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Styrene rectification polymerization inhibitor and preparation and application method thereof

An application method and technology of a polymerization inhibitor, applied in chemical instruments and methods, distillation purification/separation, hydrocarbons, etc., can solve problems such as increased tar transportation, difficulty in loading, increased tar kinematic viscosity, and impact on economic benefits. , to achieve the effect of inhibiting the formation of large molecular weight polymers, reducing kinematic viscosity and inhibiting polymerization

Inactive Publication Date: 2017-04-05
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But above-mentioned composite polymerization inhibitor also has certain defect
The inventor analyzed the tar composition of a certain styrene plant and found that the use of existing compound inhibitors can reduce the tar yield and improve the styrene yield, but the high molecular weight polymer content in the tar easily leads to an increase in the kinematic viscosity of the tar Large, increasing the difficulty of tar transportation and loading, it is often necessary to add ethylbenzene or styrene to dilute the viscosity, which affects economic benefits; in serious cases, the high polymer may even form a solid, which is prone to the danger of blocking the pipeline

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0022] Weigh a certain amount of styrene and polymerization inhibitor and add them into a three-necked or four-necked flask equipped with nitrogen purging, thermometer, reflux condenser, mechanical or magnetic stirring. After the system was replaced with nitrogen, it was heated at 120°C for 2 hours, and samples were taken to analyze the polystyrene content. The results are shown in Table 1.

[0023] The polymerization inhibition effect of different polymerization inhibitors of table 1

[0024] experiment number Inhibitor and dosage / % Polymer content% 1 (DNBP+Hydroxylamine) / 0.06% 2.56

[0025] 2 (DNBP+Phenylenediamine) / 0.06% 2.38 3 (DNBP+TMHPO ) / 0.06% 1.96 4 Inhibitor of the present invention / 0.06% 1.03

[0026] Note: The DNBP used in experiments 1-3 is 4,6-dinitro-2-sec-butylphenol; the hydroxylamine used in experiment 1 is dihydroxypropyl hydroxylamine; the phenylenediamine used in experiment 2 is p-phenylenediamine; In ...

Embodiment 5～12

[0028] According to the different mass fractions of the three components A, B, and C in the compounded polymerization inhibitor, formulate the compounding scheme, see Table 2.

[0029] Table 2 Compounding scheme of polymerization inhibitor

[0030] Compound inhibitor A component mass fraction B component mass fraction C component mass fraction Inhibitor 1 0.05 0.05 0.9 Inhibitor 2 0.05 0.4 0.55 Inhibitor 3 0.4 0.05 0.55 Inhibitor 4 0.4 0.4 0.2 Inhibitor 5 0.2 0.2 0.6 Inhibitor 6 0.2 0.3 0.5 Inhibitor 7 0.3 0.2 0.5 Inhibitor 8 0.3 0.3 0.4

[0031] The compounded polymerization inhibitors were used in the same amount, heated at 120°C for 2 hours, and samples were taken to analyze the styrene polymer content. The results are shown in Table 3.

[0032] Table 3 The impact of different compounding ratios on the inhibition effect

[0033] experiment number Polymerization inhibitor Styren...

Embodiment 13～19

[0035] The polymerization inhibitor of the present invention was prepared according to the ratio of polymerization inhibitor 8, and the influence of different polymerization inhibitor dosages on the polymerization inhibition effect was investigated. The results are shown in Table 4.

[0036] Table 4 The influence of polymerization inhibitor dosage on the polymerization inhibition effect

[0037] experiment number Inhibitor dosage / % Polymer content / %

[0038] 13 0.01 2.94 14 0.02 2.18 15 0.05 1.85 16 0.06 1.03 17 0.10 0.91 18 0.12 0.84 19 0.20 0.78

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Abstract

The invention belongs to the field of chemical production and relates to a styrene rectification polymerization inhibitor and a preparation and application method thereof, in particular to a compound polymerization inhibitor used for styrene rectification in an ethylbenzene dehydrogenation process. The polymerization inhibitor is formed by compounding bis(2,2,6,6-tetramethyl-4-piperidyl)sebate nitrogen oxygen free radicals, triphenylphosphine and sulfolane, the characteristics of all the components are ingeniously used, a synergistic effect is produced, and the polymerization inhibition efficiency is high; the solubility in an ethylbenzene / styrene system is high, and the polymerization inhibition effect is stable; production of styrene high polymers can be inhibited; the risk that a pipeline is blocked by tar is reduced; safe and smooth operation of a styrene device is ensured; and the economic benefits are increased.

Description

technical field [0001] The invention belongs to the field of chemical production, and relates to a styrene rectifying polymerization inhibitor and its configuration and application method, in particular to a composite type polymerization inhibitor used for rectifying and refining styrene in an ethylbenzene dehydrogenation process. Background technique [0002] Styrene (SM) is the basic product of petrochemical industry and has a wide range of uses. It is mainly used to synthesize various styrene series resins and styrene-butadiene rubber, and can also be used in coatings, dyes, pharmaceuticals and mineral processing industries. [0003] Styrene has the property of thermal polymerization, that is, the temperature can initiate its polymerization. At room temperature, styrene can be slowly polymerized, and the temperature rise will accelerate the polymerization reaction. The industrial production of styrene monomer is mainly based on the dehydrogenation process of ethylbenzene...

Claims

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Application Information

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IPC IPC(8): C07C7/20C07C7/05C07C15/46
CPCC07C7/20C07C7/05C07C15/46
Inventor 王申军菅秀君马瑞杰贾庆龙
Owner CHINA PETROLEUM & CHEM CORP
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