Alkylbenzene heat conduction oil and preparation method thereof

Abstract

The invention discloses alkylbenzene heat conduction oil and a preparation method thereof. The invention belongs to the technical field of heat-conducting oil, and by optimizing the formula proportion of the high-temperature antioxidant, the high-temperature antioxidant can still keep a stable antioxidant effect in a high-temperature environment of 300 DEG C or above, and the aging speed of an oil product is remarkably delayed; meanwhile, by combining the synergistic effect of polyisobutene amine and organosiloxane, carbon deposition and coking generated in the high-temperature operation process are effectively inhibited, and cleanliness and efficient heat transfer of the system are ensured; according to the invention, a modified silicon dioxide and polyether amine compounding technology is adopted, so that the dispersing capacity of the heat-conducting oil on solid particles and impurities is enhanced, and the deposition phenomenon is avoided, so that the reliability of a system is improved; the invention is suitable for various complex working conditions, such as the fields of chemical industry, energy, metallurgy and the like, is particularly suitable for equipment needing long-time high-temperature operation, and can meet high-performance requirements in different scenes.

Description

Technical Field

[0001] The invention belongs to the technical field of heat transfer oil, and specifically refers to an alkylbenzene heat transfer oil and a preparation method thereof. Background Art

[0002] With the continuous development of industrial technology, thermal oil has been widely used in the field of high-temperature heat transfer, especially in high-temperature environments in industries such as chemical industry, petroleum processing, and solar thermal utilization. However, most of the thermal oil products on the market are based on traditional formulas and processes. Although they can meet the heat transfer needs in high-temperature environments to a certain extent, they still have significant deficiencies in terms of antioxidant performance, anti-coking ability, and service life. These problems have led to low efficiency, high maintenance costs, and difficulty in adapting to complex working conditions in practical applications.

[0003] In the prior art, the patent document with publication number CN104893683B discloses a coking-resistant alkylbenzene synthetic heat transfer oil and its preparation method. By adding ingredients such as amine antioxidants, phenolic antioxidants, detergents and dispersants, the antioxidant and anti-coking capabilities of the heat transfer oil are significantly improved. However, this technology has high requirements on the performance indicators of the base oil (such as initial boiling point>320℃, density>0.83g / cm 3 , flash point>180℃, etc.), which limits the selection of raw materials and increases production costs. In addition, although its self-cleaning performance has been improved, precipitation or coking may still occur under extreme conditions, affecting the stability and reliability of long-term operation.

[0004] Another patent document with the publication number CN103305192B discloses a high-temperature heat transfer oil composition, which uses mineral oil as the base oil, supplemented with high-temperature antioxidants, detergents, dispersants and metal passivators, and has a maximum operating temperature of 320°C. This design has good thermal stability and heat transfer effect, but its base oil component is relatively simple, mainly relying on HVI base oil, cycloalkyl base oil and alkylbenzene, and fails to give full play to the unique advantages of alkylbenzene heat transfer oil. At the same time, due to the large number of additives, the formula may be complicated, the production and maintenance difficulties may be increased, and its flexibility and economy in practical applications may be limited.

[0005] The above problems show that the existing heat transfer oil technology still has obvious technical bottlenecks in terms of high temperature stability, anti-oxidation performance, anti-coking ability and long-term operation reliability, and it is difficult to effectively cope with the higher requirements for heat transfer oil under complex working conditions. Therefore, it is of great technical significance and application value to develop an optimized alkylbenzene heat transfer oil and its preparation method to overcome the shortcomings of the existing technology and provide a new solution that is more efficient, stable and adaptable to changing environments. Summary of the invention

[0006] The purpose of the present invention is to provide an alkylbenzene heat transfer oil and a preparation method thereof. The present invention optimizes the formula ratio of a high-temperature antioxidant so that the antioxidant can still maintain a stable antioxidant effect in a high-temperature environment of more than 300°C, significantly delaying the aging speed of the oil; at the same time, the synergistic effect of polyisobutylene amine and organic siloxane is combined to effectively inhibit carbon deposition and coking generated during high-temperature operation, thereby ensuring the cleanliness and efficient heat transfer of the system; the present invention adopts a modified silica and polyetheramine compounding technology to enhance the dispersibility of the heat transfer oil on solid particles and impurities, avoid the occurrence of deposition, and thus improve the reliability of the system; the present invention is applicable to a variety of complex working conditions, such as chemical industry, energy, metallurgy and other fields, and is particularly suitable for equipment that needs to operate at high temperature for a long time, and can meet high performance requirements in different scenarios.

[0007] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is as follows: an alkylbenzene heat transfer oil and a preparation method thereof, wherein the alkylbenzene heat transfer oil comprises the following components in parts by weight: 60 to 90 parts of base oil, 2 to 8 parts of high-temperature antioxidant, 1 to 10 parts of anti-coking aid, 1 to 5 parts of dispersion stabilizer, 0.2 to 3 parts of polarity regulator, 0.1 to 1 part of metal passivator, 0.1 to 1 part of lubricity enhancer and 0.02 to 0.3 parts of corrosion inhibitor.

[0008] Preferably, the alkylbenzene heat transfer oil comprises the following components in parts by weight: 70-80 parts of base oil, 3-6 parts of high-temperature antioxidant, 2-5 parts of anti-coking aid, 1-3 parts of dispersion stabilizer, 0.5-2 parts of polarity regulator, 0.2-0.8 parts of metal passivator, 0.1-0.5 parts of lubricity enhancer and 0.05-0.2 parts of corrosion inhibitor.

[0009] Preferably, the high temperature antioxidant is prepared by compounding aromatic amine compounds, phenolic compounds and sulfide esters in a weight ratio of (2.0-3.0):(1.2-2.0):(0.8-1.5).

[0010] Preferably, the anti-coking aid is prepared by compounding polyisobutyleneamine, alkyl phosphate and organosiloxane in a weight ratio of (1.5-2.5):(0.8-1.5):(0.5-1.0).

[0011] Preferably, the dispersion stabilizer is prepared by compounding polyetheramine, fatty acid amide and modified silicon dioxide in a weight ratio of (1.0-1.8):(0.6-1.2):(0.4-0.8).

[0012] Preferably, the base oil is composed of the first alkylbenzene, the second alkylbenzene and the cycloalkyl mineral oil in a weight ratio of (50-60):(20-30):(10-20).

[0013] Preferably, the first alkylbenzene comprises high-purity monoalkylbenzene of model AB-H100.

[0014] Preferably, the second alkylbenzene comprises dialkylbenzene of model AB-D200.

[0015] Preferably, the naphthenic mineral oil comprises a refined naphthenic oil having a viscosity index ≥95.

[0016] The present invention also provides a method for preparing an alkylbenzene heat transfer oil, the method comprising the following steps:

[0017] (1) preheating and mixing the first alkylbenzene, the second alkylbenzene and the cycloalkyl mineral oil, and then performing a vacuum degassing treatment to obtain a mixed oil;

[0018] (2) subjecting the mixed oil to molecular distillation for purification, and then cooling and filtering to obtain the base oil;

[0019] (3) Weighing high-temperature antioxidant, anti-coking aid, dispersion stabilizer, polarity regulator, metal passivator, lubricity enhancer and corrosion inhibitor according to the formula ratio, adding them into another smaller container, stirring and mixing at an appropriate temperature to make the additives preliminarily mixed and uniform, to form an additive premix;

[0020] (4) After the base oil and the additive premix are mixed and stirred, the mixture is filtered through a filtering device to remove possible impurities and undissolved particles, and the filtered oil is subjected to vacuum degassing to obtain the alkylbenzene heat transfer oil.

[0021] The beneficial effects achieved by the present invention using the above structure are as follows: (1) The present invention optimizes the formula ratio of the high-temperature antioxidant so that it can still maintain a stable antioxidant effect in a high-temperature environment above 300°C, thereby significantly delaying the aging rate of the oil; (2) The present invention combines the synergistic effect of polyisobutylene amine and organic silicone ane to effectively inhibit carbon deposits and coking generated during high-temperature operation, thereby ensuring the cleanliness and efficient heat transfer of the system; (3) The present invention adopts the compounding technology of modified silica and polyether amine to enhance the dispersion ability of the heat transfer oil on solid particles and impurities, avoid the occurrence of deposition, and thus improve the reliability of the system; (4) The present invention is applicable to a variety of complex working conditions, such as chemical, energy, metallurgical and other fields, and is particularly suitable for equipment that requires long-term high-temperature operation, and can meet high-performance requirements in different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Thermal conductivity of alkylbenzene heat transfer oil.

[0023] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] Unless otherwise defined, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein may be applied to the present invention. The preferred implementation methods and materials described herein are for demonstration purposes only and are not intended to limit the content of this application.

[0026] The experimental methods in the following examples are conventional methods unless otherwise specified; the experimental materials and test strains used in the following examples are purchased from commercial channels unless otherwise specified.

[0027] Example 1

[0028] Alkylbenzene heat transfer oil and preparation method thereof

[0029] The alkylbenzene heat transfer oil comprises the following components in parts by weight: 70 parts of base oil, 6 parts of high temperature antioxidant, 2 parts of anti-coking aid, 3 parts of dispersion stabilizer, 0.5 parts of polarity regulator, 0.8 parts of metal passivator, 0.1 parts of lubricity enhancer and 0.2 parts of corrosion inhibitor.

[0030] The high-temperature antioxidant is prepared by compounding aromatic amine compounds, phenolic compounds and sulfide esters in a weight ratio of 2:1.2:0.9.

[0031] The anti-coking aid is prepared by compounding polyisobutylene amine, alkyl phosphate and organosiloxane in a weight ratio of 1.5:0.8:0.5.

[0032] The dispersion stabilizer is prepared by compounding polyetheramine, fatty acid amide and modified silicon dioxide in a weight ratio of 1:0.6:0.4.

[0033] The base oil is composed of a first alkylbenzene, a second alkylbenzene and a naphthenic mineral oil in a weight ratio of 5:2:1.

[0034] Wherein, the first alkylbenzene comprises high-purity monoalkylbenzene with model number AB-H100.

[0035] Wherein, the second alkylbenzene includes dialkylbenzene with model number AB-D200.

[0036] Wherein, the naphthenic mineral oil comprises refined naphthenic oil with a viscosity index ≥95.

[0037] The present invention also provides a method for preparing an alkylbenzene heat transfer oil, the method comprising the following steps:

[0038] (1) preheating and mixing the first alkylbenzene, the second alkylbenzene and the cycloalkyl mineral oil, and then performing a vacuum degassing treatment to obtain a mixed oil;

[0039] (2) subjecting the mixed oil to molecular distillation for purification, followed by cooling and filtering to obtain the base oil;

[0040] (3) Weighing high-temperature antioxidant, anti-coking aid, dispersion stabilizer, polarity regulator, metal passivator, lubricity enhancer and corrosion inhibitor according to the formula ratio, adding them into another smaller container, stirring and mixing at an appropriate temperature to make the additives preliminarily mixed and uniform, to form an additive premix;

[0041] (4) After the base oil and the additive premix are mixed and stirred, the mixture is filtered through a filtering device to remove possible impurities and undissolved particles, and the filtered oil is subjected to vacuum degassing to obtain the alkylbenzene heat transfer oil.

[0042] Example 2

[0043] Alkylbenzene heat transfer oil and preparation method thereof

[0044] The alkylbenzene heat transfer oil comprises the following components in parts by weight: 80 parts of base oil, 3 parts of high temperature antioxidant, 5 parts of anti-coking aid, 1 part of dispersion stabilizer, 2 parts of polarity regulator, 0.2 parts of metal passivator, 0.5 parts of lubricity enhancer and 0.05 parts of corrosion inhibitor.

[0045] The high-temperature antioxidant is prepared by compounding aromatic amine compounds, phenolic compounds and sulfide esters in a weight ratio of 3:1.2:0.8.

[0046] The anti-coking aid is prepared by compounding polyisobutylene amine, alkyl phosphate and organosiloxane in a weight ratio of 2.5:1.5:1.

[0047] The dispersion stabilizer is prepared by compounding polyetheramine, fatty acid amide and modified silicon dioxide in a weight ratio of 1.8:1.2:0.7.

[0048] The base oil is composed of a first alkylbenzene, a second alkylbenzene and a naphthenic mineral oil in a weight ratio of 6:2:2.

[0049] Wherein, the first alkylbenzene comprises high-purity monoalkylbenzene with model number AB-H100.

[0050] Wherein, the second alkylbenzene includes dialkylbenzene with model number AB-D200.

[0051] Wherein, the naphthenic mineral oil comprises refined naphthenic oil with a viscosity index ≥95.

[0052] The present invention also provides a method for preparing an alkylbenzene heat transfer oil, and the preparation method is implemented with reference to Example 1.

[0053] Example 3

[0054] Alkylbenzene heat transfer oil and preparation method thereof

[0055] The alkylbenzene heat transfer oil comprises the following components in parts by weight: 75 parts of base oil, 5 parts of high temperature antioxidant, 6 parts of anti-coking aid, 2 parts of dispersion stabilizer, 1 part of polarity regulator, 0.5 parts of metal passivator, 0.3 parts of lubricity enhancer and 0.01 parts of corrosion inhibitor.

[0056] The high-temperature antioxidant is prepared by compounding aromatic amine compounds, phenolic compounds and sulfide esters in a weight ratio of 2.5:1.6:1.

[0057] The anti-coking aid is prepared by compounding polyisobutylene amine, alkyl phosphate and organosiloxane in a weight ratio of 2:1:0.8.

[0058] The dispersion stabilizer is prepared by compounding polyetheramine, fatty acid amide and modified silicon dioxide in a weight ratio of 1.4:1:0.5.

[0059] The base oil is composed of a first alkylbenzene, a second alkylbenzene and a naphthenic mineral oil in a weight ratio of 55:25:16.

[0060] Wherein, the first alkylbenzene comprises high-purity monoalkylbenzene with model number AB-H100.

[0061] Wherein, the second alkylbenzene includes dialkylbenzene with model number AB-D200.

[0062] Wherein, the naphthenic mineral oil comprises refined naphthenic oil with a viscosity index ≥95.

[0063] The present invention also provides a method for preparing an alkylbenzene heat transfer oil, and the preparation method is implemented with reference to Example 1.

[0064] Experimental Example 1

[0065] The heat transfer oils prepared in Examples 1, 2 and 3 of the present invention were used as samples and divided into Example 1 group to Example 3 group, and the control group used alkylbenzene heat transfer oil commonly used on the market; a thermal conductivity tester was used to measure the thermal conductivity of the heat transfer oils in Examples 1-3 groups and the control group at different temperatures of 300° C., and the data were recorded and compared and analyzed.

[0066] Result analysis: Figure 1 As shown, at 300° C., the thermal conductivity of Examples 1-3 groups is higher than that of the control group, among which the thermal conductivity of Example 3 group is the highest.

[0067] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0068] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. An alkylbenzene heat transfer oil, characterized in that: The alkylbenzene heat transfer oil comprises the following components in parts by weight: 60-90 parts of base oil, 2-8 parts of high-temperature antioxidant, 1-10 parts of anti-coking aid, 1-5 parts of dispersion stabilizer, 0.2-3 parts of polarity regulator, 0.1-1 parts of metal passivator, 0.1-1 parts of lubricity enhancer and 0.02-0.3 parts of corrosion inhibitor.

2. An alkylbenzene heat transfer oil according to claim 1, characterized in that: The alkylbenzene heat transfer oil comprises the following components in parts by weight: 70-80 parts of base oil, 3-6 parts of high-temperature antioxidant, 2-5 parts of anti-coking aid, 1-3 parts of dispersion stabilizer, 0.5-2 parts of polarity regulator, 0.2-0.8 parts of metal passivator, 0.1-0.5 parts of lubricity enhancer and 0.05-0.2 parts of corrosion inhibitor.

3. An alkylbenzene heat transfer oil according to claim 2, characterized in that: The high-temperature antioxidant is prepared by compounding aromatic amine compounds, phenolic compounds and sulfide esters in a weight ratio of (2.0-3.0):(1.2-2.0):(0.8-1.5).

4. An alkylbenzene heat transfer oil according to claim 3, characterized in that: The anti-coking auxiliary agent is prepared by compounding polyisobutylene amine, alkyl phosphate and organic siloxane in a weight ratio of (1.5-2.5):(0.8-1.5):(0.5-1.0).

5. An alkylbenzene heat transfer oil according to claim 4, characterized in that: The dispersion stabilizer is prepared by compounding polyetheramine, fatty acid amide and modified silicon dioxide in a weight ratio of (1.0-1.8):(0.6-1.2):(0.4-0.8).

6. An alkylbenzene heat transfer oil according to claim 5, characterized in that: The base oil is composed of a first alkylbenzene, a second alkylbenzene and a naphthenic mineral oil in a weight ratio of (50-60):(20-30):(10-20).

7. An alkylbenzene heat transfer oil according to claim 6, characterized in that: The first alkylbenzene includes high-purity monoalkylbenzene with model number AB-H100.

8. An alkylbenzene heat transfer oil according to claim 7, characterized in that: The second alkylbenzene includes dialkylbenzene with model number AB-D200.

9. An alkylbenzene heat transfer oil according to claim 8, characterized in that: The naphthenic mineral oil includes refined naphthenic oil with a viscosity index of ≥95.

10. A method for preparing an alkylbenzene heat transfer oil according to claim 9, characterized in that: The preparation method comprises the following steps: (1) preheating and mixing the first alkylbenzene, the second alkylbenzene and the cycloalkyl mineral oil, and then performing vacuum degassing treatment to obtain a mixed oil; (2) subjecting the mixed oil to molecular distillation for purification, and then cooling and filtering to obtain the base oil; (3) Weighing high-temperature antioxidant, anti-coking aid, dispersion stabilizer, polarity regulator, metal passivator, lubricity enhancer and corrosion inhibitor according to the formula ratio, adding them into another smaller container, stirring and mixing at an appropriate temperature to make the additives preliminarily mixed and uniform, to form an additive premix; (4) After the base oil and the additive premix are mixed and stirred, the mixture is filtered through a filtering device to remove possible impurities and undissolved particles, and the filtered oil is subjected to vacuum degassing to obtain the alkylbenzene heat transfer oil.

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