Decolorizing agent for refined oil and fat and preparation method of refined oil and fat

Abstract

The present invention provides a decolorizing agent for refined oils and fats, wherein the decolorizing agent is activated clay loaded with calcium polysilicate. When the decolorizing agent of the present invention is used for oil refining, it can not only improve the decolorizing effect, but also can further effectively reduce the acid value of the oils and fats, thereby improving the quality of the oils and fats, and the preparation thereof is easy, the cost is low, and industrial application can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of oil refining, and in particular to a decolorizing agent for refined oil and a method for preparing the refined oil. Background Art

[0002] As a source of nutrients and energy, oils and fats are essential to the human body and are also important for providing the so-called sensory function, that is, satisfying food preferences such as taste or aroma. In order to meet edible requirements, oils and fats must go through a refining process to remove substances such as phospholipids, free fatty acids and pigments. The presence of these impurities not only reduces the storage stability of oils and fats, but also has a series of adverse effects on the deep processing of oils and fats.

[0003] Traditional refining processes for deacidification, decolorization and degumming of oils and fats include physical refining and chemical refining. Physically refined oils and fats are prone to thermal polymerization at high temperatures; chemical refining produces a lot of wastewater discharge, a large loss of neutral oil, and a low soap stock utilization rate. Currently, researchers are also constantly exploring new refining technologies, but these new technologies are difficult to achieve industrial application due to high costs or technical limitations. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a decolorizing agent for refined oils and a method for preparing refined oils. When the decolorizing agent is used in oil refining, it can not only improve the decolorizing effect, but also can further effectively reduce the acid value of the oil, thereby improving the quality of the oil. Moreover, it is easy to prepare, low in cost, and can be industrially applied.

[0005] The invention provides a decolorizing agent for refined oils and fats, which is activated white clay loaded with calcium polysilicate.

[0006] Preferably, the decolorizing agent is obtained by mixing activated clay and calcium polysilicate; preferably, the decolorizing agent is obtained by adding activated clay to water to obtain a suspension, then adding calcium polysilicate to mix, and drying.

[0007] Preferably, the weight ratio of the activated clay to calcium polysilicate is 1:0.1-0.6.

[0008] Preferably, the calcium polysilicate is obtained by reacting sodium silicate and calcium chloride; preferably, the calcium polysilicate is obtained by dissolving sodium silicate in water, adding hydrochloric acid to form a polymerized state, then adding calcium chloride to mix, mature, and dry.

[0009] Preferably, the weight ratio of sodium silicate to calcium chloride is 3-8:1.

[0010] The present invention also provides a method for preparing refined oils and fats, comprising: contacting the oils and fats with the above-mentioned decolorizing agent to complete adsorption decolorization.

[0011] Preferably, the oil is one or a combination of corn oil, soybean oil, cottonseed oil, linseed oil or palm oil.

[0012] Preferably, the decolorizing agent is used in an amount of 0.01-5 wt % of the oil.

[0013] Preferably, the contact treatment is carried out at a temperature of 60-90°C and for a time of 20-80 minutes.

[0014] The present invention provides a refined oil, which is prepared by the above preparation method.

[0015] The decolorizing agent for refined oils and fats of the present invention selects calcium polysilicate and activated white clay as a decolorizing agent based on the traditional use of activated white clay as an oil and fat decolorizing agent. On the basis of completing the decolorization of the oil and fat, the acid value of the oil and fat can be further reduced, so that the refined oil and fat prepared by the present invention has a higher quality. DETAILED DESCRIPTION

[0016] The technical solutions of the present invention are described in detail below through specific embodiments. However, it should be clearly stated that these embodiments are for illustration only and are not to be construed as limiting the scope of the present invention.

[0017] Example 1

[0018] A decolorizing agent for refined oils and fats, which is activated white clay loaded with calcium polysilicate, is prepared by the following method:

[0019] Sodium silicate is added into water and dissolved completely to obtain a 0.5 mol / L water glass solution, the water glass solution is slowly added dropwise into hydrochloric acid with a concentration of 1 mol / L, and the addition is stopped when the pH is adjusted to 2. After static activation for 30 minutes, an aqueous solution of calcium chloride is added and stirred evenly, the mass ratio of calcium chloride to sodium silicate is 1:7, and a gel solution is obtained after static aging for 180 minutes. The gel solution is dried at 120°C and ground into powder to obtain calcium polysilicate;

[0020] Activated clay is added to water with a weight of 10 times that of the activated clay, and the mixture is stirred to obtain a suspension. The suspension is heated to 60° C., and the calcium polysilicate is added under stirring, wherein the mass ratio of calcium polysilicate to activated clay is 0.3:1. The mixture is stirred for 180 minutes and then filtered, and dried at 120° C. to obtain activated clay loaded with calcium polysilicate, which is the decolorizer.

[0021] A method for preparing refined oil comprises: taking 120g corn oil to be decolorized (acid value 0.73mgKOH / g, color Y30, R4), heating to 60°C for drying and dehydration under vacuum conditions, then heating to 80°C in a water bath, adding 1.2g of the above-mentioned decolorizing agent under reduced pressure conditions and stirring evenly, stirring at a constant temperature for 40 minutes, filtering while hot, and then centrifuging to remove residual decolorizing agent in the oil to obtain the refined oil, and taking the upper layer of oil to determine the acid value and color.

[0022] Example 2

[0023] A decolorizing agent for refined oils and fats, which is activated white clay loaded with calcium polysilicate, is prepared by the following method:

[0024] Sodium silicate is added into water and dissolved completely to obtain a 0.5 mol / L water glass solution, and then the water glass solution is slowly added dropwise into hydrochloric acid with a concentration of 1 mol / L, and the addition is stopped when the pH is adjusted to 2. After static activation for 30 minutes, an aqueous solution of calcium chloride is added and stirred evenly, and the mass ratio of calcium chloride to sodium silicate is 1:8. After static aging for 180 minutes, a gel solution is obtained, and the gel solution is dried at 120° C. and ground into powder to obtain calcium polysilicate;

[0025] Activated clay is added to water with a weight of 10 times that of the activated clay, and the suspension is obtained after stirring. The suspension is heated to 60° C., and the calcium polysilicate is added under stirring, with a mass ratio of calcium polysilicate to activated clay of 0.1:1. After stirring for 180 minutes, the mixture is filtered and dried at 120° C. to obtain activated clay loaded with calcium polysilicate, which is the decolorizer.

[0026] A method for preparing refined oil comprises: taking 120g of soybean oil to be decolorized (acid value 0.38mgKOH / g, color Y70, R2), heating to 60°C for drying and dehydration under vacuum conditions, then heating to 90°C in a water bath, adding 0.12g of the above-mentioned decolorizing agent under reduced pressure conditions and stirring evenly, stirring at a constant temperature for 80 minutes, filtering while hot, and then centrifuging to remove residual decolorizing agent in the oil to obtain the refined oil, and taking the upper layer of oil to determine the acid value and color.

[0027] Example 3

[0028] A decolorizing agent for refined oils and fats, which is activated white clay loaded with calcium polysilicate, is prepared by the following method:

[0029] Sodium silicate is added into water and dissolved completely to obtain a 0.5 mol / L water glass solution, and then the water glass solution is slowly added dropwise into hydrochloric acid with a concentration of 1 mol / L, and the addition is stopped when the pH is adjusted to 2. After static activation for 30 minutes, an aqueous solution of calcium chloride is added and stirred evenly, and the mass ratio of calcium chloride to sodium silicate is 1:3. After static aging for 180 minutes, a gel solution is obtained; the gel solution is dried at 120° C. and ground into powder to obtain calcium polysilicate;

[0030] Activated clay is added to water with a weight of 10 times that of the activated clay, and the mixture is stirred to obtain a suspension. The suspension is heated to 60° C., and the calcium polysilicate is added under stirring, wherein the mass ratio of calcium polysilicate to activated clay is 0.6:1. The mixture is stirred for 180 minutes and then filtered, and dried at 120° C. to obtain activated clay loaded with calcium polysilicate, which is the decolorizer.

[0031] A method for preparing refined oil comprises: taking 120g corn oil to be decolorized (acid value 0.73mgKOH / g, color Y30, R4), heating to 60°C for drying and dehydration under vacuum conditions, then heating to 90°C in a water bath, adding 0.12g of the above-mentioned decolorizing agent under reduced pressure conditions and stirring evenly, stirring at a constant temperature for 80 minutes, filtering while hot, and then centrifuging to remove residual decolorizing agent in the oil to obtain the refined oil, and taking the upper layer of oil to determine the acid value and color.

[0032] Comparative Example 1

[0033] A method for preparing refined oil comprises: taking 120g corn oil to be decolorized (acid value 0.73mgKOH / g, color Y30, R4), heating to 60°C for drying and dehydration under vacuum conditions, then heating to 80°C in a water bath, adding 0.12g activated white clay under reduced pressure conditions and stirring evenly, stirring at a constant temperature for 40 minutes, filtering while hot, and then centrifuging to remove residual decolorizing agent in the oil to obtain the refined oil, and taking the upper layer of oil to determine the acid value and color.

[0034] Comparative Example 2

[0035] A method for preparing refined oils and fats comprises: taking 120 g of corn oil to be decolorized (acid value 0.73 mgKOH / g, color Y30, R4), heating to 60° C. under vacuum conditions for drying and dehydration, then heating to 80° C. in a water bath, adding 0.12 g of the calcium polysilicate described in Example 1 under reduced pressure and stirring evenly, stirring at a constant temperature for 40 minutes, filtering while hot, and then centrifuging to remove residual decolorizing agent in the oil to obtain the refined oils and fats, and taking the upper layer of oils and fats to determine the acid value and color.

[0036] Comparative Example 3

[0037] A method for preparing refined oil comprises: taking 120g of soybean oil to be decolorized (acid value 0.38mgKOH / g, color Y70, R2), heating to 60°C for drying and dehydration under vacuum conditions, then heating to 90°C in a water bath, adding 0.12g of activated white clay under reduced pressure conditions and stirring evenly, stirring at a constant temperature for 80 minutes, filtering while hot, and then centrifuging to remove residual decolorizing agent in the oil to obtain the refined oil, and taking the upper layer of oil to determine the acid value and color.

[0038] The refined oils and fats treated in the above-mentioned Examples 1-3 and Comparative Examples 1-3 were characterized, and the results are shown in the following table:

[0039]

[0040] In the table, the acid value is analyzed according to GB / T 5530-2005 "Determination of acid value and acidity of animal and vegetable oils and fats"; the color is analyzed according to GB / T 22460-2008 "Determination of Lovibond color of animal and vegetable oils and fats", and the WSL-2 Lovibond colorimeter is used for specific measurement.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A decolorizing agent for refined oils and fats, characterized in that: The decolorizing agent is activated clay loaded with calcium polysilicate; The decolorizing agent is obtained by adding activated clay into water to obtain a suspension, then adding calcium polysilicate to mix, and drying; The calcium polysilicate is obtained by dissolving sodium silicate in water, adding hydrochloric acid to form a polymerized state, then adding calcium chloride to mix, aging, and drying; The weight ratio of the activated clay to calcium polysilicate is 1:0.1-0.6; the weight ratio of the sodium silicate to calcium chloride is 3-8:

1.

2. A method for preparing refined oils and fats, characterized in that: include: The grease is contacted with the decolorizing agent according to claim 1 to complete adsorption decolorization.

3. The method for preparing refined oils and fats according to claim 2, characterized in that: The oil is one or a combination of corn oil, soybean oil, cottonseed oil, linseed oil or palm oil.

4. The method for preparing refined oils and fats according to claim 2 or 3, characterized in that: The amount of the decolorizing agent used is 0.01-5wt% of the oil.

5. The method for preparing refined oils and fats according to claim 2 or 3, characterized in that: The contact treatment is performed at a temperature of 60-90° C. and for a time of 20-80 minutes.

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