Refining method of styrene

A purification method and technology of styrene, applied in chemical instruments and methods, purification/separation of hydrocarbons, purification/separation of chemical changes, etc., can solve the problems of toxicity, unfavorable environmental protection, low efficiency, etc., to save costs and solve the problem of styrene Aggregates, avoids highly toxic effects

Active Publication Date: 2013-09-25
RUNTAI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 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
  • Refining method of styrene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1 Preparation of catalyst

[0032] Weigh according to mass ratio: 15% iron molybdate, 20% potassium chromate, 2.8% calcium oxide, 15% zinc phosphate, 6.2% aluminum oxide, and mix uniformly to obtain a finished catalyst.

[0033] 2 catalytic reaction

[0034] Add above-mentioned catalyzer in the crude product of styrene containing ethylbenzene, the ratio of its addition is 100mg / l; Control reaction temperature is 570 ℃, reaction system pressure 0.8 atmospheric pressure, reaction feeds 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.

[0035] (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.

...

Embodiment 2

[0053] Embodiment 2 reduction system comparison

[0054] Using the reduction system and step parameters of Example 1, only the temperature was adjusted.

[0055] The optimized reaction temperatures are 560°C, 570°C, 572°C, 575°C, and 580°C respectively, and the conversion rate of ethylbenzene is investigated

[0056] temperature (°C) 560 570 572 575 580 Conversion rate of ethylbenzene 80 83 85 90 75

Embodiment 3

[0058] Using the reduction system and step parameters in Example 1, only the reaction atmospheric pressure was adjusted.

[0059] System pressure is less than 0.5, 0.6, 0.8 atmospheric pressure.

[0060] System pressure (atmospheric pressure) 0.5 0.6 0.8 Conversion rate of ethylbenzene 70 73 90

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Abstract

The invention relates to a styrene preparation method and especially relates to a refining method of styrene used in an antiager and belongs to the field of petroleum. The refining method of styrene is a low-cost, fast and effective styrene refining method. Through the refining method, in an early-stage of antiager production, a bought styrene product is further refined so that antiager quality is guaranteed. Through utilization of hydrogen peroxide vapor as a polymerization inhibitor, low-toxicity, environmentally-friendly and high-efficiency styrene refining effects are obtained.

Description

[0001] technical field [0002] 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. [0003] Background technique [0004] 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. [0005] The current common separation method is to separate styrene and ethylbenzene by means of a rectification tower, using temperature and pressure controls. [0006] Anti-aging agent refers to the compounding agent that can pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/46C07C7/20C07C7/148
Inventor 达力达兴蒋超
Owner RUNTAI CHEM CO LTD
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