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Method and apparatus for extracting, rectifying and separating propane and propylene by separated wall tower

A technology of extractive rectification and dividing wall column, which is applied in the field of separating wall column extractive rectification and separation of propane and propylene

Inactive Publication Date: 2007-09-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At home and abroad, there has been no new process report on the separation of propylene and propane by extractive distillation using a dividing wall column

Method used

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  • Method and apparatus for extracting, rectifying and separating propane and propylene by separated wall tower

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Embodiment 1

[0032] Example 1: Extraction and rectification of propylene and propane using a four-tower process. The process conditions are as follows: the processing capacity is 15000t / a, the propylene content in the raw material is 70% (mol%), the operating pressure is 1.72Mpa, and the converted molar flow rate is 48.905Kmol / hr. The extractant is aqueous acetonitrile with a water content of 40% (mol%). The process parameters of each column are shown in Table 1. The separation result is: the purity of propylene is 99.3% (mol%), and the recovery rate is 93%. A total of 90 theoretical boards are required for the four-tower process. The process parameters are shown in Table 1.

[0033] project

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Abstract

An apparatus for separating propane from propene by extracting-rectifying in a divided wall column (DWC) in which the water contained acetonitrile is used as the extractant is disclosed. Said DWC has a vertical bulkhead to divide it into three regions: the region A for extracting rectifying of propene and propane, the region B for separating propane from propene, and the region C as common desorption region. Its separation method is also disclosed.

Description

technical field [0001] The invention relates to a chemical separation and extraction equipment, in particular to a method for extracting and rectifying separation of propane and propylene in a dividing wall tower and its device, which can realize the extraction and rectification of propylene and propane and the recovery of solvent in the dividing wall tower Completed at the same time. Background technique [0002] When separating propane and propylene mixtures, it is usually divided into three methods: low-pressure rectification, high-pressure rectification and low-pressure heat pump rectification according to different operating pressures. [0003] In the high-pressure method, since the temperature at the top of the tower is higher than 40°C, it can be cooled with cooling water to generate reflux, and the tower kettle can be heated with low-pressure steam or hot water, and the equipment is simple. However, due to the low relative volatility between the two components, the ...

Claims

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Application Information

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IPC IPC(8): C07C7/08C07C11/06C07C9/08B01D3/40
Inventor 裘兆蓉叶青承民联陈红梅夏珊珊钱春健
Owner CHINA PETROLEUM & CHEM CORP
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