Demulsification lubricating liquid as well as preparation method and application thereof

Abstract

The invention provides an anti-emulsifying lubricating fluid and a preparation method and application thereof, the anti-emulsifying lubricating fluid is composed of polyphosphate which is dipolyphosphate or tripolyphosphate or a mixture of the dipolyphosphate and the tripolyphosphate, and the molecular weight range of the polyphosphate is 234-818. The polyphosphate demulsifying lubricant is prepared through addition polymerization of phosphate and a catalyst under the conditions of heating, normal pressure and stirring, the polyphosphate demulsifying lubricant serves as lubricating grease of a vacuum pump in the phosphate production process, in the process of treating tail gas containing organic alcohol, the demulsifying lubricant for the vacuum pump is not prone to being diluted and emulsified by the organic alcohol, and the service life of the vacuum pump is prolonged. The vacuum pressure of the vacuum pump is not maintained at a high level, the vacuum degree in a phosphate ester production reaction system is stably maintained at a preset value, the stability of production conditions is ensured, the production quality of phosphate ester is ensured, the aging speed of the vacuum pump is remarkably reduced, and the advantages of being simple in technological process, good in vacuum effect and lubricating effect after the vacuum pump is used and low in cost are achieved. And the operation quality of the vacuum pump is obviously improved.

Description

Technical Field

[0001] The present application belongs to the technical field of chemical raw material production, and specifically relates to an anti-emulsification lubricating fluid, a preparation method thereof, and an application thereof. Background Art

[0002] In the prior art, a vacuum pump is a device used to extract gas molecules from a closed space to generate and maintain a vacuum. They play an important role in industrial production and scientific research experiments, and are widely used in metallurgy, chemical industry, food, electronic coating and other industries. Among them, vacuum pump oil plays an important role in the operation of the vacuum pump. It not only lubricates and reduces the wear of the moving parts inside the pump, but is also responsible for sealing to prevent the atmosphere from entering the pump body. It also has the function of cooling and carrying particles generated by wear. Existing vacuum pump oils are usually alkane mineral oils, and their performance directly affects the working efficiency and service life of the vacuum pump. Especially in applications requiring high vacuum, the selection of oil is particularly critical.

[0003] In the prior art, during the production of phosphate esters, the exhaust gas treatment system usually uses a vacuum pump to treat the phosphate ester exhaust gas. During the exhaust gas treatment process, the vacuum oil in the pump head of the vacuum pump is easily emulsified and diluted by the phosphate ester and organic alcohol, so that the vacuum pressure of the vacuum pump is maintained at a high level. The vacuum degree in the phosphate ester production reaction system cannot reach the preset value, thereby reducing the production quality of the phosphate ester. Furthermore, when acid enters the vacuum chamber of the vacuum pump, the emulsification speed of the oil in the vacuum pump is accelerated, which will significantly reduce the aging speed of the vacuum pump. Therefore, improvements are urgently needed. Summary of the invention

[0004] In order to solve the technical problem that a large amount of waste gas containing organic alcohols will be generated in the production process of phosphate esters in the prior art, the vacuum liquid in the existing vacuum pump is usually an alkane mineral oil. When the vacuum pump treats the waste gas containing organic alcohols, the vacuum liquid in the pump head of the vacuum pump is easily emulsified and diluted by the phosphate ester and the organic alcohol, so that the vacuum pressure of the vacuum pump is maintained at a high level for a long time, thereby causing the vacuum degree in the phosphate ester production reaction system to fail to reach a preset value, thereby reducing the production quality of the phosphate ester, and an anti-emulsification lubricating fluid is proposed;

[0005] In order to solve the technical problem proposed by the present application, the present application also provides a method for preparing an anti-emulsification lubricating liquid;

[0006] In order to solve the technical problem raised by the present application, the present application also provides an application of an anti-emulsification lubricating fluid.

[0007] The present application adopts the following scheme, an anti-emulsification lubricating fluid, which is composed of polyphosphate, wherein the structural formula of the polyphosphate is as follows:

[0008]

[0009] The value of n is a positive integer between 2 and 3, and R is any one of a straight chain alkane group, a branched chain alkane group, or an aromatic hydrocarbon group having 1 to 8 carbon atoms.

[0010] In one embodiment, it is any one of dipolyphosphate, trimerized polyphosphate or a mixture of more than one of them, and its molecular weight ranges from 234 to 818.

[0011] In the actual implementation process, the optimal molecular weight of the anti-emulsification lubricant is 459. By controlling the molecular weight of the anti-emulsification lubricant and the chain length of the lubricant, the vacuum boiling point and viscosity can be maintained at a high level. After the vacuum pump has been running for a long time, the lubrication of the vacuum pump can still maintain a normal lubrication level and avoid being emulsified and diluted by organic alcohols in the phosphate production process. This can not only maintain the stability of production conditions, but also improve the operating quality of the vacuum pump and extend its service life.

[0012] In the actual implementation process, the polyphosphate monomers include but are not limited to: di(or mono)methyl phosphate, di(or mono)ethyl phosphate, di(or mono)n-(iso)butyl phosphate, di(or mono)pentyl phosphate, di(or mono)hexyl phosphate, and n-(or iso)di(or mono)octyl phosphate.

[0013] In the actual implementation process, in order to meet the production needs of the phosphate production system and avoid introducing impurities into the production system, R is generally an alkane group with the same number of carbon atoms, that is, a phosphate with the same polymer monomer, that is, the vacuum liquid polymerization monomers of triethyl polyphosphate are diethyl phosphate and monoethyl phosphate, and the use of other phosphates such as diethyl phosphate and dibutyl phosphate for polymerization is avoided.

[0014] In the actual implementation process, the components of the anti-emulsification lubricant include but are not limited to: n-butyl polyphosphate (isobutyl), ethyl polyphosphate, methyl polyphosphate, pentyl polyphosphate, hexyl polyphosphate, and n-octyl polyphosphate (isooctyl).

[0015] In one embodiment, the vacuum boiling point ranges from 250°C to 550°C and the viscosity ranges from 30 mm 2 / s-150mm 2 / s.

[0016] In one embodiment, R is but not limited to -C4H9, -C5H 11 or -C6H 13 Any of .

[0017] In one embodiment, after being stored for 5000h-5500h at 100°C-150°C, 1200rpm-2500rpm, 1800Pa-2500Pa, and with an organic alcohol emulsifier in the liquid system, the vacuum viscosity range is 35mm 2 / s-85mm 2 / s.

[0018] In order to solve the technical problem raised by the present application, the present application also provides a method for preparing an anti-emulsification lubricating liquid, comprising the following steps: putting a phosphate ester and a catalyst into a stirring tank in sequence, reacting at 1000rpm-2000rpm, 80℃-145℃, and normal pressure, monitoring the weight of H2O in the reaction product during the reaction, and when the molar ratio of H2O to phosphate ester is 1:1, the reaction is terminated to obtain the anti-emulsification lubricating liquid.

[0019] In one embodiment, a chemical formula for preparing an anti-emulsification lubricating fluid is as follows:

[0020]

[0021] In one embodiment, the catalyst is any one of a solid-supported Lewis acid catalyst, a solid-supported Lewis base catalyst, and a strong oxidative dehydration catalyst.

[0022] In one embodiment, the catalyst is any one of solid-supported P2O5, solid-supported concentrated H2SO4, and solid-supported NaOH.

[0023] In one embodiment, the catalyst is solid-supported P2O5.

[0024] In order to solve the technical problems raised by the present application, the present application also provides an application of an anti-emulsification lubricating fluid, which is used to replace alkane mineral vacuum oil, and is used as a vacuum liquid of a vacuum pump. The type of the vacuum pump is any one of a piston vacuum pump, a rotary vane vacuum pump, a sliding valve vacuum pump, a trochoid vacuum pump, and a Roots vacuum pump. The model of the vacuum pump is any one of 2X, 2XZ, YZ, YZR, and H.

[0025] In order to solve the technical problem raised in the present application, the present application also provides the vacuum pump for treating tail gas containing organic alcohols in the production process of phosphate esters to maintain the pressure in the pump chamber of the vacuum pump.

[0026] In actual implementation, the vacuum fluid prepared by the present application is suitable for mechanical equipment with medium and heavy loads and medium speeds, such as hydraulic systems, gear boxes, bearings, compressors, and mechanical booster pumps. The vacuum fluid prepared by the present application has excellent high temperature resistance, low volatility, anti-emulsification, stable lubrication and anti-wear properties, and can effectively protect mechanical equipment parts.

[0027] Compared with the prior art, this application has the following beneficial effects:

[0028] The present application provides an anti-emulsification lubricant, a preparation method and application thereof. The anti-emulsification lubricant is composed of polyphosphate, which is a di-polyphosphate or a trimer polyphosphate or a mixture of the two, and has a molecular weight range of 234-818. The polyphosphate anti-emulsification lubricant is prepared by addition polymerization of phosphate and a catalyst under heating, normal pressure and stirring conditions. The anti-emulsification lubricant is used as a grease for a vacuum pump in the production process of phosphate. In the process of treating tail gas containing organic alcohol, the anti-emulsification lubricant for the vacuum pump is not easily diluted and emulsified by the organic alcohol, and the vacuum pressure of the vacuum pump is not maintained at a high level, so that the vacuum degree in the phosphate production reaction system is stably maintained at a preset value, the stability of the production conditions is ensured, the production quality of the phosphate is ensured, and the aging speed of the vacuum pump is significantly reduced. The process flow is simple, and after the vacuum pump is used, the vacuum effect and lubrication effect are good, the vacuum pump has small cavitation, the operation quality of the vacuum pump is significantly improved, and it is easy to promote and implement. DETAILED DESCRIPTION

[0029] In combination with Examples 1-3, the technical solution provided by this application is further explained.

[0030] Example 1

[0031] A method for preparing an anti-emulsification lubricating liquid comprises the following steps:

[0032] Trimethyl phosphate and solid-supported P2O5 catalyst were sequentially placed in a stirred tank, and reacted at 1120 rpm, 95°C, and normal pressure. The weight of H2O in the reaction product was monitored during the reaction. When the molar ratio of H2O to phosphate was 1:1, the reaction was terminated, and an anti-emulsification lubricant A was obtained.

[0033] The vacuum boiling point of the obtained anti-emulsification lubricating fluid A is 267.2°C and its viscosity is 45.8 mm 2 / s.

[0034] The prepared anti-emulsification lubricant A was used to replace ISO-VG-46 vacuum oil and was used in a rotary vane vacuum pump. After the vacuum pump was operated for 5000 hours at 110°C and 1300rpm, the operating temperature of the vacuum pump head was 110°C. The anti-emulsification lubricant A was sampled from the vacuum pump head. There was no emulsification of the anti-emulsification lubricant A, and the liquid level did not decrease significantly. There was no obvious volatilization of the anti-emulsification lubricant A. The system vacuum pressure was 1800Pa. During the operation of the rotary vane vacuum pump, the vacuum pump noise was 60 decibels. The vacuum pump had good operating quality, stable vacuum liquid quality, and still had good cooling and lubricating effects.

[0035] Example 2

[0036] A method for preparing an anti-emulsification lubricating liquid comprises the following steps:

[0037] Tributyl phosphate and solid-supported P2O5 catalyst were sequentially put into a stirred tank and reacted at 1350 rpm, 104° C. and normal pressure. The weight of H2O in the reaction product was monitored during the reaction. When the molar ratio of H2O to phosphate was 1:1, the reaction was terminated to obtain the demulsified lubricant B.

[0038] The vacuum boiling point of the obtained anti-emulsification lubricating fluid B is 332.5°C and its viscosity is 48.8 mm 2 / s.

[0039] The prepared anti-emulsification lubricant B was used to replace ISO-VG-46 vacuum oil and was used in a screw vacuum pump. After the vacuum pump was operated at 125°C and 1750rpm for 5500h, the operating temperature of the vacuum pump head was 120°C. The anti-emulsification lubricant B was sampled from the vacuum pump head. There was no emulsification of the anti-emulsification lubricant B, no obvious decrease in the liquid level, no obvious volatilization of the anti-emulsification lubricant B, and the system vacuum pressure was 1955Pa. During the operation of the screw vacuum pump, the vacuum pump noise was 66 decibels. The vacuum pump had good operating quality, stable vacuum liquid quality, and still had good cooling and lubricating effects.

[0040] Example 3

[0041] A method for preparing an anti-emulsification lubricating liquid comprises the following steps:

[0042] Trioctyl phosphate and solid-supported P2O5 catalyst were sequentially placed in a stirred tank and reacted at 1890 rpm, 137° C. and normal pressure. The weight of H2O in the reaction product was monitored during the reaction. When the molar ratio of H2O to phosphate was 1:1, the reaction was terminated to obtain an anti-emulsification lubricating fluid C.

[0043] The vacuum boiling point of the obtained anti-emulsification lubricating fluid C is 366.4°C and its viscosity is 62.7 mm 2 / s.

[0044] The prepared anti-emulsification lubricant C was used to replace ISO-VG-150 vacuum oil and was used in a screw vacuum pump. After the vacuum pump was operated for 5000 hours at 128°C and 2350rpm, the operating temperature of the vacuum pump head was 120°C. The anti-emulsification lubricant C was sampled from the vacuum pump head. There was no emulsification phenomenon of the anti-emulsification lubricant C, and the liquid level did not decrease significantly. There was no obvious volatilization of the anti-emulsification lubricant C. The system vacuum pressure was 49Pa. During the operation of the screw vacuum pump, the vacuum pump noise was 64 decibels. The vacuum pump had good operating quality, stable vacuum liquid quality, and still had good cooling and lubricating effects.

[0045] Comparative Example 1

[0046] ISO-VG-150 was used as the vacuum oil of the screw vacuum pump of the same model in Example 3. After the vacuum pump was intended to run for 5000 h at 125° C. and 2300 rpm, when the vacuum pump ran to 2300 h, the operating temperature of the vacuum pump head was 155° C., the pump head was overheated, and the operation was stopped. The ISO-VG-150 lubricating fluid was sampled from the vacuum pump head. The ISO-VG-150 lubricating fluid was obviously emulsified, the liquid level was significantly reduced, and the ISO-VG-150 lubricating fluid was volatile. The system vacuum pressure was 120 Pa. During the operation of the screw vacuum pump, the vacuum pump noise was 89 decibels. The vacuum pump had poor operation quality and needed to be stopped for maintenance, the vacuum pump head was cleaned, and the vacuum fluid was replaced.

[0047] It can be seen from Examples 1-3 and Comparative Example 1 that the present application provides an anti-emulsification lubricating liquid, a preparation method thereof and an application thereof, wherein the anti-emulsification lubricating liquid is composed of a polyphosphate ester, which is a dipolyphosphate ester or a trimerized polyphosphate ester or a mixture of the two, and has a molecular weight range of 234-818, and is prepared by addition polymerization of a phosphate ester and a catalyst under heating, normal pressure and stirring conditions;

[0048] As shown in Examples 1-3, it is used as a grease for a vacuum pump in the production process of phosphate ester. In the process of treating tail gas containing organic alcohols, the anti-emulsification lubricant for the vacuum pump is not easily diluted and emulsified by the organic alcohol, and the vacuum pressure of the vacuum pump will not be maintained at a high level, so that the vacuum degree in the phosphate ester production reaction system is stably maintained at a preset value, thereby ensuring the stability of production conditions, ensuring the production quality of phosphate ester, and significantly reducing the aging rate of the vacuum pump. After the vacuum pump has been running stably for 5500 hours, the properties of the vacuum liquid in the vacuum pump are still stable, the operation quality of the vacuum pump is good, and there is no need to replace the vacuum pump oil. The preparation process of the anti-emulsification vacuum liquid is simple. After the vacuum pump is used, the vacuum effect is good, the lubrication effect is good, the vacuum pump cavitation is small, and the operation quality of the vacuum pump is significantly improved, which has the advantage of being easy to promote and implement.

[0049] The above are only embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-emulsification lubricating fluid, characterized in that: It is composed of polyphosphate, wherein the structural formula of polyphosphate is as follows: The value of n is a positive integer between 2 and 3, and R is any one of a straight chain alkane group, a branched chain alkane group, or an aromatic hydrocarbon group having 1 to 8 carbon atoms.

2. The anti-emulsification lubricating fluid according to claim 1, characterized in that: It is any one of dipolyphosphate and trimerized polyphosphate or a mixture of more than one of them, and its molecular weight ranges from 234 to 818.

3. The anti-emulsification lubricating fluid according to claim 1, characterized in that: Its vacuum boiling point ranges from 250℃ to 550℃ and its viscosity ranges from 30mm 2 / s-150mm 2 / s.

4. The anti-emulsification lubricating fluid according to claim 1, characterized in that: in, R is -C4H9, -C5H 11 or -C6H 13 Any of .

5. The anti-emulsification lubricating fluid according to claim 1, characterized in that: After being stored for 5000h-5500h at 100℃-150℃, 1200rpm-2500rpm, 1800Pa-2500Pa, and with an organic alcohol emulsifier in the liquid system, its vacuum viscosity range is 35mm 2 / s-85mm 2 / s.

6. A method for preparing an anti-emulsification lubricating liquid according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: putting a phosphate ester and a catalyst into a stirring kettle in sequence, reacting at 1000 rpm-2000 rpm, 80° C.-145° C. and normal pressure, monitoring the weight of H2O in the reaction product during the reaction, and terminating the reaction when the molar ratio of H2O to the phosphate ester is 1:1 to obtain an anti-emulsification lubricating fluid.

7. The method for preparing an anti-emulsification lubricating liquid according to claim 6, characterized in that: The catalyst is any one of a solid-supported Lewis acid catalyst, a solid-supported Lewis base catalyst and a strong oxidative dehydration catalyst.

8. The method for preparing an anti-emulsification lubricating liquid according to claim 6, characterized in that: The catalyst is any one of solid-supported P2O5, solid-supported concentrated H2SO4, and solid-supported NaOH.

9. An application of an anti-emulsification lubricating fluid, characterized in that: It is used to replace alkane mineral vacuum oil and is used as vacuum liquid of a vacuum pump. The type of the vacuum pump is any one of a piston vacuum pump, a rotary vane vacuum pump, a sliding valve vacuum pump, a trochoid vacuum pump, and a Roots vacuum pump. The model of the vacuum pump is any one of 2X, 2XZ, YZ, YZR, and H.

10. The use of an anti-emulsification lubricating fluid according to claim 9, characterized in that: The vacuum pump is used to process tail gas containing organic alcohols during the production of phosphate esters to maintain the pressure in the pump cavity of the vacuum pump.

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