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Distillation method for separating ethylbenzene and vinyl benzene-containing flow

A technology of styrene and dividing wall rectification tower, which is applied in the fields of fractionation, distillation purification/separation, organic chemistry, etc., can solve the problems of large loss of styrene, complicated rectification process, and low purity of ethylbenzene, so as to save investment, The effect of reducing the heat load of the tower kettle and improving the purity

Active Publication Date: 2012-01-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the styrene rectification process existing in the prior art is complex, the investment is large, the energy consumption is high, the purity of ethylbenzene is low, and the problem of styrene loss is large. Process for rectification of benzene and styrene streams

Method used

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  • Distillation method for separating ethylbenzene and vinyl benzene-containing flow
  • Distillation method for separating ethylbenzene and vinyl benzene-containing flow
  • Distillation method for separating ethylbenzene and vinyl benzene-containing flow

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Embodiment 1

[0029] Attached figure 2 The flow shown is based on a device with a production capacity of 150,000 tons of styrene per year, and the materials whose weight percentage composition is shown in Table 1 are separated. There are 120 theoretical plates in the dividing wall rectification column, 65 theoretical plates on both sides of the dividing plate in the dividing wall section, 10 theoretical stages in the separating section under the dividing plate, the operating pressure is 12KPa, and the top reflux ratio is 200. The separation results are listed in Table 3.

Embodiment 2

[0031] Attached figure 2 The flow process shown, other conditions are the same as embodiment 1, and the number of theoretical plates, operating pressure and reflux ratio on both sides of the dividing plate of the dividing wall rectification column are changed. The number of theoretical plates on both sides of the partition is increased to 70, the upper and lower separation sections of the partition each have 40 theoretical stages, the operating pressure is 5KPa and the reflux ratio is 138. For ease of comparison, the separation results are also listed in Table 3.

Embodiment 3

[0033] Attached figure 2 The flow process shown, other conditions are the same as embodiment 2, and the theoretical stages and operating pressure of the dividing wall rectification column are changed. The total number of theoretical stages of the dividing wall column becomes 150, and the operating pressure becomes 50KPa. For the convenience of comparison, the separation results are also listed in Table 3.

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Abstract

The invention relates to a rectification method used for separating phenylethane and styrene material flows, which mainly solves the technical problems of long flow, large investment, high energy consumption, large styrene loss and low purity of the phenylethane of rectification separating process in the prior process of styrene production. The technical proposal of the method well solves the problems by adopting the following steps: mixture containing phenylethane and styrene as a raw material enters one side of a bulkhead section of a bulkhead rectifying tower first; styrene material flow Iis obtained on the other side of the bulkhead section through separation, coke tar and other heavy compositions are obtained on the bottom of a stripping section of the bulkhead rectifying tower, toluene, benzene and other light composition material flow II is obtained on the top of a rectifying section of the bulkhead rectifying tower; and a phenylethane material flow III is extracted from a side line of the rectifying section between the bulkhead section and the tower top. The method can be used in industrial production of producing the styrene by dehydrogenating the phenylethane.

Description

technical field [0001] The invention relates to a rectification method for separating ethylbenzene and styrene-containing streams, in particular to a rectification for simultaneously separating and refining ethylbenzene and styrene from streams containing ethylbenzene and styrene and saving investment and energy method. Background technique [0002] Styrene is one of the most important olefins, and 99% of styrene is obtained through the production process of ethylbenzene dehydrogenation. The process technologies for producing styrene from ethylbenzene dehydrogenation mainly include adiabatic dehydrogenation process, isothermal dehydrogenation process and dehydrogenation selective oxidation process. The most mature and widely used one is the negative pressure adiabatic dehydrogenation process. The energy consumption of the styrene production process is mainly concentrated in the reaction unit, rectification unit and public works part (mainly the energy consumption of coolin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/073C07C15/46C07C7/04B01D3/14
Inventor 肖剑钟禄平卢咏琰郭艳姿
Owner CHINA PETROLEUM & CHEM CORP