Deodorization tertiary refining process for soybean oil

Abstract

The application provides a de-taste three-stage soybean oil refining process, which comprises the following steps: adding phosphoric acid into crude oil, adding 0.05-0.2% edible phosphoric acid, mixing in a mixer, and then placing into an acid reaction tank for residence and coagulation; the alkali concentration is determined according to different acid values of the crude oil, the oil and alkali are mixed at 80-85 DEG C, the mixed oil is put into a multi-effect mixer, and then into an alkali reaction tank, the alkali refining reaction time is 6-15 min, and the first centrifuge is used for centrifugal separation; the acid value (KOH) of the separated oil is 0.1-0.3 mg / g; water washing: adding a 25% citric acid aqueous solution, adding citric acid to chelate metal ions, adding 3-5% soft water into the oil, the water temperature is higher than the oil temperature by 5 DEG C, and then the oil is put into a mixer and a residence tank, and then into a second separator for separation; deodorization: the deodorization vacuum is less than or equal to 5 mbar, the deodorization temperature is 225-235 DEG C, the time is 60-80 min, stripping steam is introduced, and the trap temperature is 45-50 DEG C. The refining oil processing process chain is optimized, a de-taste three-stage soybean oil production process meeting the customer demand and improving the product single-ton profit is provided, the process is simple and effective, and the finished oil quality fully meets the market requirements.

Description

TECHNICAL FIELD

[0001] The application belongs to the food industry, and particularly relates to a deodorized three-grade bean oil refining process. BACKGROUND

[0002] The sesame oil blend, pepper oil and rattan pepper oil are sold to all parts of the country. The base oil requires dark color and no odor. At present, the main raw material is first-grade bean oil, and the addition proportion of the bean oil is 50%-90%.

[0003] The refined first-grade bean oil is high in price, light in color and odorless; the three-grade bean oil is low in price, dark in color, but heavy in bean odor, which does not meet the product characteristic requirements of customers, and affects the quality of the final product of customers and market competitiveness.

[0004] In view of the existing market situation, the seasoning oil factory is visited, and research is carried out from the aspects of customer demand, product characteristics, profit point and market potential. Through discussion, a first-grade bean oil substitute oil product, deodorized three-grade bean oil, which meets the customer demand and improves the single-ton profit of the product, is urgently developed. SUMMARY

[0005] The application provides a deodorized three-grade bean oil refining process, and the steps are as follows:

[0006] Step (1) 0.05%-0.2% edible grade phosphoric acid is added to the crude oil, and after mixing in a mixer, the mixture is placed in an acid reaction tank for residence and coagulation;

[0007] Step (2) the alkali concentration is determined according to different acid values of the crude oil, and the oil and alkali are mixed at 80-85℃, and then the mixed oil is put into a multi-effect mixer, and then into an alkali reaction tank, and the alkali refining reaction time is 6-15 min,

[0008] Step (3) a first centrifuge is used for centrifugal separation; the acid value (KOH) of the separated oil is 0.1-0.3 mg / g;

[0009] Step (4) water washing: 25% citric acid aqueous solution is configured and added, citric acid chelates metal ions, 3%-5% soft water is added to the oil, the water temperature is higher than the oil temperature by 5℃, and then the mixture is put into a mixer and a residence tank, and then separated by a second separator after washing;

[0010] Step (5) deodorization: the deodorization vacuum is ≤5 mbar, the deodorization temperature is 225-235℃, the time is 60-80 min, stripping steam is introduced, and the trap temperature is 45-50℃.

[0011] Preferably, in step (1), the oil temperature is controlled to be 70-80℃, and the coagulation time is 40-60 min.

[0012] Preferably, in step (4), after separation, the oil contains 0.3%-0.5% water, and the equipment vacuum is less than or equal to 100 mbar.

[0013] Preferably, after step (4), after separation, the oil is subjected to drying treatment, and the dried oil contains less than or equal to 0.1% water.

[0014] Preferably, the neutralized and dried oil is controlled to have an acid value (KOH) of 0.15-0.3 mg / g, a residual soap content of 41.0 mg / kg, a phosphorus content of 9.50 mg / kg, and a water content of 0.1%

[0015] Preferably, in step (5), the deodorization process uses a combination of a packing tower and a plate tower.

[0016] Preferably, before the deodorization process in step (5), gas separation and heating are performed: under a gas pressure of about 3 mbar, steam is injected via a pump, the oil is fully contacted with the steam under the stirring of the steam, and the steam is uniformly dispersed in the oil; finally, the oil is cooled under vacuum conditions through heat exchange.

[0017] Preferably, before the deodorization process, decolorization is performed, and the decolorization system is kept at a vacuum of less than or equal to 100 mbar.

[0018] The beneficial effects achieved by the present application are: the refining oil processing chain is optimized, a three-stage deodorized soybean oil production process is provided, which meets the needs of customers and improves the profit per ton of product, the process is simple and effective, and the quality of the finished oil fully meets the market requirements. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The process flowchart of the present application is shown.

[0020] The present application will be described below through specific embodiments. Unless otherwise specified, the technical means used in the present application are methods known to those skilled in the art. In addition, the embodiments should be understood as illustrative, rather than limiting the scope of the present application, and the essence and scope of the present application are only limited by the claims. For those skilled in the art, various changes or modifications to the material components and amounts in these embodiments without departing from the essence and scope of the present application also fall within the protection scope of the present application.

[0021] In combination Figure 1 A three-stage deodorized soybean oil refining process provided by the present application is described, and the steps are as follows:

[0022] Step (1), 0.05%-0.2% edible-grade phosphoric acid is added to the crude oil, which is mixed in a mixer and then placed in an acid reaction tank for residence and coagulation.

[0023] The principle or effect of adding phosphoric acid is to convert the non-hydrated phospholipid in the oil into hydrated phospholipid, so as to facilitate the subsequent removal of phospholipid.

[0024] In step (1), the oil temperature is controlled at 70-80°C, and the condensation time is 40-60 min.

[0025] Before adding phosphoric acid, the crude oil can be coarsely filtered by a filter.

[0026] In step (2), the alkali concentration is determined according to the different acid values of the crude oil, and the oil and alkali are mixed at 80-85°C, and then the mixed oil is fed into the alkali reaction tank through the multi-effect mixer, and the alkali refining reaction time is 6-15 min.

[0027] The principle or effect of adding alkali is to neutralize the acid and base, remove the free fatty acid in the oil, and adjust the acid value of the oil.

[0028] In step (3), a first centrifuge is used for centrifugal separation; the acid value of the separated oil (KOH) is 0.1-0.3 mg / g; at the same time, the soap kernels are removed through separation.

[0029] In step (4), water washing: a 25% citric acid aqueous solution is prepared and added, the metal ions are chelated by citric acid, 3%-5% soft water is added to the oil, the water temperature is higher than the oil temperature by 5°C, and then the mixture is fed into the mixer and the retention tank, and then separated by a second separator after washing;

[0030] The effect of adding citric acid water is: 1. removing excess alkali in the alkali refining process; 2. breaking emulsion to prevent oil and water from being emulsified. The purpose of water washing is: 1. removing residual soap; 2. removing excess alkali.

[0031] After separation, the water content in the oil is controlled at 0.3%-0.5%, and the equipment vacuum is ≤100 mbar.

[0032] Preferably, after step (4), the oil is dried after secondary separation, and the water content in the dried oil is less than or equal to 0.1%. The drying process uses a dryer and a drying tower for drying.

[0033] In this embodiment, the neutralized and dried oil has an acid value (KOH) of 0.15-0.3 mg / g, a residual soap content of 41.0 mg / kg, a phosphorus content of 9.50 mg / kg, and a water content of 0.1%.

[0034] In step (5), deodorization: the deodorization vacuum is ≤5 mbar, the deodorization temperature is 225-235°C, the time is 60-80 min, stripping steam is introduced, and the trap temperature is 45-50°C.

[0035] Preferably, the deodorization process in step (5) uses a combination of a packed tower and a plate tower.

[0036] Deodorization is a process that removes odoriferous substances from oil by taking advantage of the large difference in volatility (vapor pressure) between the odoriferous substances and the triglycerides. In essence, deodorization is a mass transfer process that requires removal of all odoriferous substances from the oil at a temperature below the decomposition temperature of the oil.

[0037] Preferably, before the deodorization process in step (5), the oil is first subjected to a degassing and heating process: at a pressure of about 3 mbar, the oil is subjected to steam injection, and the oil is fully contacted with the steam under the agitation of the steam, and the steam is uniformly dispersed in the oil; finally, the oil is cooled under vacuum conditions by heat exchange.

[0038] Preferably, before the deodorization process, the oil is subjected to a bleaching process, and the bleaching system is maintained at a vacuum of ≤ 100 mbar.

[0039] The bleaching process can be omitted if the customer does not have high requirements for color.

[0040] The finished oil after deodorization is filtered through a precision filter, and the finished oil is then stored in a tank.

[0041] After the crude oil is processed by the process, the effective experimental data obtained are as follows:

[0042]

[0043] As can be seen from the above table, the cost oil obtained after the above process steps (without bleaching process) has no odor, good taste, and is suitable for market.

Claims

1. A deodorized three-stage soybean oil refining process, comprising the following steps: Step (1) Add phosphoric acid: Add phosphoric acid to crude oil, add 0.05% to 0.2% food-grade phosphoric acid, mix in a mixer, and then put it into an acid reaction tank for retention and coagulation. Control the oil temperature at 70 to 80°C and the coagulation time at 40 to 60 minutes. Step (2) Alkali refining: The concentration of alkali added is determined according to the crude oil with different acid values. The oil and alkali are mixed at 80-85℃ and enter the multi-effect mixer. The mixed oil is then fed into the alkali reaction tank. The alkali refining reaction time is 6-15 minutes. Step (3) Centrifuge using a first centrifuge; the acid value (KOH) of the separated oil is 0.1–0.3 mg / g; Step (4) Water washing: The water washing vacuum is ≤100mbar. A 25% citric acid aqueous solution is prepared and added. Citric acid is added to chelate metal ions. 3% to 5% soft water is added to the oil. The water temperature is 5°C higher than the oil temperature. The oil is then fed into a mixer and a retention tank. After washing, the oil is separated in a second separator. The water content in the separated oil is 0.3% to 0.5%. The oil is then dried until the water content is ≤0.1%. Step (5) Gas separation heating at 3 mbar: Steam is injected through a pump to ensure that the oil and steam are in full contact and the steam is evenly dispersed in the oil; Step (6) Deodorization: Deodorization vacuum ≤ 5mbar, deodorization temperature 225~235℃, time 60-80min, pass stripping steam, and the collector collection temperature 45-50℃.

2. The deodorized three-stage soybean oil refining process as described in claim 1, characterized in that, In step (4), the neutralized and dried oleic acid value (KOH) is controlled at 0.15-0.3 mg / g, the residual soap content is 41.0 mg / kg, the phosphorus content is 9.50 mg / kg, and the water content is 0.1%.

3. The deodorized three-stage soybean oil refining process as described in claim 1, characterized in that, Step (6) The deodorization process uses a combination of packed tower and plate tower.

4. The deodorized three-stage soybean oil refining process as described in claim 1, characterized in that, It also includes step (7) cooling: the oil is cooled by heat exchange under vacuum conditions.

5. The deodorized three-stage soybean oil refining process as described in claim 1, characterized in that, Decolorization is performed before the deodorization process, and the vacuum of the decolorization system is maintained at ≤100mbar.

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