CN112226263B - High-density low-condensation-point sealing oil composition special for gas holder - Google Patents
High-density low-condensation-point sealing oil composition special for gas holder Download PDFInfo
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- CN112226263B CN112226263B CN202011115780.6A CN202011115780A CN112226263B CN 112226263 B CN112226263 B CN 112226263B CN 202011115780 A CN202011115780 A CN 202011115780A CN 112226263 B CN112226263 B CN 112226263B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
- C10M169/048—Mixtures of base-materials and additives the additives being a mixture of compounds of unknown or incompletely defined constitution, non-macromolecular and macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/106—Naphthenic fractions
- C10M2203/1065—Naphthenic fractions used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
- C10M2205/026—Butene
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/16—Paraffin waxes; Petrolatum, e.g. slack wax
- C10M2205/163—Paraffin waxes; Petrolatum, e.g. slack wax used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
- C10M2209/084—Acrylate; Methacrylate
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/105—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/08—Amides
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/22—Heterocyclic nitrogen compounds
- C10M2215/223—Five-membered rings containing nitrogen and carbon only
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2217/04—Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2217/041—Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds involving a condensation reaction
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
- Sealing Material Composition (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a special sealing oil composition with high density and low condensation point for a gas holder, which is characterized in that the density of the sealing oil composition is 880kg/m3The solidifying point is lower than-38 ℃, the components of the sealing oil composition comprise base oil and additives, and the base oil is a mixture of paraffin base oil and naphthenic base oil; the additive comprises pour point depressant, and the invention has the advantages that the N14B and the-20 ℃ general transformer oil are combined and mixed, and the self-pour point depression phenomenon is generated when two base oil products are mixed; on the basis of carrying out combined mixing and self-pour-point depressing on N14B and general transformer oil at the temperature of-20 ℃, the excellent pour-point depressing effect is further obtained, so that the low pour point at the temperature of-50 ℃ is unexpectedly obtained, and the sealing oil composition which is suitable for the requirements of proper viscosity and viscosity-temperature characteristics, higher oil density, lower pour point and good anti-emulsifying water diversion performance of the sealing oil of the dry type gas holder is obtained through pour-point depressing of polymethacrylate, polyacrylate and polymethacrylate.
Description
The technical field is as follows:
the invention belongs to the technical field of lubricating oil compositions, and particularly relates to a special sealing oil composition for a high-density low-freezing-point gas holder.
Background art:
the dry-type gas holder sealing oil is a medium for sealing the gas holder, mainly plays a role in sealing gas and lubricating a piston, and ensures that a system is in efficient and stable operation. The dry gas holder is one of gas storage holders, is used for storing various fuel gases, and is developed towards high pressure and large scale in order to meet the requirements of storage pressure and storage volume, the storage pressure can reach 23kPa or even higher, and the volume can reach 30 ten thousand m3Even larger, this places more stringent requirements on the gas holder seal oil. The dry gas holder is mainly used for collecting, storing and burning gas and the likeThe gas cabinet is generally cylindrical or polygonal in shape, and a piston plate which can move up and down and has the same diameter as the cabinet body is arranged in the gas cabinet and used for adjusting and keeping constant the gas pressure in the cabinet body. Liquid is used as a sealing medium between the edge of the piston and the wall of the gas holder, and dry gas holder sealing oil is used as a medium for sealing the gas holder.
From the 20 th century and the 80 th century, with the improvement of manufacturing technology and construction level, the dry gas holder is generally applied in China and plays a leading role in the gas transportation and distribution process. In response to the requirements of energy conservation and environmental protection, more and more enterprises collect the generated combustible gas for heat supply or power generation, and for civil use, the coal gas is also widely used as a convenient and clean fuel as natural gas, so that gas cabinets are increasingly adopted by industries such as steel, coking, gas and the like, the volume of the gas cabinets is also increasingly large, and the volume of the gas cabinets reaches 30 ten thousand meters at present3The application of gas holder sealing oil is also developed, and the gas holder sealing oil becomes one of the main industrial oils. For dry gas cabinets, the correct choice of sealing oil is the key to ensure the safe and normal operation of the gas cabinet.
Therefore, in daily production work, the used dry type gas holder sealing oil is required to have the following performance index requirements:
(1) suitable viscosity and viscosity-temperature characteristics: according to the design requirements of different dry gas cabinets, gas cabinet sealing oil with suitable viscosity is selected, and the gas cabinet piston is ensured to be kept in a lubricating working state all the time in working. The good viscosity-temperature performance ensures that the gas holder sealing oil still keeps proper kinematic viscosity, good lubricity and fluidity when being used in regions with large temperature difference (such as Xinjiang, inner covering and the like, and also puts forward the requirement of low-temperature fluidity).
(2) Higher oil density: in the design of the dry gas holder, the oil layer height of the dry gas holder sealing oil is calculated according to the gas storage pressure set by the whole gas holder and the density of the dry gas holder sealing oil, the oil layer pressure of the dry gas holder sealing oil needs to be greater than the gas storage pressure to meet the sealing requirement, so the density of the dry gas holder sealing oil at 20 ℃ is generally required to be 880-920kg/m due to the design requirement of the dry gas holder and the consideration of user safety3. But for mineralsThe oil, whether it is normally refined or hydrotreated, is mostly at 860kg/m3The small part can reach 890-910 kg/m3The mineral oil has a close relationship with the composition, the density of the aromatic hydrocarbon is the largest, the density of the naphthenic hydrocarbon is the next lowest, and the density of the alkane is the smallest, and the aromatic hydrocarbon is a non-ideal component, which affects the service life and the performance of the oil product, so that comprehensive consideration is needed to screen proper base oil.
(3) Lower freezing point: with the wider application area of the dry gas holder, the difference of the climate conditions is larger and larger, and higher requirements are provided for the low-temperature performance of the oil product, for example, in Xinjiang, inner Mongolia, Liaoning and other places, the condensation point requirements of the gas holder sealing oil reach below-38 ℃, even below-40 ℃, even the low-temperature kinematic viscosity of the oil product also provides more severe requirements, namely, the dry gas holder can still work in the severe cold environment in order to ensure the low-temperature fluidity of the oil product. The condensation point of the oil product is determined by the base oil to a great extent, almost all paraffin-based mineral base oil contains a small amount of wax, and as the temperature of the oil product decreases, a waxy component in the oil is crystallized and separated out, and gradually grows into a three-dimensional network structure from small crystals, so that the oil product is difficult to flow until reaching a solidification state, namely structural solidification; there are also some wax-free base oils whose freezing point is limited by viscosity, and as the temperature is continuously reduced, the kinematic viscosity of the oil product gradually increases and the fluidity deteriorates until the whole oil solidifies, which is viscosity-temperature solidification. When the oil product contains the pour point depressant, molecules of the pour point depressant are adsorbed or eutectic on the surface of the wax to act on the production direction and the shape of wax crystals, the crystallization mode of the wax is changed, the wax crystals are separated by the main chain of the pour point depressant to generate the steric hindrance effect, and the wax crystals can not form a three-dimensional structure which can block the flow any more, so that the effects of improving the low-temperature flow property of the oil product and reducing the condensation point are achieved.
(4) Excellent corrosion resistance and rust resistance: the dry gas holder sealing oil needs to have excellent steel corrosion protection capability, and H exists in the gas composition of the gas holder2S and other acidic gases are easy to rust metal parts in the gas holder, so that the gas holder sealing oil is required to show excellent performance in the using processGood corrosion resistance and rust resistance.
(5) Good anti-emulsifying water-separating property: dry-type gas holder sealing oil is in the use, participate in the circulation flow of oil in the gas holder, fluid can take place the contact with the water bed course at the bottom of the cupboard and the gaseous in the cabinet body, form the oil water mixture, if can not be with the effectual separation of moisture in the specified time, along with the increase of time, fluid can be emulsified gradually, and the rust-resistant corrosion resistance of fluid after the emulsification can descend thereupon, lead to freezing to lead to the piston to turn on one's side easily winter simultaneously, and then influence the gas holder and normally work.
In summary, with the development and application of gas holder technology, the complexity of gas component storage, the wide application area, and the more severe and complicated actual operation conditions of the dry gas holder, the higher requirements for the performance of the oil product are provided, and a new gas holder sealing oil product with higher density, lower condensation point and good low-temperature fluidity is needed to be matched with the gas holder sealing oil product.
The invention content is as follows:
in order to solve the problems and overcome the defects of the prior art, the invention provides the special sealing oil composition for the gas holder, which has high density, good water distribution performance and low condensation point and meets the lubricating requirement of the dry gas holder technology.
The specific technical scheme for solving the technical problems comprises the following steps: a high density, low freezing point sealing oil composition, characterized in that said sealing oil composition has a density of 880kg/m3Above, the condensation point is lower than minus 38 ℃,
the components of the sealing oil composition comprise base oil and additives,
the base oil is a mixture of paraffin base oil and naphthenic base oil;
the additive includes a pour point depressant.
Further, the additive also comprises a metal deactivator, an antirust agent, a demulsifier, a pour point depressant and a viscosity index improver.
Furthermore, the viscosity of the paraffin-based base oil is different from that of the naphthenic base oil, the paraffin-based base oil is API I and II type hydrofined base oil, and the naphthenic base oil is naphthenic hydrofined base oil.
Further, the paraffinic base oil is 150BS or N14B or 120 BS; the naphthenic base oil is general transformer oil or N4010.
Further, the metal deactivator is benzotriazole and derivatives thereof, thiadiazole and derivatives thereof, and the content of the metal deactivator is 0.01-1.5%.
Furthermore, the antirust agent is barium dinonyl naphthalene sulfonate, alkyl phosphate imidazoline salt, N-oleoyl sarcosine octadecylamine and oleamide, and the content is 0.01-1.0%.
Further, the demulsifier is a condensation product of amine and epoxide, ethanedioic acid ester, and a copolymer of propylene oxide and ethylene oxide; the content is 5-500 ppm.
Furthermore, the pour point depressant is a mixture of two or more than two of alkyl naphthalene, polymethacrylate, polyacrylate, polyalphaolefin or alkyl polystyrene, and the content of the pour point depressant is 1-10%.
Further, the viscosity index improver is polyisobutylene or ethylene propylene copolymer or polymethacrylate or styrene diene copolymer, and the content is 1-10%.
The invention has the beneficial effects that:
(1) the N14B and the-20 ℃ general transformer oil are combined and mixed, and when two base oil products are mixed, the self-pour-point depression phenomenon is generated;
(2) the polymethacrylate, the polyacrylate and the polymethacrylate can have excellent pour point depressing effect on base oil mixed by N14B and general transformer oil at the temperature of-20 ℃, so that the excellent pour point depressing effect can be further obtained on the basis of the combined mixing and self-pour point depressing of the general transformer oil at the temperature of N14B and the general transformer oil at the temperature of-20 ℃, and a low-temperature fluidity requirement is also provided when the sealing oil of the gas holder is used in regions with large temperature difference (such as Xinjiang, inner Mongolia and the like), and the proper kinematic viscosity, the good lubricity and the fluidity are still maintained;
(3) the sealing oil composition which is suitable for the requirements of proper viscosity and viscosity-temperature characteristics, higher oil density, lower condensation point and good anti-emulsifying water diversion performance of the dry type gas holder sealing oil is obtained by combining and mixing N14B and general transformer oil at the temperature of-20 ℃ and performing pour point depression on polymethacrylate, polyacrylate and polymethacrylate.
The specific implementation mode is as follows:
in the description of the invention, specific details are given only to enable a full understanding of the embodiments of the invention, but it should be understood by those skilled in the art that the invention is not limited to these details for the implementation. In other instances, well-known structures and functions have not been shown or described in detail to avoid obscuring aspects of embodiments of the invention. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The specific implementation mode of the invention is as follows:
specific examples of the present invention are given below. The specific examples are only intended to illustrate the invention in further detail and do not limit the scope of protection of the claims of the present application.
Example 1
Adding the following components into a blending kettle with stirring and heating functions, and stirring for 2-5h at 50-70 ℃ to blend the special sealing oil composition for the gas holder, wherein the component ratio is as follows:
example 2
Adding the following components into a blending kettle with stirring and heating functions, and stirring for 2-5h at 50-70 ℃ to blend the special sealing oil composition for the gas holder, wherein the component ratio is as follows:
example 3
Adding the following components into a blending kettle with stirring and heating functions, and stirring for 2-5h at 50-70 ℃ to blend the special sealing oil composition for the gas holder, wherein the component ratio is as follows:
the results of the comparative analyses of examples 1-3 with the major competitive products on the market are shown in Table 1.
Table 1 gas holder seal oil composition examples 1-3 and the results of the evaluation of the main properties of the major competitive products in the existing market
The performance evaluation data in table 1 show that the gas holder sealing oil composition provided by the embodiment of the present application is relatively good in main performance compared with the oil products of the main competitive products in the existing market, and has a significant advantage in low-temperature performance, specifically, the gas holder sealing oil composition provided by the present application has a relatively low condensation point, can approach or even reach a low temperature of-50 ℃, and meets the requirements of various extremely cold regions; the gas holder sealing oil composition provided by the embodiment of the application has excellent anti-emulsification performance, can separate oil and water quickly, can not cause the wall of a cabinet to freeze when used in a severe cold area, and ensures the normal operation of a gas holder.
The present invention will be further described with reference to the following examples;
the preparation method of the gas holder sealing oil composition comprises the steps of adding the components into a blending kettle with stirring and heating functions, stirring for 2-3.5 hours at 50-70 ℃ for blending, wherein the components specifically comprise:
two or more than two naphthenic hydrorefined base oils and paraffin-based hydrorefined base oils are preferred in the invention;
due to the high density limit of the gas tank sealing oil, the selection is at 880-920kg/m3Different paraffin base oil and naphthenic base oil are combined and mixed, and the low freezing point combination of the mixed oil product is searched;
TABLE 2 pour Point test index for different base oil formulations in gasholder seal oil compositions
According to the data analysis of table 2, it can be seen that:
due to the high density limit of the gas tank sealing oil, the selection is at 880-920kg/m3The paraffin-based base oil and the naphthenic base oil are combined and mixed, and the paraffin-based base oil and the naphthenic base oil which are combined have the self-pour point depression phenomenon, and particularly the pour point of N14B can be reduced to-42 ℃ when the paraffin-based base oil and the naphthenic base oil are mixed with general transformer oil at the temperature of-20 ℃ to be at the same viscosity.
In order to more intuitively show the advantages of the pour point depressant compounding process, the pour point depressant compounding process is further described by combining the embodiment;
TABLE 3 detection index of pour point for different base oil formulations and pour point depressant compounding in gas holder sealing oil composition
According to the data analysis in the table 3, the following results are obtained: paraffin base oil and naphthenic base oil are combined and mixed, specifically N14B and common transformer oil at the temperature of-20 ℃ are mixed to be the same in viscosity, and the pour point depressant is creatively found: polymethacrylate + polyacrylate and pour point depressant polymethacrylate,
in order to more intuitively show the advantages of different base oil formulas and the compounding process of the pour point depressant,
comparative example one: the preparation method is the same as the embodiment except that: in the preparation process of the comparative example, the base oil was only paraffin-based base oil N14B, and the pour point was determined in combination with different pour point depressants, as shown in Table 4;
comparative example two: the preparation method is the same as the embodiment except that: in the preparation process of the comparative example, the base oil is only naphthenic base oil general transformer oil, and the condensation point is determined by combining different pour point depressants, which is shown in table 5;
TABLE 4N 14 index for pour point test as a combination of base oil and pour point depressant
TABLE 5 general Transformer oil and pour point depressant compounding set point detection index
As can be seen from the data analysis in Table 4, when the base oil is only paraffin base oil N14B, the base oil has no condensation point self-decreasing effect; in various pour point depressants and pour point depressant combinations, except for alkyl naphthalene, the sealing oil composition with the base oil of paraffin base oil N14B has a certain pour point depressing effect, but the pour point depressing effect is not very different and is not obvious;
in particular, the base oil is only paraffin base oil N14B, and the kinematic viscosity at 50 ℃ is far beyond the kinematic viscosity at 50 ℃ and the floating range is 52-59mm/s2Although the condensation point can meet the requirement, the kinematic viscosity and the viscosity index at 50 ℃ both far exceed the use requirement of the dry gas holder sealing oil, the viscosity index is far lower than 100,
when the gas holder sealing oil is used in regions with large temperature difference (such as Xinjiang, inner Mongolia and the like, the requirement of low-temperature fluidity is also provided), the proper kinematic viscosity, the good lubricity and the good fluidity can still be maintained;
from the data analysis in Table 5, it can be seen that the floating range of kinematic viscosity at 50 ℃ is as follows when the base oil is only paraffin base oil N14B30.9mm/s2The floating range of kinematic viscosity at the temperature of lower than 50 ℃ is 52-59mm/s2The condensation point of the base oil is-39 ℃, and no condensation point self-reduction effect exists; the pour point depressant has no obvious pour point depression effect in various pour point depressants and pour point depressant combinations;
TABLE 6 demulsification detection index of different base oil formulas and demulsifier compounding in gasometer sealing oil composition
From the data analysis in table 6, it can be seen that: the general transformer oil with the temperature of N14B and minus 20 ℃ is used as base oil, can be compounded and mixed with amine and ethylene oxide condensate, ethanedioic acid ester, propylene oxide and ethylene oxide copolymer for application, and the content is 5-500ppm by taking the total weight of the gas holder sealing oil composition as 100%, so that the superior demulsification time reaches 8 min.
And finally, the following steps:
(1) the method is characterized in that N14B and common transformer oil at the temperature of-20 ℃ are combined and mixed, when two base oil products are mixed, the naphthenic base oil is similar to a wax solvent, wax precipitated from the paraffin base oil is dissolved, and the naphthenic oil can interfere wax crystal nucleation and reduce wax precipitation point; the paraffin-based base oil is similar to a viscosity index improver, so that the viscosity index of the naphthenic base oil is improved, the viscosity-temperature performance is improved, and the viscosity-temperature solidification is hindered to a certain extent. The combined action of the two factors finally causes the self-pour-point depression phenomenon;
(2) the polymethacrylate, the polyacrylate and the polymethacrylate can have excellent pour point depressing effect on base oil mixed by N14B and general transformer oil at the temperature of-20 ℃, so that the excellent pour point depressing effect can be further obtained on the basis of the combined mixing and self-pour point depressing of the general transformer oil at the temperature of N14B and the general transformer oil at the temperature of-20 ℃, and a low-temperature fluidity requirement is also provided when the sealing oil of the gas holder is used in regions with large temperature difference (such as Xinjiang, inner Mongolia and the like), and the proper kinematic viscosity, the good lubricity and the fluidity are still maintained;
(3) the sealing oil composition which is suitable for the requirements of proper viscosity and viscosity-temperature characteristics, higher oil density, lower condensation point and good anti-emulsifying water diversion performance of the dry type gas holder sealing oil is obtained by combining and mixing N14B and general transformer oil at the temperature of-20 ℃ and performing pour point depression on polymethacrylate, polyacrylate and polymethacrylate.
Claims (6)
1. The special sealing oil composition for the high-density low-freezing-point gas holder is characterized by having a density of 880kg/m3Above, the condensation point is-50 ℃,
the components of the sealing oil composition comprise base oil and additives,
the base oil is a mixture of paraffin base oil and naphthenic base oil; the paraffin-based base oil is N14B; the naphthenic base oil is-20 ℃ general transformer oil;
the additive comprises a pour point depressant, wherein the pour point depressant is polymethacrylate, and the content of the pour point depressant is 1-10%.
2. The high density, low freezing point gasholder specific seal oil composition of claim 1, wherein said additives further comprise metal deactivators, rust inhibitors, demulsifiers, and viscosity index improvers.
3. The high-density low-freezing-point sealing oil composition special for gas tanks as claimed in claim 2, wherein the metal deactivator is benzotriazole and its derivatives, thiadiazole and its derivatives, and the content is 0.01-1.5%.
4. The high-density low-freezing-point sealing oil composition special for gas holders as claimed in claim 2, wherein the rust inhibitor is barium dinonylnaphthalenesulfonate, alkylphosphonic acid imidazoline salt, N-oleoyl sarcosine octadecylamine, oleamide, and the content is 0.01-1.0%.
5. The high density, low freezing point gas holder specific sealing oil composition of claim 2, wherein the demulsifier is an amine and epoxide condensate, an ethanedioate, a propylene oxide and ethylene oxide copolymer; the content is 5-500 ppm.
6. The high-density low-freezing-point sealing oil composition special for gas holders according to claim 2, wherein the viscosity index improver is polyisobutylene or ethylene propylene copolymer or polymethacrylate or styrene diene copolymer, and the content is 1-10%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011115780.6A CN112226263B (en) | 2020-10-19 | 2020-10-19 | High-density low-condensation-point sealing oil composition special for gas holder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011115780.6A CN112226263B (en) | 2020-10-19 | 2020-10-19 | High-density low-condensation-point sealing oil composition special for gas holder |
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| Publication Number | Publication Date |
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