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Bulkhead type rectification column for separating materials containing ethylbenzene and vinyl benzene

A styrene and dividing wall technology, applied in fractionation, distillation purification/separation, organic chemistry, etc., can solve the problems of large number of distillation towers, large investment and high energy consumption, reduce the heat load of the tower and reduce the thermal load of the tower. effect, the effect of saving investment

Active Publication Date: 2009-05-13
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 in the existing styrene production process, there are many styrene rectification towers, large investment, high energy consumption, long heating time of styrene, serious polymerization loss, and low purity of recovered ethylbenzene , to provide a new dividing wall rectification column for the separation of materials containing ethylbenzene and styrene

Method used

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  • Bulkhead type rectification column for separating materials containing ethylbenzene and vinyl benzene
  • Bulkhead type rectification column for separating materials containing ethylbenzene and vinyl benzene
  • Bulkhead type rectification column for separating materials containing ethylbenzene and vinyl benzene

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Embodiment 1

[0032] use 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

[0034] use figure 2 In the flow shown, other conditions remain unchanged, and the number of theoretical plates, operating pressure and reflux ratio on both sides of the partition of the dividing wall rectification column are changed. The number of theoretical plates on both sides of the dividing wall section is increased to 70, 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

[0036] use figure 2 The flow process shown, other conditions are the same as embodiment 1, 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 bulkhead type rectifying tower used for separation material containing styrene and phenylethane , and mainly solves the technical problems of large number of styrene rectifying towers, large investment, high energy consumption, long heating time of the styrene and severe aggregation loss in the prior production process of the styrene. The bulkhead type rectifying tower well solves the technical problems through adopting the technical proposal that the bulkhead rectifying tower comprises a separation section under a bulkhead section, the bulkhead section and a separation section above the bulkhead section; a material inlet is positioned on one side of the bulkhead section; a material outlet for heavy compositions is arranged on the bottom of the separation section under the bulkhead section; the bulkhead section is provided with at least one outlet of product styrene; and the separation section above the bulkhead section is provided with at least one outlet of product phenylethane; the top of the separation section above the bulkhead section is also provided with an outlet for light compositions; the bulkhead section is provided with at least one clapboard to divide the bulkhead section into at least two zones along axial direction; and column plates or stuffing is arranged inside each zone. The bulkhead type rectifying tower solves the technical problems well and can be used in industrial production of producing the styrene by dehydrogenating the phenylethane.

Description

technical field [0001] The present invention relates to a kind of dividing wall type rectification tower that is used for separating ethylbenzene, styrene-containing material, especially relates to a kind of simultaneously separating ethylbenzene, styrene from the stream containing ethylbenzene and styrene and saving investment and Energy dividing wall distillation column. 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 publ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/073C07C15/46C07C7/04B01D3/14
Inventor 肖剑钟禄平郭艳姿卢咏琰张惠明
Owner CHINA PETROLEUM & CHEM CORP
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