A method for extracting and rectifying separation of tert-amyl alcohol and benzene mixture

A technology of extractive distillation and benzene mixture, which is applied in chemical instruments and methods, distillation purification/separation, preparation of organic compounds, etc., can solve the problems of high operating cost, large solvent, and low separation efficiency, and achieve recycling and utilization , change relative volatility, high separation efficiency

Active Publication Date: 2017-09-01
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] Chinese patent CN102795957A discloses a method for extracting and rectifying the separation of m-methylethylbenzene and p-methylethylbenzene. The extraction and rectification solvent is a nitrogen-containing compound, but the solvent has a low separation efficiency for m-methylethylbenzene and p-methylethylbenzene, and the solvent ratio is large. , the amount of solvent is large, the energy consumption is high, and the purity of the separated product is low
[0006] Chinese patent CN103351276A discloses a method for the separation of ethanol-benzene azeotropic mixture by batch extraction and rectification. Although single-column operation is realized by using batch extraction and rectification, the operation process is complicated and continuous operation cannot be realized, and the liquid in the receiving tank of the transition section needs further treatment , time-consuming, labor-intensive, low efficiency, high operating cost

Method used

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  • A method for extracting and rectifying separation of tert-amyl alcohol and benzene mixture
  • A method for extracting and rectifying separation of tert-amyl alcohol and benzene mixture
  • A method for extracting and rectifying separation of tert-amyl alcohol and benzene mixture

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Experimental program
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Effect test

Embodiment 1

[0025] In an extractive distillation column with an internal diameter of 1000mm and 50 trays, the mixture of tert-amyl alcohol and benzene (15.0% and 85.0% in mass content) enters the tower at the 41st tray at a flow rate of 1000kg / h. The extractant monoethanolamine enters the tower from the 32nd plate at a flow rate of 500kg / h (that is, the solvent ratio is 0.50), and the control reflux ratio is 2.0, and benzene is extracted from the top of the tower at a flow rate of 855kg / h, with a purity of 99.19 %, monoethanolamine and tert-amyl alcohol enter the extractant recovery tower (750mm inner diameter, 17 trays) at the 7th tray after being extracted from the bottom of the tower, and the control reflux ratio is 1.5, and tert-amyl alcohol is 148kg / The flow of h is extracted from the top of the tower with a purity of 99.18%, and the extractant monoethanolamine is recycled from the bottom of the tower.

[0026] Table 1 Rectification system process operating parameters

[0027]

Embodiment 2

[0029] In an extractive distillation column with 55 theoretical plates of 1200mm inner diameter, tert-amyl alcohol and benzene mixture (mass content is 20% and 80% respectively) enters this column at the 45th theoretical plate with a flow rate of 1000kg / h, The extraction agent diethanolamine enters the tower from the 38th theoretical plate at a flow rate of 600kg / h (that is, the solvent ratio is 0.60), and the control reflux ratio is 2.5, and benzene is withdrawn from the top of the tower at a flow rate of 818g / h with a purity of 99.00 %, diethanolamine and tert-amyl alcohol enter the extraction agent recovery tower (750mm inner diameter, 14 theoretical plates) at the 6th theoretical plate after being extracted from the bottom of the tower, and the control reflux ratio is 0.7, and tert-amyl alcohol is 199kg / The flow of h is extracted from the top of the tower with a purity of 99.20%, and the extractant diethanolamine is recycled from the bottom of the tower.

[0030] Table 2....

Embodiment 3

[0033] In an extractive distillation column with 52 theoretical plates of 1100mm inner diameter, tert-amyl alcohol and benzene mixture (mass content is 35% and 65%) enters this column at the 42nd theoretical plate with a flow rate of 1000kg / h, The extraction agent dimethylethanolamine enters the tower from the 35th theoretical plate at a flow rate of 550kg / h (that is, the solvent ratio is 0.55), and the control reflux ratio is 3.0, and benzene is extracted from the top of the tower with a flow rate of 657g / h. It is 99.06%. Dimethylethanolamine and tert-amyl alcohol enter the extraction agent recovery tower (inner diameter 750mm, equipped with 16 theoretical plates) on the 8th theoretical plate after being extracted from the bottom of the tower. The control reflux ratio is 1.2, and the tert-amyl alcohol Alcohol is extracted from the top of the tower with a flow rate of 345kg / h, and the purity is 99.16%. The extractant dimethylethanolamine is recycled after being extracted from t...

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Abstract

The invention discloses a method of separating a mixture of tert-amyl alcohol and benzene by extractive distillation. According to the method, phenyl-ethanolamine compounds are taken as extraction agents, and the extraction agents are introduced to the upper part of an extractive distillation tower to fully contact with the mixture of tert-amyl alcohol and benzene introduced from the middle of the tower in the tower, then benzene is extracted from the top of the extractive distillation tower, and the extraction agents and tert-amyl alcohol are extracted from the bottom of the extractive distillation tower to enter an extraction agent recovery tower. Effective separation of the extraction agents and the tert-amyl alcohol is carried out in the extraction agent recovery tower, and the tert-amyl alcohol is extracted from the top of the extraction agent recovery tower, and the extraction agents are extracted from the bottom of the extraction agent recovery tower to be recycled. The method has the advantages of low energy consumption, simple process, realization of cyclic recovery of the extraction agents, high purity of products after the separation and the like.

Description

technical field [0001] The invention belongs to the field of chemical separation and purification, and relates to a method for extracting and rectifying the separation of tert-amyl alcohol and benzene mixture. Background technique [0002] Tert-Amyl Alcohol is an important raw material for organic synthesis, which can be used for the production of new-type pesticides, pinacolone, triadimefon, triadimenol, seed protectant, etc., and can also be used for the synthesis of indenane musk, as well as the fineness of color film agent etc. It is also an excellent solvent, used as a solvent for detergents, medicines, pesticides, plastics and paints. Benzene is an important basic organic chemical raw material, an important raw material for synthetic dyes, medicines, pesticides, photographic films and petrochemical products, thinners for varnishes, nitrocellulose paints, paint removers, lubricating oils, greases, waxes, celluloid, Resin, artificial leather and other solvents. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/84C07C31/125C07C7/08C07C15/04
CPCC07C7/08C07C29/84C07C31/125C07C15/04
Inventor 王英龙卜光乐赵玉军曹玉娟梁石生
Owner QINGDAO UNIV OF SCI & TECH
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