A desalting process for kitchen waste oil

Abstract

The present application relates to the technical field of oil and fat waste treatment, and provides a kind of kitchen waste oil and fat desalination process, comprising the following steps: S1, oil and fat is filtered, broken, separated, and the oil and fat after treatment is obtained;S2, after adding water and auxiliary agent in the oil and fat after treatment, stirring, oil-water separation, and the oil and fat after desalination is obtained;Auxiliary agent includes the following components by weight: calcium tartrate 2~15 parts, dipropyl ketone acrylamide 2~12 parts, sodium bicarbonate 3~7 parts, organic amine 10~18 parts, demulsifier 2~4 parts, activated carbon 15~25 parts.Through the above technical scheme, the problem of low salt removal efficiency in kitchen waste oil and fat in the related art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil waste treatment, in particular to a kitchen waste oil desalination process. BACKGROUND

[0002] The salt in kitchen waste oil usually exists in the form of inorganic salt such as sodium chloride, but there may also be some other chlorides. Some of these salts are dissolved in the small amount of water contained in the oil, or are attached to the surface of the oil in the form of small particles, and thus exist in the kitchen waste oil. When recycling kitchen waste oil, it is usually necessary to separate the oil from other impurities, and the presence of salt will interfere with the further processing of kitchen waste oil. For example, the kitchen waste oil is further processed for the production of biodiesel, etc., and the ester exchange reaction in the production of biodiesel may affect the activity of the catalyst, resulting in a decrease in reaction efficiency or even failure to proceed normally, thereby affecting the yield and quality of biodiesel. Furthermore, from the perspective of equipment maintenance, these chlorides are corrosive, and if the salt content is too high in the recycling and processing equipment of kitchen waste oil, long-term contact will corrode the metal parts of the equipment, shorten the service life of the equipment, increase the equipment maintenance cost and replacement frequency, and is not conducive to the long-term stable operation of the recycling and processing process.

[0003] At present, the separation of oil and salt is usually achieved by electric desalting. Electric desalting mainly relies on the action of electric field force on water droplets and the density difference between oil and water to achieve the desalination process. However, this method can only reduce the salt content in the medium to a certain extent, and the removal efficiency is limited. Therefore, a method for efficiently removing salt from kitchen waste oil is proposed, which is of great significance for improving the recycling of oil. SUMMARY

[0004] The present application provides a kitchen waste oil desalination process, which solves the problem of low salt removal efficiency in kitchen waste oil in the related art.

[0005] The technical scheme of the present application is as follows:

[0006] The present application provides a kitchen waste oil desalination process, which includes the following steps:

[0007] S1, filtering, crushing and separating the oil to obtain treated oil;

[0008] S2, adding water and an additive to the treated oil, stirring, and separating the oil and water to obtain desalted oil;

[0009] The additive includes the following components by weight:

[0010] calcium tartrate 2-15 parts, diacetone acrylamide 2-12 parts, sodium bicarbonate 3-7 parts, organic amine 10-18 parts, demulsifier 2-4 parts, activated carbon 15-25 parts.

[0011] As a further technical solution, the weight ratio of the calcium tartrate and the diacetone acrylamide is 3-6:2.

[0012] When the weight ratio of the calcium tartrate and the diacetone acrylamide is 3-6:2, the salt removal efficiency in the kitchen waste oil can be further improved.

[0013] As a further technical solution, the activated carbon is an activated carbon loaded with an amido carboxylic complexing agent, and the raw material of the activated carbon loaded with the amido carboxylic complexing agent includes the activated carbon and the amido carboxylic complexing agent.

[0014] As a further technical solution, the amido carboxylic complexing agent includes iminodiacetic acid.

[0015] When the amido carboxylic complexing agent includes iminodiacetic acid, by loading iminodiacetic acid on the activated carbon, the adsorption sites of the activated carbon are increased, and the activated carbon can be better dispersed in the oil system, thereby improving the adsorption effect of the activated carbon on the salt in the oil, and further improving the salt removal efficiency in the kitchen waste oil.

[0016] As a further technical solution, the weight ratio of the activated carbon and the amido carboxylic complexing agent is 30:2-6.

[0017] When the weight ratio of the activated carbon and the amido carboxylic complexing agent is 30:2-6, the salt removal efficiency in the kitchen waste oil can be further improved.

[0018] As a further technical solution, the preparation method of the activated carbon loaded with the amido carboxylic complexing agent includes the following steps: after the amido carboxylic complexing agent is dispersed in water, the activated carbon is added, soaked, and dried to obtain the activated carbon loaded with the amido carboxylic complexing agent.

[0019] As a further technical solution, the amido carboxylic complexing agent further includes hydroxyethyl iminodiacetic acid.

[0020] The inventor found that when the amido carboxylic complexing agent further includes hydroxyethyl iminodiacetic acid, loading iminodiacetic acid and hydroxyethyl iminodiacetic acid on the activated carbon together can further improve the salt removal efficiency in the kitchen waste oil. It is speculated that when the amido carboxylic complexing agent further includes hydroxyethyl iminodiacetic acid, hydroxyethyl iminodiacetic acid can have a synergistic effect with iminodiacetic acid, so that the effect of the activated carbon on the salt is further improved, thereby further improving the salt removal efficiency in the kitchen waste oil.

[0021] As a further technical solution, the weight ratio of the iminodiacetic acid and the hydroxyethyl iminodiacetic acid is 2-5:1.

[0022] When the weight ratio of the iminodiacetic acid and the hydroxyethyl iminodiacetic acid is 2-5:1, the removal efficiency of salt in the kitchen waste oil can be further improved.

[0023] As a further technical solution, the temperature during the immersion is 50-60 DEG C, and the time is 1-2h.

[0024] As a further technical solution, the demulsifier comprises one or more of fatty alcohol polyoxyethylene ether, octylphenol polyoxyethylene ether, and castor oil polyoxyethylene ether.

[0025] As a further technical solution, the organic amine is one or more of ethanolamine, ethylenediamine, and 2-ethylhexylamine.

[0026] As a further technical solution, in step S1, during the filtration, a screen with a pore size of 0.1-0.15mm is used at 50-60 DEG C.

[0027] As a further technical solution, in step S2, the amount of water added is 15%-30% of the volume of the treated oil; and the mass-volume ratio of the additive to the treated oil is 3-4:2000 g / mL.

[0028] As a further technical solution, in step S2, during the stirring, the temperature is 85-95 DEG C, and the time is 2-3h.

[0029] The working principle and beneficial effects of the present application are as follows:

[0030] In the present application, water and an additive are added to the treated oil, the additive comprising calcium tartrate and diacetone acrylamide, and the calcium tartrate and diacetone acrylamide have a synergistic effect, and by using the calcium tartrate and diacetone acrylamide together, the kitchen waste oil can be reacted, the aggregation of the oil in water is reduced, the oil is hydrated, and in combination with other additives, the salt in the oil can be effectively separated, and thus the removal efficiency of salt in the kitchen waste oil is improved. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are involved in the scope of protection of the present application.

[0032] In the following examples and comparative examples, the model of castor oil polyoxyethylene ether is EL-10; the activated carbon is coconut shell activated carbon, the model is HSQ-04, the particle size is 40 mesh, and the specific surface area is 1500 m 2 / g, and the filling density is 600 g / cm 3 .

[0033] Example 1

[0034] A kitchen waste oil desalination process, comprising the following steps:

[0035] S1, the oil is filtered at 50 DEG C with a sieve with a pore size of 0.1 mm, broken, separated, and the treated oil is obtained;

[0036] S2, after adding water and additives to the treated oil, stirring at 85 DEG C for 3h, oil-water separation, and obtaining the desalted oil;

[0037] The amount of water added is 15% of the volume of the treated oil; the mass-volume ratio of the additive to the treated oil is 3g:2000ml;

[0038] The additive comprises the following components by weight:

[0039] 2 parts of calcium tartrate, 2 parts of diacetone acrylamide, 3 parts of sodium bicarbonate, 10 parts of 2-ethylhexylamine, 2 parts of castor oil polyoxyethylene ether, and 15 parts of activated carbon.

[0040] Example 2

[0041] A kitchen waste oil desalination process, comprising the following steps:

[0042] S1, the oil is filtered at 55 DEG C with a sieve with a pore size of 0.15 mm, broken, separated, and the treated oil is obtained;

[0043] S2, after adding water and additives to the treated oil, stirring at 90 DEG C for 2.5h, oil-water separation, and obtaining the desalted oil;

[0044] The amount of water added is 30% of the volume of the treated oil; the mass-volume ratio of the additive to the treated oil is 4g:2000ml;

[0045] The additive comprises the following components by weight:

[0046] 6 parts of calcium tartrate, 10 parts of diacetone acrylamide, 5 parts of sodium bicarbonate, 14 parts of 2-ethylhexylamine, 3 parts of castor oil polyoxyethylene ether, and 20 parts of activated carbon.

[0047] Example 3

[0048] A kitchen waste oil desalination process, comprising the following steps:

[0049] S1, filter, crush, separate the oil at 60℃ with a screen having a pore size of 0.15mm to obtain treated oil;

[0050] S2, after adding water and an additive to the treated oil, stir at 95℃ for 2h, separate the oil and water to obtain desalted oil;

[0051] The amount of water added is 25% of the volume of the treated oil; the mass-volume ratio of the additive to the treated oil is 3.5g:2000mL;

[0052] The additive comprises the following components by weight:

[0053] 15 parts of calcium tartrate, 12 parts of diacetone acrylamide, 7 parts of sodium bicarbonate, 18 parts of 2-ethylhexylamine, 4 parts of castor oil polyoxyethylene ether, and 25 parts of activated carbon.

[0054] Example 4

[0055] The difference between this example and Example 2 is that in this example, 14 parts of calcium tartrate and 2 parts of diacetone acrylamide are added.

[0056] Example 5

[0057] The difference between this example and Example 2 is that in this example, 9.6 parts of calcium tartrate and 6.4 parts of diacetone acrylamide are added.

[0058] Example 6

[0059] The difference between this example and Example 2 is that in this example, 12 parts of calcium tartrate and 4 parts of diacetone acrylamide are added.

[0060] Example 7

[0061] The difference between this example and Example 6 is that in this example, the activated carbon is activated carbon loaded with aminocarboxyl complexing agent, and the preparation method comprises the following steps: dispersing 1 part of iminodiacetic acid in 15 parts of water, adding 30 parts of activated carbon, and dipping at 50℃ for 2h, and drying to obtain activated carbon loaded with aminocarboxyl complexing agent.

[0062] Example 8

[0063] The difference between this example and Example 7 is that in this example, 7 parts of iminodiacetic acid are added.

[0064] Example 9

[0065] The difference between this example and Example 7 is that in this example, 2 parts of iminodiacetic acid are added.

[0066] Example 10

[0067] The difference between this example and Example 7 is that in this example, 6 parts of iminodiacetic acid are added.

[0068] Example 11

[0069] The difference between this example and Example 10 is that in this example, iminodiacetic acid is replaced with an equivalent amount of hydroxyethyl iminodiacetic acid.

[0070] Example 12

[0071] The difference between this example and Example 10 is that in this example, 6 parts of iminodiacetic acid are replaced with 3 parts of iminodiacetic acid and 3 parts of hydroxyethyl iminodiacetic acid.

[0072] Example 13

[0073] The difference between this example and Example 10 is that in this example, 6 parts of iminodiacetic acid are replaced with 5.5 parts of iminodiacetic acid and 0.5 parts of hydroxyethyl iminodiacetic acid.

[0074] Example 14

[0075] The difference between this example and Example 10 is that in this example, 6 parts of iminodiacetic acid are replaced with 4 parts of iminodiacetic acid and 2 parts of hydroxyethyl iminodiacetic acid.

[0076] Example 15

[0077] The difference between this example and Example 10 is that in this example, 6 parts of iminodiacetic acid are replaced with 5 parts of iminodiacetic acid and 1 part of hydroxyethyl iminodiacetic acid.

[0078] Comparative Example 1

[0079] The difference between this comparative example and Example 1 is that in this comparative example, no calcium tartrate is added, and 4 parts of diacetone acrylamide are added.

[0080] Comparative Example 2

[0081] The difference between this comparative example and Example 1 is that in this comparative example, no diacetone acrylamide is added, and 4 parts of calcium tartrate are added.

[0082] Comparative Example 3

[0083] The difference between this comparative example and Example 1 is that in this comparative example, neither calcium tartrate nor diacetone acrylamide is added.

[0084] The kitchen waste oil containing 35.75 mg / L NaCl and 71.46 ppm total chlorine content was desalted by the method of examples 1-15 and comparative examples 1-3, and then the inorganic salt content was determined according to the method in SY / T 0536-2008 "Determination of salt content in crude oil - Coulometric method", and the total chlorine content was tested by a microcomputer sulfur-chlorine analyzer (model ZWK-3000), wherein the electrolyte used in the total chlorine content test process was a volume ratio of 7:3 of high-purity glacial acetic acid and pure water, and the sample size was 4 μL.

[0085] The test results are shown in Table 1.

[0086] Table 1: Salt content determination results in examples 1-15 and comparative examples 1-3

[0087]

[0088] Compared with comparative examples 1-3, the inorganic salt content and the total chlorine content in example 1 are significantly reduced, indicating that when calcium tartrate and dipropyl ketone acrylamide are added to the auxiliary, the two have a synergistic effect, which can improve the removal efficiency of salt in kitchen waste oil.

[0089] Compared with examples 2 and 4, the inorganic salt content and the total chlorine content in examples 5-6 are reduced, indicating that when the weight ratio of calcium tartrate and dipropyl ketone acrylamide is 3-6:2, the removal efficiency of salt in kitchen waste oil can be further improved.

[0090] Compared with example 6, the inorganic salt content and the total chlorine content in examples 7-10 are reduced, indicating that when the amino carboxylic complexing agent is imino diacetic acid, by loading imino diacetic acid on activated carbon, the removal efficiency of salt in kitchen waste oil can be further improved.

[0091] Compared with examples 7-8, the inorganic salt content and the total chlorine content in examples 9-10 are reduced, indicating that when the weight ratio of activated carbon and amino carboxylic complexing agent is 30:2-6, the removal efficiency of salt in kitchen waste oil can be further improved.

[0092] Compared with examples 10-11, the inorganic salt content and the total chlorine content in examples 12-15 are reduced, indicating that when the amino carboxylic complexing agent also includes hydroxyethyl imino diacetic acid, and imino diacetic acid and hydroxyethyl imino diacetic acid are loaded on activated carbon together, the removal efficiency of salt in kitchen waste oil can be further improved. In addition, compared with examples 12-13, the inorganic salt content and the total chlorine content in examples 14-15 are reduced, indicating that when the weight ratio of imino diacetic acid and hydroxyethyl imino diacetic acid is 2-5:1, the removal efficiency of salt in kitchen waste oil can be further improved.

[0093] The above merely preferred embodiments of the present application are not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A process for desalting waste cooking oil, characterized in that: The following steps are involved: S1, filtering, crushing, and separating the grease to obtain treated grease; S2, adding water and an auxiliary agent to the treated grease, stirring, and separating the oil and water to obtain desalted grease; The auxiliary agent comprises the following components in parts by weight: 2-15 parts of calcium tartrate, 2-12 parts of diacetone acrylamide, 3-7 parts of sodium bicarbonate, 10-18 parts of organic amine, 2-4 parts of demulsifier, and 15-25 parts of activated carbon; The activated carbon is activated carbon loaded with an aminocarboxylic acid complexing agent, and the raw materials of the activated carbon loaded with an aminocarboxylic acid complexing agent include activated carbon and an aminocarboxylic acid complexing agent; The aminocarboxylic acid complexing agent includes iminodiacetic acid; The aminocarboxylic acid complexing agent also includes hydroxyethyliminodiacetic acid.

2. A process for desalting waste cooking oil according to claim 1, characterized in that: The weight ratio of the calcium tartrate to the diacetone acrylamide is 3-6:

2.

3. The process for desalting waste cooking oil according to claim 1, characterized in that: The weight ratio of the activated carbon to the aminocarboxylic acid complexing agent is 30:2-6.

4. The process for desalting waste cooking oil according to claim 1, characterized in that: The preparation method of the activated carbon loaded with aminocarboxyl complexing agent comprises the following steps: dispersing the aminocarboxyl complexing agent in water, adding the activated carbon, impregnating, and drying to obtain the activated carbon loaded with aminocarboxyl complexing agent.

5. The process for desalting waste cooking oil according to claim 1, characterized in that: The weight ratio of the iminodiacetic acid to the hydroxyethyliminodiacetic acid is 2 to 5:

1.

6. The process for desalting waste cooking oil according to claim 1, characterized in that: The demulsifier includes one or more of fatty alcohol polyoxyethylene ether, octylphenol polyoxyethylene ether, and castor oil polyoxyethylene ether; and the organic amine is one or more of ethanolamine, ethylenediamine, and 2-ethylhexylamine.

7. The process for desalting waste cooking oil according to claim 1, characterized in that: In step S2, the amount of water added is 15% to 30% of the volume of the treated oil; and the mass volume ratio of the auxiliary agent to the treated oil is 3 to 4:2000 in terms of g / mL.

Images