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Extractive rectification method for separating tert-butanol and benzene mixture

A benzene mixture, extraction and rectification technology, applied in chemical instruments and methods, distillation purification/separation, preparation of organic compounds, etc., can solve the problems that have not been seen in the data, achieve change of relative volatility, high separation efficiency, and realize circulation The effect of recycling

Active Publication Date: 2015-11-04
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are many articles and patents on extractive distillation, but there is no publicly published information on extractive distillation and separation of tert-butanol-benzene azeotropic system

Method used

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  • Extractive rectification method for separating tert-butanol and benzene mixture
  • Extractive rectification method for separating tert-butanol and benzene mixture
  • Extractive rectification method for separating tert-butanol and benzene mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In an extractive distillation tower with an internal diameter of 360mm and 70 trays, tert-butanol and benzene mixture (mass content is 36.6% and 63.4%) enters the tower at the 52nd tray at a flow rate of 1000kg / h. The extractant monoethanolamine enters the tower from the 25th plate at a flow rate of 1800kg / h (that is, the solvent ratio is 1.8), and the control reflux ratio is 1.0, and benzene is extracted from the top of the tower at a flow rate of 659g / h, with a purity of 99.14 %, monoethanolamine and tert-butanol enter the extractant recovery tower (290mm inner diameter, equipped with 24 trays) at the 12th plate after being extracted from the bottom of the tower, and the control reflux ratio is 2.5, and tert-butanol is 344kg / The flow of h is extracted from the top of the tower with a purity of 99.13%, and the extractant monoethanolamine is recycled from the bottom of the tower.

[0019] Table 1 Rectification system process operating parameters

[0020]

Embodiment 2

[0022] In an extractive distillation tower with an internal diameter of 370mm and 70 trays, tert-butanol and benzene mixture (mass content is 36.6% and 63.4%) enters the tower at the 56th tray at a flow rate of 1000kg / h. The extraction agent diethanolamine enters the tower from the 30th plate at a flow rate of 2100kg / h (that is, the solvent ratio is 2.1), and the control reflux ratio is 2.0, and benzene is extracted from the top of the tower at a flow rate of 652kg / h, with a purity of 99.17 %, diethanolamine and tert-butanol enter the extractant recovery tower (250mm inner diameter, equipped with 24 trays) at the 8th tray after being withdrawn from the bottom of the tower, the control reflux ratio is 4.0, tert-butanol is 349kg / The flow of h is extracted from the top of the tower with a purity of 99.12%, and the extractant diethanolamine is recycled from the bottom of the tower.

[0023] Table 2. Distillation system process operating parameters

[0024]

Embodiment 3

[0026] In an extractive distillation tower with an internal diameter of 350 mm and 75 trays, the tert-butanol and benzene mixture (mass content is 36.6% and 63.4%) enters the tower at the 58th tray at a flow rate of 1000 kg / h. The extraction agent dimethylethanolamine enters the tower from the 26th tray with a flow rate of 2500kg / h (that is, the solvent ratio is 2.5), and the control reflux ratio is 3.0, and benzene is extracted from the top of the tower with a flow rate of 655kg / h. 99.15%, dimethylethanolamine and tert-butanol enter the extraction agent recovery tower (270mm inner diameter, equipped with 15 trays) at the 8th tray after being withdrawn from the bottom of the tower, and the control reflux ratio is 3.0, and the tert-butyl Alcohol is extracted from the top of the tower with a flow rate of 346kg / h, and the purity is 99.15%. The extractant dimethylethanolamine is recycled after being extracted from the bottom of the tower.

[0027] Table 3. Process operating parame...

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Abstract

The present invention discloses an extractive rectification method for separating a tert-butanol and benzene mixture. The method belongs to the technical field of chemical separation. The extraction agent that used in the method is an ethanol amine compound, and the to-be-separated tert-butanol and benzene mixture enters into an extractive rectification column with 65 to 80 column plates from column plates 48 to 65. An entrance position of the extraction agent is column plates 25 to 30, benzene is obtained from the top of the extractive rectification column, the extraction agent and tert-butanol are obtained from the bottom of the extractive rectification column and sent to an extraction agent recycling column. The extraction agent recycling column has 15 to 30 column plates and the feed entrance poisition is tower plates 7 to 15. Tert-butanol is obtained from the top of the extractive rectification column, the extraction agent is obtained from the bottom of the extractive rectification column for recycling. The present invention has the advantages that the method has low power consumption, and is simple in process, safe and environmentally friendly without protection so as to achieve clean production.

Description

technical field [0001] The invention belongs to the technical method of the chemical separation process, and relates to a method for extracting and rectifying the separation of the mixture of tert-butanol and benzene. Background technique [0002] Tert-butanol is an important raw material for organic synthesis, which can be used to produce methyl methacrylate, tert-butylphenol, tert-butylamine, medicines, spices, denatured alcohol, isobutylene, etc. It is also a good solvent and used as a detergent , pharmaceuticals, pesticides, solvents for 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. [0003] Tert-Butylbenzene is an intermediate in the synthesis of antiallergic drugs, A...

Claims

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Application Information

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IPC IPC(8): C07C15/04C07C7/08C07C31/12C07C29/84
Inventor 王英龙卜光乐朱兆友汝绍刚马艺心
Owner QINGDAO UNIV OF SCI & TECH