A nonionic polyether demulsifier, its preparation method and application

Abstract

The application provides a non-ionic polyether demulsifier and a preparation method and application thereof, and belongs to the technical field of demulsifiers.The non-ionic polyether demulsifier comprises the following components in mass fraction: 25-45 parts of a non-ionic surfactant, 0.1-5 parts of a dispersant, 35-55 parts of a cosolvent and 0.1-1 parts of an antioxidant.The addition of the non-ionic surfactant, the dispersant and the cosolvent in the application can help to reduce the oil-water interfacial tension, promote oil-water separation, shorten the demulsification time and improve the demulsification efficiency, can play the excellent demulsification performance of the application under more extensive conditions, and reduce the adverse effects of emulsions on equipment;the addition of the antioxidant can maintain its original performance for a long time, prevent performance reduction caused by oxidation, is beneficial to inventory management and long-term use, and ensures the effectiveness and reliability in actual application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of demulsifiers, in particular to a non-ionic polyether demulsifier and a preparation method and application thereof. BACKGROUND

[0002] Lubricating oil plays a crucial role in industrial production, as it not only reduces frictional wear between mechanical equipment, improving equipment efficiency, but also extends the service life of equipment. However, in actual application, due to the influence of external environment and the shearing force brought by equipment mechanical operation, lubricating oil often mixes with water to form emulsions, reducing lubricating performance and increasing wear risk, and may cause corrosion and other problems, thereby affecting the normal operation of equipment and reducing the service life. Therefore, effectively solving the emulsification problem in lubricating oil is the key to maintaining stable operation of equipment.

[0003] Adding anti-emulsifiers is considered a simple and effective means to enhance the demulsification ability of lubricating oil. Among them, non-ionic polyether demulsifiers exhibit excellent performance in breaking oil-water emulsions due to their good water solubility and surface activity. Such demulsifiers achieve demulsification effects by reducing oil-water interfacial tension, changing the charge state of emulsified particles, and promoting oil-water separation. In addition, non-ionic polyether demulsifiers are not easily affected by water hardness and pH changes, and can maintain stable demulsification ability under various working conditions, and are widely used in oil exploration, refining and processing, etc.

[0004] The existing non-ionic polyether demulsifiers have the problem of long demulsification time. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a non-ionic polyether demulsifier and a preparation method and application thereof. The non-ionic polyether demulsifier of the present application has short demulsification time and good demulsification effect.

[0006] In order to achieve the above-mentioned purpose of the application, the present application provides the following technical solutions:

[0007] The present application provides a non-ionic polyether demulsifier, which comprises the following components in mass fraction: non-ionic surfactant 25-45 parts, dispersant 0.1-5 parts, cosolvent 35-55 parts and antioxidant 0.1-1 parts.

[0008] Preferably, the mass fraction of non-ionic surfactant in the non-ionic polyether demulsifier is 30-40 parts.

[0009] Preferably, the nonionic surfactant includes one or more of polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitan monofatty acid ester, polyoxyethylene-polyoxypropylene block copolymer, polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer, ethylene oxide-propylene oxide block copolymer and polyether modified silicone block copolymer.

[0010] Preferably, the mass fraction of the dispersant in the nonionic polyether demulsifier is 0.2 to 3 parts.

[0011] Preferably, the dispersant comprises one or more of polyisobutylene succinic anhydride, polyetheramine, phosphate ester and polyethyleneimine.

[0012] Preferably, the mass fraction of the cosolvent in the nonionic polyether demulsifier is 40 to 50 parts.

[0013] Preferably, the co-solvent comprises one or more of ethyl acetate, glycol ether, toluene, xylene, propylene glycol and ethylene oxide-propylene oxide mixture.

[0014] Preferably, the mass fraction of the antioxidant in the nonionic polyether demulsifier is 0.3 to 0.5 parts.

[0015] The present invention also provides a method for preparing the nonionic polyether demulsifier described in the above technical solution, comprising the following steps:

[0016] The nonionic surfactant, dispersant, cosolvent and antioxidant are mixed to obtain the nonionic polyether demulsifier.

[0017] The present invention also provides the use of the nonionic polyether demulsifier described in the above technical solution in the field of lubrication.

[0018] The invention provides a nonionic polyether demulsifier, which comprises the following components in parts by mass: 25 to 45 parts of a nonionic surfactant, 0.1 to 5 parts of a dispersant, 35 to 55 parts of a cosolvent and 0.1 to 1 part of an antioxidant.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The addition of nonionic surfactants, dispersants and cosolvents in the present invention can help reduce the oil-water interfacial tension and promote oil-water separation, showing significant advantages in demulsification time, fast demulsification speed, shortened demulsification time, improved demulsification efficiency, and can play the excellent demulsification performance of the present invention under a wider range of conditions, reducing the adverse effects of the emulsion on the equipment; the addition of antioxidants can maintain its original performance for a long time, prevent the performance degradation caused by oxidation, facilitate inventory management and long-term use, and ensure its effectiveness and reliability in practical applications; at the same time, the nonionic polyether demulsifier of the present invention can change the properties of the emulsion membrane by specifically limiting the composition of the raw materials, making it more fragile. The rupture of the emulsion membrane will cause the separation of oil droplets and water droplets, thereby achieving effective demulsification. By destroying the emulsion membrane, the demulsifier can prevent the oil droplets from being redispersed into the water, can clearly separate the oil and water, and ensure that the separated oil is pure and reusable. The present invention improves the lubricating performance of the lubricating oil by optimizing the composition and ratio of the demulsifier, reduces the friction damage of the fasteners, and extends the service life of the parts.

[0021] Furthermore, the components of the present invention can be decomposed by microorganisms into harmless substances, such as water and carbon dioxide, in the natural environment, reducing their accumulation in the environment and lowering the risk of long-term impact on the ecosystem; each component has a high solubility in water and does not contain heavy metals or other harmful substances, so it has low toxicity to aquatic organisms and soil microorganisms; it is relatively safe during use and poses a low health risk to operators, meeting the current high requirements for sustainable development and environmental protection.

[0022] The present invention also provides a method for preparing the nonionic polyether demulsifier described in the above technical solution. The nonionic polyether demulsifier of the present invention has mild production conditions, significant demulsification effect, and can maintain excellent demulsification performance even after multiple uses. DETAILED DESCRIPTION

[0023] The present invention provides a nonionic polyether demulsifier, which comprises the following components in parts by mass: 25 to 45 parts of a nonionic surfactant, 0.1 to 5 parts of a dispersant, 35 to 55 parts of a cosolvent and 0.1 to 1 part of an antioxidant.

[0024] In the present invention, unless otherwise specified, the raw materials used are commercially available products in the art.

[0025] In the present invention, the mass fraction of the nonionic surfactant in the nonionic polyether demulsifier is preferably 30 to 40 parts, specifically 25, 30, 35, 40 or 45 parts.

[0026] In the present invention, the nonionic surfactant preferably includes one or more of polyoxyethylene sorbitan fatty acid ester, polyoxyethylene anhydrous sorbitan monofatty acid ester, polyoxyethylene-polyoxypropylene block copolymer, polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer, ethylene oxide-propylene oxide block copolymer and polyether modified silicone block copolymer, more preferably ethylene oxide-propylene oxide block copolymer; the nonionic surfactant can significantly reduce the tension of the oil-water interface, thereby making it easier for the oil droplets to merge and settle. During the demulsification process, the nonionic surfactant can be adsorbed on the surface of the emulsified particles, affecting the re-aggregation between the particles, preventing the oil and water from re-emulsifying, that is, preventing the separated oil droplets from being redispersed in the water to form a new emulsion, thereby ensuring the continuity and stability of the demulsification effect. The nonionic surfactant usually has good stability to changes in pH and temperature, so it can maintain its demulsification performance under different conditions and is suitable for a variety of working conditions.

[0027] In a specific embodiment of the present invention, the ethylene oxide-propylene oxide block copolymer is preferably poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol), which is purchased from Aladdin with a product model of F-68 (average Mn ~8,400 (EO:PO=4:1)).

[0028] Based on the mass fraction of the nonionic surfactant, the mass fraction of the dispersant in the nonionic polyether demulsifier is preferably 0.2 to 3 parts, specifically 0.1, 0.2, 1, 3 or 5 parts.

[0029] In the present invention, the dispersant preferably includes one or more of polyisobutylene succinic anhydride, polyetheramine, phosphate ester and polyethyleneimine; the dispersant can combine with pollutants (including dust, metal dust and oil stains) in the lubricating oil to form easily separable compounds, prevent their deposition, and improve the cleanliness of the lubricating oil.

[0030] Based on the mass fraction of the nonionic surfactant, the mass fraction of the cosolvent in the nonionic polyether demulsifier is preferably 40 to 50 parts, specifically 35, 40, 45, 50 or 55 parts.

[0031] In the present invention, the cosolvent preferably includes one or more of ethyl acetate, ethylene glycol ether, toluene, xylene, propylene glycol and ethylene oxide-propylene oxide mixture, more preferably a mixture of toluene and xylene, and the mass ratio of toluene and xylene in the mixture of toluene and xylene is preferably 20:25; the role of the cosolvent is to improve the solubility of the demulsifier, increase the solubility of the aqueous phase in the oil-water mixture, help the demulsifier to be better dispersed in the oil phase, and promote the aggregation of oil droplets and oil-water separation.

[0032] In the present application, the mass ratio of ethylene oxide to propylene oxide in the ethylene oxide-propylene oxide mixture is preferably 1-3:1-3, and can be 1:1, 2:1, 1:2, 3:1 and 1:3.

[0033] The mass fraction of the antioxidant in the non-ionic polyether demulsifier is preferably 0.3-0.5 parts based on the mass fraction of the non-ionic surfactant, and can be 0.1, 0.3, 0.5 or 1 part.

[0034] In the present application, the antioxidant preferably includes one or more of 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butyl phenol, N,N'-di-sec-butyl-p-phenylenediamine and dilauryl thiodipropionate; the antioxidant can interrupt the oxidation chain reaction in the demulsifier, decompose peroxide, protect the demulsifier from oxidation during storage, and maintain its performance stability.

[0035] The present application also provides a preparation method of the non-ionic polyether demulsifier described in the above technical solution, comprising the following steps:

[0036] The non-ionic surfactant, dispersant, cosolvent and antioxidant are mixed to obtain the non-ionic polyether demulsifier.

[0037] The present application does not have special limitations on the specific manner of mixing, and the manner well known to those skilled in the art can be used.

[0038] In a specific embodiment of the present application, the non-ionic surfactant and the dispersant are first mixed to obtain a first mixture; the first mixture is second mixed with the cosolvent and the antioxidant to obtain a second mixture; the second mixture is continuously stirred for 1 h to obtain the non-ionic polyether demulsifier.

[0039] In the present application, the first mixing is preferably carried out under stirring. The present application does not have special limitations on the time and speed of stirring, and the mixture is uniformly mixed using the well-known scheme to those skilled in the art.

[0040] After obtaining the first mixture, the present application second mixes the first mixture with the cosolvent and the antioxidant to obtain a second mixture.

[0041] In the present application, the second mixing is preferably carried out under stirring. The present application does not have special limitations on the time and speed of stirring, and the mixture is uniformly mixed using the well-known scheme to those skilled in the art.

[0042] After obtaining the second mixture, the second mixture is continuously stirred for 1 hour to obtain the nonionic polyether demulsifier. The present invention has no particular limitation on the stirring time and speed, and a method well known to those skilled in the art can be used to mix the mixture uniformly.

[0043] The present invention also provides the use of the nonionic polyether demulsifier described in the above technical solution in the field of lubrication.

[0044] The present invention has no particular limitation on the specific manner of the application, and any manner familiar to those skilled in the art may be used.

[0045] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] Raw materials used in the examples:

[0047] Ethylene oxide-propylene oxide block copolymer was purchased from Aladdin, the product model is F-68 (average Mn ~8,400 (EO:PO=4:1)).

[0048] Example 1

[0049] Prepare non-ionic polyether demulsifier according to the mass fraction of each component:

[0050] Weigh 40 parts of ethylene oxide-propylene oxide block copolymer, 45 parts of toluene, 0.2 parts of phosphate ester, and 0.5 parts of N,N'-di-sec-butyl-p-phenylenediamine.

[0051] Add polyoxyethylene-polyoxypropylene block copolymer and phosphate to a container and stir until the components are uniformly mixed at a stirring rate of 400 r / min; add toluene and N,N'-di-sec-butyl-p-phenylenediamine and continue stirring the mixture at a stirring rate of 400 r / min. After thorough mixing, continue stirring for 1 hour to obtain a nonionic polyether demulsifier.

[0052] Example 2

[0053] Prepare non-ionic polyether demulsifier according to the mass fraction of each component:

[0054] Weigh 40 parts of ethylene oxide-propylene oxide block copolymer, 45 parts of xylene, 0.2 parts of phosphate ester, and 0.5 parts of N,N'-di-sec-butyl-p-phenylenediamine.

[0055] The preparation process is the same as that in Example 1.

[0056] Example 3

[0057] Prepare non-ionic polyether demulsifier according to the mass fraction of each component:

[0058] Weigh 40 parts of ethylene oxide-propylene oxide block copolymer, 20 parts of toluene, 25 parts of xylene, 0.2 parts of phosphate ester, and 0.5 parts of N,N'-di-sec-butyl-p-phenylenediamine.

[0059] The preparation process is the same as that in Example 1.

[0060] Example 4

[0061] Prepare non-ionic polyether demulsifier according to the mass fraction of each component:

[0062] Weigh 25 parts of ethylene oxide-propylene oxide block copolymer, 35 parts of toluene, 1 part of phosphate ester, and 1 part of N,N'-di-sec-butyl-p-phenylenediamine.

[0063] The preparation process is the same as that in Example 1.

[0064] Example 5

[0065] Prepare non-ionic polyether demulsifier according to the mass fraction of each component:

[0066] Weigh 25 parts of ethylene oxide-propylene oxide block copolymer, 35 parts of xylene, 3 parts of phosphate ester, and 1 part of N,N'-di-sec-butyl-p-phenylenediamine.

[0067] The preparation process is the same as that in Example 1.

[0068] Performance testing methods

[0069] Two groups of experiments were designed based on the national standard GB_T 7605-2008 for demulsification performance. The first group of experiments was conducted in accordance with the national standard GB_T 7605-2008, and the demulsification performance of the samples was tested three times in a row. The second group of experiments was conducted on the basis of the national standard GB_T7605-2008, and the oil-water ratio (volume ratio) was changed from 1:1 to 3:1, 5:1 and 7:1 to test the demulsification performance of the demulsifier under different oil-water ratio conditions. Demulsifiers P1 and P2 were selected for comparative experiments with the demulsifiers prepared in Examples 1 to 5 of the present invention. Among them, P1, P2 and base oil were commercially available. The experiment selected 150N base oil with a kinematic viscosity of 150cSt, and the addition amount of each demulsifier was 0.3% of the base oil mass. The demulsification performance was studied using the above two groups of demulsification experiments, and the results are shown in Tables 1 and 2.

[0070] The results are analyzed as follows:

[0071] 1. As can be seen from Table 1, in terms of demulsification time, when no component is added to the base oil, the demulsification time is 15 to 20 minutes. After the demulsifiers of Examples 1 to 5 are added, the demulsification time is reduced to 7 to 14 minutes. The demulsification time is significantly reduced, indicating that a better demulsification effect is achieved.

[0072] After the commercially available demulsifiers P1 and P2 were added, the demulsification time of the stirring method was 13 to 19 minutes and 15 to 22 minutes, respectively. The demulsification time did not change significantly, and even increased compared with the demulsification time of the base oil, indicating that the demulsification effect was general. Among them, the demulsification time of Example 3 was shorter than that of Examples 1 and 2, indicating that the demulsifier prepared from the xylene-toluene mixture was better than the demulsifier prepared from single toluene (xylene).

[0073] In addition, the demulsification time of Examples 1 to 5 was shortened after continuous experiments, and the demulsification effect of the sample with commercial demulsifier P1 was significantly weakened after continuous experiments, indicating that Examples 1 to 3 have good continuous demulsification capabilities.

[0074] 2. As shown in Table 2, in terms of demulsification time at different water-oil ratios, when no components are added to the base oil, the demulsification time is 16-20 minutes. After adding the demulsifiers of Examples 1-5, the demulsification time is 10-13 minutes, which is significantly reduced, indicating a good demulsification effect. After adding the commercially available demulsifiers P1 and P2, the demulsification time is 13-16 minutes and 15-20 minutes, respectively. This further proves that Examples 1-3 are more excellent in shortening the demulsification time and can show better demulsification effect in different oil-water environments.

[0075] Table 1 Continuous demulsification test results

[0076]

[0077] Table 2 Demulsification test results at different oil-water ratios

[0078]

[0079]

[0080] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation thereto. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications shall also be considered within the scope of protection of the present invention.

Claims

1. A nonionic polyether demulsifier, characterized in that: The invention comprises the following components in parts by weight: 25-45 parts of a nonionic surfactant, 0.1-5 parts of a dispersant, 35-55 parts of a cosolvent and 0.1-1 parts of an antioxidant; the dispersant is a phosphate ester; The nonionic surfactant includes one or more of polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitan monofatty acid ester, polyoxyethylene-polyoxypropylene block copolymer, polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer, ethylene oxide-propylene oxide block copolymer and polyether modified silicone block copolymer; The cosolvent is a mixture of toluene and xylene.

2. The nonionic polyether demulsifier according to claim 1, characterized in that The mass fraction of the nonionic surfactant in the nonionic polyether demulsifier is 30 to 40 parts.

3. The nonionic polyether demulsifier according to claim 1, characterized in that The mass fraction of the dispersant in the nonionic polyether demulsifier is 0.2 to 3 parts.

4. The nonionic polyether demulsifier according to claim 1, characterized in that The mass fraction of the cosolvent in the nonionic polyether demulsifier is 40 to 50 parts.

5. The nonionic polyether demulsifier according to claim 1, characterized in that The mass fraction of the antioxidant in the nonionic polyether demulsifier is 0.3 to 0.5 parts.

6. The method for preparing the nonionic polyether demulsifier according to any one of claims 1 to 5, characterized in that: The following steps are involved: The nonionic surfactant, dispersant, cosolvent and antioxidant are mixed to obtain the nonionic polyether demulsifier.

7. Use of the nonionic polyether demulsifier according to any one of claims 1 to 5 in the field of lubrication.

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