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Refining method of styrene

A purification method, technology of styrene, applied in chemical instruments and methods, purification/separation of hydrocarbons, purification/separation of chemical modification, etc., can solve problems such as unfavorable environmental protection, low efficiency, toxicity and so on

Active Publication Date: 2015-04-01
NANTONG HONGTU RUBBER & PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Styrene monomer has the property of self-polymerization and can be polymerized at normal temperature. The higher the temperature, the faster the polymerization speed Adding a polymerization inhibitor in the process, because the current polymerization inhibitor used for styrene rectification is toxic, not conducive to environmental protection, and low efficiency, researchers have improved the performance and formula of styrene composite polymerization inhibitor

Method used

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  • Refining method of styrene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1 Preparation of catalyst

[0027] Weigh according to mass ratio: 10% ferric oxide, 15% potassium chromate, 2.4% calcium oxide, 12% zinc oxide, 6.2% aluminum oxide, and mix evenly to obtain a finished catalyst.

[0028] 2 catalytic reaction

[0029] Add above-mentioned catalyst in the crude product of styrene that contains ethylbenzene, the ratio of its addition is 100mg / l; Control reaction temperature is 550 ℃, reaction system pressure 0.7 atmospheric pressure, pass into reaction polymerization inhibitor in reaction system simultaneously, with To avoid self-polymerization of styrene monomers, the polymerization inhibitor is hydrogen peroxide vapor, and the amount of hydrogen peroxide vapor introduced is 2 / 3 of the volume of the reaction vessel.

[0030] (c) Sampling and testing the content of ethylbenzene in the styrene product obtained from the reaction. When the content of ethylbenzene is less than 0.1%, stop the reaction and filter to remove excess catalyst.

[00...

Embodiment 2

[0049] On the basis of Example 1, the iron-zinc catalytic hydrogenation system also includes 2.5% chromium oxide.

[0050] Its ethylbenzene conversion rate is 90%

Embodiment 3

[0051] Embodiment 3 reduction system comparison

[0052] Adopt the reducing system and step parameter in embodiment 1, embodiment 2, only adjust temperature.

[0053] The optimized reaction temperature is 560°C, 570°C, and 580°C respectively, and the conversion rate of ethylbenzene is investigated

[0054] temperature (°C) 560, conversion rate of ethylbenzene 570, conversion rate of ethylbenzene 580, conversion rate of ethylbenzene Embodiment 1 reaction system of the present invention 80 83 75 Embodiment 2 reaction system of the present invention 85 92 80

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Abstract

The invention relates to the field of petroleum, in particular relates to a preparation method of styrene and more particularly relates to a refining method of styrene applied to anti-aging agents. The refining method is low in cost and is quick and effective. By adopting the refining method, the purchased styrene commodity can be further refined and purified before production of the anti-aging agents, thus ensuring the quality of the anti-aging agents; and the low-toxicity, environment-friendly and efficient styrene refining effect is achieved by using hydrogen peroxide steam as a polymerization inhibitor.

Description

technical field [0001] The invention relates to a petroleum field, in particular to a method for preparing styrene, and more specifically to a method for refining styrene used in antioxidants. Background technique [0002] Styrene monomer is an important chemical raw material. The main production method is to prepare ethylbenzene by reacting benzene with ethylene, and then dehydrogenate ethylbenzene to produce styrene. In the refining process of styrene production, the separation of ethylbenzene and styrene is the most critical step. Since the boiling points of ethylbenzene and styrene at normal pressure are 136.1°C and 145.1°C respectively, the difference between the two is only 9°C, so it is difficult to separate them. [0003] The current common separation method is to separate styrene and ethylbenzene by means of a rectification tower, using temperature and pressure controls. [0004] Anti-aging agent refers to the compounding agent that can prevent or inhibit fac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/46C07C7/148C07C7/20
Inventor 达力达兴蒋超
Owner NANTONG HONGTU RUBBER & PLASTIC
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