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CN-120865993-B - Rice bran oil deodorization technology for controlling generation of glycidyl ester

CN120865993BCN 120865993 BCN120865993 BCN 120865993BCN-120865993-B

Abstract

The invention provides a rice bran oil deodorization process for controlling generation of glycidyl ester, which can obviously inhibit generation of GEs in the rice bran oil deodorization process by combining non-conventional steps such as compound chelation pretreatment before deodorization, gradient pressure transformation treatment in the deodorization process, low-temperature plasma post-treatment after deodorization and the like and combining synergistic optimization of parameters such as temperature, time, vacuum degree and the like, so that GEs content in the rice bran oil after deodorization is controlled below 0.5mg/kg, and meanwhile, flavor and oxidation stability of the rice bran oil are ensured. The method has simple process operation and strong controllability, and is suitable for industrial production and application.

Inventors

  • LI BO
  • SHI REN
  • LI HAO

Assignees

  • 江苏康之源粮油有限公司

Dates

Publication Date
20260512
Application Date
20250725

Claims (6)

  1. 1. A rice bran oil deodorization process for controlling the formation of glycidylesters, comprising the steps of: (1) The method comprises the steps of (1) carrying out composite chelation pretreatment, namely, sending decolorized rice bran oil into a pretreatment tank, adding a composite chelant, and carrying out pretreatment at a certain temperature and stirring speed, wherein the composite chelant is formed by compounding (1-3) citric acid, phytic acid and disodium ethylenediamine tetraacetate according to the mass ratio of (1-2) to (0.5-1), and the addition amount of the composite chelant is 0.03-0.08% of the mass of the rice bran oil; (2) The gradient pressure swing deodorization is carried out by sending the rice bran oil treated in the step (1) into a deodorization tower, carrying out gradient pressure swing deodorization treatment, controlling the temperature, time and vacuum degree change in the deodorization process, wherein the gradient pressure swing deodorization is specifically carried out by firstly controlling the vacuum degree in the deodorization tower to be 1-2mmHg, raising the temperature to 200-220 ℃ and keeping the temperature for 10-15min, then lowering the vacuum degree to 0.5-0.8mmHg, raising the temperature to 220-240 ℃ and keeping the temperature for 20-30min, and finally raising the vacuum degree to 1-2mmHg and lowering the temperature to 200-210 ℃ and keeping the temperature for 5-10min; (3) Introducing the rice bran oil deodorized in the step (2) into a low-temperature plasma treatment device for low-temperature plasma treatment, wherein the power of the low-temperature plasma treatment is 100-300W, the treatment time is 5-15min, the vacuum degree during treatment is 10-30Pa, and inert gas is introduced as shielding gas during the low-temperature plasma treatment, wherein the inert gas is argon, and the introducing amount is 0.5-2L/min; (4) Cooling and filtering, namely cooling the rice bran oil treated in the step (3) to a certain temperature, and filtering to obtain the finished product rice bran oil.
  2. 2. The process according to claim 1, wherein the pretreatment in step (1) is carried out at a temperature of 50-70 ℃ and a stirring speed of 100-200r/min for a pretreatment time of 15-30min.
  3. 3. The process according to claim 1, wherein the purified nitrogen is introduced during the deodorization in the step (2), the purity of the nitrogen is more than or equal to 99.99%, and the introduced amount is 6-10% of the mass of the rice bran oil.
  4. 4. The process according to claim 1, wherein the cooling temperature in step (4) is 30-40 ℃, and the filtration is performed by using a ceramic membrane filter having a pore size of 0.2-0.5 μm.
  5. 5. The process according to claim 1, wherein the decolorized rice bran oil is subjected to moisture content detection before the step (1), the moisture content is controlled to be less than or equal to 0.1%, and if the moisture content exceeds the standard, the process is subjected to vacuum dehydration treatment, wherein the vacuum degree is 5-10mmHg, the temperature is 80-100 ℃, and the dehydration time is 20-30min.
  6. 6. The process according to claim 1, wherein the deodorizing tower in the step (2) is made of 316L stainless steel, and the inner wall of the deodorizing tower is coated with a nano titanium dioxide coating layer with a thickness of 5-10 μm.

Description

Rice bran oil deodorization technology for controlling generation of glycidyl ester Technical Field The invention relates to the field of rice bran oil processing, in particular to a rice bran oil deodorization process for controlling generation of glycidyl ester. Background The rice bran oil is a vegetable oil with higher nutritive value, and is rich in unsaturated fatty acid, vitamin E and other nutritive components. In the production process of rice bran oil, deodorization is a key refining link, and the main purpose of the deodorization is to remove peculiar smell substances in grease and improve the flavor and stability of the grease. However, the deodorization process is usually performed at high temperature, which results in the production of Glycidylesters (GEs) in rice bran oil. GEs is a potentially harmful substance, which presents a certain risk to human health, and therefore how to effectively control GEs production during deodorization is an important issue in rice bran oil production. In the prior art, methods of reducing the deodorization temperature, shortening the deodorization time, and increasing the vacuum degree are generally used for controlling the generation of GEs. However, these methods tend to affect the deodorizing effect, resulting in poor flavor and stability of rice bran oil. In addition, the formation of GEs is suppressed by adding an antioxidant or the like, but the effect is limited and new impurities may be introduced. Therefore, the development of the rice bran oil deodorization process which can not only effectively control GEs generation, but also ensure deodorization effect has important practical significance. Disclosure of Invention The application mainly aims to provide a rice bran oil deodorization process for controlling generation of glycidyl ester, and overcomes the defect that GEs generated in the rice bran oil deodorization process is difficult to control in the prior art. In order to achieve the above object, in a first aspect, the present application provides a rice bran oil deodorization process for controlling the formation of glycidylesters, comprising the steps of: (1) The composite chelation pretreatment, namely, the decolorized rice bran oil is sent to a pretreatment tank, and a composite chelant is added for pretreatment at a certain temperature and stirring speed; (2) Step (2) of gradient pressure swing deodorization, which is to send the rice bran oil treated in the step (1) into a deodorization tower for gradient pressure swing deodorization treatment, and control the temperature, time and vacuum degree change in the deodorization process; (3) Introducing the rice bran oil deodorized in the step (2) into a low-temperature plasma treatment device for low-temperature plasma treatment; (4) Cooling and filtering, namely cooling the rice bran oil treated in the step (3) to a certain temperature, and filtering to obtain the finished product rice bran oil. Optionally, the compound chelating agent in the step (1) is formed by compounding citric acid, phytic acid and disodium ethylenediamine tetraacetate according to the mass ratio of (1-3) (1-2) (0.5-1), wherein the addition amount of the compound chelating agent is 0.03-0.08% of the mass of rice bran oil. Optionally, the temperature of the pretreatment in the step (1) is 50-70 ℃, the stirring speed is 100-200r/min, and the pretreatment time is 15-30min. Optionally, the gradient pressure swing deodorization in the step (2) is specifically that the vacuum degree in the deodorization tower is controlled to be 1-2mmHg, the temperature is increased to be 200-220 ℃ and kept for 10-15min, then the vacuum degree is reduced to be 0.5-1mmHg, the temperature is increased to be 220-240 ℃ and kept for 20-30min, and finally the vacuum degree is increased to be 1-2mmHg, the temperature is reduced to be 200-210 ℃ and kept for 5-10min. Optionally, introducing purified nitrogen in the deodorization process in the step (2), wherein the purity of the nitrogen is more than or equal to 99.99%, and the introduced amount is 6-10% of the mass of the rice bran oil. Optionally, the power of the low-temperature plasma treatment in the step (3) is 100-300W, the treatment time is 5-15min, and the vacuum degree during the treatment is 10-30Pa. Optionally, during the low-temperature plasma treatment in the step (3), introducing inert gas as shielding gas, wherein the inert gas is argon, and the introducing amount is 0.5-2L/min. Optionally, the cooling temperature in the step (4) is 30-40 ℃, and the ceramic membrane filter with the pore diameter of 0.2-0.5 μm is adopted for filtering. Optionally, before the step (1), detecting the moisture content of the decolorized rice bran oil, controlling the moisture content to be less than or equal to 0.1%, and if the moisture content exceeds the standard, performing vacuum dehydration treatment, wherein the vacuum degree is 5-10mmHg, the temperature is 80-100 ℃, and the dehydration time is 20-30mi