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Method for producing styrene by catalytic dehydrogenation

A technology for catalytic dehydrogenation of ethylbenzene and styrene, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc. efficiency and other issues to achieve the effect of high selectivity and improved conversion of ethylbenzene

Inactive Publication Date: 2005-03-30
CHINA PETROLEUM & CHEM CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the problem that the adiabatic bed reactor is used in the ethylbenzene dehydrogenation reaction in the previous literature, and the temperature of the catalyst bed changes too much along the flow direction of the reaction medium, which affects the performance of the catalyst, the reaction conversion rate and the reaction yield. , and provide a new method of catalytic dehydrogenation of ethylbenzene to produce styrene

Method used

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  • Method for producing styrene by catalytic dehydrogenation
  • Method for producing styrene by catalytic dehydrogenation
  • Method for producing styrene by catalytic dehydrogenation

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The catalytic dehydrogenation of ethylbenzene / steam mixture is carried out with a set of equipment, and its production block diagram is shown as Figure 4 . Both the first reactor and the second reactor use figure 1 or figure 2 In the reactor, the catalyst used is iron-potassium-cerium-molybdenum system. The diameter of the distribution cylinder in the reactor is 1150 mm, the radial thickness of the bed is 600 mm, and the total static height is 5500 mm. The reactor is in the form of an axial radial reactor with many small holes on the upper cover. The heating tube is an inverted U-shaped tube that penetrates into the entire catalyst bed. The number of heating tubes in each reactor is 100, which are evenly distributed in the radial direction. On the section, the heat carrier passes through the inverted U-shaped tube. The temperature of the reaction material entering the first reactor is 620°C, the pressure is 58KPa, the total flow rate is 32257.2 kg / hour, the temper...

Embodiment 2

[0044] According to the conditions and steps of Example 1, only the type of heating tube is changed to double casing, the number of double casing is 500, the outlet temperature of the first reactor is uniform at 550.9°C, and the reaction result is: the conversion rate of ethylbenzene is 48.11%. , the styrene selectivity was 96.0%, and the styrene yield was 46.2%. The outlet temperature of the second reactor was uniform at 585.5° C., and the conversion rate of ethylbenzene was 49.8%.

Embodiment 3

[0046] According to the conditions and steps of Example 1, just change the type of heating tubes to 300 inverted U-shaped tubes and double sleeve tubes, the outlet temperature of the first reactor is nearly uniform at 545.3°C, and the reaction result is: the conversion rate of ethylbenzene is 44.15%. , the styrene selectivity was 97.2%, and the styrene yield was 42.9%. The outlet temperature of the second reactor was nearly uniform at 581.3°C, and the conversion rate of ethylbenzene was 47.5%.

[0047] components

[0048] components

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Abstract

The present invention relates to a method for producing styrene by catalytic dehydrogenation of ethylbenzene, the first stage of the steam is used for heating reactant effluent, then it is used as diluting agent of ethylbenzene. Said invented method is aimed at mainly resolving the problem of that in the existent production method the excessive change of catalyst bed layer temperature in the heat-insulating bed reactor along the flowing direction of the reaction medium can affect the catalyst performance, reaction conversion rate and reaction yield. Said invention adopts the technical scheme of adding at least one heating pipe in reactor bed layer of fixed bed so as to better resolve said problem.

Description

technical field [0001] The invention relates to a method for producing styrene by catalytic dehydrogenation of ethylbenzene. Background technique [0002] Styrene is widely used as a raw material for the production of various resins, plastics and elastomers, and its wide range of applications is mainly due to the ease with which styrene can be polymerized (for example, to form polystyrene) or copolymerized (for example, with butadiene to form Production of rubber) adaptability. [0003] The production of styrene is well known in terms of the dehydrogenation process and the various catalysts used in the process. The main research objective at present is to improve the efficiency of this process. Especially known is the dehydrogenation process of ethylbenzene, wherein the dehydrogenation is carried out in a set comprising at least two dehydrogenation reactors in series and placed between the reactors, wherein the reaction effluent is heat excha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/327C07C15/46
Inventor 朱子彬毛连生徐志刚朱冬茂朱中南刘玉兰张成芳顾雄毅
Owner CHINA PETROLEUM & CHEM CORP
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