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Method for saving energy in rectification of styrene

A styrene and dividing wall rectification column technology, which is applied in chemical instruments and methods, distillation purification/separation, hydrocarbons and other directions, can solve the problems of high energy consumption of styrene rectification and large loss of styrene, and reduce the Loss, effect of good technical effect

Active Publication Date: 2012-10-10
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the high energy consumption of styrene rectification and the large loss of styrene in the prior art, and a new energy-saving method for styrene rectification is provided

Method used

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  • Method for saving energy in rectification of styrene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 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. The dividing wall rectification column adopted has 120 theoretical plates, and there are 65 theoretical plates on both sides of the partition of the dividing wall. There are 10 theoretical stages in the separation section under the dividing wall. is 6.5. The results are listed in Table 3.

Embodiment 2

[0033] Attached figure 2 The flow process shown, other conditions are the same as in Example 1, the total number of theoretical plates of the dividing wall rectification column and the number of theoretical plates on both sides of the partition of the dividing wall section, the operating pressure and the reflux ratio are changed. The total number of theoretical plates is increased to 150, the number of theoretical plates on both sides of the dividing wall section is increased to 70, the upper and lower separation sections of the dividing plate have 40 theoretical stages, and the operating pressure is 50KPa and the reflux ratio is 13. For comparison, the results are also listed in Table 3.

Embodiment 3

[0035] with attached figure 2 Shown flow process, other conditions are the same as embodiment 2, change the reflux ratio and operating pressure of dividing wall rectification column. The reflux ratio was reduced to 6, and the operating pressure was reduced to 5KPa. For the convenience of comparison, the results are also listed in Table 3.

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Abstract

The invention relates to a method for saving energy in rectification of styrene. The method aims to solve the technical problems existing in the prior production of the styrene that the rectification of styrene is big in investment and high in energy consumption, and that the polymerization losses caused when the styrene is repeatedly heated are huge. The method comprise the following steps of: taking a mixture of ethylbenzene and styrene as a raw material; allowing the raw material to enter one side of a bulkhead segment of a bulkhead rectification tower for separation to obtain a styrene material flow I on the other side of the bulkhead segment, obtain heavy components such as tar and the like on the bottom part of a separation segment below the bulkhead segment of the bulkhead rectification tower and obtain the ethylbenzene containing the material flow II on the top part of the separation segment above the bulkhead segment of the bulkhead rectification tower; and allowing the material flow II to enter the middle part of an ethylbenzene recycling tower for separation to obtain the ethylbenzene on the bottom part of the ethylbenzene recycling tower and obtain light components on the top part of the ethylbenzene recycling tower. The technical scheme solves the technical problems. The method can be applied to separation and purification of the styrene in a process of producing the styrene by ethylbenzene dehydrogenation.

Description

technical field [0001] The invention relates to an energy-saving method for styrene rectification, in particular to a rectification method for separating and refining ethylbenzene and styrene from streams containing ethylbenzene and styrene and saving investment and energy. 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 cooling water and air cooler). The dehydrogenation re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/46C07C7/04C07C5/327
Inventor 肖剑钟禄平郭艳姿卢咏琰
Owner CHINA PETROLEUM & CHEM CORP