A kind of high-efficiency viscosity reducer for quenching oil and preparation method thereof

Abstract

The invention relates to the field of petrochemical industry, and in particular to a high-efficiency viscosity reducer for quench oil and a preparation method thereof. The high-efficiency viscosity reducer comprises the following components in parts by weight: 200-300 of a hindered phenol antioxidant; 100-200 of an acrylate antioxidant; 120-240 of a phosphite antioxidant; 30-80 of a dispersant; and 400-600 of a solvent. The viscosity reducer can effectively reduce the viscosity of the quench oil and can maintain it at a relatively satisfactory level for a long time.

Description

Technical Field

[0001] The invention relates to the field of petrochemical industry, and in particular to a high-efficiency viscosity reducer for quenching oil and a preparation method thereof. Background Art

[0002] The quench oil system is an important part of the ethylene plant, and the viscosity control of the quench oil is a key factor affecting the quench oil system. The increase in its viscosity will reduce the heat transfer efficiency of the dilution steam generator and affect the separation effect of the gasoline fractionator. The prior art often uses viscosity reducers to control the viscosity of the quench oil, but the current viscosity reducers have poor viscosity control effects, large dosages but average effects, and high costs, and the formulation of the viscosity reducers needs to be further improved. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a high-efficiency viscosity reducer, comprising the following components in parts by weight:

[0004]

[0005] Preferably, the high-efficiency viscosity reducer comprises the following components in parts by weight:

[0006]

[0007] Wherein, the hindered phenol antioxidant also contains a thioether structure;

[0008] The acrylate antioxidant contains both acrylate and hindered phenol structures.

[0009] Preferably, the structure of the hindered phenol antioxidant is as shown in formula (1):

[0010]

[0011] Among them, R 1 -R 8 The same or different groups are each selected from a C1-C6 alkyl group, preferably a methyl group, an ethyl group or a tert-butyl group.

[0012] Preferably, the structure of the acrylate antioxidant is as shown in formula (2):

[0013]

[0014] Among them, G 1 -G 8 are the same or different, each selected from a C1-C6 alkyl group, preferably a methyl group, an ethyl group or a tert-butyl group, and X is a connecting bond or a C1-C10 alkylene group.

[0015] Preferably, the structure of the hindered phenol antioxidant is as shown in formula (3) or (4):

[0016]

[0017] Formula (3) is 4,4'-thiobis(2,6-tert-butylphenol), whose trade name is antioxidant 4426-S. Formula (4) is 4,4'-thiobis(6-tert-butyl-2-methylphenol), whose trade name is antioxidant 736.

[0018] Preferably, the structure of the acrylate antioxidant is as shown in formula (5):

[0019]

[0020] That is, 2-tert-butyl-6-(3-tert-butyl-2-hydroxy-5-methylphenyl)methyl-4-methylphenyl acrylate, with the trade name Antioxidant 3052.

[0021] Those skilled in the art know that the condensation of aromatic components in the quench oil is the main reason for the increase in the viscosity of the quench oil. The hindered phenol antioxidant is an alkoxy free radical scavenger, which generates stable compounds and blocks the chain reaction. At the same time, the hindered phenol antioxidant also contains a thioether structure and is also a hydroperoxide decomposer, which can convert the hydroperoxides generated in the oxidation process into free radicals, non-reactive and thermally stable products. Therefore, the corresponding hindered phenol antioxidant is an effective inhibitor.

[0022] As mentioned above, the acrylate antioxidant contains both acrylate and hindered phenol structures, which can further capture polymer free radicals and alkyl free radicals generated by the thermal decomposition of the quench oil under anaerobic conditions, and finally generate stable phenoxy free radicals. On the basis of adding the above-mentioned hindered phenol antioxidant, the acrylate antioxidant can be used to further supplement the polymerization inhibition ability of the hindered phenol antioxidant. Moreover, the inventor unexpectedly found in the experimental process of testing the formula that the cooperation of the above-mentioned hindered phenol antioxidant and the acrylate antioxidant can effectively reduce the viscosity of the quench oil, and can be maintained at a relatively satisfactory level for a long time, that is, the compounding of the two can be used to reduce the viscosity of the quench oil.

[0023] Wherein, the phosphite antioxidant is selected from one or two of dibutyl phosphite, triisooctyl phosphite, triphenyl phosphite and triphenyl phosphate.

[0024] Preferably, the phosphite antioxidant is selected from triphenyl phosphite.

[0025] As is known in the art, phosphite antioxidants are generally used as auxiliary antioxidants and can be used together with hindered phenol antioxidants to achieve better results. In the present invention, the phosphite antioxidant also has the effect of a metal ion passivator, further complexing the metal ions in the quenching oil, preventing or reducing the catalytic effect of the metal ions, and delaying the progress of the polymerization reaction.

[0026] Wherein, the dispersant is an alkenyl butadiene imine dispersant.

[0027] Preferably, the alkenyl butadiene imide dispersant is selected from one or more of monoalkenyl succinimides, diene succinimides, polyalkenyl succinimides, and high nitrogen polyisobutylene succinimides.

[0028] More preferably, the alkenyl butadiene imine dispersant is selected from monoalkenyl butadiene imine and diene butadiene imine.

[0029] The use of dispersants can further improve the use environment of quench oil. Dispersants can combine with polymers or scale. Although the presence of inhibitors can greatly slow down the polymerization process, it is inevitable that there are polymers that have been or are being polymerized in the oil. These polymers combined with dispersants are not easy to deposit on the surface of the equipment. For deposited scale, the addition of dispersants is also beneficial to the cleaning of scale, which can increase the use time of quench oil and reduce costs.

[0030] Wherein, the solvent is a hydrocarbon solvent, further selected from one or more of hexane, cyclohexane, diesel, toluene, xylene and 200# solvent.

[0031] Preferably, the solvent is selected from one or more of cyclohexane, toluene and 200# solvent.

[0032] In addition, the present invention provides a method for preparing a high-efficiency viscosity reducer, the preparation method comprising the following steps:

[0033] Mix the above components evenly according to the formula.

[0034] Mixing can be done all at once or in steps.

[0035] Preferably, heating is performed during the mixing process.

[0036] Preferably, the mixture is filtered after mixing.

[0037] The invention also provides an application of a high-efficiency viscosity reducer, wherein the high-efficiency viscosity reducer is applied to quench oil.

[0038] Wherein, based on the circulation amount of the quenching oil, the addition amount of the high-efficiency viscosity reducer is 10-5000 ppm, preferably 20-1000 ppm, and more preferably 30-500 ppm.

[0039] The present invention also provides a method for using the high-efficiency viscosity reducer, which comprises the following steps:

[0040] It can be added directly to the quenching oil, or the above viscosity reducer can be added to the solvent first and then added to the quenching oil.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] (1) The condensation of aromatic components in the quench oil is the main reason for the increase in the viscosity of the quench oil. The antioxidant used in the present invention contains a hindered phenol structure, a thioether structure and an acrylate structure, and has a good inhibitory effect. Moreover, the combination of the hindered phenol antioxidant and the acrylate antioxidant of the present invention can fully and efficiently exert the inhibitory effect, effectively reduce the viscosity of the quench oil, and can maintain it at a relatively satisfactory level for a long time.

[0043] (2) The formula of the present invention also adds a phosphite antioxidant, which not only has the effect of inhibiting polymerization, but also has the effect of a metal ion passivator, protecting the metal and further reducing the occurrence of polymerization. In addition, the use of a dispersant can effectively inhibit free radical polymerization, prevent the deposition of scale, and extend the production and operation cycle of the device.

[0044] (3) The present invention obtains a highly efficient viscosity reducer for quenching oil through a simple formula, has a simple preparation method, low cost and good effect, and can control the viscosity of the quenching oil within a relatively satisfactory range. It has broad application prospects and huge commercial value. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] The present invention provides a high-efficiency viscosity reducer, comprising the following components in parts by weight:

[0047]

[0048] Preferably, the high-efficiency viscosity reducer comprises the following components in parts by weight:

[0049]

[0050] Wherein, the hindered phenol antioxidant also contains a thioether structure;

[0051] The acrylate antioxidant contains both acrylate and hindered phenol structures.

[0052] Preferably, the structure of the hindered phenol antioxidant is as shown in formula (1):

[0053]

[0054] Among them, R 1 -R 8 The same or different groups are each selected from a C1-C6 alkyl group, preferably a methyl group, an ethyl group or a tert-butyl group.

[0055] Preferably, the structure of the acrylate antioxidant is as shown in formula (2):

[0056]

[0057] Among them, G 1 -G 8 are the same or different, each selected from a C1-C6 alkyl group, preferably a methyl group, an ethyl group or a tert-butyl group, and X is a connecting bond or a C1-C10 alkylene group.

[0058] Preferably, the structure of the hindered phenol antioxidant is as shown in formula (3) or (4):

[0059]

[0060] Formula (3) is 4,4'-thiobis(2,6-tert-butylphenol), whose trade name is antioxidant 4426-S. Formula (4) is 4,4'-thiobis(6-tert-butyl-2-methylphenol), whose trade name is antioxidant 736.

[0061] Preferably, the structure of the acrylate antioxidant is as shown in formula (5):

[0062]

[0063] That is, 2-tert-butyl-6-(3-tert-butyl-2-hydroxy-5-methylphenyl)methyl-4-methylphenyl acrylate, with the trade name Antioxidant 3052.

[0064] Wherein, the phosphite antioxidant is selected from one or two of dibutyl phosphite, triisooctyl phosphite, triphenyl phosphite and triphenyl phosphate.

[0065] Preferably, the phosphite antioxidant is selected from triphenyl phosphite.

[0066] Wherein, the dispersant is an alkenyl butadiene imine dispersant.

[0067] Preferably, the alkenyl butadiene imide dispersant is selected from one or more of monoalkenyl succinimides, diene succinimides, polyalkenyl succinimides, and high nitrogen polyisobutylene succinimides.

[0068] More preferably, the alkenyl butadiene imine dispersant is selected from monoalkenyl butadiene imine and diene butadiene imine.

[0069] Wherein, the solvent is a hydrocarbon solvent, further selected from one or more of hexane, cyclohexane, diesel, toluene, xylene and 200# solvent.

[0070] Preferably, the solvent is selected from one or more of cyclohexane, toluene and 200# solvent.

[0071] In addition, the present invention provides a method for preparing a high-efficiency viscosity reducer, the preparation method comprising the following steps:

[0072] Mix the above components evenly according to the formula.

[0073] Mixing can be done all at once or in steps.

[0074] Preferably, heating is performed during the mixing process.

[0075] Preferably, the mixture is filtered after mixing.

[0076] The invention also provides an application of a high-efficiency viscosity reducer, wherein the high-efficiency viscosity reducer is applied to quench oil.

[0077] Wherein, based on the circulation amount of the quenching oil, the addition amount of the high-efficiency viscosity reducer is 10-5000 ppm, preferably 20-1000 ppm, and more preferably 30-500 ppm.

[0078] The present invention also provides a method for using the high-efficiency viscosity reducer, which comprises the following steps:

[0079] It can be added directly to the quenching oil, or the above viscosity reducer can be added to the solvent first and then added to the quenching oil.

[0080] raw material:

[0081] Antioxidant 4426-S, CAS No. 4673-51-2, has the following structure:

[0082]

[0083] Antioxidant 3052, CAS No. 61167-58-6, has the following structure:

[0084]

[0085] Antioxidant TPP, CAS No. 101-02-0, has the following structure:

[0086]

[0087] Example 1

[0088] A high-efficiency viscosity reducer, the raw material composition of which is (parts by mass):

[0089]

[0090] The preparation steps are as follows:

[0091] Mix the above components evenly according to the formula.

[0092] Example 2

[0093] A high-efficiency viscosity reducer, the raw material composition of which is (parts by mass):

[0094]

[0095] The preparation steps are as follows:

[0096] Mix the above components evenly according to the formula.

[0097] Comparative Example 1

[0098] A high-efficiency viscosity reducer, the raw material composition of which is (parts by mass):

[0099]

[0100]

[0101] The preparation steps are as follows:

[0102] Mix the above components evenly according to the formula.

[0103] Comparative Example 2

[0104] A high-efficiency viscosity reducer, the raw material composition of which is (parts by mass):

[0105]

[0106] The preparation steps are as follows:

[0107] Mix the above components evenly according to the formula.

[0108] Comparative Example 3

[0109] A high-efficiency viscosity reducer, the raw material composition of which is (parts by mass):

[0110]

[0111] The preparation steps are as follows:

[0112] Mix the above components evenly according to the formula.

[0113] Comparative Example 4

[0114] Commercially available viscosity reducer, brand LT-1.

[0115] Performance Testing

[0116] The above viscosity reducer was added to the quench oil at a ratio of 100 ppm. The temperature was kept constant at 215°C for 48 hours. Samples were taken every 6 hours. The kinematic viscosity of the quench oil was tested at 50°C. The test results are shown in Table 1.

[0117] Table 1:

[0118]

[0119] As can be seen from the above table, the viscosity reducer of the present invention is compounded with hindered phenolic antioxidant and acrylate antioxidant, which can effectively and continuously control the viscosity of the quench oil, while in Comparative Examples 1-2, only hindered phenolic antioxidant or acrylate antioxidant is added, and the effect is very poor. As can be seen from Comparative Examples 3-4, the use of antioxidant 1010 and commercially available viscosity reducers can also have the effect of reducing viscosity, but the effect is OK for a short time, and the viscosity of the quench oil increases rapidly in the later stage, and the effect is not good.

[0120] Those skilled in the art will appreciate that the above described embodiments are only a 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 the field without creative work are within the scope of protection of the present invention.

Claims

1. A high-efficiency viscosity reducer, the technical characteristics of which are ， Including the following mass parts composition: The structure of the hindered phenol antioxidant is shown in formula (1): Among them, R 1 -R 8 The same or different, each selected from C1-C6 alkyl; The structure of the acrylate antioxidant is shown in formula (2): Among them, G 1 -G 8 are the same or different, each selected from a C1-C6 alkyl group, and X is a C1-C10 alkylene group; The phosphite antioxidant is selected from one or two of dibutyl phosphite, triisooctyl phosphite and triphenyl phosphite; The dispersant is an alkenyl butadiene imine dispersant; The alkenyl butadiene imine dispersant is selected from one or two of monoalkenyl butadiene imine and diene butadiene imine; The solvent is a hydrocarbon solvent; The hydrocarbon solvent is selected from one or more of hexane, cyclohexane, diesel, toluene, xylene and 200# solvent.

2. A high-efficiency viscosity reducer according to claim 1, characterized in that, in formula (1), R 1 -R 8 are the same or different and are each selected from methyl, ethyl or tert-butyl.

3. A high-efficiency viscosity reducer according to claim 1, wherein in formula (2), G 1 -G 8 are the same or different and are each selected from methyl, ethyl or tert-butyl.

4. The high-efficiency viscosity reducer according to claim 1, wherein the hindered phenol antioxidant has a structure as shown in formula (3) or (4): The structure of the acrylate antioxidant is shown in formula (5):

5. A high-efficiency viscosity reducer according to claim 1, wherein the phosphite antioxidant is selected from triphenyl phosphite.

6. The high-efficiency viscosity reducer according to claim 1, wherein the hydrocarbon solvent is selected from one or more of cyclohexane, toluene and 200# solvent.

7. A method for preparing the high-efficiency viscosity reducer according to any one of claims 1 to 6, wherein the method comprises the following steps: Mix the above components evenly according to the formula.

8. The preparation method according to claim 7, wherein the mixing is performed in one step or in stages.

9. The preparation method according to claim 7, wherein the technical feature is that heating is performed during the mixing process; and / or filtering is performed after mixing.

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