Method for separating benzene and toluene from hydrocarbon mixture

A hydrocarbon mixture and toluene technology, applied in the chemical industry, can solve problems such as complex processes and high energy consumption, and achieve the effects of simple process flow, convenient operation, and investment cost savings

Inactive Publication Date: 2013-02-27
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a method for separating benzene and toluene from hydrocarbon mixtures by using a dividing wall extractive distillation tower. The problem to be solved is the complex flow process and the existing two-tower aromatics separation process of a conventional extractive distillation tower and a solvent recovery tower. high energy consumption

Method used

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  • Method for separating benzene and toluene from hydrocarbon mixture
  • Method for separating benzene and toluene from hydrocarbon mixture
  • Method for separating benzene and toluene from hydrocarbon mixture

Examples

Experimental program
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Effect test

Embodiment 1

[0017] combine figure 1 As shown, a dividing wall extractive distillation column is used to separate the mixed aromatics of benzene and toluene in the hydrocarbon mixture, packing is installed in the column, and the theoretical plate number of the dividing wall extractive distillation column is 30 plates. The hydrocarbon mixture enters the feed side A of the tower from the hydrocarbon mixture feed port 2 at 100 kmol / hr, and the feed temperature is 95°C; the extractant mainly composed of sulfolane enters the tower from the extractant feed port 1 at 110 kmol / hr Feed side A, feed temperature 90°C. The raw material feed position is the 10th plate and the solvent feed position is the 2nd plate. The solvent ratio is 1.1, the reflux ratio is 0.5, the top pressure of the dividing wall extractive distillation column is 0.1Mpa, the top temperature is 85.0°C, and the bottom temperature is 286°C. Raw materials and extractant are mixed in zone A and the separation of aromatics and non-a...

Embodiment 2

[0019] combine figure 1 As shown, a dividing wall extractive distillation column is used to separate the mixed aromatics of benzene and toluene in the hydrocarbon mixture. Packing is installed in the column, and the theoretical plate number of the column is 29 plates. The raw material enters the feed side A of the tower from the hydrocarbon mixture feed port 2 at 100 kmol / hr, and the feed temperature is 90°C; the extraction agent mainly sulfolane enters the tower from the extractant feed port 1 at 150 kmol / hr. Side A, feed temperature 95°C. The raw material feed position is the 14th plate and the solvent feed position is the 2nd plate. The dividing wall extractive distillation column is operated under normal pressure, the solvent ratio is 1.5, the reflux ratio is 0.9, the temperature at the top of the column is 87.9°C, and the temperature at the bottom of the column is 287.8°C. Raw materials and extractant are mixed in zone A and the separation of aromatics and non-aromatic...

Embodiment 3

[0021] combine figure 1 As shown, a dividing wall extractive distillation column is used to separate the mixed aromatics of benzene and toluene in the hydrocarbon mixture. Packing is installed in the column, and the theoretical plate number of the column is 29 plates. The raw material enters the feed side A of the tower from the hydrocarbon mixture feed port 2 at 100 kmol / hr, and the feed temperature is 90°C; the extraction agent mainly sulfolane enters the tower from the extractant feed port 1 at 200 kmol / hr. Side A, feed temperature 95°C. The raw material feed position is the 12th plate and the solvent feed position is the 2nd plate. The dividing wall extractive distillation column operates under reduced pressure, the top pressure is 0.04Mpa, the solvent ratio is 2, the reflux ratio is 1.5, the top temperature is 58.4°C, and the bottom temperature is 248.6°C. Raw materials and extractant are mixed in zone A and the separation of aromatics and non-aromatics is completed. A...

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Abstract

The present invention discloses a method for separating benzene and toluene from a hydrocarbon mixture, and belongs to the technical field of chemical industry. According to the method, the middle portion of a rectification tower for separation of non-aromatic hydrocarbon, benzene and toluene is provided with a vertical wall, the upper portion and the lower portion of the separation wall do not contact the top and the bottom of the tower, the upper portion on a benzene and toluene outlet side of the separation wall is sealed, and is not connected with the top space, the tower is divided into three regions such as A, B and C through the separation wall, non-aromatic hydrocarbons are recovered from the top of the region A, benzene and toluene are recovered from the region B side, the region C is a public stripping section, and column plates or fillers are arranged inside the three regions. According to the present invention, material feeding and side line recovery are separated through the separation wall, and high purity components are respectively obtained from three positions such as tower top, side line recovery and tower kettle of the separation wall extraction rectification tower, wherein the product purity can be more than 99.7%, and energy can be saved by more than 20% compared with the conventional process, such that the process is simple, operation is convenient, investment on one tower is saved, and cost can be significantly reduced.

Description

technical field [0001] The invention relates to a method for separating benzene and toluene from hydrocarbon mixtures by using a partition wall extractive distillation tower, which belongs to the technical field of chemical industry. Background technique [0002] Aromatics are important petrochemical raw materials, among which benzene, toluene and xylene are the most important. The source of aromatics is mainly from catalytic reforming to generate oil or cracking hydrogenated gasoline. The methods for separating aromatics mainly include liquid-liquid extraction and extractive distillation (extractive distillation). Different production requirements determine the use of different technological processes. Liquid-liquid extraction is often used to process raw materials with an aromatics content of less than 70%, and when the aromatics content is greater than 70%, it is necessary to mix non-aromatic products with the raw material to reduce the aromatics content of the extracti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/08C07C15/04C07C15/06
Inventor 叶青裘兆蓉熊晓娟秦继伟
Owner CHANGZHOU UNIV
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