil and soybean cake meal provided by the present invention has a perfect process, is easy to operate, has moderate processing, and can ensure the quality of both soybean oil and soybean cake meal at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0021] Figure 1 The drawings are the flowcharts of the preparation method provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Example 1

[0024] This embodiment provides a co-production preparation method of soybean oil and soybean cake, including the following steps:

[0025] (1) The soybean raw materials are subjected to winnowing and impurity removal, and then the soybeans are sent into a microwave oscillator and dried under the condition of a microwave power of 730 W until the moisture content of the soybeans is 12%, and then the dried soybeans are sent into a pulverizer and pulverized to a fineness of 30 meshes to obtain soybean powder;

[0026] (2) Add 10% water by mass to the soybean powder in a conditioning machine, the water temperature is 70 °C, and the water absorption time is maintained for 40 min;

[0027] (3) Press the conditioned soybean powder to obtain crude soybean oil and soybean cake;

[0028] The pressing includes a first moderate-temperature pressing and a second moderate-temperature pressing.

[0029] The first moderate-temperature pressing includes: the conditioned soybean powder is input into a double-screw oil press for moderate-temperature pressing, the oil pressing temperature is 72.7 °C, the oil content of the cake is 14%, and the cake is broken at the outlet of the oil press.

[0030] The second moderate-temperature pressing includes: the first pressing cake is input into another group of double-screw oil presses for moderate-temperature pressing, the oil pressing temperature is 82.1 °C, the residual oil content of the cake is 5.21%, the soluble starch content in the soybean cake is 73.8%, and the nitrogen solubility index is 43.2%;

[0031] (4) Adjust the weight ratio of water to oil in the crude soybean oil to 7:100, heat the oil-water mixture to 69 °C, carry out hydration degumming for 10 min, freeze the crude soybean oil at 4 °C, crystallize and ripen for 12 h. After the water and inorganic impurities and phospholipids in the oil form crystals, use a plate-and-frame filter press to carry out precision filtration through compressed air to obtain the finished soybean oil.

[0032] Example 2

[0033] This embodiment provides a co-production preparation method of soybean oil and soybean cake, including the following steps:

[0034] (1) The soybean raw materials are separated from impurities by air separation, and then the soybeans are fed into a microwave oscillator and dried under the condition of a microwave power of 700 W until the moisture content of the soybeans reaches 10%. Then the dried soybeans are fed into a pulverizer and pulverized to a fineness of 20 mesh to obtain soybean powder;

[0035] (2) 3% water by mass is added to the soybean powder in a conditioning machine, the water temperature is 60 °C, and the water absorption time is maintained for 30 min;

[0036] (3) The conditioned soybean powder is pressed to obtain crude soybean oil and soybean cake;

[0037] Pressing includes primary moderate-temperature pressing and secondary moderate-temperature pressing.

[0038] The primary moderate-temperature pressing includes: the conditioned soybean powder is fed into a double-screw oil press for moderate-temperature pressing, the oil pressing temperature is 73.2 °C, the oil content of the cake is 18%, and the cake is broken at the outlet of the oil press.

[0039] The secondary moderate-temperature pressing includes: the primary pressed cake is fed into another set of double-screw oil presses for moderate-temperature pressing, the oil pressing temperature is 87.5 °C, the residual oil content of the cake is 5.51%, the soluble starch content in the soybean cake is 72.3%, and the nitrogen solubility index is 42.1%.

[0040] (4) The weight ratio of water to oil in the crude soybean oil is adjusted to 6:100, the oil-water mixture is heated to 65 °C, hydrated and degummed for 8 min, the crude soybean oil is frozen at 3 °C, crystallized and aged for 10 h. After the water and the inorganic impurities and phospholipids in the oil form crystals, a plate-and-frame filter press is used to conduct precision filtration through compressed air to obtain the finished soybean oil.

[0041] Example 3

[0042] This example provides a co-production preparation method of soybean oil and soybean cake, including the following steps:

[0043] (1) The soybean raw materials are separated from impurities by air separation, and then the soybeans are fed into a microwave oscillator and dried under the condition of a microwave power of 720 W until the moisture content of the soybeans reaches 11%. Then the dried soybeans are fed into a pulverizer and pulverized to a fineness of 25 mesh to obtain soybean powder;

[0044] (2) 5% water by mass is added to the soybean powder in a conditioning machine, the water temperature is 65 °C, and the water absorption time is maintained for 35 min;

[0045] (3) The conditioned soybean powder is pressed to obtain crude soybean oil and soybean cake;

[0046] Pressing includes primary moderate-temperature pressing and secondary moderate-temperature pressing.

[0047] The first moderate-temperature pressing includes: feeding the conditioned soybean meal into a double-screw oil press for moderate-temperature pressing. The oil pressing temperature is 71.5 °C, the oil content of the cake is 15%, and the cake is broken at the outlet of the oil press.

[0048] The second moderate-temperature pressing includes: feeding the first-stage pressed cake into another set of double-screw oil presses for moderate-temperature pressing. The oil pressing temperature is 85.2 °C, the residual oil content of the cake is 5.43%, the soluble starch content in the soybean cake is 73.1%, and the nitrogen solubility index is 42.8%.

[0049] (3) Adjust the weight ratio of water to soybean crude oil to 6:100, heat the oil-water mixture to 66 °C, carry out hydration degumming for 9 min, freeze the soybean crude oil at 3 °C, crystallize and ripen for 11 h. After the inorganic impurities and phospholipids in the water and oil form crystals, use a plate and frame filter press to conduct precision filtration through compressed air to obtain the finished soybean oil.

[0050] Comparative Example 1

[0051] This comparative example provides a co-production preparation method of soybean oil and soybean cake meal, which is the same as the preparation method in Example 3, except that it only undergoes the first moderate-temperature pressing. After pressing, the oil content in the soybean cake is 15.21, the soluble starch content is 62.5%, and the nitrogen solubility index is 44.7%.

[0052] Detect the moisture and volatile matter content, insoluble impurity content, and acid value of the obtained finished soybean oil according to GB / T 1535-2017. The results are shown in Table 1:

[0053] Table 1

[0054]

[0055] Through detection, it can be known that the soybean oil prepared by the co-production method of the present invention meets the national second-class soybean oil standard.

[0056] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description in the method part.

[0057] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for co-producing soybean oil and soybean meal, characterized in that: The following steps are involved: (1) selecting, drying and crushing soybean raw materials to obtain soybean powder; (2) adding 3-10% water by weight to the soybean flour in a conditioning machine, with the water temperature at 60-70° C., and maintaining the water absorption time for 30-40 minutes; (3) pressing the conditioned soybean flour to obtain crude soybean oil and soybean meal; (4) The weight ratio of water to oil in the crude soybean oil is adjusted to (6-7):100, the oil-water mixture is heated to 65-69° C., and after hydration and degumming, the crude soybean oil is frozen, crystallized, and grown for 10-12 hours. After water and inorganic impurities and phospholipids in the oil form crystals, the crude soybean oil is precisely filtered by compressed air using a plate and frame filter to obtain a finished soybean oil product.

2. The method for co-producing soybean oil and soybean meal according to claim 1, characterized in that: The drying in step (1) is to put the soybeans into a microwave oscillator and dry them under the condition of microwave power of 700-730W until the moisture content of the soybeans is 10-12%.

3. The method for co-producing soybean oil and soybean meal according to claim 1, characterized in that: The crushing in step (1) is to feed the dried soybeans into a crusher and crush them to a fineness of 20-30 meshes.

4. The method for co-producing soybean oil and soybean meal according to claim 1, characterized in that: The pressing in step (3) includes a primary temperature pressing and a secondary temperature pressing.

5. The method for co-producing soybean oil and soybean meal according to claim 4, characterized in that: The one-time proper temperature pressing comprises: the conditioned soybean powder is input into a double screw oil press for proper temperature pressing, the oil pressing temperature is 70-80°C, the oil content of the cake is 14%-18%, and the cake is broken at the outlet of the oil press.

6. The method for co-producing soybean oil and soybean meal according to claim 5, characterized in that: The secondary temperature-appropriate pressing includes: the first pressed cake is input into another set of double-screw oil presses for temperature-appropriate pressing, the pressing temperature is 80-90° C., and the residual oil content of the cake is not more than 6%.

7. The method for co-producing soybean oil and soybean meal according to claim 1, characterized in that: The time of hydration degumming in step (4) is 8-10min.

8. The method for co-producing soybean oil and soybean meal according to claim 1, characterized in that: The freezing temperature in step (4) is 3-4°C.

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