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Method for extracting and rectifying separation of alkanes, olefins and aromatics from hydrocarbon mixtures

A technology for hydrocarbon mixture and extractive rectification, which is applied in the field of extractive distillation and separation of hydrocarbons, can solve the problems of inability to separate high value-added products of olefins and alkanes, etc., and achieve the effects of improving economic benefits, cheap and simple raw materials, and simple process flow

Active Publication Date: 2015-09-30
TIANJIN HAOYONG CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for extracting and rectifying separation of alkanes, olefins and aromatics from hydrocarbon mixtures. In the second extraction and rectification tower, the separation of olefins and alkanes is realized under the action of the extractant, which overcomes the problem that only aromatics and non-aromatics can be obtained through extraction and rectification separation in the prior art, and it cannot achieve a high degree of olefins and alkanes in non-aromatics. Further separation of value-added products, so that these high value-added products of olefins and alkanes cannot be utilized

Method used

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  • Method for extracting and rectifying separation of alkanes, olefins and aromatics from hydrocarbon mixtures

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Embodiment 1

[0032] The equipment and technological process used in the present embodiment are all above-mentioned figure 1 In the shown embodiment, the first extractive distillation column 2 used is a plate column, and its theoretical plate number is 40 layers, the operating pressure is 0.15MPa, the extractant feed temperature is 100°C, and the tower top temperature is 110°C, The temperature at the bottom of the tower is 165°C, and the reflux ratio at the top of the tower is 0.5; the second extractive distillation tower 6 is a plate tower with a theoretical plate number of 35 layers, an operating pressure of 0.16MPa, and an extraction agent feed temperature of 95°C. The top temperature is 108°C, the tower bottom temperature is 160°C, and the top reflux ratio is 0.6; the first extractant recovery tower 15 is a packed tower with 15 theoretical plates, the operating pressure is 0.045MPa, and the tower top temperature is 68°C , the temperature at the bottom of the tower is 172°C, the reflux r...

Embodiment 2

[0043] The equipment and technological process used in the present embodiment are all above-mentioned figure 1 The embodiment shown, wherein the first extractive distillation column 2 used is a packed column, its theoretical plate number is 10 layers, the operating pressure is 0.1MPa, the extractant feed temperature is 40°C, and the tower top temperature is 50°C, The temperature at the bottom of the tower is 140°C, and the reflux ratio at the top of the tower is 0.1; the second extractive distillation tower 6 is a packed tower with 50 theoretical plates, the operating pressure is 0.7MPa, and the feed temperature of the extractant is 100°C. The top temperature is 120°C, the tower bottom temperature is 175°C, and the top reflux ratio is 0.2; the first extraction agent recovery tower 15 is a plate tower with 5 theoretical plates, the operating pressure is 0.01MPa, and the tower top temperature is 45°C , the temperature at the bottom of the tower is 110°C, and the reflux ratio at ...

Embodiment 3

[0054] The equipment and technological process used in the present embodiment are all above-mentioned figure 1 In the shown embodiment, the first extractive distillation column 2 used is a composite column of packing and trays, the number of theoretical trays is 50 layers, the operating pressure is 0.5MPa, and the extraction agent feed temperature is 130°C. The temperature is 140°C, the temperature at the bottom of the tower is 180°C, and the reflux ratio at the top of the tower is 1.0; the second extractive distillation column 6 is a tray column with 10 theoretical plates, the operating pressure is 0.15MPa, and the extraction agent feed temperature is 40°C, the temperature at the top of the tower is 45°C, the temperature at the bottom of the tower is 120°C, and the reflux ratio at the top of the tower is 2.0; the first extraction agent recovery tower 15 is a packed tower, the number of theoretical plates is 20 layers, and the operating pressure is 0.3MPa. The temperature at t...

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Abstract

The invention discloses a method for extracting, rectifying and separating alkane, olefin and arene from a hydrocarbon mixture, and relates to a method for extracting, rectifying and separating hydrocarbons. The method comprises the following steps: extracting and rectifying the hydrocarbon mixture by an extracting agent inside a first extracting and rectifying tower; separating into arene and a non-aromatic mixture containing alkane and olefin; separating the alkane from olefin in the non-aromatic mixture containing alkane and olefin under the action of the extracting agent in a second extracting and rectifying tower; taking out an alkane product from a reflux pump of the second extracting and rectifying tower, taking out an olefin product from the reflux pump of a primary recycling tower, and obtaining an arene mixture product from the top of a first extracting agent recovery tower, and recovering the extracting agent to recycle. By adopting the method disclosed by the invention, the defects that only can aromatic and non-aromatic products be obtained by extracting, rectifying and separating in the prior art, and the olefin and alkane high-value-added products in the non-aromatic product cannot be further separated to cause that the olefin and alkane high-value-added products cannot be utilized in the prior art are overcome.

Description

technical field [0001] The technical solution of the present invention relates to a method for extraction, distillation and separation of hydrocarbons, specifically a method for extracting and rectifying separation of alkanes, olefins and aromatics from hydrocarbon mixtures. Background technique [0002] At present, there are two main methods for separating aromatics and non-aromatics from catalytic cracking FCC naphtha or pyrolysis hydrogenated gasoline, namely liquid-liquid extraction and extractive distillation. Solubility and volatility are achieved. Compared with the liquid-liquid extraction method, the extractive distillation method has many advantages such as short process, simple operation, less equipment and low energy consumption. The most promising technology for industrialization of non-aromatic hydrocarbons. [0003] According to different extraction agents and extractive distillation conditions, the existing technology has developed many processes for extract...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/08
Inventor 吕建华刘继东
Owner TIANJIN HAOYONG CHEM TECH
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