CN116553996A - Polymerization inhibitor and application thereof - Google Patents

Polymerization inhibitor and application thereof Download PDF

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Publication number
CN116553996A
CN116553996A CN202310825747.XA CN202310825747A CN116553996A CN 116553996 A CN116553996 A CN 116553996A CN 202310825747 A CN202310825747 A CN 202310825747A CN 116553996 A CN116553996 A CN 116553996A
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polymerization inhibitor
polymerization
quinone methide
phenylenediamine
amine compound
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CN202310825747.XA
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Chinese (zh)
Inventor
汤正林
金浦
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Jilin Jinhai Chemical New Materials Co ltd
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Jilin Jinhai Chemical New Materials Co ltd
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Publication of CN116553996A publication Critical patent/CN116553996A/en
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C7/00Purification; Separation; Use of additives
    • C07C7/20Use of additives, e.g. for stabilisation

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Water Supply & Treatment (AREA)
  • Polymerisation Methods In General (AREA)

Abstract

The invention belongs to the technical field of polymerization inhibitors, and particularly relates to a polymerization inhibitor and application thereof. The polymerization inhibitor provided by the invention comprises quinone methide and amine compounds; the quinone methide has a structure as shown in formula 1; the amine compound is one or more of phenylenediamine, N-substituted phenylenediamine, N' -substituted phenylenediamine and quinone diimide; the mass ratio of the quinone methide to the amine compound is 1-5:1-5. The polymerization inhibitor provided by the invention has good environmental protection and polymerization inhibition and inhibition effects, and can be widely applied.Formula 1.

Description

Polymerization inhibitor and application thereof
Technical Field
The invention belongs to the technical field of polymerization inhibitors, and particularly relates to a polymerization inhibitor and application thereof.
Background
Styrene (Styrene) is widely used as an important petrochemical base material as a polymer such as a synthetic resin, an ion exchange resin, and a synthetic rubber. For example, styrene can be polymerized to produce polystyrene resin (PS), expanded Polystyrene (EPS), etc., and is applied to the electronic and electric industry, the daily necessities industry, building materials, packaging materials, etc. For another example, styrene can also be copolymerized with other monomers to manufacture engineering materials with different purposes, such as ABS resin prepared by copolymerizing styrene, acrylonitrile and butadiene, and can be applied to automotive interiors and household appliances; SAN resin is prepared by copolymerization with acrylonitrile and is used for manufacturing transparent plastic products; styrene Butadiene Rubber (SBR) and Styrene Butadiene Latex (SBL) are produced by copolymerization with butadiene, and are used for producing tires, adhesive tapes, papermaking, paints, and the like.
Styrene has unsaturated double bond and forms conjugated system with benzene ring, so that it has strong reaction activity and is easy to produce self-polymerization reaction under the condition of heating. Therefore, the styrene generally has unexpected polymerization reaction in the production process, which can lead to monomer loss, and meanwhile, the generated polymer can be precipitated from the process fluid and deposited on the surface of equipment, thereby blocking tower plates, reboilers, pipelines, pump bodies and the like, and greatly influencing the stable operation of the production device. In order to reduce the polymerization of styrene, the most common method at present is to add an appropriate polymerization inhibitor during the production process to suppress the undesired polymerization reaction.
The polymerization inhibitor can be classified into a True inhibitor (True inhibitor) and a Retarder (Retarder) according to the inhibition effect. The true polymerization inhibitor has a certain polymerization induction period, and basically no polymer is generated during the induction period, but the polymer content is rapidly increased after the induction period is finished. The true polymerization inhibitor has short service life, but high polymerization inhibition efficiency although the dosage is small; typical true inhibitors include 4-hydroxy-2, 6-tetramethylpiperidine nitroxide radical (HTMPO) or diethylhydroxylamine. The polymerization retarder has no induction period, but can obviously reduce the polymerization speed, and the polymer content is slowly increased along with the extension of time. While the polymerization inhibition efficiency of the retarder is lower than that of the true polymerization inhibitor, the retarder is slower to consume in the system and tends to be more effective in the case of an emergency stop of the device. Most of the existing retarders are severely toxic and are environmentally hazardous, such as 2-sec-butyl-4, 6-Dinitrophenol (DNBP). In order to reduce the toxicity of the retarder, scientific researchers try the retarder and the true polymerization inhibitor in a matching way, but the true polymerization inhibitor is consumed too fast in a system, and the retarder performance of the complex is obviously inferior to that of a single retarder.
Therefore, there is a need to develop a polymerization inhibitor which can have good polymerization inhibition performance and high efficiency and environmental protection.
Disclosure of Invention
In view of the above, the invention provides a polymerization inhibitor and application thereof, and the polymerization inhibitor provided by the invention has good polymerization inhibition performance and environmental protection.
In order to solve the technical problems, the invention provides a polymerization inhibitor, which comprises quinone methide and amine compounds;
the quinone methide has a structure as shown in formula 1:
formula 1;
wherein R is 1 And R is 2 Independently is C4-C18 alkyl, C5-C12 cycloalkyl or C7-C15 phenylalkyl;
R 3 and R is 4 independently-H, C1-C18 alkyl, phenyl, substituted phenyl, C5-C12 cycloalkyl, -CN, -COOH, -C=CR 5 、-C≡CR 5 、-COOR 5 、-COR 5 、-OCOR 5 or-CONR 5 ;R 5 is-H, C alkyl of C18, cycloalkyl of C5-C12 or phenylalkyl of C7-C15;
the amine compound is one or more of phenylenediamine, N-substituted phenylenediamine, N' -substituted phenylenediamine and quinone diimide;
the mass ratio of the quinone methide to the amine compound is 1-5:1-5.
Preferably, the quinone methide is a 7-phenyl quinone methide or a 7-carboxylic acid quinone methide.
Preferably, the N, N ' -substituted phenylenediamine is N, N ' -di-sec-butyl-p-phenylenediamine or N, N ' -diphenyl-p-phenylenediamine.
Preferably, the mass ratio of the quinone methide to the amine compound is 2-5:1.
The invention also provides application of the polymerization inhibitor in polymerization inhibition of styrene.
The invention provides a polymerization inhibitor, which comprises quinone methide and amine compounds; the quinone methide has a structure as shown in formula 1:formula 1;
wherein R is 1 And R is 2 Independently is C4-C18 alkyl, C5-C12 cycloalkyl or C7-C15 phenylalkyl; r is R 3 And R is 4 independently-H, C1-C18 alkyl, phenyl, substituted phenyl, C5-C12 cycloalkyl, -CN, -COOH, -C=CR 5 、-C≡CR 5 、-COOR 5 、-COR 5 、-OCOR 5 or-CONR 5 ;R 5 is-H, C alkyl of C18, cycloalkyl of C5-C12 or phenylalkyl of C7-C15; the amine compound is one or more of phenylenediamine, N-substituted phenylenediamine, N' -substituted phenylenediamine and quinone diimide; the mass ratio of the quinone methide to the amine compound is 1-5:1-5. The invention can effectively improve the polymerization inhibition efficiency of the polymerization inhibitor by combining the quinone methide and the amine compound, and has better polymerization inhibition and polymerization inhibition effects, thereby ensuring the stable operation of the styrene preparation device. The polymerization inhibitor provided by the invention has good environmental protection and polymerization inhibition and inhibition effects, and can be widely applied.
Drawings
FIG. 1 is a graph showing the comparison of the polymer content in dotted lines at various times in the systems containing the polymerization inhibitors of example 1 and comparative example 2.
Detailed Description
The invention provides a polymerization inhibitor, which comprises quinone methide and amine compounds.
In the present invention, the quinone methide has a structure as shown in formula 1:
formula 1.
In the present invention, R 1 And R is 2 Independently is a C4-C18 alkyl group, a C5-C12 cycloalkyl group or a C7-C15 phenylalkyl group, preferably independently is a C4-C18 alkyl group, more preferably independently is a tert-butyl group.
In the present invention, R 3 And R is 4 independently-H, C1-C18 alkyl, phenyl, substituted phenyl, C5-C12 cycloalkyl, -CN, -COOH, -C=CR 5 、-C≡CR 5 、-COOR 5 、-COR 5 、-OCOR 5 or-CONR 5 Preferably independently-H or phenyl. In the present invention, R 5 is-H, C alkyl of C18, cycloalkyl of C5-C12 or phenylalkyl of C7-C15.
In the present invention, the quinone methide is preferably 7-phenyl quinone methide or 7-carboxylic acid quinone methide, more preferably 7-phenyl quinone methide.
In the present invention, the amine compound is one or more of phenylenediamine, N-substituted phenylenediamine, N '-substituted phenylenediamine and quinone diimide, more preferably N, N' -substituted phenylenediamine. In the present invention, the N, N ' -substituted phenylenediamine is preferably N, N ' -di-sec-butyl-p-phenylenediamine or N, N ' -diphenyl-p-phenylenediamine.
In the invention, the mass ratio of the quinone methide to the amine compound is preferably 1-5:1-5, more preferably 2-5:1.
The invention has no special requirement on the preservation mode of the polymerization inhibitor, and can preserve the quinone methide and the amine compound in a form of independent package or can preserve the quinone methide and the amine compound in a form of mixture. The invention has no special requirement on the mixing, and the mixing can be uniformly carried out.
The invention also provides application of the polymerization inhibitor in polymerization inhibition of styrene. The invention has no special requirements for the application, and can be realized by adopting a conventional mode in the field. In the present invention, the addition amount of the polymerization inhibitor is preferably 10 to 10000ppm, more preferably 50 to 5000ppm, still more preferably 300ppm, when the polymerization inhibitor is used as a polymerization inhibitor in the synthesis of styrene.
The technical solutions provided by the present invention are described in detail below in conjunction with examples for further illustrating the present invention, but they should not be construed as limiting the scope of the present invention.
Example 1
7-phenyl quinone methide and N, N' -di-sec-butyl-p-phenylenediamine with the mass ratio of 2:1 are used as polymerization inhibitors.
Examples 2 to 3
Polymerization inhibitors were prepared as in example 1, except for referring to Table 1.
Table 1 Condition parameters for preparing efficient environmentally friendly polymerization inhibitor in examples 1-3
Comparative example 1
7-phenyl quinone methide as polymerization inhibitor as comparative example
Comparative example 2
4-hydroxy-2, 6-tetramethylpiperidine nitroxide radical (HTMPO) and 2-sec-butyl-4, 6-Dinitrophenol (DNBP) in a mass ratio of 1:20 are mixed to give a polymerization inhibitor.
The polymerization inhibitors in examples 1-3 and comparative examples 1-2 were added to a styrene experimental apparatus to evaluate the dynamic polymerization inhibition performance of the polymerization inhibitor and examine the control ability of the polymerization inhibitor to the polymer content in a rectifying apparatus. The method comprises the following specific steps:
to 1000g of styrene (TBC removed) was added 300ppm of a polymerization inhibitor; 100mL of the above sample was poured into a polytetrafluoroethylene reaction vessel and a stirring magnet was added, and the remaining sample was poured into a three-necked flask. Connecting a gas guide pipe connected with nitrogen with a flask mouth and placing the gas guide pipe below the liquid level, opening a gas valve to introduce nitrogen into the system, keeping introducing nitrogen in the whole subsequent experimental process, and starting a pump to convey liquid into the reaction kettle; heating was started while stirring, when heated to 125 ℃, timing was started and 10mL of sample was taken at the top of the reaction vessel outlet line, and 10mL of sample was taken every half an hour thereafter for measuring the polymer content until the polymer content reached a steady state, the results of which are shown in table 2.
TABLE 2 polymerization inhibitor Properties of examples 1 to 3 and comparative examples 1 to 2
From Table 2, the polymerization inhibition effect of the high-efficiency environment-friendly polymerization inhibitor is obviously better than that of 7-phenyl quinone methide under the same concentration; the polymerization inhibitor provided by the invention has similar polymerization inhibition effect with the polymerization inhibitor of the comparative example 2, can achieve the combined use effect of the traditional true polymerization inhibitor (HTMPO) and the polymerization inhibitor (DNBP), but the polymerization inhibitor of the comparative example 2 contains 2-sec-butyl-4, 6-Dinitrophenol (DNBP) with higher toxicity.
The polymerization inhibitors in example 1 and comparative example 2 were added to a styrene laboratory apparatus to evaluate the polymerization retarder performance of the polymerization inhibitor and the protection ability of the polymerization inhibitor to the apparatus when the styrene apparatus was accidentally stopped in an emergency. The method comprises the following specific steps:
600ppm of polymerization inhibitor was added to 300g of styrene (TBC removed), the solution was poured into a 500 mL three-neck flask and stirred with a stirrer; then the air duct, the condensing pipe and the reverse plug which are connected with nitrogen are respectively connected with the flask mouth; and opening a gas valve to introduce nitrogen into the system, and keeping introducing nitrogen in the whole subsequent experimental process. Heating was started while stirring, and when heated to 125 ℃, timing was started and about 10mL of the sample was taken out of the flask mouth with a syringe. 10mL of the sample was taken every half hour later for measuring the polymer content, and the results are shown in Table 3.
TABLE 3 polymerization inhibitor Properties of the polymerization inhibitors of example 1 and comparative example 2 at different times
A dotted line versus graph of polymer content at various times in the systems containing the polymerization inhibitors of example 1 and comparative example 2 is plotted according to Table 3, as shown in FIG. 1.
As can be seen from a combination of table 3 and fig. 1, the retarder performance of example 1 is significantly better than the combined use of the true inhibitor (HTMPO) and retarder (DNBP) of comparative example 2, providing longer protection for the styrene unit in the event of an unexpected emergency stop of the unit.
Although the foregoing embodiments have been described in some, but not all, embodiments of the invention, it should be understood that other embodiments may be devised in accordance with the present embodiments without departing from the spirit and scope of the invention.

Claims (5)

1. A polymerization inhibitor, characterized by comprising quinone methide and amine compound;
the quinone methide has a structure as shown in formula 1:
formula 1;
wherein R is 1 And R is 2 Independently is C4-C18 alkyl, C5-C12 cycloalkyl or C7-C15 phenylalkyl;
R 3 and R is 4 independently-H, C1-C18 alkyl, phenyl, substituted phenyl, C5-C12 cycloalkyl, -CN, -COOH, -C=CR 5 、-C≡CR 5 、-COOR 5 、-COR 5 、-OCOR 5 or-CONR 5 ;R 5 is-H, C alkyl of C18, cycloalkyl of C5-C12 or phenylalkyl of C7-C15;
the amine compound is one or more of phenylenediamine, N-substituted phenylenediamine, N' -substituted phenylenediamine and quinone diimide;
the mass ratio of the quinone methide to the amine compound is 1-5:1-5.
2. The polymerization inhibitor according to claim 1, wherein the quinone methide is 7-phenyl quinone methide or 7-carboxylic acid quinone methide.
3. The polymerization inhibitor according to claim 1, wherein the N, N ' -substituted phenylenediamine is N, N ' -di-sec-butyl-p-phenylenediamine or N, N ' -diphenyl-p-phenylenediamine.
4. The polymerization inhibitor according to any one of claims 1 to 3, wherein the mass ratio of the quinone methide to the amine compound is 2 to 5:1.
5. The polymerization inhibitor according to any one of claims 1 to 4, wherein the polymerization inhibitor is used for inhibiting polymerization of styrene.
CN202310825747.XA 2023-07-07 2023-07-07 Polymerization inhibitor and application thereof Pending CN116553996A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024064515A1 (en) * 2022-09-19 2024-03-28 Bl Technologies, Inc. Polymerization inhibitors for high temperature ethylene fractionation trains

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Publication number Priority date Publication date Assignee Title
WO2024064515A1 (en) * 2022-09-19 2024-03-28 Bl Technologies, Inc. Polymerization inhibitors for high temperature ethylene fractionation trains

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