Anhydrous deacidification and desoaping agent for grease as well as preparation method and application of anhydrous deacidification and desoaping agent

Abstract

The invention relates to a grease anhydrous deacidification and desoaping agent as well as a preparation method and application thereof, and relates to the technical field of grease treatment agents, the preparation method comprises the following steps: performing extrusion sodium treatment on bentonite and an alkaline solid, and then performing grinding and sieving to obtain a grease deacidification agent; and mixing the grease deacidification agent, diatomite and citric acid to obtain the grease anhydrous deacidification and desoaping agent. After vegetable oil is deacidified and desoaped by using the anhydrous grease deacidification and desoaped agent prepared by the invention, crude peanut oil with the acid value of 3.37 and the soap content of 0.0076% is processed into clear oil with the acid value of less than 3 and the residual soap content of less than 0.0030%, and the product quality meets the edible standard of the vegetable oil. Meanwhile, sewage discharge is avoided, heat energy and electric energy are saved, the technological process and needed equipment are simple, the application prospect is good, the technology is stable, the production cost is low, and the novel industrial development requirements of energy conservation and emission reduction are completely met.

Description

Technical Field

[0001] The invention relates to the technical field of grease treatment agents, and in particular to an anhydrous grease deacidification and desoaping agent, a preparation method and application thereof. Background Art

[0002] Generally, unrefined crude oil contains a certain amount of free fatty acids (FFA). Under certain temperature and humidity conditions, the oil in the harvested oil crops will release FFA due to the catalytic hydrolysis of lipase. FFA is easier to oxidize than neutral oil. Excessive FFA content will not only affect the stability of the oil, but also reduce the smoke point and surface tension of the oil, which will have an adverse effect on the flavor of fried foods. Therefore, it is necessary to control the FFA content at a low level through technical means. The technical means to reduce the FFA content in oil is deacidification technology. The quality of deacidification technology directly affects the yield and quality of the final finished oil.

[0003] Conventional deacidification (also commonly known as alkali refining) methods are to add strong alkaline solutions such as potassium hydroxide, sodium hydroxide, and calcium hydroxide to the oil to react with the FFA in the oil to generate fatty acid sodium soap. Since the density of soap is greater than that of oil, it is easily soluble in water but difficult to dissolve in oil. It is necessary to go through a water washing process to reduce the residual soap in the oil, and then go through negative pressure vacuum dehydration to remove the residual water from alkali refining, and finally achieve the purpose of deacidification and desoaping. In this method, deacidification and desoaping are two completely independent processes, and the process is relatively long; and a large amount of rinsing wastewater that pollutes the environment is generated. The pollutants contained in it are mainly neutral oil and sodium salts of fatty acids in the form of soap. There are disadvantages such as complex process, high energy consumption, and environmental pollution.

[0004] In order to overcome the shortcomings of traditional deacidification methods, many new deacidification methods have been invented by researchers, such as chemical re-esterification deacidification, solvent extraction deacidification, supercritical extraction deacidification, molecular distillation deacidification, and enzymatic deacidification. The existing biological deacidification method has a long reaction time, expensive enzymes, and is currently only applicable to crude oils with high acid values. The chemical esterification deacidification method has a high cost, high solvent consumption, and high desolventizing costs. Adsorption deacidification refers to the use of solid materials that have an adsorption effect on FFA to remove FFA from oil. Adsorption deacidification has the advantages of simple process, low refining cost, and no pollution due to the realization of anhydrous refining. It has become a research hotspot in oil refining.

[0005] Patent CN 108841444 (a method for preparing an edible oil deacidifying agent) discloses a method for preparing an edible oil deacidifying agent. The invention uses food-grade montmorillonite, and obtains a solid deacidifying agent through acid activation, calcification, and organization. Although the acid value in vegetable oil can be reduced from 50 mgKOH / g to 4 mgKOH / g, the soap produced by deacidification cannot be removed at the same time.

[0006] Patent CN 106590727 (a method for preparing an alkaline ceramic deacidifier) ​​relates to a method for preparing an alkaline ceramic deacidifier. The invention uses diatomite as an aggregate to prepare diatomite ceramics, and then uses its three-dimensional network structure for modification to prepare diatomite-based porous ceramics with a multi-level pore structure, and finally uses it as a carrier to load alkali solution to prepare an alkaline ceramic deacidifier. The alkaline ceramic deacidifier prepared by the invention effectively removes FFA through the combined effects of physical adsorption and chemical adsorption, but has high requirements for the deacidification adsorbent and limited applicability.

[0007] Patent CN 107384587 (a deacidification method for cold-pressed peony seed oil) provides a deacidification method for cold-pressed peony seed oil. The method uses cold-pressed peony seed degummed oil as raw material, selects sodium hydroxide and diatomaceous earth to prepare an alkaline diatomaceous earth deacidification agent, and uses an ultrasonic-assisted method to synergistically deacidify the peony seed oil. It has a comprehensive effect of physical adsorption and chemical adsorption. On the one hand, it improves the deacidification efficiency of peony seed oil by accelerating the acid-base reaction rate, and on the other hand, it improves the quality of peony seed oil and retains its flavor. Although the content of trans fatty acids produced is low and the nutrients are retained, ultrasonic-assisted equipment is additionally required, and the applicability is limited.

[0008] Patent CN 102994224 (A method for anhydrous desoaping and pre-decolorization and refining of oils and fats) discloses a method for anhydrous desoaping and pre-decolorization and refining of oils and fats. First, a neutralization and anhydrous desoaping process is used to remove impurities, acid degumming, alkali refining deacidification and centrifugal desoaping of crude oil, and then the desoaped oil is directly vacuum dried; then a pre-decolorization process is carried out, including filter aid decolorization and mixed decolorization in a decolorization tower. The invention can effectively reduce the discharge of sewage in oil refining, and the deacidification, desoaping and decolorization effects are ideal, and the process is stable and the production cost is low. However, the high-temperature drying treatment under vacuum removes a large amount of vitamin E and phytosterol content in the oil, so this method reduces the nutritional quality of the oil, which is undesirable in oil refining.

[0009] Patent CN 105199845 (a method for removing soap from deacidified corn oil) provides a method for removing residual soap from deacidified corn oil by freezing adsorption. The purpose of the invention is to solve the problem of generating water washing wastewater and increasing oil loss during the existing water washing and soap removal. A method for removing residual soap from deacidified corn oil by freezing adsorption. The method for removing residual soap from deacidified corn oil by freezing adsorption is completed through the following three steps: 1. Preparation of deacidified corn oil by alkali refining; 2. Soap removal by freezing adsorption; 3. Filtering and separating soap. The dewaxed corn clear oil prepared by the present invention has a wax content of 50 mg / Kg, a residual soap content of 23.1 mg / Kg, and a soap removal rate of 92.8%. The method is used to remove the residual soap in the deacidified corn oil, and the dewaxing of the oil is completed at the same time. Although the deacidification and soap removal effect of the patent is good, there is still wastewater discharge, which increases the difficulty of wastewater treatment, and at the same time, the loss of oil also increases.

[0010] Patent CN 107090352 (A method for refining corn oil using a low-temperature anhydrous secondary desoaping process) provides a method for refining corn oil using a low-temperature anhydrous secondary desoaping process. The invention adopts a method for refining corn oil using a low-temperature anhydrous secondary desoaping process, replacing the water washing and drying processes in the traditional alkali refining with a secondary desoaping process using diatomaceous earth and activated white clay for adsorption under low temperature conditions, and the diatomaceous earth also plays a role in filtering. The low-temperature anhydrous secondary desoaping process uses diatomaceous earth and activated white clay to absorb and desoap respectively instead of the water washing process after alkali refining and deacidification, which can reduce the amount of residual soap in the deacidified oil and make it meet the requirements of the decolorization process. Although the low-temperature anhydrous secondary desoaping process has the effect of reducing environmental pollution and saving energy, the process line is long and the applicability is also limited.

[0011] The selection and preparation of adsorbents are the key to adsorption deacidification technology. From the above-mentioned adsorption deacidification-related patent methods, the materials currently used to prepare adsorption deacidification agents include activated clay, attapulgite, activated carbon, zeolite, acidified rice husk ash, etc. However, the existing adsorption deacidification agents have problems such as insufficient soap removal, long cycle, limited applicability, or the generation of washing wastewater and increased oil loss. They cannot meet the requirements of effectively removing oleic acid without washing and avoiding excessive soap. Therefore, it is of great significance to develop an adsorbent that can achieve waterless soap removal during deacidification, which is also one of the research hotspots and focuses in this technical field. Summary of the invention

[0012] In order to solve the above problems, the present invention provides an anhydrous deacidification and desoaping agent for grease, and a preparation method and application thereof.

[0013] In a first aspect, the present invention provides a method for preparing an anhydrous deacidification and desoaping agent for oils and fats, the preparation method comprising the following steps:

[0014] The bentonite and alkaline solid are squeezed and sodiumized, and then ground and sieved to obtain a grease deacidification agent;

[0015] The oil deacidification agent, diatomaceous earth and citric acid are mixed to obtain the oil anhydrous deacidification and desoaping agent.

[0016] Furthermore, the working condition parameters of the extrusion sodiumization include: a pressure of 15 to 40 MPa and a time of 10 to 30 minutes.

[0017] Furthermore, the amount of the alkaline solid added is 10% to 25% of the bentonite by mass fraction.

[0018] Furthermore, the alkaline solid is selected from two of sodium hydroxide, potassium hydroxide, sodium carbonate and potassium carbonate, preferably potassium hydroxide and sodium carbonate; the particle size of the oil deacidification agent is 40-150 mesh, and the particle size of the alkaline solid is 60-120 mesh.

[0019] Furthermore, the amount of the diatomaceous earth added is 50%-150% of the oil deacidification agent by mass; and the amount of the citric acid added is 1%-5% of the oil deacidification agent by mass.

[0020] Furthermore, the amount of diatomaceous earth added is 75%-125% of the oil deacidification agent by mass fraction; the amount of citric acid added is 1%-3% of the oil deacidification agent by mass fraction; and the particle size of the oil deacidification agent is 60-100 meshes.

[0021] In a second aspect, the present invention provides an anhydrous deacidification and desoaping agent for oils and fats, wherein the anhydrous deacidification and desoaping agent for oils and fats is prepared by the preparation method described in any one of the first aspects.

[0022] In a third aspect, the present invention provides use of the anhydrous oil deacidification and desoaping agent described in any one of the first aspect and any one of the second aspect in the deacidification and desoaping of vegetable oil.

[0023] In a fourth aspect, the present invention provides a method for deacidification and desoapification of vegetable oil, the method comprising the following steps:

[0024] Add the anhydrous oil deacidification and desoaping agent according to any one of the first aspect and the second aspect to the vegetable oil, and then stir to obtain a mixture;

[0025] The mixture is cooled and adsorbed at room temperature, and then centrifuged to obtain deacidified and desoaped vegetable oil.

[0026] Furthermore, the vegetable oil includes peanut oil, rapeseed oil, soybean oil, linseed oil or corn oil, preferably squeezed peanut crude oil; the temperature of the vegetable oil is 50-80°C, preferably 60-70°C;

[0027] In terms of mass fraction, the amount of the anhydrous oil deacidification and desoaping agent added is 2.5-8.0‰ of the vegetable oil, preferably 4.0-6.0‰.

[0028] The above technical solution provided by the embodiment of the present invention has at least the following advantages compared with the prior art:

[0029] The embodiment of the present invention provides an anhydrous deacidification and desoaping agent for oils and fats and a preparation method and application thereof. The present invention uses bentonite as an aggregate, then mixes it with diatomaceous earth, and then modifies it with alkaline solid and citric acid to prepare an acidification and desoaping adsorbent. The anhydrous deacidification and desoaping agent for oils and fats prepared by the present invention utilizes its own advantages such as being porous, having a large specific surface area, and having a strong adsorption capacity to increase the effective contact area with free fatty acids, and effectively adsorbs and fixes the generated saponins, so that while adsorbing and deacidifying, the saponins generated in the deacidification process can also be further removed, and the deacidification and desoaping process is carried out under low temperature conditions without a violent chemical reaction process, and while reducing the acid value and soap content, the original flavor of the oils and fats can be retained to the maximum extent. After deacidification and desoaping using the adsorbent prepared by the present invention, peanut crude oil with an acid value of 3.37 and a soap content of 0.0076% is processed into clear oil with an acid value of less than 3 and a residual soap content of less than 0.0030%, and the product quality meets the edible standard of vegetable oils. The present invention does not discharge sewage, saves heat and electricity, has a simple process flow and required equipment, has good application prospects, and has a stable process and low production cost, which fully meets the needs of new industrial development for energy conservation and emission reduction. Specifically:

[0030] (1) Bentonite is widely distributed in my country and is inexpensive. Alkaline sodium-based bentonite is obtained by sodium treatment. It is a solid alkaline deacidification agent. It can be easily filtered and purified when added to edible oil. The large specific surface area of ​​sodium-based bentonite can be well combined with FFA in vegetable oil, effectively absorbing the generated soap while reducing the acid value in the edible oil. At the same time, the addition of diatomaceous earth and citric acid can remove some of the soap stock produced by the alkaline modifier, further achieving the purpose of desoaping.

[0031] (2) Bentonite and diatomaceous earth are processing aids used in the food industry. There is no limit on their use, so their use in the oil and fat industry is relatively safe.

[0032] (3) The adsorbent of the present invention performs the deacidification and desoaping processes simultaneously, which has a simple process flow, short time consumption, and effectively reduces energy consumption.

[0033] (4) After testing, after deacidification and desoaping using the adsorbent prepared by the present invention, the crude peanut oil with an acid value of 3.37 and a soap content of 0.0076% was processed into a clear oil with an acid value of less than 3 and a residual soap content of less than 0.0030%, and the product quality met the national standards "GB 5009.229-2016 Determination of Acid Value in Food" and "GBT 5533-2008 Grain and Oil Inspection Determination of Soap Content in Vegetable Oils".

[0034] (5) The use of the above-mentioned anhydrous desoaping agent saves the step of oil deacidification and water washing, simplifies the conventional alkali refining and deacidification process, greatly reduces the amount of washing water used in vegetable oil deacidification, and thus reduces the amount of wastewater generated, avoiding environmental pollution caused by wastewater discharge.

[0035] (6) The deacidification and desoaping adsorbent prepared by the present invention has good adsorption effect, can fully contact with oil, and the loss of neutral oil in the deacidification and desoaping process is also reduced. At the same time, the precipitate can be quickly separated from the oil, the oil yield is increased, and the oil loss rate is low.

[0036] (7) Through the above application method, the operating conditions are mild, which prevents the vegetable oil from deteriorating at high temperatures, well protects the unsaturated fatty acids in the oil, and retains the trace nutrients in the raw materials and the excellent quality of the product to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0039] Figure 1 A schematic flow chart of a method for preparing an anhydrous oil deacidification and desoaping agent provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0041] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0042] In a first aspect, the present invention provides a method for preparing an anhydrous deacidification and desoaping agent for oils and fats, such as Figure 1 As shown, the preparation method comprises the following steps:

[0043] The bentonite and alkaline solid are squeezed and sodiumized, and then ground and sieved to obtain a grease deacidification agent;

[0044] The oil deacidification agent, diatomaceous earth and citric acid are mixed to obtain the oil anhydrous deacidification and desoaping agent.

[0045] The present invention uses bentonite as aggregate, then mixes it with diatomite, and then modifies it with alkaline solid and citric acid to prepare a deacidification and desoaping adsorbent. The oil anhydrous deacidification and desoaping agent prepared by the present invention utilizes its own advantages of being porous, having a large specific surface area, and having a strong adsorption capacity, so as to increase the effective contact area with free fatty acids, and effectively adsorb and fix the generated saponins, so that while adsorbing and deacidifying, the saponins generated in the deacidification process can also be further removed, and the deacidification and desoaping process is carried out under low temperature conditions without a violent chemical reaction process, and while reducing the acid value and soap content, the original flavor of the oil can be retained to the maximum extent. After deacidification and desoaping using the adsorbent prepared by the present invention, peanut crude oil with an acid value of 3.37 and a soap content of 0.0076% is processed into clear oil with an acid value of less than 3 and a residual soap content of less than 0.0030%, and the product quality meets the edible standard of vegetable oil. The present invention has no sewage discharge, saves heat and electricity, has simple process flow and required equipment, has good application prospects, stable process, low production cost, and fully meets the needs of new industrial development of energy conservation and emission reduction.

[0046] In some specific embodiments, the working condition parameters of the extrusion sodiumization include: a pressure of 15 to 40 MPa and a time of 10 to 30 minutes.

[0047] In some specific embodiments, the amount of the alkaline solid added is 10% to 25% of the bentonite by mass.

[0048] In some specific embodiments, the alkaline solid is selected from two of sodium hydroxide, potassium hydroxide, sodium carbonate and potassium carbonate, preferably potassium hydroxide and sodium carbonate; the particle size of the oil deacidification agent is 40-150 mesh, and the particle size of the alkaline solid is 60-120 mesh.

[0049] In some specific embodiments, the amount of diatomaceous earth added is 50%-150% of the oil deacidification agent by mass; the amount of citric acid added is 1%-5% of the oil deacidification agent by mass.

[0050] In some specific embodiments, the amount of diatomaceous earth added is 75%-125% of the oil deacidification agent by mass; the amount of citric acid added is 1%-3% of the oil deacidification agent by mass; and the particle size of the oil deacidification agent is 60-100 mesh.

[0051] In a second aspect, the present invention provides an anhydrous deacidification and desoaping agent for oils and fats, wherein the anhydrous deacidification and desoaping agent for oils and fats is prepared by the preparation method described in any one of the first aspects.

[0052] In a third aspect, the present invention provides use of the anhydrous oil deacidification and desoaping agent described in any one of the first aspect and any one of the second aspect in the deacidification and desoaping of vegetable oil.

[0053] In a fourth aspect, the present invention provides a method for deacidification and desoapification of vegetable oil, the method comprising the following steps:

[0054] Add the anhydrous oil deacidification and desoaping agent according to any one of the first aspect and the second aspect to the vegetable oil, and then stir to obtain a mixture;

[0055] The mixture is cooled and adsorbed at room temperature, and then centrifuged to obtain deacidified and desoaped vegetable oil.

[0056] In some specific embodiments, the vegetable oil includes peanut oil, rapeseed oil, soybean oil, linseed oil or corn oil, preferably squeezed peanut crude oil; the temperature of the vegetable oil is 50-80° C., preferably 60-70° C.;

[0057] In terms of mass fraction, the amount of the anhydrous oil deacidification and desoaping agent added is 2.5-8.0‰ of the vegetable oil, preferably 4.0-6.0‰.

[0058] It should be noted that the components and raw materials involved in the anhydrous deacidification and desoaping agent for grease and its preparation method and application provided in the embodiments of the present invention, unless otherwise specified or specified, can be directly commercially available products or homemade using existing public preparation methods; at the same time, the steps and parameters involved, unless otherwise specified or specified, can be carried out according to the existing processing technology of the anhydrous deacidification and desoaping agent for grease or directly using existing equipment, and the present invention document will not repeat them one by one.

[0059] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples that do not specify specific conditions are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0060] Example 1

[0061] This embodiment relates to an anhydrous deacidification and desoaping agent for grease, and a preparation method and application thereof, which comprises the following steps:

[0062] (1) Preparation of deacidification agent: Take an appropriate amount of bentonite, add 20% by mass of alkaline solid, fully disperse and then pass through an extruder for sodiumization at a pressure of 25 MPa for 20 minutes; grind and pass through a 100 mesh sieve to obtain a grease deacidification agent;

[0063] (2) Compound deacidification and desoaping adsorbent: Take an appropriate amount of deacidification agent, add 50% by mass of diatomaceous earth, add 1% by mass of citric acid, and mix the three evenly to obtain a grease deacidification and desoaping agent.

[0064] (3) Application process: Add the anhydrous deacidification and desoaping agent prepared by the present invention to 80°C vegetable oil at an addition amount of 6.0‰, stir at 300r / min, cool and adsorb at room temperature for 30min, and then place the mixture in a centrifuge for centrifugation to obtain deacidified and desoaped vegetable oil.

[0065] Example 2

[0066] This embodiment relates to an anhydrous deacidification and desoaping agent for grease, and a preparation method and application thereof, which comprises the following steps:

[0067] (1) Preparation of deacidification agent: Take an appropriate amount of bentonite, add 15% by mass of alkaline solid, fully disperse and then pass through an extruder for sodiumization at a pressure of 40 MPa for 10 minutes; grind and pass through a 120-mesh sieve to obtain a grease deacidification agent;

[0068] (2) Compound deacidification and desoaping adsorbent: Take an appropriate amount of deacidification agent, add 125% by mass of diatomaceous earth, add 5% by mass of citric acid, and mix the three evenly to obtain a grease deacidification and desoaping agent.

[0069] (3) Application process: Add the anhydrous deacidification and desoaping agent prepared by the present invention to 80°C vegetable oil at an addition amount of 8.0‰, stir at 200r / min, cool and adsorb at room temperature for 30min, and then place the mixture in a centrifuge for centrifugation to obtain deacidified and desoaped vegetable oil.

[0070] Example 3

[0071] This embodiment relates to an anhydrous deacidification and desoaping agent for grease, and a preparation method and application thereof, which comprises the following steps:

[0072] (1) Preparation of deacidification agent: Take an appropriate amount of bentonite, add 10% by mass of alkaline solid, fully disperse and then pass through an extruder for sodiumization at a pressure of 15 MPa for 30 minutes; grind and pass through a 100 mesh sieve to obtain a grease deacidification agent;

[0073] (2) Compound deacidification and desoaping adsorbent: Take an appropriate amount of deacidification agent, add 100% by mass of diatomaceous earth, add 4% by mass of citric acid, and mix the three evenly to obtain a grease deacidification and desoaping agent.

[0074] (3) Application process: Add the anhydrous deacidification and desoaping agent prepared by the present invention to 70°C vegetable oil at an addition amount of 6.0‰, stir at 300r / min, cool and adsorb at room temperature for 35 minutes, and then place the mixture in a centrifuge for centrifugation to obtain deacidified and desoaped vegetable oil.

[0075] Example 4

[0076] This embodiment relates to an anhydrous deacidification and desoaping agent for grease, and a preparation method and application thereof, which comprises the following steps:

[0077] (1) Preparation of deacidification agent: Take an appropriate amount of bentonite, add 20% by mass of alkaline solid, fully disperse and then pass through an extruder for sodiumization at a pressure of 20 MPa for 20 minutes; grind and pass through an 80-mesh sieve to obtain a grease deacidification agent;

[0078] (2) Compound deacidification and desoaping adsorbent: Take an appropriate amount of deacidification agent, add 75% by mass of diatomaceous earth, add 2% by mass of citric acid, and mix the three evenly to obtain a grease deacidification and desoaping agent.

[0079] (3) Application process: Add the anhydrous deacidification and desoaping agent prepared by the present invention to 70°C vegetable oil at an addition amount of 5.0‰, stir at 200r / min, cool and adsorb at room temperature for 45 minutes, and then place the mixture in a centrifuge for centrifugation to obtain deacidified and desoaped vegetable oil.

[0080] Comparative Example 1

[0081] This example provides an anhydrous deacidification and desoaping agent for grease, and a preparation method and application thereof, which is different from Example 2 only in that diatomaceous earth is not added; the remaining steps and parameters are the same.

[0082] Comparative Example 2

[0083] This example provides an anhydrous deacidification and desoaping agent for grease, a preparation method and an application thereof, which is different from Example 2 only in that the amount of solid alkali used is 5%; the remaining steps and parameters are the same.

[0084] The test and analysis results of the deacidified and desoaped vegetable oils and crude oil obtained in the above examples and comparative examples are shown in Table 1.

[0085] Table 1

[0086]

[0087]

[0088] It can be seen from Table 1 above that, compared with Comparative Examples 1 to 2, the anhydrous oil deacidification and desoaping agents obtained in Examples 1 to 4 of the present invention have better deacidification and desoaping functions.

[0089] Various embodiments of the present invention may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present invention; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0090] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may 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 the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for preparing an anhydrous deacidification and desoaping agent for grease, characterized in that: The preparation method comprises the following steps: The bentonite and alkaline solid are squeezed and sodiumized, and then ground and sieved to obtain a grease deacidification agent; The oil deacidification agent, diatomaceous earth and citric acid are mixed to obtain the oil anhydrous deacidification and desoaping agent.

2. The method for preparing the anhydrous deacidification and desoaping agent for grease according to claim 1, characterized in that: The working condition parameters of the extrusion sodiumization include: a pressure of 15 to 40 MPa and a time of 10 to 30 minutes.

3. The method for preparing the anhydrous deacidification and desoaping agent for grease according to claim 1, characterized in that: Calculated by mass fraction, the added amount of the alkaline solid accounts for 10% to 25% of the bentonite.

4. The method for preparing the anhydrous deacidification and desoaping agent for grease according to claim 1, characterized in that: The alkaline solid is selected from two of sodium hydroxide, potassium hydroxide, sodium carbonate and potassium carbonate; the particle size of the oil deacidification agent is 40-150 meshes, and the particle size of the alkaline solid is 60-120 meshes.

5. The method for preparing the anhydrous deacidification and desoaping agent for grease according to claim 1, characterized in that: Calculated by mass fraction, the added amount of the diatomaceous earth accounts for 50%-150% of the oil deacidification agent; calculated by mass fraction, the added amount of the citric acid accounts for 1%-5% of the oil deacidification agent.

6. The method for preparing an anhydrous deacidification and desoaping agent for grease according to claim 1, characterized in that: The amount of diatomaceous earth added is 75%-125% of the oil deacidification agent by mass fraction; the amount of citric acid added is 1%-3% of the oil deacidification agent by mass fraction; the particle size of the oil deacidification agent is 60-100 meshes.

7. A grease anhydrous deacidification and desoaping agent, characterized in that: The anhydrous oil deacidification and desoaping agent is prepared by the preparation method described in any one of claims 1 to 6.

8. Use of the anhydrous oil deacidification and desoaping agent according to any one of claims 1 to 7 in the deacidification and desoaping of vegetable oils.

9. A method for deacidification and desoaping of vegetable oil, characterized in that: The method comprises the following steps: Adding the anhydrous oil deacidification and desoaping agent according to any one of claims 1 to 7 to vegetable oil, followed by stirring to obtain a mixture; The mixture is cooled and adsorbed at room temperature, and then centrifuged to obtain deacidified and desoaped vegetable oil.

10. The method for deacidification and desoaping of vegetable oil according to claim 9, characterized in that: The vegetable oil includes peanut oil, rapeseed oil, soybean oil, linseed oil or corn oil; the temperature of the vegetable oil is 50-80°C; Calculated by mass fraction, the added amount of the anhydrous oil deacidification and desoaping agent accounts for 2.5-8.0‰ of the vegetable oil.

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